h20-1 filtered gunsemanuals.nordson.com/adhesives/english_manuals/104525.pdf · use the following...

H20-1 Filtered Guns

Customer Product ManualPart 104525A02

NORDSON CORPORATION � DULUTH, GEORGIA � USAwww.nordson.com

� 2002 Nordson CorporationAll rights reserved

104525A02

Issued 3/0242-H20-MA-01

For CE Declaration, refer to melter manual.

Nordson Corporation welcomes requests for information, comments and inquiries about its products. Generalinformation about Nordson can be found on the Internet using the following address: http://www.nordson.com.

Address all correspondence to:

Nordson CorporationAttn: Customer Service11475 Lakefield Drive

Duluth, GA 30097

Notice

This is a Nordson Corporation publication which is protected by copyright. Original copyright 1986. No part of this document may be photocopied, reproduced, or translated to another language without the prior written

consent of Nordson Corporation. The information contained in this publication is subject to change without notice.

Trademarks

AccuJet, AquaGuard, Asymtek, Automove, Autotech, Blue Box, CF, CanWorks, Century, Clean Coat, CleanSleeve,CleanSpray, Compumelt, Control Coat, Cross-Cut, Cyclo-Kinetic, Dispensejet, DispenseMate, Durafiber, Durasystem,Easy Coat, Easymove Plus, Econo-Coat, EPREG, ETI, Excel 2000, Flex-O-Coat, FlexiCoat, Flexi-Spray, Flow Sentry,

Fluidmove, Fluidshooter, FoamMelt, FoamMix, Helix, Horizon, Hose Mole, Hot Shot, Hot Stitch, Isocoil, Isocore, Iso-Flo, JR,KB30, Little Squirt, Magnastatic, MEG, Meltex, MicroSet, Millenium, Mini Squirt, Moist-Cure, Mountaingate, MultiScan,

Nordson, OmniScan, Opticoat, Package of Values, PluraFoam, Porous Coat, PowderGrid, Powderware, Pro-Flo, ProLink,Pro-Meter, Pro-Stream, PRX, RBX, Ready Cost, Rhino, S. design stylized, Saturn, SC5, SCF, Select Charge, Select Coat,Select Cure, Shur-Lok, Slautterback, Smart-Coat, Spray Squirt, Spraymelt, Super Squirt, Sure-Bond, Sure Coat, System

Sentry, Tela-Therm, Trends, Tribomatic, UniScan, UpTime, Veritec, Versa-Coat, Versa-Screen, Versa-Spray, Watermark, andWhen you expect more. are registered trademarks – � – of Nordson Corporation.

ATS, Auto-Flo, AutoScan, BetterBook, Chameleon, CanNeck, Check Mate, CPX, Control Weave, Controlled Fiberization,EasyClean, Ebraid, Eclipse, Equi=Bead, Fillmaster, Gluie, Ink-Dot, Maxima, MicroFin, Minimeter, Multifil, OptiMix,

Pattern View, PluraMix, Primarc, Prism, Process Sentry, PurTech, Pulse Spray, Seal Sentry, Select Series, Sensomatic,Shaftshield, Spectral, Spectrum, Sure Brand, Swirl Coat, Vista, Walcom, and 2 Rings (Design)

are trademarks – � – of Nordson Corporation.

0 Nordson P&A Division

Atlanta, Georgia

H20-1 FILTERED GUNS

INTRODUCTION

The H20-1 filtered gun is equipped with a heated filter in the service block to reduce nozzle clogging. The filter is readily accessible and easily removable for servicing and cleaning. An H20-1 gun is available for each Nordson non-circulating applicator.

Each gun uses either a standard thermostat or an RTD/solid state temperature control depending on the applicator used. There are three optional adhesive inlets and three optional filter drain ports located on each side and on the back of each gun in order to ease installation and servicing. Response time and cycle rates are similar to the standard H20 Series guns as standard extrusion modules are used.

The following list shows the part number of the gun specified for use with each Nordson applicator.

P/N 815 162 H20-1 filtered gun for Model IV/V/VIII/IX/X/XI/XII/

P/N XIIA/XIII/XIV/XVIII

815 134 H20-1 filtered gun for applicators 2000 Series P/N 815 138 applicators H20-1 filtered gun for 2300/6000 Series applicators

SPECIFICATION SUMMARY

All specifications are the same as those for standard H20 Series guns (see Specification Summary under Section I of Manual 4205), with the following exception:

Gun heating method RTD/solid state temperature control (for gun used with 2300/6000 Series applicators)

Thermostatically controlled cartridge heater (for guns used with all other applicators)

lSSUE0 2/86

lITHO U.S.A.

SUPERSEDES @ NORDSON CORPORATION 1986

All Rights Reserved

(S)42.3.2 0 Nordson P&A Division

Atlanta, Georgia

DIMENSIONAL DRAWING

’ (38.1) ’

A

CLEARANCE REQUIRED FOR REMOVAL

OF FILTER

TECHNICAL PUB1 /CAT/ON

.96

(24.4)

0.50 DIA HOLES I

H20-1 Filtered Gun

INSTALLATION AND OPERATION

Installation, setup and initial operation of H20-1 filtered guns are the same as for standard H20 Series guns'. See instructions in Section II, tions,

Preparation for Use, and Section III, Operating Instruc- in Manual 42-5.

MAINTENANCE

Refer to Section IV in Manual 42-5 for general maintenance procedures.

ISSUED 2/8 6

LITHO U.S.A.

SUPERSEDES @ NORDSON CORPORATION 1986

All Rights Reserved


Atlanta, Georgia TECHNICAL PUBLICATION ( s )42 l 3 - 3

Filter Cleaning

Clean the adhesive filter once a week, unless operating experience indicates more or less frequent cleaning is required. A complete filter assembly is recommended as a spare for faster filter changes. The hot melt system must be at operating temperature before filter is removed for cleaning.

A

Wear safety glasses, safety gloves (P/N 902 514),

e and protective clothing to prevent injury from hot applicator parts, splashed hot melt adhesive material, and hot gun surfaces.

Use the following procedure to clean the adhesive filter.

1.

2.

Heat the system to application temperature.

Reduce pump air pressure to zero aft the regulator (on

3.

4.

5.

applicators with piston pumps or air motors on gear pumps).

Momentarily trigger gun to relieve trapped hydraulic pressure.

Open the drain valve in the gun over an open container.

Increase pump air pressure until adhesive material flows steadiy from the drain. Allow material to flow until it is free of contaminants.

6. Reduce pump air pressure to zero a't the regulator.

A Failure to relieve system pressure can result in + 0 c* serious burns when the filter assembly is removed

for cleaning.

7.

8.

Unscrew filter assembly and remove from service block.

Using Figure 1 as a guide, remove screw (A) from filter bung (B) and disassemble filter.

D B /

.’ / E

C A / /

Flg-ure 1 - Adhesive FiILter Assembly

A Do not heat Type R solvent above 475OF (245'C). A fire hazard exists if an open flame or unregulated heating device is used to heat Type R solvent. See Section 59-1 in Manual 42-18 for further details.

ISSUED 2/8 6

LITHO U.S.A,

SUPERSEDES G’ NORDSON CORPORATION 1986

All Rights Reserved

(S)42.3.4

9.

10.

11.

12.

13.

14.

15.

16.

17.


Atlanta, Georgia TECHNICAL PURL/CAT/ON

Several methods for cleaning a hot melt adhesive filter screen (C) may be used, depending on the type of hot melt adhesive material used in the system, as noted below:

a. Place the filter in a container of Type R solvent and heat above the melting temperature of the adhesive. Scrub the screen with a fine bristle brush.

Some solvents may not be compatible with the hot

0 melt adhesive material. Sludge formation can further compound the problem. Test the solvent with a small sample of adhesive before using the solvent in the system.

0 Do not use a metal brush to clean a filter screen. Damage may result to the screen preventing proper operation of the filter.

b. Screens may be heated with a flameless electric heat gun and wiped clean with a dry cloth.

C. Use an ultrasonic cleaner filled with solvent to clean filter components.

d. Use a chemical cleaner to clean the filter components.

Inspect the screen for damage.

NOTE: Any dents or breaks in th!e mesh indicate damage beyond repair. Replace with a new screen.

Slide screen (C) over core (D), as shown in Figure 1.

Insert screw (A) through core and tighten screw into filter bung (B).

Inspect O-ring for damage.

NOTE: Any indication of cuts, nicks, hardening, or other physical damage constitutes O-ring failure. O-ring.

Replace

Screw filter assembly into service block, finger tight only.

Increase pump air pressure and purge filter as in step 5,

Close service block drain valve.

Tighten filter snugly. Do not overtighten.

0 Ensure gun is at operating temperature before the filter is tightened. Cold material on filter service block walls can cause filter screen to

and/or

collapse if filter is tightened in a cold system.

ISSUED 2/8 6 SUPERSEDES

LITHO U.S.A. 62 NORDSON COfWORATION 1986

All Rights Reserved


Atlanta, Georgia TECHNICAL PUBLICATION ( s )42 0 3 l 5

ILLUSTRATED PARTS LISTS

INTRODUCTION

The Illustrated Parts Lists detail and illustrate the assemblies and components of the H20-1 filtered guns.

COLUMN IDENTIFICATION

Item Number Column

The Item Number column indicates the callout number in the associated figure. A dash in this column denotes that no callout has been made for that part.

Part Number Column

The Part Number column indicates the Nordson part number for the physical part or assembly. A dash in this column indicates a nonsaleable part or a nonsaleable subassembly of a saleable assembly.

Description Column

The Description column gives a short verbal description of the part.

Required Column

The Required column specifies the quantity of the part required per unit or assembly. A dash in this column indicates that no specific quantity is required. The term "Ref" in this column indicates the part or assembly has been included for reference only.

ISSUED 2/8 6

LITHO U.S.A.

SUPERSEDES GZ NORDSON CORPORATION 1986

All Rights Reserved

(S)42.3.6 Nordson ~n~~~:gia 0 I TECHNICAL PUBLICATION

9

\

21

\

/ 8

0 0 0

0

a

'6

21-

HEATER I

32,22

22,23

24

Figure 2 - H20-1 Filtered Gun with Thermostatically Controlled Cartridge Heater

ISSUED 2/8 6

LITHO U.S.A.

SUPERSEDES G NORDSON CORPORATION 1986

All Rights Reserved


Atlanta, Georgia TECHNICAL PUBLICATION ( s ) 42 .3 l 7

H20-1 Filtered Gun with Thermostatically Controlled Cartridge Heater

Item No. Part No* Description Reqtd

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

815 162

815 134

973 574

973-402 271 484 815 119 153 011 815 122 981 055 815 118

600 141 815 117 981 176 981 239 815 116 273 906 242 077 983 161 984 155 972 628 815 163 815 115 981 000 271 929 933 056

939-110

973 577

983-103 270 763

Gun, H20-1 W/Filter (for Model IV/V/ VIII/IX/X/XI/XII/XIIA applicators)

Gun, H20-1 W/Filter (for 2000 Series applicators)

'Plug; Pipe, g/16-18 Straight 'Coating, Primer, Locq-uic (PSNC) *Plug, Pipe, l/8 NPT 'Drain "Filter Assy 'Module, H20 'Cover, Heater 'Screw, 8.32 x .250 'Cover, Service 'Adhesive (PSNC) 'Nameplate *Retainer 'Screw, #lo-32 x 1.!50 *Screw, l/4-20 x .50 'Insulator 'Cordset (P/N 815 134 only) 'Cordset (P/N 815 162 only) 'Washer, Lock 'Nut, Panel oConnector, Male 'Body, H201 W/Filter 'Heater, Cartridge, 95W, 240V 'Screw, #5-40 x .25 'Thermostat Kit, 350* OConnector, Wire Not Used 'Strap, Cable 'Tag, Set, Guns 'Tag, Patent 'Plug, Pipe, l/16 NI?TF Not Used 'Adhesive, Loctite, Pst (PSNC) 'Washer, Lock OKit, Installation

2

2 1 1 1 1 2 1

; 1 2 2 1 1 1 1 1 1 1 2 3 1 3

1 1 1 1

; 1

* Shipped with gun unless otherwise specified on Purchase Order. For options, see Table 1.

ISSUED 3/86 SUPERSEDES z/86

LITHO U.S.A. G NORDSON CORPORATION 1986

All Rights Reserved


(s)42.3.8 Atlanta, Georgia

33,22

/a

6

TECHNICAL PUBLICATION

F WIRING DIAGRAM

6

-32

Figure 3 - H20-1 Filtered Gun with RTD/Solid State Temperature Control

24

ISSUED 2/86

LITHO U.S.A.

SUPERSEDES c NORDSON CORPORATION 1986

All Rights Reserved


Atlanta, Georgia TECHNICAL PUBLICATION ( ’ )42 l 3 l ’

H20-1 Filtered Gun with RTD/Solid State Temperature Control

Item No. Part No. Description Reqtd

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

815 138

973 574

973-402 271 484 815 119 153 011 815 122 981 055 815 118

600-141 815 117 981 176 981 239 815 116 274 685 983 161 984 155 972 628 815 163 815 115 981 000 981 005 933 056

939 110

973 577

272 720 983 103 270 763

Gun, H20 Series

OPlug; P 'Coating OPluq, P 'Drain

-1 W/Fil applica ipe, 9/l , Primer ipe, l/8

ter (for torx) 6-18 Stra Locquic

'NW

2

i

30016

at (PSNC

*Filter Assy 'Module, H20 'Cover, Heater 'Screw, 8.32 x .250 OCover, Service 'Adhesive (PSNC) 'Nameplate 'Retainer 'Screw, #lo-32 x 1.50 'Screw, l/4-20 x .50 'Insulator 'Cordset 'Washer, Lock 'Nut, Panel oConnector, Male 'Body, H201 W/Filter 'Heater, Cartridge, 95W, 240V 'Screw, #5-40 x .25 'Screw, 5-40 x 7/16 LG, OConnector, Wire Not Used 'Strap, Cable 'Tag, Set, Guns 'Tag, Patent 'Plug, Pipe, l/16 NPTF Not Used 'Adhesive, Loctite, Pst (PSNC) 'Mounting, Block, RTD 'Washer, Lock OKit, Installation

000

) 2

2 1 1 1 1 2 1

1 1 2 2 1 1 1 1 1 1 2 3 1 3

1 1

ISSUED 3186

LITHO U.S.A,

SUPERSEDES .2/8 6 c NORDSON CORPORATION 1986

All Rights Reserved

( s ) 42.3.10 0 Nordson ~~n~v~~o~gia I TECHNICAL PUBLICATION

TABLE 1 - AVAILABLE THERMOSTAT KITS (OPEN-ON-RISE)

Part No. Description Req'd

271 933 Thermostat, 225OF (105OC) 271 934 271 935

Thermostat, 250°F (12OOC)

271 936 Thermostat, 275OF (135OC)

271 928 Thermostat, 300'F (15OOC)

271 929 Thermostat, 325'F (165OC)

271 930 Thermostat, 350°F (175OC)

271 931 Thermostat, 375'F (19OOC)

271 932 Thermostat, 400'F (205OC)

271 937 Thermostat, 425'F (S:ZO"C) Thermostat, 450'F (213OOC)

1 1 1 1 1 1 1 1 1 1

ISSUED 2/8 6 LITHO U.S.A.

SUPERSEDES G NORDSON CORPORATION 1986

All Rtghts Reserved

Series H-20 Automatic Guns

Customer Product ManualPart 104 449F02

NORDSON CORPORATION � Duluth, Georgiawww.nordson.com


104449F02

Issued 3/0242-H20-MA-03

For CE Declaration, refer to melter manual.

Nordson Corporation welcomes requests for information, comments and inquiries about its products.

Address all correspondence to

Nordson CorporationAttn: Customer Service11475 Lakefield Drive

Duluth, GA 30097

Notice

This is a Nordson Corporation publication which is protected by copyright. Original copyright date 1982. No part ofthis document may be photocopied, reproduced, or translated to another language without the prior written consent

of Nordson Corporation. The information contained in this publication is subject to change without notice.

Trademarks

AquaGuard, Blue Box, Control Coat, Equi=Bead, Excel 2000, FloMelt, FoamMelt, FoamMix, Helix, Hot Shot, HotStitch, Meltex, MicroSet, MultiScan, Nordson, the Nordson logo, OmniScan, Porous Coat, Posi-Stop, RBX,

Sure-Bond, UniScan, UpTime, and Versa-Spray are registered trademarks of of Nordson Corporation.

BetterBookSM, CF, Controlled Fiberization, Easy-Screen, Fibermelt, Flo-Tracker, PrintGuard, Package of Values, andSwirl Coat are trademarks of Nordson Corporation.

Viton is a registered trademark of E.I. DuPont de Nemours & Co.

Table of Contents i


104449F02

Issued 3/0242-H20-MA-03

Table of Contents

1. Operate Safely 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Safety Symbols 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Qualified Personnel 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Intended Use 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Installation and Electrical Connections 1-4. . . . . . . . . . . . . . . . . . . . . . .

6. Operation 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Less-Obvious Dangers 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Action in the Event of Unit Malfunction 1-5. . . . . . . . . . . . . . . . . . . . .

Danger of Burns 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7. Maintenance/Repair 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8. Cleaning 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9. Thermoplastic Hot Melt Material 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10. Equipment and Material Disposal 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . .

11. Polyurethane Reactive (PUR) Hot Melt Material 1-8. . . . . . . . . . . . . . .

1. Introduction 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Component Descriptions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Block 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Heater and Temperature Sensor 2-3. . . . . . . . . . . . . . . . . . . . . . . . . .

Module 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mounting Block 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Nozzle 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Drain Valve 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adhesive Filter 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Functional Description 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Specifications 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Dimensions 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 1Safety

Section 2Description

Table of Contentsii


104449F02

Issued 3/0242-H20-MA-03

1. Introduction 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Unpacking 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Safety Precautions 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Required Tools and Materials 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Installing a Gun on a New System 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . .

Mounting the Gun 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Flushing the Gun 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Installing a Gun on an Existing System 3-8. . . . . . . . . . . . . . . . . . . . . . .

Relieving System Hydraulic Pressure 3-8. . . . . . . . . . . . . . . . . . . . . .

Removing the Existing Gun 3-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. Daily Startup and Shutdown 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. Introduction 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


3. General System Maintenance 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Daily Maintenance 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Flushing the Filter (if present) 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cleaning the Hose 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inspecting the Hose Hydraulic Connections 5-4. . . . . . . . . . . . . . . .

5. Weekly Maintenance 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cleaning the Filter (if present) 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. As Needed 5-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cleaning the Nozzle 5-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. Introduction 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Electrical Troubleshooting Procedures 6-3. . . . . . . . . . . . . . . . . . . . . . .

3. Hydraulic Troubleshooting Procedures 6-8. . . . . . . . . . . . . . . . . . . . . . .

4. Pneumatic Troubleshooting Procedures 6-8. . . . . . . . . . . . . . . . . . . . . .

5. Adhesive Application Troubleshooting Procedures 6-9. . . . . . . . . . . . .

6. Air Supply Operational Check (hydraulic pressure on) 6-15. . . . . . . . .

7. Air Supply Operational Check (hydraulic pressure off) 6-15. . . . . . . . .

8. Solenoid Valve Electrical Check 6-16. . . . . . . . . . . . . . . . . . . . . . . . . . . .

9. Wiring Diagrams 6-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 3Installation

Section 4Operation

Section 5Maintenance

Section 6Troubleshooting

Table of Contents iii


104449F02

Issued 3/0242-H20-MA-03

1. Introduction 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


3. Replacing a Module 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Replacing a Heater 7-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Replacing a Thermostat 7-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. Replacing the RTD and Cordset Assembly 7-7. . . . . . . . . . . . . . . . . . .

7. Replacing a Hose Connector O–ring 7-9. . . . . . . . . . . . . . . . . . . . . . . . .

1. Introduction 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using the Illustrated Parts List 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. H-20 Non-Filtered Automatic Gun 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . .

3. H-20 Filtered Automatic Gun Parts List 8-4. . . . . . . . . . . . . . . . . . . . . . .

4. Adhesive Filter Assembly 8-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Standard H-20 Module 8-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. H-20 LBS Module 8-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7. H-20 Micro-Adjust Module 8-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8. Optional Thermostats 8-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9. Optional Filter Screens 8-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10. Spare Parts and Service Kits 8-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Recommended Spare Parts 8-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Kits 8-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mounting Block 8-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connector Assembly 8-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Heater Cartridges 8-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cordset 8-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Filters 8-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Screens 8-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hose Installation Accessories 8-17. . . . . . . . . . . . . . . . . . . . . . . . . . .

11. H-20 Automatic Gun Nozzles 8-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12. Solenoids: Pneumatic 3-Way Valves 8-22. . . . . . . . . . . . . . . . . . . . . . . .

12. Solenoids: Pneumatic 3-Way Valves 8-22. . . . . . . . . . . . . . . . . . . . . . . .

Section 7Repair

Section 8Parts

Table of Contentsiv


104449F02

Issued 3/0242-H20-MA-03


Issued 11/94 A1EN–02–[XX–SAFE]–5

Section 1

Safety

Safety1-0


Issued 11/94A1EN–02–[XX–SAFE]–5

Safety 1-1



Section 1Safety

Safety instructions contained in this section and throughout thisdocument apply to tasks that may be performed with or on the unit.Warnings related to specific safety concerns are included within the textas appropriate. It is very important that these safety instructions arealways followed. Failure to do so could result in personal injury and/ordamage to the unit or other equipment.

With this in mind, here are some basic safety recommendations:

� Read and become familiar with this Safety section prior to installing,operating, maintaining, or repairing the unit.

� Read and follow the warnings which appear within the text and arerelated to specific tasks.

� Store this document within easy reach of personnel operating ormaintaining the unit.

� Wear personal protective equipment and clothing such as safetygoggles and gloves.

� Familiarize yourself with and follow all safety instructions prescribedby your company, general accident-prevention regulations, andgovernment safety regulations.

1. Operate Safely

Safety1-2



The following symbols are used to warn against dangers or possiblesources of danger. Become familiar with them! Failure to heed awarning could lead to personal injury and/or damage to the unit or otherequipment.

WARNING: Failure to observe may result in personal injury,death, or equipment damage.

WARNING: Risk of electrical shock. Failure to observe mayresult in personal injury, death, or equipment damage.

WARNING: Disconnect equipment from the line voltage.

WARNING: Hot! Risk of burns. Wear heat-protective clothing,safety goggles, and/or heat-protective gloves depending on thesymbols shown.

WARNING: Risk of explosion or fire. Fire, open flames, andsmoking prohibited.

WARNING: System or material pressurized. Relieve pressure.Failure to observe may result in serious burns.

CAUTION: Failure to observe may result in equipmentdamage.

CAUTION: Hot surface. Failure to observe may result inburns.

2. Safety Symbols

Safety 1-3



“Qualified personnel” is defined here as individuals who thoroughlyunderstand the equipment and its safe operation, maintenance, andrepair. Qualified personnel are physically capable of performing therequired tasks, familiar with all relevant safety rules and regulations, andhave been trained to safely install, operate, maintain, and/or repair theequipment. It is the responsibility of the company operating theequipment to see that its personnel meet these requirements.

The unit is designed and intended to be used only for the purposedescribed in the Description section. Uses not in accordance with thatsection or as described in this document are considered unintended usesand not in accordance with governing regulations.

WARNING: Use of this equipment in ways other thandescribed in this document may result in personal injury, death,or equipment damage.

The following actions of the owner or operator of the unit are some, butnot all, examples of unintended use which would permit Nordson to claimit is not responsible for personal injury or property damage arising fromsuch unintended use:

� Unapproved modifications or changes to the unit

� Failure to comply with the safety instructions

� Failure to comply with instructions concerning installation, use,operation, maintenance, or repair, or when these tasks are carried outby unqualified personnel

� Use of inappropriate or incompatible foreign materials or auxiliaryequipment

� Failure to observe workplace safety rules or regulations issued bygovernment authorities or safety councils

3. Qualified Personnel

4. Intended Use

Safety1-4



WARNING: Failure to follow the safety procedures can result ininjury or death.

� All electrical, pneumatic, gas, and hydraulic connections andinstallations of hot melt equipment may only be carried out byqualified personnel. Be sure to observe installation instructions forcomponents and accessories.

� Equipment must be properly grounded and fused according to itsrated current consumption (see ID plate).

� Cables which run outside the unit must regularly be checked for wearor damage.

� Power supply wire gauge and insulation must be sufficient to handlerated current consumption.

� Cables must never be squeezed or pinched. Do not locate cables orhoses in high traffic areas.

The unit should be operated by qualified personnel in accordance withthe instructions presented in this document.

WARNING: Failure to follow the safety procedures can result ininjury or death.

� Never allow the unit to be operated by personnel under the influenceof substances which reduce their reaction times, or who are not ableto operate the equipment for physical reasons.

� Prior to each start-up of the unit, check protection and warningdevices and make sure they are fully functional. Do not operate theunit if these devices are not functioning properly.

� When the removal of safety equipment is required for installation,maintenance, or repair of the unit, it must be re-connectedimmediately upon completion of the work.

� Prior to start-up of the unit, check to make sure all safety guards andsafety equipment are in place and functioning properly.

5. Installation and ElectricalConnections

6. Operation

Safety 1-5



� In a humid environment, only equipment featuring a correspondingclass of protection may be operated.

� Do not operate the unit in an explosive environment.

� Keep parts of the body or clothing away from rotating parts. Do notwear loose articles of clothing when operating or servicing units withrotating parts. Take off wrist watches, rings, necklaces, or similarpieces of jewelry and pin up or cover long hair before performing anywork on or with the unit.

� To carry out measurements on work pieces, switch off the unit andwait until it comes to a standstill.

� Never point hand guns or applicator nozzles at yourself or otherpersons.

WARNING: An operator or service technician working with theunit should be aware of less-obvious dangers that often cannotbe completely minimized at production sites:

� Exposed surfaces of the unit which cannot be practicallysafeguarded. They may be hot and take time to cool after the unithas been operating.

� The possibility that electrical potentials may remain in the unit afterthe unit was de-energized

� Hot melt material and vapors

� Hydraulically or pneumatically operated parts of the unit

� Parts winding something up or down which are not covered

If the unit malfunctions, switch it off immediately.

� Turn the circuit breaker or main power switch OFF.

� Have the unit repaired by qualified personnel only.

6. Operation (contd)

Less-Obvious Dangers

Action in the Event of UnitMalfunction

Safety1-6



Contact with hot melt materials or hot areas of the unit may produce asevere skin burn.

WARNING: Hot! Risk of burns. Wear heat-protective clothing,safety goggles, and/or heat-protective gloves depending on thesymbols shown.

� Be extremely careful when using hot melt material. Even solidifiedmaterial may still be very hot.

� Always wear protective clothing which safely covers all exposed partsof the body.

In case of burns:

� Immediately cool affected skin areas using cold, clean water.

� Do not forcefully remove hot melt material from the skin.

� Immediately seek medical attention.

Allow only qualified personnel to perform the procedures described in thisdocument. When performing such tasks, wear protective clothing, andequipment.

WARNING: Even when the circuit breaker or main powerswitch is OFF, the unit is still electrically energized. Completethe following steps prior to maintenance or repair:

� Disconnect, lock out, and tag external power supply.

� To ensure the external power supply is disconnected, attempt tooperate the unit. If the unit does not energize, proceed withmaintenance or repair work.

� If the unit energizes, repeat the disconnect, lock out, and tagprocedure. Re-test the unit.

Danger of Burns

7. Maintenance/Repair

Safety 1-7



� Follow the specific instructions provided in this manual to relieve thesystem pressure in the entire unit.

� Secure pneumatically- or hydraulically-operated equipment againstuncontrolled movement.

� Only use parts which do not compromise the safety of the unit. Onlyuse genuine Nordson parts.

� Always use tools with insulated handles when removing or installingcomponents.

NOTE: Always refer to the material manufacturer’s Material Safety DataSheet (MSDS) or material information sheet before working with any ma-terial.

WARNING: Never clean any aluminum part or flush anysystem using halogenated hydrocarbon fluids. Examples ofcommon halogenated hydrocarbons are: dichloromethylene,1,1,1-trichloroethylene, and perchloroethylene. Halogenatedhydrocarbons may react violently with aluminum parts.

WARNING: Fire, open flame, and smoking are prohibited whencleaning fluids are used. Observe all explosion preventionregulations. Cleaning fluids may only be heated usingtemperature-controlled and explosion-protected heaters.

� Never use an open flame to clean the unit or components of the unit.

� Use only cleaning fluids designed or intended to be used with the hotmelt material being used in the unit. Never use paint fluids under anycircumstances.

� Note the flash point of the cleaning fluid used. Only use a controlledheating method to heat fluids.

� Ensure sufficient room ventilation to draw off generated vapors.Avoid prolonged breathing of vapors.

7. Maintenance/Repair (contd)

8. Cleaning

Safety1-8



NOTE: Always refer to the material manufacturer’s Material Safety DataSheet (MSDS) or material information sheet before working with any hotmelt material.

� Ensure the work area is adequately ventilated.

� Do not exceed recommended processing temperatures. Doing socreates a danger to personnel due to decomposition of the material.

Dispose of equipment and materials used in operation and cleaningaccording to local regulations.

NOTE: Always refer to the material manufacturer’s Material Safety DataSheet (MSDS) or material information sheet before working with any hotmelt material.

WARNING: Exercise extreme caution and always provideadequate ventilation when using reactive materials.

WARNING: Only use PUR material in units that are designedto process such material. Using PUR material in units thatcannot process them can cause damage to the unit andpremature reaction of the hot melt material.

WARNING: PUR material contains isocyanate ingredientswhich will irritate skin, mucous membranes of eyes andrespiratory passages.

WARNING: Persons with existing asthmatic conditions mayexperience difficulty in breathing.

9. Thermoplastic Hot MeltMaterial

10.Equipment and MaterialDisposal

11. Polyurethane Reactive(PUR) Hot Melt Material

Safety 1-9



Because isocyanate ingredients are found in various concentrations inreactive materials produced by different manufacturers, it is imperativethat the material manufacturer’s MSDS or material information sheet beconsulted before using reactive material. Pay particular attention to thediscussion of material toxicity, health effects, and reactivity condition.

There are certain universal safety guidelines that should be followedwhen using any reactive material:

� Recommended processing temperatures must not be exceeded.

� When handling and using reactive material, always wear thermallyprotective gloves and long-sleeved clothing.

� Wear chemical goggles to reduce the potential of eye contact.

� Have eye washes available and provide a cold water source for burntreatment.

� The regular use of barrier cream for hands and face is recommendedfor skin protection.

� Do not eat, drink, smoke, or store food in working areas where PURmaterial is being processed.

� Wash hands thoroughly after working with reactive material.

� Remove hot melt material vapors using suitable extraction ventilationequipment.

� Use appropriate respiratory equipment where there is the danger ofinhaling isocyanate vapors or other ingredients contained in the PURmaterial in concentrations exceeding permissible limit values.

� In case of very high concentrations of harmful substances, or if youare unsure of the environmental conditions, respiratory protectiveequipment (operating independent of the surrounding air) must beused.

� Do not operate the unit with PUR materials if you are unsure that alladequate safety measures have been taken.

11. Polyurethane Reactive(PUR) Hot Melt Material (contd)

Safety1-10




104449F02

Issued 3/0242-H20-MA-03

Section 2

Description

Description2-0


104449F02

Issued 3/0242-H20-MA-03

Description 2-1


104449F02

Issued 3/0242-H20-MA-03

Section 2Description

Nordson Series H-20 guns automatically dispense hot melt adhesive ontoa moving substrate when triggered by an electrically-controlled solenoidvalve. The H-20 gun is especially suited for high-flow, intermittentapplications up to 3,000 cycles per minute, and is excellent for use withhigh viscosity and filled materials.

The H-20 gun can be mounted either vertically or horizontally. Modulescan be replaced in only a minute or two, and the quick-disconnectcordset makes electrical hookup fast and easy.

The air-open, spring-close module provides longer component life,superior cut-off, greater bead uniformity, and the ability to handle a widerange of hot melt adhesives.

The higher flow rate of the H-20 gun makes this gun well-suited for usewith multi-orifice, domed nozzles and Nordson Corporation’s newprecision 232 XXX series of single-orifice nozzles.

The H-20 gun is available in several variations, all of which are coveredin this manual:

� Resistance temperature detector (RTD) or thermostattemperature control. The specific type is dependent on customerequipment requirements.

� Water-resistant and non-water-resistant versions. Thewater-resistant version is used primarily in food industry locations.

� Filtered or non-filtered guns. Filtered guns use a filter assemblyto prevent contaminants from entering the gun module andclogging the nozzle.

� Standard or LBS (large ball and seat) module. The LBS typemodule is used for higher output applications.

� Standard or micro-adjust module. The micro-adjust moduleallows balanced flow rates without changing hydraulic pressure.The module is used where flow control and bead size are critical.

1. Introduction

Description2-2


104449F02

Issued 3/0242-H20-MA-03

The major components of a typical H-20 non-circulating gun are shown inFigure 2-1. Your gun may vary slightly.

4202063

4

3

5

1

2

7

4

6

1

3

2

5

2

Non-Filtered H-20 Gun Filtered H-20 Gun

Fig. 2-1 Major Components of a Typical H-20 Gun (Temperature sensor is hidden from view)

1. Service block2. Heater3. Module

4. Mounting block5. Nozzle (ordered separately)

6. Drain valve (filtered guns only)7. Adhesive filter (filtered guns only)

The aluminum service block serves as the base of the H-20 gun. Thefilter (if present), heater cartridge, temperature sensor, gun module, andmounting block all attach directly to the service block.

2. Component Descriptions

Service Block

Description 2-3


104449F02

Issued 3/0242-H20-MA-03

Replaceable electric heater cartridges inside the H-20 gun service blockensure that the hot melt adhesive is kept at application temperature as itflows through the gun. One heater is used on non-filtered guns, and twoheaters are used on filtered guns.

Depending on customer specifications, temperature is sensed either by areplaceable open-on-rise thermostat or an RTD inside the service block.

In a thermostatically-controlled H-20 gun, the thermostat acts as an on/offswitch. When the service block temperature reaches the preset rating ofthe thermostat, the thermostat opens to stop power from reaching theheater. When the service block temperature drops enough, thethermostat closes and routes power back to the heater.

In an RTD-controlled H-20 gun, the RTD provides data to the electroniccircuitry inside the hot melt unit or other remote temperature controldevice. The temperature controller uses this input to control power to theheater to maintain setpoint temperature.

While an RTD-controlled H-20 gun is able to maintain setpointtemperature within 0.5 �C (1 �F), the variance in athermostatically-controlled H-20 gun is 7 �C (15 �F).

The module is bolted to the service block and is the valve mechanismthat actually dispenses hot melt adhesive onto the substrate. It consistsof an air-operated piston, a spring-loaded packing cartridge, and either aball-and-seat or needle-and-seat orifice housed in an aluminum block.

A ball-and-seat arrangement is used in the standard and LBS typemodules. The micro-adjust type module is equipped with an adjustmentmechanism in the module air cap and needle-and-seat orifice foradhesive flow control.

The mounting block is bolted to the top of the service block and securesthe gun assembly in place. Several different types of mounting blocksare used. Therefore, yours may vary from those shown in Figure 2-1.

A complete selection of Series H-20 gun precision nozzles allows you toderive optimum performance from your hot melt system. A wide varietyof orifice diameters and lengths is available. In addition to straightsingle-orifice nozzles, multiple-orifice nozzles and 236 XXX seriesadapters can be specified.

NOTE: Refer to the Parts section or the Nordson Adhesives andSealants Equipment Catalog for a list of Series H-20 gun nozzle partnumbers.

Heater and TemperatureSensor

Module

Mounting Block

Nozzle

Description2-4


104449F02

Issued 3/0242-H20-MA-03

The drain valve is used only on filtered gun service blocks. It is used torelieve hydraulic pressure and remove accumulated char and otherdebris from the service block as part of the filter cleaning procedure.

The drain valve can be located on either side or on the rear of the gunservice block.

On filtered versions of the H-20 gun, an adhesive filter is threaded intothe top of a special service block. The purpose of the filter is to removechar and debris from the adhesive. This reduces nozzle blockage andresulting poor coating of the substrate.

The filter consists of a mesh screen on a threaded holder and can beeasily removed for cleaning as needed.

See Figure 2-2. Hot melt adhesive from the hot melt unit is pumped tothe H-20 gun service block through a heated hose.

The hose is equipped with a built-in cordset (2) that includes an internalheating element and temperature sensor (3). The cordset plug at theinput end of the hose is connected to the hot melt unit or other remotetemperature control device.

The H-20 gun cordset connects to the output end of the hose. The hotmelt unit powers a cartridge heater (6) in the gun service block (5)through the hose cordset.

During normal operation, the hot melt unit pump is activated andadhesive flows through the service block and out from the nozzle at thebottom of the H-20 gun module.

In filtered H-20 guns, incoming adhesive flows through a mesh screeninside the gun service block, depositing char and debris on the outside ofthe screen. The filtered adhesive then flows into the H-20 gun module.

Drain Valve

Adhesive Filter

3. Functional Description

Description 2-5


104449F02

Issued 3/0242-H20-MA-03

4202064

1

2

3

4

56

7

8

9

10

11

Fig. 2-2 Sectional View of a Typical H-20 Non-Filtered Gun

1. Air inlet2. Cordset3. Temperature sensor (thermostat

shown)4. Adhesive inlet5. Service block6. Cartridge heater

7. Ball-and-seat8. Nozzle retaining nut9. Spring

10. Gun Module11. Piston assembly

When an external solenoid mounted to the gun is triggered, compressedair enters the air inlet (1) and flows into the H-20 gun module to force thepiston upward, lifting the attached ball from its seat, allowing flow to thenozzle. The pressurized adhesive then flows through the nozzle.

When the solenoid is de-energized, the compressed air supply stops andan internal spring (9) forces the piston assembly (11) down, and the ballseals against its seat to stop adhesive flow.

Description2-6


104449F02

Issued 3/0242-H20-MA-03

Table 2-1 H-20 Gun Specifications

Parameter Value

Pattern Capability Pattern controlled by number of modules and type of nozzle

Heater ElectricalRequirements

120 Vac/230 Vac +/– 10%, single-phase (gun-dependent)

Maximum Temperature 230 �C (450 �F)

Temperature Control Stability ± 0.5 �C (1.0 �F) in RTD-controlled guns

± 7.0 �C (15.0 �F) in thermostatically-controlled guns

Hose Connections Straight, 45�, and 90� connectors for 5/16 in. ID hoses

Straight and 45� connectors for 5/8 in. ID hoses

Filter Type (filter guns only) Flow-through filter; 70 x 80 mesh (0.006 in.; 140 microns)supplied as standard

Input Air 276 to 483 kPa (40 to 70 psi)

Dry, regulated, unlubricated air.

Operating Speed Exceeds 3,000 cycles per minute

Maximum Working HydraulicPressure

10.3 mPa (1,500 psi)

Nozzle Requirements 231 0XX, 231 XXX, 220 XXX, 232 XXX precision nozzles.

Nozzles must be specified and purchased separately.

Ambient Temperature Range 0 �C to 50 �C (32 �F to 120 �F)

4. Specifications

Description 2-7


104449F02

Issued 3/0242-H20-MA-03

Dimensions for a typical Series H-20 non-filtered gun are shown inFigure 2-3.

4202015

3.8 cm(1.50 in.)

1.4 cm(0.56 in.)

1.9 cm(0.75 in.)

1.4 cm(0.547 in.)

DIAMETER HOLES

14.3 cm(5.63 in.)

11.1 cm(4.38 in.)

A

B

C

D

ESIDE

FRONT

TOP

Fig. 2-3 Non-filtered H–20 Gun Dimensions (Typical)

Model Dimensions, cm (in.)

A B C D E

H-20 gunW 4.14(1.63)

11.13(4.38)

11.43(4.50)

10.31(4.06)

1.91(0.75)

H-20 gunA, H-20 gunT,H-20 gunD, H-20 gunF,H-20 gun LBS(5/16 in. hose)H-20 gun with Micro-Adjust

4.45(1.75)

8.74(3.44)

11.76(4.63)

10.31(4.06)

1.91(0.75)

H-20 gunB, H-20 gunC 5.87(2.31)

8.74(3.44)

10.49(4.13)

10.49(4.13)

2.87(1.13)

H-20 gunE 5.72(2.25)

8.89(3.50)

10.49(4.13)

10.31(4.19)

2.87(1.13)

H-20 gun LBS(5/8 in. hose)

4.45(1.75)

8.74(3.44)

12.93(5.09)

10.31(4.06)

1.91(0.75)

5. Dimensions

Description2-8


104449F02

Issued 3/0242-H20-MA-03

Dimensions for a typical Series H-20 filtered gun are shown in Figure 2-4.

4202016

2.4 cm(0.96 in.)

3.8 cm(1.50 in.)

11.9 cm(4.69 in.)

13.0 cm(5.10 in.)

14.1 cm(5.55 in.)

9.4 cm(3.70 in.) 1.4 cm

8.5 cm(3.4 in.)

(0.532 in.)DIAMETER HOLES

Fig. 2-4 H-20 Filtered Gun Dimensions (Typical)

5. Dimensions (contd)


104449F02

Issued 3/0242-H20-MA-03

Section 3

Installation

Installation3-0


104449F02

Issued 3/0242-H20-MA-03

Installation 3-1


104449F02

Issued 3/0242-H20-MA-03

Section 3Installation

WARNING: Allow only qualified personnel to perform thefollowing tasks. Follow the safety instructions in this documentand all other related documentation.

This section provides unpacking, safety, and installation informationnecessary for installing the Nordson Series H-20 Guns.

Other than using normal care, no special instructions are necessary tounpack H-20 guns.

Besides the safety instructions already stated in the Safety section of thismanual, observe and follow these as well.

WARNING: Relieve hydraulic pressure in the system beforeopening any hose or gun connection. For specific instructions,consult the hot melt unit operator’s manual. Failure to relievehydraulic pressure can result in serious burns

WARNING: Air trapped in the hoses and guns can spit moltenadhesive that can cause severe burns. Shield the area and theoperator before triggering the guns.

WARNING: Hot! Risk of burns. Do not to place bare handsunderneath the gun or the hose fitting. Hot melt material thatremains in the gun or hose after draining can cause severeburns

1. Introduction

Unpacking

2. Safety Precautions

Installation3-2


104449F02

Issued 3/0242-H20-MA-03

CAUTION: The solenoid valve can be damaged if its voltagerating does not match the input voltage from the triggeringdevice. Make sure the ratings match.

CAUTION: System clogging can occur when certain adhesivesreact with the fluid used during factory testing. To avoidequipment damage, check with your adhesive supplierregarding adhesive compatibility.

Before proceeding, be sure to have on hand the following items:

� Hot melt unit and associated equipment operator’s manuals

� Safety goggles

� Safety gloves

� Long-sleeve protective clothing

� Wrenches of the following sizes: 8 mm (5/16 in.), 16 mm (5/8 in.),18 mm (11/16 in.), 21 mm (13/16 in.), 32 mm (11/4 in.)

� Flat-blade screwdriver

� Solenoid valve (one per gun)

� Nordson automatic gun hose (one per gun)

� Anti-seize compound

� Drain pans

2. Safety Precautions (contd)

3. Required Tools andMaterials

Installation 3-3


104449F02

Issued 3/0242-H20-MA-03

Use this procedure to install a gun in a system in which no adhesive hasbeen melted. If you are replacing an existing H-20 gun, refer to Installinga Gun on an Existing System in this section.

1. See Figure 3-1. Ensure that input power to the system isdisconnected and locked out.

2. Slide the gun onto a pair of 13 mm (0.50 in.) diameter mounting bars,position the gun at the desired application point, then finger-tightenthe screw on the mounting block.

NOTE: Several different types of H-20 gun mounting blocks areused. Your application’s mounting bracketry may be different from thetype shown here.

4202065

2

1

Fig. 3-1 Installing a typical H-20 Gun

1. 13 mm (0.50 in.) diametermounting bar

2. Mounting block screw

3. Position the gun so that the nozzle is no more than 13 mm (0.50 in.)above the substrate.

NOTE: This nozzle-to-substrate distance gives the best control ofadhesive bead position, the best response time, and the minimumamount of heat loss.

4. Use a wrench to securely tighten the screw on the gun mountingblock.

NOTE: Protect the gun from vibration and secure it to prevent gunmovement during operation.

4. Installing a Gun on a NewSystem

Mounting the Gun

Installation3-4


104449F02

Issued 3/0242-H20-MA-03

5. Route the hose from the gun to the hot melt unit in accordance withthe Guidelines for Hose Installation illustrated in Figure 3-2.

4202066

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ




X=13 mm (0.50 in.)

R=203 mm (8.00 in.)

X

Fig. 3-2 Guidelines for Hose Installation

Mounting the Gun (contd)

Installation 3-5


104449F02

Issued 3/0242-H20-MA-03

NOTE: Refer to the Parts section for information on ordering hoseinstallation accessories.

6. Thread the hose swivel fitting onto the gun O-ring connector until theconnection is finger-tight.

NOTE: The H-20 gun is equipped with hydraulic ports on both sidesas well as the rear of the service block. To adapt the gun for yourapplication, remove the threaded plug from the desired hydraulic port,install the gun O-ring connector in the desired hydraulic port, andinstall the threaded plug in the unused hydraulic port.

7. See Figure 3-3. Use two wrenches to tighten the hose-to-gunconnection. See Table 3-1 for the correct wrench size for yourapplication. Do not overtighten the fittings.

NOTE: Nordson Corporation recommends the use of an unheatedin-line adhesive filter at the hose-to-gun connection when usingunfiltered guns.

Table 3-1 Hose Connector Wrench Sizes

Hose ID Size O-Ring ConnectorWrench Size

Hose Swivel Fitting WrenchSize

8 mm (5/16 in.) 16 mm (5/8 in.) 18 mm (11/16 in.)

16 mm (5/8 in.) 32 mm (11/4 in.) 32 mm (11/4 in.)

4202018

Fig. 3-3 Attaching the Hose Swivel Fitting to the Gun O-ring Connector(Typical)

4202067

1

2

3

Installation3-6


104449F02

Issued 3/0242-H20-MA-03

8. Install an insulation cuff over the hose-to-gun connection.

9. Repeat steps 6, 7, and 8 to attach the other end of the hose to the hotmelt unit.

10. Apply anti-seize compound to the threads of a rigid 1/8-NPT pipenipple.

CAUTION: To minimize lag time between solenoid actuationand gun firing, use a pipe nipple as close as possible to 7.6 cm(3.0-in.) long. If you use a pipe nipple longer than 25 cm(10-in.) and/or use a flexible line between the solenoid andgun, gun performance may decrease.

11. See Figure 3-4. Connect one end of the pipe nipple (2) to thesolenoid valve (1).

NOTE: Nordson recommends using a solenoid valve equipped withhigh-temperature modifications and a flow rating (Cv) of at least 0.5.

12. Remove the threaded plug from the gun service block air inlet (3),then connect the other end of the pipe nipple (2) to the open air inlet.

NOTE: If you use the air inlet on top of the gun service block, install athreaded plug in the air inlet at the rear of the gun service block. Ifyou use the air inlet at the rear of the service block, install a threadedplug in the air inlet on top of the gun service block.

Fig. 3-4 Pipe Nipple and SolenoidAttached to the GunService Block (Typical)

1. Solenoid valve2. Pipe nipple3. Air inlet

13. Connect a filtered and regulated air line to the solenoid valve. Theregulator must be capable of air pressure 276–483 kPa (40–70 psi).

14. Follow the manufacturer’s instructions to connect the solenoid valveelectrically to the triggering device.

Mounting the Gun (contd)

Installation 3-7


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15. Plug the gun cordset into its socket at the end of the hose.

NOTE: H-20 guns equipped with a Series 2300 or 3000 cordset havea quick-disconnect style cordset plug. H-20 guns equipped withcordsets for other applicators require hardwired connections. Refer toyour hot melt unit manual for specific instructions for your system.

4202020

Fig. 3-5 Plugging the Gun Cordset into the Hose Socket (Series 2300 and3000 style shown)

CAUTION: Risk of module failure. Machined parts in the hotmelt unit, hose, or gun service block may contain small metallicparticles that can clog the module. Follow the instructionsbelow for flushing the gun with adhesive.

WARNING: Hot! Risk of burns. Wear safety gloves. Failure toobserve this warning could result in personal injury.

1. With a drain pan below the H-20 gun, use a 21 mm (13/16 in.) wrenchto loosen then remove the retaining nut and nozzle.

2. Trigger the gun solenoid to keep the gun module open.

3. Flush the system by following the instructions in the hot melt unitoperator’s manual.

4. Reinstall the nozzle and retaining nut onto the gun module andremove the drain pan.

Flushing the Gun

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Follow this procedure to install an H-20 gun on an existing system.

Follow this procedure before opening any hydraulic connection in thesystem.

1. Heat the system to operating temperature.

2. Make sure the hot melt unit pump is off.

3. Place drain pans below the H-20 guns.

WARNING: Risk of serious burns from the dischargedpressurized hot melt adhesive. Relieve hydraulic pressurebefore opening the filter drain valve.

4. Trigger all guns to relieve any trapped hydraulic pressure.

CAUTION: Use a flat-blade screwdriver to open or close thedrain valve. Equipment damage can occur if the drain valve isopened or closed with anything other than a flat-bladescrewdriver.

5. If the gun is filtered, turn a flat-blade screwdriver counterclockwise toopen the drain valve in the gun service block. If the gun isnon-filtered, go to step 6.

6. Reduce air pressure to the H-20 gun solenoids to zero at theregulator.

7. Place a drain pan under the hot melt unit drain valve.


CAUTION: Use a screwdriver to open or close the drain valve.Equipment damage can occur if the hot melt unit drain valve isopened or closed with anything other than a screwdriver.

8. Use a flat-blade screwdriver to open the hot melt unit drain valve.

9. Allow some hot melt adhesive to drain from the manifold.

5. Installing a Gun on anExisting System

Relieving System HydraulicPressure

Installation 3-9


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10. When adhesive stops flowing from the hot melt unit drain valve (andgun drain valve if present), hydraulic pressure is relieved.

11. Use a flat-blade screwdriver to close the hot melt unit drain valve(and gun drain valve if present).

12. Properly dispose of the drained adhesive.

Follow these steps to remove an existing gun from the system.

1. Disconnect and lock out power from the hot melt unit circuit breaker.

2. Unplug the gun cordset from the socket at the end of thehydraulic hose.

NOTE: H-20 guns equipped with a Series 2300 or 3000 cordset havea quick-disconnect style cordset plug. H-20 guns equipped withcordsets for other applicators require hardwired connections. Refer toyour hot melt unit manual for specific instructions for your system.

3. Place a drain pan under the gun assembly.

4. See Figure. 3-3. Use two wrenches to undo the hose-to-gunconnection. Refer to Table 3-1 for the correct wrench size for yourapplication.

5. Disconnect the input air supply from the gun service block.

6. Remove the gun assembly from its mounting bars.

7. Refer to Mounting the Gun to install the new H-20 gun.

Removing the Existing Gun

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Section 4

Operation

Operation4-0


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Operation 4-1


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Section 4Operation


Refer to the hot melt unit operator’s manual and triggering device manualas necessary.

The sequential startup feature is standard on hot melt applicators thatuse RTD controlled H-20 guns, including Series 2300, Series 3000, andSeries 6000 hot melt applicators.

NOTE: If using a Series 6000 hot melt applicator, you must make surethe sequential startup feature is enabled.

In systems equipped with sequential startup, you switch on the hot meltapplicator and the following occurs:

1. Power is supplied to the melt unit tank heaters until it has reached thesetpoint temperature.

2. Power is supplied to the hose heaters until they have reached thesetpoint temperature.

3. Power is supplied to the gun heaters until they have reached thesetpoint temperature.

Thermostatically-controlled systems are not equipped with sequentialstartup. In these systems, some self-relieving of hydraulic pressure atthe gun is normal (dripping, drooling, etc.).

On H-20 gun modules equipped with the micro-adjust feature, loosen thelocknut on top of the module, then turn the adjusting screw in or out asrequired to fine-tune the amount of output.

1. Daily Startup andShutdown

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Section 5

Maintenance

Maintenance5-0


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Maintenance 5-1


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Section 5Maintenance


This section provides preventive maintenance procedures recommendedfor the H-20 gun and attached hose. Maintenance instructions for the hotmelt unit can be found in the hot melt unit operator’s manual.


CAUTION: Faulty or damaged hoses are not field-repairableand must be replaced. Contact your Nordson representative forreplacement and return information.

WARNING: Damage to the hose, improper system operation,or personal injury may result if you attempt maintenanceprocedures other than those provided here.

CAUTION: Sludge formation can occur if a cleaning solution isused that is not compatible with the hot melt adhesive material.Use extreme care in selecting a cleaning fluid other thanType-R fluid. Test the fluid with a small sample of adhesive forcompatibility before using the fluid in the system.

CAUTION: Gun nozzles can be damaged if you use an opentorch, drill, or broach to clean a nozzle. Use only a pin-typeprobe to clean the nozzles. We recommend that you use theNordson Corporation nozzle cleaning kit.

1. Introduction


Maintenance5-2


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Use the table below to properly maintain your H-20 gun.

Table 5-1 Recommended Maintenance

Frequency Procedure

Daily Inspect the gun assembly. Pay special attention to the bore hole in the side of the module.Any signs of adhesive in this hole indicate failure of the packing cartridge inside the modulebody. Replace the module as described in the Repair section.

Clean all exterior surfaces of the gun assembly. Accumulated hot melt adhesive at the nozzlecan char and cause poor bead patterns.

Flush the H-20 gun adhesive filter (if present) as described in Flushing the Filter later in thissection.

Clean the hose exterior and inspect the hose hydraulic connections. Refer to Cleaning theHose and Inspecting the Hose Hydraulic Connections procedures in this section.

Keep the supply of adhesive in the hot melt unit clean and free of contaminants. Foreignparticles in the adhesive can block the gun assembly and cause poor application results.

Weekly Clean the H-20 gun adhesive filter (if present) as described in Cleaning the Filter later in thissection.

Every 6 Months With the power locked out, remove the electrical cover from the H-20 gun and check that theheater and temperature sensor leads are tight and secure. Tighten any loose connections.Replace the heater and/or temperature sensor as described in Repair if any of the leads arefrayed enough to allow bare wires to touch each other or the service block.

NOTE: Vibration and heating/cooling cycles may loosen connections. This could result indamage to electrical components or improper operation of the system.

Flush the system, including the guns. Flushing removes excess dirt and charred material.System flushing also should be done when changing over to a different adhesive, and whenthe old and new adhesives are incompatible.

Refer to Preventive Maintenance in the hot melt unit manual for specific information aboutflushing the system.

If Needed Clean the gun nozzle as described in Cleaning the Nozzle later in this section.

3. General SystemMaintenance

Maintenance 5-3


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Issued 3/0242-H20-MA-03

NOTE: Relieve system hydraulic pressure as described in theInstallation section before opening any hydraulic connection.

Flushing the filter removes char and other debris that builds up in thefilter screen during operation.

Flush the filter daily unless operating experience indicates that more orless frequent flushing is required. Among the factors that contribute tohow often a filter must be flushed are plant operating conditions and thetype of adhesive being used.

1. Bring the system to operating temperature.

2. Ensure that the hot melt unit pump is off.

3. Place a drain pan below the H-20 gun.

WARNING: Risk of serious burns from the dischargedpressurized hot melt adhesive. Relieve hydraulic pressurebefore opening the drain valve.

4. Trigger all guns to relieve any trapped hydraulic pressure.

CAUTION: Use a flat-blade screwdriver to open and close thedrain valve. Equipment damage can occur if the drain valve isopened or closed with anything other than a screwdriver.

5. Open the drain valve in the gun service block with a flat-bladescrewdriver by turning it counterclockwise.

6. Turn on the hot melt unit pump.

7. Slowly increase the pump speed until the draining adhesive is free ofimpurities, then turn off the pump.

8. Use the flat-blade screwdriver to turn the gun drain valve clockwiseand close it.

9. Remove the drain pan and proceed with normal operation.

10. Wipe off any hot melt material from the hose fittings and the hosebraid daily.

4. Daily Maintenance

Flushing the Filter (if present)

Maintenance5-4


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Issued 3/0242-H20-MA-03

NOTE: Keep the braid of the hose free of hot melt adhesive. Built-upmaterial can cause kinking when the hose is moved from one position toanother.

Clean any dust and debris from the work area.

Perform this procedure each day unless operating experience indicatesthat more or less frequency is required.

1. Relieve the system hydraulic pressure as described in the Installationsection.

2. Inspect the hose fittings for tightness or cross-threading.

3. If a hose fitting is loose, use two wrenches to tighten the hose swivelfitting onto the O-ring connector. Refer to Table 3-1 for the correctwrench size for your application.

4. If a hose swivel fitting is cross-threaded onto its O-ring connector,undo the connection, then reinstall the hose swivel fitting properly.

5. Resume normal operation.

6. If adhesive leaks at a hose connection, refer to Replacing a HoseConnector O-ring in the Repair section of this manual.

This section describes maintenance procedures that should beperformed weekly to the H-20 gun.

Cleaning the filter removes char and other debris that builds up in thefilter, especially the filter screen, even though the filter may be flusheddaily.

Clean the filter each week unless operating experience indicates thatmore or less frequent cleaning is required.

1. Perform steps 1 through 7 of the procedure Flushing the Filter in thissection.

2. Trigger the gun to relieve any trapped hydraulic pressure.

3. Use a socket wrench or similar tool to unscrew then remove the filterfrom the service block.

4. Remove the screw from the filter bung, then disassemble the filter.

5. Use any of the following three methods listed in Table 5-2 to clean thefilter assembly:

Cleaning the Hose

Inspecting the HoseHydraulic Connections

5. Weekly Maintenance

Cleaning the Filter (if present)

Maintenance 5-5


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Issued 3/0242-H20-MA-03

Table 5-2 Filter Component and Nozzle Cleaning Methods

Method A WARNING: Risk of fire. Do not heat Nordson Type-R fluid above 246 �C (475 �F). Use only acontrolled heating device (such as a small deep fat fryer or thermostatically-controlled hot plate) toheat the fluid above the melting temperature of the hot melt material. A fire hazard exists if an openflame or if an unregulated heating device is used to heat Type-R fluid.

Place the filter components (except for the O-ring) and/or nozzle in a container of Nordson Type-Rfluid and heat the fluid until it is above the melting point of the adhesive. Scrub the filter componentsand/or nozzle with a fine bristled brush until clean. Remember to scrub the filter screen inside andout. Wipe the components with a clean, dry cloth.

NOTE: Do not use a metal brush. Damage may result preventing proper operation.

Method B Use a flameless electric heat gun or compressed hot air to heat the filter components and/or nozzle.Then wipe with a clean, dry cloth.

Method C Use an ultrasonic cleaner filled with cleaning fluid to clean the filter components and/or nozzle. Thenwipe with a clean, dry cloth.

6. Inspect the screen for damage. Any dents or breaks in the meshmean that the screen is damaged and should be replaced. Refer tothe Parts section for the correct filter screen part number for yourapplication. Always use a filter with a smaller screen size than thenozzle orifice size.

7. Reassemble the filter components using a new O-ring.


CAUTION: Ensure that the gun service block is at operatingtemperature when the filter is reinstalled. Cold material on thefilter or service block walls can cause the filter screen tocollapse.

9. Thread the filter into the service block until the filter is only hand-tight.

10. Ensure that the gun drain valve is open and a drain pan is below thedrain valve. Turn on the hot melt unit pump and allow adhesive toflow from the H-20 gun drain valve until the adhesive is clean and freeof all contaminants.

11. Turn off the hot melt unit pump.

12. Use a flat-blade screwdriver to close the gun drain valve.

13. Tighten the filter until it seats, but do not overtighten.

14. Remove the retaining nut and nozzle and turn on the hot melt unitpump. Trigger the gun and allow adhesive to flow through the gunand into the drain pan until the flow is free of any impurities.

Maintenance5-6


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Issued 3/0242-H20-MA-03

15. Turn off the hot melt unit pump and reinstall the gun nozzle andretaining nut.

16. Remove the drain pan and resume normal operation.

Nozzle clogging occurs when a filter screen is damaged or when there ischarred material in the hose or gun. Char may form if adhesive is heatedabove the application temperature recommended by the adhesivemanufacturer. If nozzle clogging or char formation occur, it may benecessary to replace the module as described in the Repair section.

If nozzle clogging persists, remove the gun assembly from its installation,remove the module, and totally clean the service block hydraulicpassage.

Clean all nozzles each week unless operating experience indicates moreor less frequent cleaning is required. Refer to the Parts section for thenozzle cleaning kit part number.

If you are replacing an existing nozzle with a nozzle of a different orificesize on an H-20 filtered gun, refer to the table of Optional Filter Screensin the Parts section. Always use a filter with a smaller screen size thanthe nozzle orifice size.

Use this procedure to clean the gun nozzle:

1. Relieve hydraulic pressure as described in the Installation section.


2. With a drain pan beneath the gun module, use a 21 mm (13/16 in.)wrench to loosen and remove the nozzle retaining nut and nozzle.

3. Use any of the three methods in Table 5-2 to clean the gun nozzle.

Cleaning the Filter (if present)(contd)

6. As Needed

Cleaning the Nozzle

4204026

Maintenance 5-7


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4. See Figure 5-1. Clean the nozzle bore by using a pin-type probe.The Nordson Corporation nozzle cleaning kit includes the holder anda variety of probes.

5. Reinstall the nozzle and retaining nut onto the gun.

6. Remove the drain pan and restore the system to normal operation.

Fig. 5-1 Using a Probe to Clean theGun Nozzle (Typical)

Maintenance5-8


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Section 6

Troubleshooting

Troubleshooting6-0


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Troubleshooting 6-1


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Section 6Troubleshooting


This section includes fault isolation and correction procedures forproblems that can occur during operation of the Series H-20 gun.

The procedures are presented in charts that list the problems, possiblecauses, and corrective actions.

During the daily visual inspection, correct obvious causes of malfunction,such as broken or missing electrical pins or wires or damaged hoseplugs.

Note that a problem may have more than one possible cause. Therefore,refer to all charts before beginning to correct a problem.

H-20 gun wiring diagrams are located at the end of this section for yourreference when disconnecting and reconnecting heater, thermostat, andcordset leads.

Table 6-1 Electrical Troubleshooting Procedures

Problem Page

1. No or little adhesive output 6-3

2. Gun does not heat or heats only slightly 6-4

Table 6-2 Hydraulic Troubleshooting Procedures

Problem Page


2. Adhesive leaks from module nozzle 6-8

3. Adhesive leaking at hose connection(s) 6-8

1. Introduction

Troubleshooting6-2


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Issued 3/0242-H20-MA-03

Table 6-3 Pneumatic Troubleshooting Procedures

Problem Page


2. Adhesive leaks from module nozzle 6-8

Table 6-4 Adhesive Application Troubleshooting Procedures

Problem Page

1. Adhesive spitting on extrusion 6-9

2. Waviness in bead deposit 6-9

3. Excessive adhesive at beginning of bead 6-9

4. Excessive adhesive at end of bead 6-9

5. Adhesive stringing at cut-off 6-10

6. Adhesive drooling from gun 6-10

7. Adhesive bouncing or splashing from substrate 6-10

8. Adhesive fuming or smoking 6-10

9. Adhesive charring in system 6-11

10. Adhesive gels 6-11

11. Adhesive not penetrating substrate 6-12

12. Unequal deposits between nozzles in multi-moduleinstallations

6-12

13. Container pops open after leaving compressionsection

6-13

1. Introduction (contd)

Troubleshooting 6-3


104449F02

Issued 3/0242-H20-MA-03

The following chart contains electrical troubleshooting procedures.

Problem Possible Cause Corrective Action

1. No or little adhesiveoutput

No power to the hot melt unit Check that input power to the hot meltunit is connected and the maindisconnect switch is ON.

Gun does not heat or heats onlyslightly

Refer to the Gun does not heat or heatsonly slightly problem in this chart.

Temperature settings of one or morechannels are too low for the adhesive

Reset the temperatures as necessary.

Electrical fault with hot melt unit pump Troubleshoot the hot melt unit pump.

Faulty hose heater (hose is cold oronly slightly warm)

Troubleshoot the hose per hose manualinstructions.

Triggering device not working or notset correctly

Troubleshoot triggering device.

Electrical fault with solenoid valve Verify faulty solenoid:

1. Bring the gun to applicationtemperature.

2. Ensure that power to the solenoid ison.

3. Manually trigger the solenoid.

4. If the gun works, replace thesolenoid.

5. If the gun still fails, rebuild or replacethe gun.

2. ElectricalTroubleshootingProcedures

Troubleshooting6-4


104449F02

Issued 3/0242-H20-MA-03


2. Gun does not heat orheats only slightly

No power to hot melt unit Check that input power to the hot meltunit is connected and the maindisconnect switch is on.

No power to gun heaters at hot meltunit hose cordset socket

Troubleshoot hot melt unit.

Failed hose cordset Use the Nordson Hose/Gun DiagnosticDevice (refer to Miscellaneous SpareParts and Service Kits in the Partssection for the part number) to verifyfailed hose cordse. If this is notavailable, use the following procedure:

1. Switch off the hot melt unit.

2. Disconnect input power from the hotmelt unit.

3. Unplug the hose cordset from thehot melt unit.

4. Unplug the gun cordset from thehose.

5. Locate the gun heater pin pairs inthe hose cordset plug and the socketat the other end of the hose.

6. Check each pair of gun heater pinpairs for continuity.

7. Locate the gun temperature sensorpin pairs in the hose cordset plugand the socket at the other end ofthe hose.

8. Check the gun temperature sensorpin pairs for continuity.

9. Replace the hose if any pin pairsindicate no continuity.

2. ElectricalTroubleshootingProcedures (contd)

Troubleshooting 6-5


104449F02

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2. Gun does not heat orheats only slightly (contd.)

Failed gun cordset Use the Nordson Hose/Gun DiagnosticDevice (refer to Miscellaneous SpareParts and Service Kits in the Partssection for the part number) to verifyfailed gun cordset. If this is notavailable, use the following procedure:

1. With the gun cordset unplugged fromthe hose socket, remove the screwsthat secure the electrical cover to thegun service block, then slide backthe cover to expose the wiringconnections.

2. Disconnect the cordset leads fromthe heater leads and thermostat(if present).

3. Locate the heater pin pairs at eachend of the gun cordset.

4. Check each pair of gun heater pinpairs for continuity. No continuityindicates a failed cordset.

5. (RTD guns) Locate the gun RTD pinpair in the gun cordset plug.

6. Check the gun RTD pin pair forcorrect resistance value using amultimeter.

7. Figure 6-1 shows a graph of nickeland platinum RTD resistance valuesfor you to use in checking the RTDpin pair.

8. Replace the cordset as described inthe Repair section if any pin pairsfail.

Troubleshooting6-6


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Issued 3/0242-H20-MA-03


2. Gun does not heat orheats only slightly (contd.)

Failed heater(s) Verify failed heater. With the heaterleads disconnected from the cordset(and thermostat, if present), check eachpair of heater leads for continuity. Nocontinuity indicates a faulty heater.

Replace faulty heater(s) as described inthe Repair section.

Failed thermostat Verify failed thermostat:

1. Touch one probe of the voltagetester to a heater/thermostatconnection and other probe of thevoltage tester to the powerlead/thermostat connection.

2. Apply input power.

3. The voltage tester reading should be0 until the thermostat opens at itsrated temperature.

4. If the thermostat opens beforereaching its rated temperature,disconnect and lock out input powerand replace the thermostat asdescribed in the Repair section.

2. ElectricalTroubleshootingProcedures (contd)

Troubleshooting 6-7


104449F02

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TEMPERATURE IN �F

4110683

364

205200195190185180175170165160155150145140135130125120115110105100

32 68 104 140 176 212 248 284 320 356 392 428 464

RE

SIS

TAN

CE

IN

OH

MS

0 20 40 60 80 100 120 140 160 180 200 220 240

32 68 104 140 176 212 248 284 320 356 392 428 464

0 20 40 60 80 100 120 140 160 180 200 220 240

PLATINUM RTD

NICKEL RTD

352

340328

316304292280268256244232220208

196184172160148136120

124

RE

SIS

TAN

CE

IN

OH

MS

TEMPERATURE IN �CTEMPERATURE IN �C

TEMPERATURE IN �CTEMPERATURE IN �C

TEMPERATURE IN �F

Fig. 6-1 Graph of Nickel RTD (top) and Platinum RTD (bottom Resistance Values)

Troubleshooting6-8


104449F02

Issued 3/0242-H20-MA-03

The following chart contains hydraulic troubleshooting procedures.



Clogged nozzle Clean the nozzle as described in theMaintenance section.

Filter screen blocked (if present) Clean the filter screen as described inthe Maintenance section.

Contamination at the ball and seat(or needle and seat in micro-adjustmodules)

Remove the seat from the module, thenclean the ball (or needle) tip and seat.

2. Adhesive leaks frommodule nozzle

Faulty module ball & seat assembly Remove the seat from the module, thenclean the ball (or needle) tip and seat .If problem continues, replace themodule.

3. Adhesive leaking athose connection(s)

Loose or cross-threaded connection Undo, then redo hose connection asdescribed in the Maintenance sectionunder Inspecting the Hose HydraulicConnections.

Faulty hose connector O-ring Replace the faulty hose connectorO-ring as described in the Repairsection.

The following chart contains pneumatic troubleshooting procedures.



Module not completely opening Ensure that input air pressure to thesolenoid is 276–483 kPa (40–70 psi).

Failed module air piston assembly Rebuild or replace the module.

2. Adhesive leaks frommodule nozzle

Module air piston not closing Ensure that air supply to module is fullyoff when the solenoid is not triggered.

3. HydraulicTroubleshootingProcedures

4. PneumaticTroubleshootingProcedures

Troubleshooting 6-9


104449F02

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The following chart contains adhesive application troubleshootingprocedures.


1. Adhesive spitting onextrusion

Adhesive in hot melt unit tank orreservoir is cold or material level islow or depleted and pump is drawingin air

If material level is cold, raise tank orreservoir setpoint; if material level is low,refill as required.

Hydraulic pressure set belowrecommended minimum

Increase hydraulic pressure at hot meltunit (refer to hot melt unit manual).

Adhesive output exceeds maximumcontinuous delivery rate of system

Reduce output to stated specification(refer to hot melt unit manual).

2. Waviness in beaddeposit

Setpoint too low Increase setpoint temperature torecommended application temperature.

Ambient temperature too low in workarea

Ensure ambient temperature in workarea is 0 �C to 50 �C (32 �F to 120 �F).

Gun and nozzle subject to draft orbreeze

Prevent draft or breeze at gun andnozzle.

Nozzle too far from substrate Reposition nozzle closer to substrate.Recommended nozzle-to-substratedistance is 13 mm (0.50 in.).

3. Excessive adhesive atbeginning of bead

Hydraulic pressure too high Lower hydraulic pressure at hot melt unitas required.

Nozzle too large for application,resulting in excessive instantaneousdelivery rate

Replace the nozzle as described in theMaintenance section with one of theproper size orifice.

Partially clogged nozzle Clean or replace nozzle as described inthe Maintenance section.

Insufficient air pressure to gun Increase air pressure to gun as required.

4. Excessive adhesive atend of bead

Hydraulic pressure too low Increase hydraulic pressure at hot meltunit as required.

Adhesive too cold Raise gun, hose, and hot melt unitsetpoint temperatures as required.

Insufficient air pressure to gun Increase air pressure to gun as required.

5. Adhesive ApplicationTroubleshootingProcedures

Troubleshooting6-10


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5. Adhesive stringing atcut-off

Nozzle too far from substrate Reposition nozzle closer to substrate.Recommended nozzle-to-substrateDistance is 13 mm (0.50 in.).

Adhesive too viscous Increase temperature slightly or changeto compatible adhesive with lowerviscosity.

Adhesive too cold Raise gun, hose, and hot melt unitsetpoint temperatures as required.

Gun speed too slow Use an air-piloted relay valve betweensolenoid and gun, or reduce distancebetween solenoid and gun.

Adhesive too old Flush system and refill with freshadhesive.

Gun temperature too low Increase gun temperature as required.

6. Adhesive drooling fromgun

Module spring force too low Adjust module spring force as required(micro-adjust H-20 modules only).

Ball or needle and seat of gunmodule worn or partially clogged bychar

Clean or replace gun module asdescribed in the Repair section.

7. Adhesive bouncing orsplashing fromsubstrate

Adhesive too hot Decrease gun, hose, and hot melt unitsetpoint temperatures as required.

Hydraulic pressure too high Decrease hydraulic pressure at hot meltunit as required.

Adhesive viscosity too low Decrease temperature slightly or changeto compatible adhesive with higherviscosity.

Nozzle diameter too small Change to larger diameter nozzle asdescribed in the Maintenance section.

8. Adhesive fuming orsmoking

Temperature setpoints too high Lower system setpoints as required.

Use of unstable adhesive Flush system and refill with differentadhesive.

5. Adhesive ApplicationTroubleshootingProcedures (contd)

Troubleshooting 6-11


104449F02

Issued 3/0242-H20-MA-03

Problem Corrective ActionPossible Cause

9. Adhesive charring insystem

Temperature setpoints too high Lower setpoints as required.

Overheating in gun, hose or hot meltunit component.

Troubleshoot system to locate andrepair overheating component.

Adhesive level kept too low Keep adhesive level higher in hot meltunit.

Adhesive oxidizing in hot melt unittank

Keep hot melt unit tank lid closed duringoperation. If problem persists, changeto different adhesive or switch to hotmelt unit equipped with nitrogen blanket.

Adhesive kept at applicationtemperature during long period of lowactivity

Reduce gun, hose, and hot melt unittemperatures slightly during prolongedhold situations.

10. Adhesive gels System not properly flushed beforechanging to new adhesive

Attempt to pump remaining adhesivefrom system, then properly flush thesystem and refill with fresh adhesive.

Type-R fluid used to flush systempreviously used with Polyamide,Surlyn, Polyester, or certain otherhigh performance hot melt material

Attempt to pump remaining adhesivefrom system, then properly flush thesystem with compatible flushing agent(consult with adhesive manufacturer forrecommendations).

Adhesive heated for too long Do not heat adhesive longer thanrecommended pot life of adhesive;reduce gun, hose, and hot melt unittemperatures slightly during prolongedhold situations.

Adhesive heated at too high atemperature

Reduce adhesive temperature or consultwith adhesive manufacturer aboutrecommended adhesive temperaturerange.

Troubleshooting6-12


104449F02

Issued 3/0242-H20-MA-03


11. Adhesive notpenetrating substrate

Adhesive not hot enough Increase channel setpoints slightly.

Special coating on substrate Increase system setpoints slightly. Ifcondition persists, check with adhesivemanufacturer for compatible adhesive.

Not enough adhesive being applied Use higher flow-rated nozzle, increasesystem temperatures slightly, orincrease hydraulic pressure at the hotmelt unit pump.

Adhesive too viscous or gelled Increase temperature slightly or changeto compatible adhesive with lowerviscosity.

12. Unequal depositsbetween nozzles inmulti-moduleinstallations

Different nozzle sizes used onseveral modules

Use same size nozzles.

Unequal spring force Adjust module spring force as required(micro-adjust H-20 modules only).

Nozzle clogged or damaged Clean or replace gun nozzle asdescribed in the Maintenance section.

Foreign material in gun module Rebuild or replace module as describedin the Repair section.

Unequal hydraulic pressure at guns Compensate for difference by usingdifferent nozzle sizes or adjusting guntravel.

Adhesive in air piston section ofmodule

Rebuild or replace module as describedin the Repair section.




104449F02

Issued 3/0242-H20-MA-03

Problem Corrective ActionPossible Cause

13. Container pops openafter leavingcompression section

Adhesive not cooling fast enough 1. Decrease bead size.

2. Decrease adhesive temperatureslightly.

3. Increase nozzle-to-substratedistance.

4. Increase distance between beaddeposit and bead compression

5. Increase length of compressionsection.

6. Reduce line speed throughcompression section.

7. Cool the substrate.

8. Use lower flow-rated nozzle, or usestitched bead pattern.

Adhesive open time too long Use an adhesive with shorter open timeor reduce application temperatureslightly.

Adhesive cooling too fast 1. Increase bead size.

2. Increase adhesive temperatureslightly.

3. Decrease nozzle-to-substratedistance.

4. Decrease distance between beaddeposit and bead compression.

5. Decrease length of compressionsection.

6. Raise line speed throughcompression section.

7. Heat the substrate.

8. Use higher flow-rated nozzle.

Troubleshooting6-14


104449F02

Issued 3/0242-H20-MA-03


13. Container pops openafter leaving compressionsection (contd.)

Adhesive cooling too fast (contd.) 9. Increase bead length and avoidstitched bead pattern.

10. Protect bead deposit and/or gunfrom cold or moving air.

Adhesive open time too short Use an adhesive with longer open timeor increase application temperatureslightly.

Shearing of adhesive deposit Check for twisting,compression/relaxing/more compressionor other adverse movement in thecompression section. If movementthrough compression is smooth, checkwith adhesive manufacturer.

Insufficient compression force Increase compression force as required.

Insufficient hot tack Change to new batch or differentformulation of adhesive.




104449F02

Issued 3/0242-H20-MA-03

Follow these steps to perform an air supply operational check when thehydraulic pressure is on.

1. Bring system to operating temperature and turn on the air supply tothe gun solenoid.

2. Shield the area and operator.

3. Trigger the gun.

4. If adhesive flows from the gun module, return the system to normaloperation.

5. If no adhesive flows, manually trigger the solenoid.

6. If you hear the clicking sound of the solenoid engaging, return thesystem to normal operation.

7. If you hear no clicking sound, either there is an electrical problem withthe solenoid or insufficient air pressure to the solenoid. Perform thenext procedure.

Follow these steps to perform an air supply operational check when thehydraulic pressure is off.

1. Relieve system pressure as described in the Installation section.

2. Disconnect the solenoid valve air line from the regulator.

3. Slowly increase the regulator air pressure.

If no air flows from the regulator, it is defective. Replace the regulatorand restore the system to normal operation.

If air does flow from the regulator, the initial air pressure may have beentoo low. Check input line air pressure and ensure that the air pressure is276–483 kPa (40–70 psi).

6. Air Supply OperationalCheck (hydraulicpressure on)

7. Air Supply OperationalCheck (hydraulicpressure off)

Troubleshooting6-16


104449F02

Issued 3/0242-H20-MA-03

Follow these steps to perform a solenoid valve electrical check.

1. Disconnect wires to the solenoid.

2. Use a standard ohmmeter to check the solenoid coil for continuity. Ifno continuity is found, replace the solenoid. If continuity is found,perform step 3.

3. Check the solenoid to ensure that it meets high temperaturespecifications. The solenoids listed below are the only ones withvalues currently modified for service temperatures above 85 �C(185�F). Refer to the Parts section for solenoid part numbers.

Table 6-5 Solenoids: Pneumatic 3-Way Valves

Nordson Solenoid Description CV Watts Amps

24 Vdc, QD, 1/8 in. 0.5 2.9 0.12

1209 Vdc, QD, 1/8 in. 0.5 3.1 0.03

24 Vdc, QD, 1/4 in. 1.2 2.9 0.12

120 Vdc, QD, 1/4 in. 1.2 3.1 0.03

240 Vdc, QD, 1/4 in. 1.2 3.1 0.01

Mac Solenoid Description CV Watts Amps

24 Vdc, QD, 1/8 in. 0.18 6 0.25

Dual, 1/2 in. NPS Conduit, 1/8 in. 0.18 6 0.25

24 Vdc, 18 AWG (wire), 1/8 in. 0.18 6 0.25

24 Vdc, QD, 1/4 in. 0.5 24 1.0

Dual, QD, 1/4 in. 0.5 24 1.0

24 Vdc, 18 AWG (wire), 1/4 in. 0.5 24 1.0

240 Vac, 50/60 Hz, QD 1/4 in. 0.5 6.5 1.0

24 Vdc, QD, 1/4 in., Water-Resistant 0.5 24 1.0

NOTE: Check the timer current capacity rating against the valve rating. Dual-voltage solenoids (24 Vdc/120 Vac),while convenient, perform poorly compared to valves with discrete voltages. All the valves listed above havemodifications for high temperature operation.

8. Solenoid Valve ElectricalCheck



104449F02

Issued 3/0242-H20-MA-03

4202050

HEATER

RTD

Fig. 6-2 Typical H-20 Single Heater Wiring Diagram with RTD

4202036

HEATER

THERMOSTAT

Fig. 6-3 Typical H-20 Single Heater Wiring Diagram with Thermostat

9. Wiring Diagrams

Troubleshooting6-18


104449F02

Issued 3/0242-H20-MA-03

4202030

RTD

HEATER

HEATER

Fig. 6-4 Typical H-20 Dual-Heater Wiring Diagram with RTD

4202031

THERMOSTAT

HEATER

HEATER

Fig. 6-5 Typical H-20 Dual-Heater Wiring Diagram with Thermostat

9. Wiring Diagrams (contd)


104449F02

Issued 3/0242-H20-MA-03

Section 7

Repair

Repair7-0


104449F02

Issued 3/0242-H20-MA-03

Repair 7-1


104449F02

Issued 3/0242-H20-MA-03

Section 7Repair


This part of the manual describes repair and replacement procedures forthe Series H-20 automatic guns.

For maintenance procedures, such as filter flushing and filter cleaning,refer to the Maintenance section of this manual. For hot melt unitmaintenance procedures, refer to the manual for the hot melt unit.


CAUTION: Gun nozzles can be damaged if you use an opentorch, drill, or broach to clean a nozzle. Use only a pin-typeprobe to clean the nozzles. We recommend that you use theNordson Corporation nozzle cleaning kit.

Follow this procedure to remove an H-20 module from the gun serviceblock and install another one in its place.

See Figure 7-1.


2. Disconnect and lock out input power from the hot melt system.


3. Use a flat-blade screwdriver to remove the two screws (2) that securethe module (1) to the service block (4).

4. Remove the old module, then remove and discard the old O-rings (3).

1. Introduction


3. Replacing a Module

Repair7-2


104449F02

Issued 3/0242-H20-MA-03

4202068

1

3

3

42

Fig. 7-1 Replacing the H-20 Module and O-rings

1. Module2. Screw

3. O-ring4. Service block

5. Wipe any residual hot melt adhesive from the gun service blocksurface that mates with the module.

6. Coat a new pair of O-rings (3) with O-ring lubricant and place them intheir grooves in the gun service body.

7. Shield yourself from hot melt adhesive released under pressure, thentrigger the gun solenoid once or twice to clear any adhesive from theopen air channel in the gun service block (4).

8. Wipe any residual hot melt adhesive from the gun service block.

9. Apply a coating of anti-seize lubricant to the module screws (2).

10. Position the new module against the service block and secure it inplace with the two screws.

3. Replacing a Module(contd)

Repair 7-3


104449F02

Issued 3/0242-H20-MA-03

11. Torque both screws to 2.6 N•m (23 in.-lb).

12. Restore the system to normal operation, then torque both screwsonce more after the system has reached operating temperature.

Follow this procedure to remove a heater cartridge from an H-20 serviceblock and install a new one.

See Figures 7-2 or 7-3.




4202069

7

6

4

5

3

1

2

Fig. 7-2 H-20 gun Heater and Wire Connections with RTD (typical)

1. Screw2. Electrical cover3. Cordset4. Service block

5. Two-station terminal block6. Heater7. Temperature sensor

4. Replacing a Heater

Repair7-4


104449F02

Issued 3/0242-H20-MA-03

4202070

5

1

2

3

4

6

7

8

Fig. 7-3 H-20 Gun Heater and Wire Connections with Thermostat (typical)

1. Screw2. Electrical cover3. Cordset4. Service block

5. Two-station terminal block6. Heater7. Thermostat screw8. Thermostat

3. Use a flat-blade screwdriver to remove the two screws (1) that securethe electrical cover (2) to the service block (4).

4. Pull the electrical cover away from the gun service block only enoughto gain access to the heater (6) and its wire connections.

5. Disconnect the leads of the faulty heater from the thermostat (8)(if present) and cordset (3).

NOTE: H-20 gun wiring diagrams are located at the end of theTroubleshooting section for your reference.

NOTE: Filtered guns are equipped with two heaters, non-filtered gunshave only one heater. Refer to the Parts section of this manual for H-20gun parts lists and illustrations.

4. Replacing a Heater (contd)

Repair 7-5


104449F02

Issued 3/0242-H20-MA-03

6. If you are not sure if the heater is faulty, use an ohmmeter to checkthe heater for continuity as described in the Troubleshooting sectionunder Gun does not heat or heats only slightly. No continuity meansa faulty heater.

7. If the heater (6) tests faulty, remove it from the service block.

NOTE: Heating and cooling cycles may cause the heater to becomeseized inside its bore in the service block. In this case, tap on awooden dowel positioned against the flat face of the heater to forcethe heater out.

8. Insert the new heater (6) in its bore in the service block.

9. Connect the heater leads to the thermostat (8) (if present) andcordset (3).

10. Reinstall the electrical cover (2) with the enclosure screws (1).

11. Restore electrical power to the system, then resume normaloperation.

Repair7-6


104449F02

Issued 3/0242-H20-MA-03

Follow this procedure to remove a faulty thermostat from an H-20 serviceblock and install a new one.

See Figure 7-3.




3. Use a flat-blade screwdriver to remove the two screws (1) that securethe electrical cover (2) to the service block (4).

4. Pull the electrical cover away from the gun service block only enoughto gain access to the thermostat (8) and its wire connections.

5. If you are not sure if the thermostat is faulty, use a voltage tester tocheck the thermostat as described in the Troubleshooting sectionunder Gun does not heat or heats only slightly.

6. If the thermostat tests faulty, remove the wire connectors, thendisconnect the leads of the faulty thermostat from the heater (6) andcordset (3) leads.

NOTE: H-20 gun wiring diagrams are located at the end of theTroubleshooting section for your reference.

7. Remove the thermostat screws (7) that secure the thermostat to theservice block (4), then lift the thermostat away.

8. Secure a new thermostat (7) to the service block.

9. Connect the thermostat leads to the heater (6) and cordset leadsusing the wire connectors removed in step 6.

10. Reinstall the electrical cover (2) with the screws (1).


5. Replacing a Thermostat

Repair 7-7


104449F02

Issued 3/0242-H20-MA-03

Follow this procedure to replace the cordset assembly.

NOTE: Nordson Corporation does offer a kit for replacement of a faultyRTD only. However, this requires cutting the sensor leads and using wireconnectors which may adversely affect sensor accuracy.

1. Relieve hydraulic pressure as described earlier in this section.



3. See Figure 7-2. Use a flat-blade screwdriver to remove the twoscrews (1) that secure the electrical cover (2) to the service block (4).

4. Pull the electrical cover away from the gun service block only enoughto gain access to the wire connections.

5. Disconnect the heater leads from the cordset leads.

NOTE: Refer to the H-20 gun wiring diagrams located in theTroubleshooting section.

NOTE: Filtered guns are equipped with two heaters, non-filtered gunshave only one heater. Refer to the Parts section for H-20 gun parts listsand illustrations.

6. Disconnect the ground wire from the gun service block.

7. See Figure 7-4. Pull the RTD (1) from its bore in the gun serviceblock.

8. Pull the cordset away with the electrical cover (5) attached.

9. Remove the hex nut (2) and washer (3) from the old cordsetconnector (6), then remove the electrical cover.

10. Thread the new RTD and cordset leads (4) through the electricalcover, hex nut and washer.

6. Replacing the RTD andCordset Assembly

Repair7-8


104449F02

Issued 3/0242-H20-MA-03

4202071

21 3 4

5

6

Fig. 7-4 Replacing the RTD Cordset Assembly

1. RTD2. Hex nut3. Washer

4. Cordset leads5. Electrical cover6. Cordset connector

11. Install the hex nut and washer onto the new cordset connector.

12. Connect the ground wire to its terminal on the gun service block

13. Connect the heater leads to the new cordset heater leads.

14. Insert the new RTD into its bore in the gun service block.

15. Reinstall the electrical cover on the gun service block.


6. Replacing the RTD andCordset Assembly (contd)

Repair 7-9


104449F02

Issued 3/0242-H20-MA-03

Follow this procedure to replace a faulty hose connector O-ring.

1. Relieve hydraulic pressure as detailed earlier in this section.


3. Use two wrenches to disconnect the hose swivel fitting from either thehot melt unit O-ring connector or the gun O-ring connector, whicheveris appropriate for your situation. Refer to Table 7-1 for the correctwrench size for your application.

NOTE: If you are replacing only the O-ring at the hot melt unit end ofthe hose, unplug the hose cordset from the hot melt unit. If you arereplacing only the O-ring at the gun end of the hose, unplug the guncordset from the hose.

Table 7-1 Hose Connector Wrench Sizes

Hose ID Size O-Ring Connector Wrench Size Hose Swivel Fitting Wrench Size

8 mm (5/16 in.) 16 mm (5/8 in.) 18 mm (11/16 in.)

16 mm (5/8 in.) 32 mm (1 1/4 in.) 32 mm (1 1/4 in.)

4. Remove the O-ring connector, then replace the old O-ring with a newone.

5. Reinstall the O-ring connector.

6. Plug the gun cordset back into its socket at the end of the hose orplug the hose cordset back into the hot melt unit electrical enclosuresocket.

7. Restore electrical power to the hot melt system.


9. Use the two wrenches to connect the hose swivel fitting onto theO-ring connector. Do not overtighten the connection.

10. Check for leakage. Retighten the fittings as necessary. If no leaksoccur, resume normal operation.

NOTE: Severe leakage at a hose hydraulic connection can indicatethe use of incorrect O-rings or missing or damaged O-rings. Checkfor correct parts or for missing or damaged O-rings.

7. Replacing a HoseConnector O-ring

Repair7-10


104449F02

Issued 3/0242-H20-MA-03


104449F02

Issued 3/0242-H20-MA-03

Section 8

Parts

Parts8-0


104449F02

Issued 3/0242-H20-MA-03

Parts 8-1


104449F02

Issued 3/0242-H20-MA-03

Section 8Parts

To order parts, call the Nordson Customer Service Center or your localNordson representative. Use this five-column parts list, and theaccompanying illustration, to describe and locate parts correctly.

Numbers in the Item column correspond to numbers that identify parts inillustrations following each parts list. The code NS (not shown) indicatesthat a listed part is not illustrated. A dash (—) is used when the partnumber applies to all parts in the illustration.

The six-digit number in the Part column is the Nordson Corporation partnumber. A series of dashes in this column (- - - - - -) means the partcannot be ordered separately.

The Description column gives the part name, as well as its dimensionsand other characteristics when appropriate. Indentions show therelationships between assemblies, subassemblies, and parts.

Item Part Description Quantity Note

— 000 000 Assembly 1

1 000 000 � Subassembly 2 A

2 000 000 � � Part 1

� If you order the assembly, items 1 and 2 will be included.� If you order item 1, item 2 will be included.� If you order item 2, you will receive item 2 only.

The number in the Quantity column is the quantity required per unit,assembly, or subassembly. The code AR (As Required) is used if thepart number is a bulk item ordered in quantities or if the quantity perassembly depends on the product version or model.

Letters in the Note column refer to notes at the end of each parts list.Notes contain important information about usage and ordering. Specialattention should be given to notes.

1. Introduction

Using the Illustrated PartsList

Parts8-2


104449F02

Issued 3/0242-H20-MA-03

See Figure 8-1.


— 274 702 H-20 Non-filtered Automatic Gun with RTD —

1 981 244 2 A

2 153 041 1

3 153 037 1

4 973 125 1 A

5 939 586 1

6 984 155 1

7 983 161 1

8 153 035 1

9 223 801 1

10 981 000 1

11 983 505 1

12 981 141 2

13 972 657 1 B

14 945 032 1

15 274 705 1

16 973 574 2 B

17 938 053 1

18 152 290 1 A

19 - - - - - - 1 C

20 153 030 2 A

21 940 101 2

22 973 402 1

23 152 683 2

24 981 405

� Screw, fillister, slotted, 1/4-20 x 1.25, zinc

� Block, mounting

� Insulator, mounting block

� Elbow, pipe, 1/8, brass

� Connector, plastic, 2-station

� Nut, panel mounting

� Lockwasher, E, external, 3/8, steel, zinc

� Cover, electrical

� Cordset assembly, series 2300-with eyelet

� Screw, fillister, 5-40 x 0.25, slotted, zinc

� Lockwasher, E, split, #5, steel, zinc

� Screw, pan, 10-32 x 0.25, slotted, zinc

� Connector with O-ring, hose, 9/16-18

� � O-ring, Viton, 0.38-in. tube

� Block, service, single-module

� Plug, O-ring, straight thread, 9/16-18

� Heater, 240 Vac, 147 watt, 0.50 x 1.203 in.

� Nut, retaining

� Module, H-20 gun

� Screw, special, 1/4-20

� O-ring, Viton, 0.239-in. ID x 0.07-in. wide, brown

� Plug, pipe, socket, flush, 1/8, zinc

� Sleeve

� Set screw, square, 3/8-16 x 0.750, cup, zinc 1

NOTE A: Apply pipe adhesive part, 900 481.

B: Apply anti-seize compound part, 900 341.

C: Refer to separate parts lists later in this section.

2. H-20 Non-FilteredAutomatic Gun

Parts 8-3


104449F02

Issued 3/0242-H20-MA-03

4202072

5

1

2

3

4

6

7

8

10

11

12

13

14

1516

17

18

19

20

21

23

22

24

9

Fig. 8-1 Non-Filtered Automatic Gun with RTD (Typical)

Parts8-4


104449F02

Issued 3/0242-H20-MA-03

See Figure 8-2.


— 815 138 H-20 filtered automatic gun with RTD —

1 276 754 � Filter assembly 1 A

2 981 176 � Screw, pan, slotted, 10-32 x 10.50, zinc 2

3 981 239 � Screw, cap, hex head, 1/4-20 x 0.50, zinc 2

4 276 756 � Block, mounting 1

5 276 755 � Insulator, mounting block 1

6 - - - - - - � RTD (part of cordset, item 14) 1

7 983 505 � Lockwasher, E, split, #5 1

8 981 000 � Screw, fillister, slotted, 5-40 x 0.25, zinc 1

9 984 155 � Nut, panel mounting 1

10 983 161 � Lockwasher, E, external, 3/8, zinc 1

11 223 801 � Cordset assembly, series 2300-style 1

12 276 760 � Cover, electrical 1


14 972 628 � Connector with O-ring, hose, 9/16-18 1 B

15 945 032 � � O-ring, Viton, 0.38-in. tube 1

16 271 484 � Valve, drain 1 C

17 276 761 � Block service, H-20, filter-type, single-module 1

18 973 577 � Plug, pipe, socket, standard, 1/16, zinc 1 D, E

19 973 402 � Plug, pipe, socket, flush, 1/8, zinc 2 D, E

20 973 574 � Plug, O-ring, straight thread, 9/16-18 2 D

21 - - - - - - � Module, gun, H-20 1 A

22 938 159 � Heater, cartridge, 240 Vac, 130 watt, 0.375 in. x 3.25 in. 2

23 276 757 � Cover, heater 1


NOTE A: Refer to separate parts lists later in this section.

B: Apply anti-seize compound part, 900 348. C: Apply PTFE paste sealant part, 900 236. D: Apply pipe adhesive part, 900 481.

E: Apply Locquic N Primer.

3. H-20 Filtered AutomaticGun Parts List

Parts 8-5


104449F02

Issued 3/0242-H20-MA-03

22

4202073

1

2

3

4

5

6

9

10

12

11

8

7

13

14

16

15

17181920

21

24

23

Fig. 8-2 H-20 Filtered Automatic Gun with RTD (Typical)

Parts8-6


104449F02

Issued 3/0242-H20-MA-03

See Figure 8-3.


— 276 754 Filter assembly —


2 161 130 � Screen, filter 1 A

3 504 146 � Core, filter 1

4 276 758 � Bung, filter 1

5 941 172 � O-ring, Viton, 0.813 x 1.00 x.0.094-in. 1

NOTE A: Refer to list of optional screen mesh sizes later in this section.

4110165

1

2

3

5

4

Fig. 8-3 Adhesive Filter Assembly

4. Adhesive Filter Assembly

Parts 8-7


104449F02

Issued 3/0242-H20-MA-03

See Figure 8-4.


— 153 011 Module, H-20, standard —

1 140 469 � Screw with washer, 10-32 x 1.00 4

2 983 120 � � Lockwasher , E, split #10, steel 4

3 153 028 � Cylinder 1

4 984 539 � Nut, lock, 10-32, upper 1 A

5 179 445 � Piston, locknut assembly 1

6 240 274 � � Nut, seal lock 1

7 940 090 � � O-ring, Viton, 0.208 ID x 0.070 W 1

8 153 031 � Gasket, gun, H20 1

9 940 151 � O-ring, Viton, 0.563 x 0.688 x 0.063 1

10 153 027 � Body, module, gun, H-20 1

11 153 030 � Screw, 1/4-20, special 2

12 940 101 � O-ring, Viton, 0.239 ID x 0.070 W 2

13 981 115 � Screw, oval, 10-32 x 0.500, slotted, zinc 4

14 152 290 � Nut, retaining 1

15 241 109 � Ball tip & and seat assembly 1

16 940 151 � � O-ring, Viton, 0.563 x 0.688 x 0.063 1

17 153 012 � Cartridge assembly 1

18 152 934 � � Spring, compression, 0.970 x 0.390 OD x 0.062 1

19 153 013 � � Body, cartridge packing 1

20 940 133 � � O-ring, Viton 1

NOTE A: Apply item 8 to threaded portion of item 6.

5. Standard H-20 Module

Parts8-8


104449F02

Issued 3/0242-H20-MA-03

4202074

1

2

3

4

5

17

6

7

8

9

10

11

12

15

14 13

16

20

19

18

Fig. 8-4 Standard H-20 Module

5. Standard H-20 Module(contd)

Parts 8-9


104449F02

Issued 3/0242-H20-MA-03

See Figure 8-5.


— 272 549 Module with large ball and seat, H-20 —

1 140 469 � Screw with washer, 10-32 x 1.00 4

2 983 120 � � Lockwasher, E, split, #10, steel, nickel 4

3 274 314 � Cylinder, air, LBS 1

4 274 311 � � Screw, adjusting 1

5 981 101 � � Screw, socket set, 10-32 x 0.187, cup, zinc 2

6 984 539 � Locknut, 10-32, upper 1

7 179 445 � Assembly, piston/locknut 1

8 240 274 � � Nut, seal lock 1

9 940 090 � � O-ring, Viton, 0.208 x 0.070, brown 1

10 153 031 � Gasket, gun, H-20 1

11 940 151 � O-ring, Viton, 0.563 x 0.688 x 0.063 1

12 153 027 � Body, module gun, H-20 1

13 153 030 � Screw, special, 1/4�20 2

14 940 101 � O-ring, Viton, 0.239 x 0.070, brown 2

15 981 115 � Screw, oval, slotted, 10-32 x 0.50, zinc 4

16 152 290 � Nut, retaining, nozzle 1

17 272 273 � Assembly, ball, tip & seat, large passage 1


19 153 012 � Assembly, cartridge, packing 1 A


21 153 013 � � Body, cartridge 1


NOTE A: Apply compound threadlocking part, 900 424.

6. H-20 LBS Module

Parts8-10


104449F02

Issued 3/0242-H20-MA-03

4202075

1

2

6

7

19

8

9

10

11

12

13

14

17

16 15

18

22

21

20

35

4

Fig. 8-5 H-20 LBS Module

6. H-20 LBS Module PartsList (contd)

Parts 8-11


104449F02

Issued 3/0242-H20-MA-03

See Figure 8-6.


— 272 267 Module with micro-adjust, H-20 — —

1 272 053 � Screw, adjustable 1 A


3 984 207 � Nut, lock, 3/8 x 40 1

4 983 120 � Lockwasher, E, split, #10, steel, nickel 4

5 272 052 � Cylinder, air, special 1

6 984 539 � Locknut, upper, 10-32 1

7 179 445 � Assembly, piston/locknut 1

8 240 274 � � Nut, seal lock 1


10 153 031 � Gasket, gun, H-20 1

11 940 151 � O-ring, Viton, 0.563 x 0.688 x 0.063 1

12 153 027 � Body, module gun, H-20 1

13 153 030 � Screw, special, 1/4-20 2

14 940 101 � O-ring, Viton, 0.239 x 0.070, brown 2

15 981 115 � Screw, oval, 10-32 x 0.50, slotted, zinc 4

16 152 290 � Nut, retaining 1

17 272 263 � Assembly, needle & seat 1

18 940 181 � � O-ring, Viton, 0.563 x 0.688 x 0.63 1

19 153 012 � Assembly, cartridge, packing 1 B


21 153 013 � � Body, cartridge 1


NOTE A: Apply Anti-Seize lubricant part, 900 348 to the threads of item 1.

B: Apply compound threadlocking part, 900 424 to item 18.

7. H-20 Micro-AdjustModule

Parts8-12


104449F02

Issued 3/0242-H20-MA-03

4202076

2

4

5

6

7

19

8

9

10

11

12

13

14

17

16 15

18

22

21

20

1

3

Fig. 8-6 H-20 Module with Micro-Adjust

7. H-20 Micro-AdjustModule (contd)

Parts 8-13


104449F02

Issued 3/0242-H20-MA-03

Part Description

804 839 55 �C (130 �F)

804 837 65 �C (150 �F)

804 836 80 �C (175 �F)

804 835 95 �C (200 �F)

271 933 105 �C (220 �F)

271 934 120 �C (250 �F)

271 935 135 �C (275 �F)

271 936 150 �C (300 �F)

271 928 165 �C (325 �F)

271 929 175 �C (350 �F)

271 930 190 �C (375 �F)

271 931 205 �C (400 �F)

271 932 220 �C (425 �F)

271 937 230 �C (450 �F)

Part Description

161 133 Screen, Filter, 0.004-in.



Hole Size Mesh Microns

0.004-in. 50 x 250 400

0.006-in. 70 x 80 140

0.009-in. 60 x 60 230

8. Optional Thermostats

9. Optional Filter Screens

Parts8-14


104449F02

Issued 3/0242-H20-MA-03

The following lists contain spare parts and service kits that may beneeded for the H-20 Automatic Gun.

Part Description

132 426 Hose/gun diagnostic device

902 514 Safety gloves

901 254 Gauge, 0–690 kPa (0–100 psi), 1/8 NPT

274 783 Sensor, temperature, RTD

900 348 Anti-Seize lubricant

900 424 Compound threadlocking

Part Description

153 057 Repair kit, seal

272 051 Service kit, micro-adjust mechanism, H-20

901 915 Nozzle cleaning kit

276 167 Service kit, body, gun, H-20

Part Description

272 720 Mounting block, RTD, H-20

153 033 Block, service, H-20A, 240 Vac

153 046 Block, service, H-20B, 120 Vac

273 552 Block, service, H-20C, 240 Vac

153 040 Mounting block with sleeve

10.Spare Parts and ServiceKits

Recommended Spare Parts

Service Kits

Mounting Block

Parts 8-15


104449F02

Issued 3/0242-H20-MA-03

Part Description

274 179 Service kit, 45� hose connector

130 796 Connector assembly, swivel

972 646 Connector assembly, 90�, 9/16-18 x 9/16-18

972 647 Connector, 45�, hose, 9/16-18 x 9/16-18

972 657 Connector with O-ring, hose, 9/16-18

972 626 Elbow, male, 37, 9/16-18 x 1/4-18

Part Description

938 144 Heater, cartridge, 0.50 x , 1.28, 180 watt, 240 Vac





271 177 Kit, heater, replacement, 150 watt x 2.00-in.

Part Description

242 567 Kit, armored cordset, retrofit

242 870 Kit, armored cordset, retrofit

244 060 Kit, service, cordset

273 486 Service kit, replacement, holder, cordset, auto

242 077 Cordset, standard, thermostat-type

273 906 Cordset, series 2000

274 685 Cordset, RTD-type, series 2300/3000

276 770 Cordset, RTD-type, water-wash

152 127 Kit, service, cordset, series 3000-to-Meltex conversion

264 829 Kit, service, cordset, Meltex-to-Series 3000 conversion

Connector Assembly

Heater Cartridges

Cordset

Parts8-16


104449F02

Issued 3/0242-H20-MA-03

Part Description

274 290 Filter, nonheated, in-line, straight, 50 mesh (297-microns, 0.0117-in.)

274 989 Filter, nonheated, in-line, 45�, 50 mesh (297-microns, 0.0117-in.)


274 291 Filter, nonheated, in-line, straight, 100 mesh (149-microns, 0.0059-in.)



274 292 Filter, nonheated, in-line, Straight, 200 mesh (74-microns, 0.0029-in.)



901 513 Filter/regulator, 1/4 NPT

Part Description

271 598 Screen, nonheated, in-line, 50 mesh



Filters

Screens

Parts 8-17


104449F02

Issued 3/0242-H20-MA-03

See Figure 8-7

Item Part Description

1 111 940 Service kit, corrugated hose

2 271 486 Holder, hose

3 274 174 Hanger, hose, 5/8 & 1-1/8 BM

4202077

1

2

3

Fig. 8-7 Hose Installation Accessories

Hose Installation Accessories

Parts8-18


104449F02

Issued 3/0242-H20-MA-03

See Figures 8-8–8-11

232 XXX (1)

Singleorifice with

insert

Engagement

mm (in.)

Orifice Diametermm (in.)

0.20(0.008)

0.25(0.010)

0.31(0.012)

0.36(0.014)

0.41(0.016)

0.46(0.018)

0.51(0.020)

0.61(0.024)

Brassadapter,stainless-steel insert (2)

1.3 (0.050) 232 000 232 001 232 003 232 007 232 011 232 015 232 019 232 023

1.9 (0.075) 232 002 232 004 232 008 232 012 232 016 232 020 232 024

2.5 (0.100) 232 005 232 009 232 013 232 017 232 021 232 025

3.8 (0.150) 232 006 232 010 232 014 232 018 232 022 232 026

(1) Nordson recommends 232 XXX nozzles for all applications except those requiring the nozzle guard feature of 231 XXXnozzles.(2) Use with retainer part, 152 290.

232 XXX (1)

Long Engagement,Single Orifice with

Insert

Engagementmm (in.)


0.31(0.012)

0.36(0.014)

0.41(0.016)

0.46(0.018)

0.53(0.021)

0.61(0.024)

0.71(0.029)

Brass adapter,stainless-steel insert (2)

7.6 (0.300) 226 727 226 728 226 729 226 730 226 731 226 732 226 733

(1) Nordson recommends 232 XXX nozzles for all applications except those requiring the nozzle guard feature of 231 XXXnozzles.

(2) Use with retainer part, 152 290.

4301005A

Fig. 8-8 232 XXX Single Orifice with Insert

11. H-20 Automatic GunNozzles

Parts 8-19


104449F02

Issued 3/0242-H20-MA-03

231 XXX

Single orificewith insert

Engagementmm (in.)


0.20(0.008)

0.25(0.010)

0.31(0.012)

0.36(0.014)

0.41(0.016)

0.46(0.018)

0.51(0.020)

Brass adapter,stainless-steelinsert (2)

1.3 (0.050) 231 208 231 210 231 212 231 214 231 216 231 218 231 220

1.9 (0.075) 231 621 231 312 231 314 231 316 231 318 231 320

2.5 (0.100) 231 412 231 414 231 416 231 418 231 420

3.8 (0.150) 231 612 231 614 231 616 231 618 231 620


231 XXX (1)

Long Engagement,Single Orifice with

Insert

Engagementmm (in.)


0.31(0.012)

0.36(0.014)

0.41(0.016)

0.46(0.018)

0.53(0.021)

0.61(0.024)

0.71(0.029)

Brass adapter,stainless-steel insert (2)

7.6 (0.300) 231 003 231 005 231 008 231 018 231 027 231 040 231 060


4202052

Fig. 8-9 Single Orifice with Insert

Parts8-20


104449F02

Issued 3/0242-H20-MA-03

220 XXX Domed Nozzles

Orifice Diameter mm (in.)

0.20

(0.008)

0.25

(0.010)

0.31(0.012)

0.36(0.014)

0.41(0.016)

0.46(0.018)

0.51(0.020)

Phosphor bronze (1)

Dual 16� 132 488 220 019 705 831 220 053 703 684

Dual 24� 709 983 220 009 705 205 220 045

Dual 30� 702 681 703 661 220 007 220 067 702 948 706 743 808 255

Dual 45� 220 000 220 001 220 002 220 003 220 004 220 005 220 006

Dual 60� 712 230 712 231 703 669 220 046 220 047

Triple 30� 220 048 704 115 220 049 804 487

Triple 45� 220 010 220 011 220 012 220 013 220 014 220 015 220 016

Triple 60� 704 380 220 050 100 651 220 051

Radial Triple 22.5� 704 113 220 034 703 469 804 760 220 052

Quad 35/76� 220 020 220 021 220 022 220 023 220 024 220 025 220 026

Steel, black oxide coated (1)

Dual 16� 220 060 231 151 231 156 220 066 231 158

Dual 24� 220 059 231 152 231 157 220 077 231 159

Dual 30� 220 058 220 071 159 417 220 078 220 080

Dual 45� 220 054 220 055 220 056 220 057 220 081

Triple 30� 220 068 220 072 220 073 220 079 220 082

Triple 45� 220 064 231 153 220 074

Radial Triple 22.5� 220 069 231 154 220 075

Quad 35/76� 220 061 220 062 220 076

Radial Quad 22.5� 220 070 231 155 220 065

(1) Use with retainer part, 152 290.

4301006Dual Triple Quad Triple Radial

A A BAA

120o 120o

Fig. 8-10 220 XXX Domed Nozzles

11. H-20 Automatic GunNozzles (contd)

Parts 8-21


104449F02

Issued 3/0242-H20-MA-03

Long Engagement, Domed Nozzles(1)(2)

Engagementmm (in.)


0.36(0.014)

0.41(0.016)

0.46(0.018)

0.51(0.020)

Steel, black oxide-coated

Dual, 30�, centered 0.31 (0.100) 226 773 226 774 301 980

Dual, 60�, centered 0.31 (0.100) 301 979 725 017 301981

Dual, 0�, 45�, offset 0.31 (0.100) 234 878

Phosphor bronze

Dual, 24�, centered 0.36 (0.150) 301 977 228 827 301 978

Steel, black oxide-coated

Single, 0�, centered 0.36 (0.150) 301 159 724 771 301 969

Single, 15�, offset 0.36 (0.150) 301 960 724 671 301 970

Single, 22.5�, offset 0.36 (0.150) 301 961 724 788 301 971

Dual, 16�, centered 0.36 (0.150) 301 962 301 967 301 972

Dual, 24�, centered 0.36 (0.150) 301 963 301 968 301 973

Dual, 30�, centered 0.36 (0.150) 301 964 189 174 301 974

Dual, 0�, 45�, offset 0.36 (0.150) 234 876 301 965 724 770 301 975

Dual, 45�, centered 0.36 (0.150) 301 966 724 789 301 976

Triple, 45�, 0�, 45�, centered 0.36 (0.150) 234 877

(1) Used to increase hydraulic pressure range in gear-to-line and run-up applications. Requires at least 2413.16-kPa (350 psi)for clean cut-off.(2) Use with retainer part, 152 290.

4202053

SINGLE,CENTERED

SINGLE,OFFSET

DUAL,CENTERED

DUAL,OFFSET

Fig. 8-11 Long Engagement Domed Nozzles; Single Orifice and Dual Orifice

Parts8-22


104449F02

Issued 3/0242-H20-MA-03

NordsonBrand Part

Description CV Watts Amps

125 343 24 Vdc, QD, 1/8 in. 0.5 2.9 0.12

125 346 1209 Vdc, QD, 1/8 in. 0.5 3.1 0.03

125 344 24 Vdc, QD, 1/4 in. 1.2 2.9 0.12

125 345 120 Vdc, QD, 1/4 in. 1.2 3.1 0.03

143 754 240 Vdc, QD, 1/4 in. 1.2 3.1 0.01

MacBrand Part

Description CV Watts Amps

901 138 24 Vdc, QD, 1/8 in. 0.18 6 0.25

901 081 Dual, 1/2 in. NPS Conduit, 1/8 in. 0.18 6 0.25

901 130 24 Vdc, 18 AWG (wire), 1/8 in. 0.18 6 0.25

810 283 24 Vdc, QD, 1/4 in. 0.5 24 1.0

816 373 Dual, QD, 1/4 in. 0.5 24 1.0

901 092 24 Vdc, 18 AWG (wire), 1/4 in. 0.5 24 1.0

901 149 240 Vac, 50/60 Hz, QD 1/4 in. 0.5 6.5 1.0

901 173 24 Vdc, QD, 1/4 in., water-resistant 0.5 24 1.0

NOTE: Check the timer current capacity rating against the valve rating. Dual-voltage solenoids (24 Vdc/120 Vac),while convenient, perform poorly compared to valves with discrete voltages. All the valves listed above havemodifications for high temperature operation.

12.Solenoids: Pneumatic3-Way Valves

h20-1 filtered gunsemanuals.nordson.com/adhesives/english_manuals/104525.pdf · use the following...

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