sealed combustion downflow gas furnaces

INSTALLATION INSTRUCTIONS

DLAS MODELS(No Coil Cabinet)

DGAT & DGAM MODELS(With Built-- In Coil Cabinet)

For Installation In:1. Manufactured (Mobile) Homes2. Recreational Vehicles & ParkModels

3. Modular Homes & Buildings

SEALED COMBUSTIONDOWNFLOW GAS FURNACESForced Draft with Direct Ignition (Hot Surface)

FURNACE SET---UP CHECK LIST

IMPORTANT: ONLY INDIVIDUALS HAVING PROVEN EXPERIENCE WITH THIS TYPE OF EQUIPMENTSHOULD ATTEMPT TO PERFORM SET--UP.

- HAS ROOF JACK CROWN BEEN CORRECTLYINSTALLED?

- HAS FURNACE GAS VALVE AND BURNER ORI-FICE BEEN CORRECTLY CONVERTED FOR L.P.GAS WHERE APPLICABLE?

- HAS FURNACE GAS VALVE BEEN DE---RATEDFOR ALTITUDES ABOVE 2000 FEET WHEREAPPLICABLE?

- IS GAS LINE OUTLET PRESSURE PROPERLY

SET FOR FUEL TYPE? (NATURAL GAS IS 3.5”W.C.; L.P. IS 10” W.C.)

- IS PRIMARY AIR PROPERLY ADJUSTED PERINSTALLATION INSTRUCTIONS?

- IS CROSS---OVER DUCT INSTALLED PERHOME BUILDER AND EVCON INSTALLATIONINSTRUCTIONS?

- HAS FURNACE BEEN OPERATED THROUGH ACOMPLETE HEATING CYCLE?

IMPORTANT: PROPER FURNACE SET--UP AND ADJUSTMENT IS THE RESPONSIBILITY OF THERETAILER/HOMEOWNER AND IS NOT COVERED UNDER WARRANTY.

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TABLE OF CONTENTS

GENERAL SPECIFICATIONS AND INSTRUCTIONS 4. . . . . . . . . . . . . . . . . . . . . . .

FURNACE SPECIFICATIONS 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INSTALLATION STANDARDS 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Comply with Local Codes 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .HIGH ALTITUDE INSTALLATIONS 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MINIMUM FURNACE CLEARANCES 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RETURN AIR REQUIREMENTS 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CLOSET INSTALLATIONS 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Furnace to Closet Door Clearance — Greater than 6 Inches 7. . . . . . . . . . . . . . . . . . . . . . . .Additional Requirements 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Floor or Ceiling Return Air System 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .SPECIAL CLOSET INSTALLATIONS 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Furnace to Closet Door Clearance — Greater than 1 Inch and Less than 6 Inches 8. . . .Furnace to Closet Door Clearance — Less than 1 Inch 8. . . . . . . . . . . . . . . . . . . . . . . . . . . .AIR DISTRIBUTION SYSTEMS 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ROOF JACKS 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Locating and Cutting Roof Jack Opening 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Installing Roof Jack in Roof 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CEILING RINGS 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DUCT CONNECTORS 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEMPLATE & CUTOUT DIMENSIONS 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DLAS SERIES FURNACES 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Installation Procedure for DLAS Furnace 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DGAT & DGAM SERIES FURNACES 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Installation Procedure for DGAT & DGAM Furnaces 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CONNECTING ROOF JACK TO FURNACE 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VENT SYSTEM INSTALLATION INSTRUCTIONS 16. . . . . . . . . . . . . . . . . . . . . . . . .EXISTING FURNACE REPLACEMENT 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .NEW HOME INSTALLATION 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .INSTALLATION IN SNOW REGIONS 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ELECTRICAL WIRING 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CONNECT ELECTRICAL POWER AND CONTROLS 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .WALL THERMOSTAT 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

THERMOSTAT WIRING FOR DGAT AND DGAM SERIES 18. . . . . . . . . . . . . . . . . .

THERMOSTAT WIRING FOR DLAS (HEAT ONLY) SERIES 19. . . . . . . . . . . . . . . . .

WIRING DIAGRAMS 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Wiring Diagram for DGAT Series 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Wiring Diagram for DGAM Series 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GAS PIPING 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .INSTALLATION AND CHECKING OF GAS LINE 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Observing Burner Operation 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Combustion Air 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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If Furance Fails to Operate Properly 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FINAL PROCEDURE 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Install Furnace Doors 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Finish and Trim 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Furnace and Air Conditioner Installations 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MANUFACTURED HOUSING DERATION CHART 25. . . . . . . . . . . . . . . . . . . . . . . . .PROPANE 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .NATURAL GAS 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REPAIR PARTS 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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LIST OF FIGURES

Figure 1 — Furnace Dimensions 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TABLE 1 — Furnace Specifications 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TABLE 2 — Electrical Specifications 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TABLE 3 — Minimum Clearances 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 2 — Alcove Installation 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 3 — Closet to Door Clearance — 6” or greater 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 4 — Furnace to Closet Door Clearance — 1” to 6” 8. . . . . . . . . . . . . . . . . . . . . . . . . .Figure 5 — Furnace to Closet Door Clearance — Less than 1” 8. . . . . . . . . . . . . . . . . . . . .Figure 6 — Air Distribution Systems 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 7 — Location of Roof Jack Opening 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TABLE 4 — DLAS Roof Jacks 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TABLE 5 — DGAT & DGAM Roof Jacks 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 8 — DLAS Models 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 9 — DGAT & DGAM Models 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 10 — Ceiling Rings 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TABLE 6 — Duct Connectors 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 11 — Duct Connector Dimensions 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 12 — Template 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 13 — Sub---base / Duct Connector 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 14 — Duct Connector 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 15 — Connecting Roof Jack to Furnace 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 16 — Electrical Power & Controls 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 17 — Thermostat Wiring 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 17a — Thermostat Wiring 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 18 — DGAT Series Wiring Diagram 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 19 — DGAM Series Wiring Diagram 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 20 — Natural Gas Flame Appearance 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 21 — Propane Gas Flame Appearance 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 22 — Anti---Backflow Damper 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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GENERAL SPECIFICATIONS AND INSTRUCTIONS

DGAT & DGAM SeriesDLAS Series

60 1/2”

76”

19---1/2”

9---3/4”

23”24”

10---5/8”

19---1/2”

9---3/4”

23”

24”

10---5/8”

15---7/8”

15---7/8”

2”

1---7/8”

(on Sub---Base)

Figure 1 -- DLAS, DGAT, and DGAM Series Furnace Dimensions

WARNING

IMPROPER INSTALLATION, ADJUSTMENT, SERVICEOR MAINTENANCE CAN CAUSE INJURY OR PROPER-TY DAMAGE.

PLEASE REFER TO ALL THE INSTRUCTIONS OF THISMANUAL FOR PROPER INSTALLATION PROCE-DURES. IMPROPER INSTALLATION WILL VOID THEWARRANTY.

THE FURNACE SHALL BE INSTALLED SO THE ELEC-TRICAL COMPONENTS ARE PROTECTED FROMWATER.

DO NOT TEST THE FUEL SYSTEM AT MORE THAN 14INCHES WATER COLUMN AFTER FURNACE HASBEEN CONNECTED TO THE FUEL LINE. SUCH TEST-ING MAY VOID THE WARRANTY. ANY TEST RUNABOVE 14 INCHES WATER COLUMN MAY DAMAGE

THE FURNACE CONTROL VALVE WHICH COULDCAUSE AN EXPLOSION, FIRE, OR ASPHYXIATION.

IMPORTANT NOTICEThese instructions are intended for the use of qualified indi-viduals specially trained and experienced in installation ofthis type of equipment and related system components.

Installation and service personnel are required by somestates to be licensed.Persons not qualified shall not install this equipment orinterpret these instructions.

NOTEThewords “Shall”or “Must” indicate a requirement which isessential to satisfactory and safe product performance.The words “Should” or “May” indicate a recommendationor advice which is not essential and not required but whichmay be useful or helpful.

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FURNACE SPECIFICATIONS

TABLE 1 — Furnace Specifications

DGAM — Automatic ignition — with Built-- in Coil Cabinet — 4 Ton -- A/C ReadyModel No. Factory Equipped for use with: Input/BTUH Output/BTUH

DGAM056BDD NATURAL GAS 56,000 46,000DGAM075BDD NATURAL GAS 75,000 61,000

DGAT — Automatic Ignition — with Built-- in Coil Cabinet — 3 Ton -- A/C ReadyModel No. Factory Equipped for use with: Input/BTUH Output/BTUH

DGAT056BDD NATURAL GAS 56,000 46,000DGAT070BDD NATURAL GAS 70,000 57,000DGAT075BDD NATURAL GAS 75,000 61,000DGAT090BDD NATURAL GAS 90,000 72,000

DLAS — Automatic Ignition — Heating Only — No Coil CabinetModel No. Factory Equipped for use with: Input/BTUH Output/BTUHDLAS056BDD PROPANE 56,000 47,000DLAS075BDD PROPANE 75,000 62,000

TABLE 2 — Electrical SpecificationsElectrical Power Supply — 120 Volts — 60 Hz — 1 PhaseBreaker or Fuse — 15 AmpThermostat Circuit — 24 Volt — 60 Hz — 40 VANominal Anticipator Setting — .50Gas Valve Inlet — 1/2” NFPT

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INSTALLATION STANDARDS

Comply with Local CodesThe installer shall familiarize himself with and comply withall local codes and regulationswhichgovern the installationof this appliance. Local codes and regulations shall takeprecedent over these regulations where applicable. In lieuof local codes, the appliance shall be installed in accor-dance with:

In the U.S.A.:

the National Electrical Code, in accordance with rec-ommendationsmade by the National Board of Fire Un-derwriters, in accordance with the the American Na-tional Standard Institute National Fuel Gas Code (AnsiZ223.1/NFPA---54).

The installation must conform with:

local building codes,Federal Manufactured Home Construction & SafetyStandard (H.U.D. Title 24, Part 3280),or in the absence of local codes with:American National Standard Mobile Homes A225.1 forinstallation in mobile homes, and American NationalStandard (ANSI---C1/NFPA---70) for all electricalwiring,and American National Standard (A119.2/NFPA---501C) for installation in recreational vehicles.

In Canada:

Manufactured (Mobile) Homes:Unit installation shall comply with current CSA stan-dard CAN/CSA---Z240.4.1 --- Installation Requirementfor Gas Burning Appliances in Mobile Homes.Unit electrical wiring and grounding shall comply withcurrent standard CSA C22.1 --- Canadian ElectricalCode Part 1.Recreational Vehicles:Unit installation shall comply with current CSA stan-dardCAN/CGA---Z240.4.2 --- InstallationRequirementsfor Propane Appliances and Equipment in Recreation-al Vehicles.Unit electrical wiring and grounding shall comply withcurrent CSA standard C22.2 No.148/CAN/CSA---Z240.6.2 --- Electrical Requirements for recreational ve-hicles.

HIGH ALTITUDE INSTALLATIONFor elevation above 2,000 feet, derate furnace orifice2% for each 1,000 feet of elevation abovesea level. Der-ating is accomplished by reducing the orifice size.See Derating Chart for orifice size and output adjust-ment.

MINIMUM FURNACE CLEARANCES

Access for servicing is an important factor in the location ofany furnace. Aminimumof 24 inches should be provided infront of the furnace for access to the heating elements andcontrols. This access may be provided by a closet door orby locating the furnace 24 inches froma facingwall or parti-tion.

These furnaces are design certified for the following mini-mum clearances from combustible material in alcove orcloset installation:

TABLE 3 — Minimum Clearances

CLOSET ALCOVE

BACK 0” 0”

SIDES 0” 0”

FRONT 6” 24”

TOP 2” 2”

ROOF JACK 0” 0”

DUCT 0” 0”

ALCOVE

20”Minimum

23---1/2”

Figure 2 — Alcove Installation

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RETURN AIR REQUIREMENTSCLOSET INSTALLATIONS

Figure 3 — Closet to Door Clearance — 6” or greater

CLOSET

FURNACE

DOOR

6” or greater —Closet to DoorClearance

Furnace to Closet Door Clearance —Greater than 6 InchesThe closet door MUST have a minimum of 250Square Inches of free area in the upper half of thedoor.

If the opening for return air is located in the side-wall and below the top of the furnace casing:a. total side return must equal or exceed350 sq. in. free area

b. 6” min. clearance must be provided onthe side where the return is located

Return Air Grille Part No.7900---286P/A — Almond7900---287P/A — White

Return Air Closet Door Part No.7900---8881 — Almond7900---7771/C — White

c. 6” min. clearance must bemaintained in front of the furnace.

Additional RequirementsAdditional requirements for floor and ceiling return systemfor closet installed sealed combustion heating applianceare given in the next paragraph.

Floor or Ceiling Return Air SystemFloor or ceiling return air system for closet installed directvent forced air heating appliance.

Listed in the next paragraph are the conditions tobemet byMobile Home Manufacturers to have U.L. acceptance ofin--- floor or ceiling return air systems of closet installed di-rect vent forced air heating appliances for Mobile Homes tobe sold in the United States.

A. The return---air opening into the closet, regardless oflocation, is to be sized not less than specified on theappliance’s rating plate.

B. If the return---air opening is located in the floor of thecloset (versus the vertical front or side wall), the open-ing is to be provided with means to prevent its inadver-tent closure by a flat object placed over the opening.

C. The cross---sectional area of the return duct system(when located in the floor or ceiling of themobile home)leading into the closet is to be not less than that of theopening specified on the appliance’s rating plate.

D. The total free area of openings in the floor or ceiling reg-isters serving the return---air duct system is to be notless than 150% of the size of the opening specified on

the appliance’s rating plate. At least one such registeris tobe locatedwhere likelihoodof its being coveredbycarpeting, boxes, and other objects is minimized.

E. Materials located in the return duct systemhave a flamespread classification of 200 or less.

F. Non---combustible pans having one--- inch upturnedflanges are located beneath openings in the floor re-turn duct system.

G. Wiring materials located in the return duct system con-form to Article 300---22 (b&c) of the National ElectricCode (ANSI C1 / NFPA---70).

H. Gas piping is not run in or through the return duct sys-tem.

I. The negative pressure in the closet as determined bytest with the air---circulating fan operating at high heat-ing speed and the closet door closed is to be not morenegative than minus 0.05--- inch water column.

J. For floor return systems, themobile homemanufactureror installer shall affix a prominent marking on or nearthe appliance where it is easily read when the closetdoor is open. The marking shall read:

WARNINGHAZARD OF ASPHYXIATION

DO NOT COVER OR RESTRICT FLOOR OPENING

or equivalent.

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SPECIAL CLOSET INSTALLATIONS

Furnace to Closet Door Clearance — Greater than 1 Inch and Less than 6 Inches

Figure 4 — Furnace to Closet Door Clearance — 1” to 6”

As an option to the lower grill,an undercut of 2 1/2” will provide50 Sq. In. of free area.

Clearance — Greater than 1 Inch andLess than 6 InchesA. The closet door MUST have a minimumof 250 Square Inches of free area in theupper half of the door and a minimum of50 Square Inches of free area in the low-er area of the door.The lower closet door grille may beomitted if an undercut of 2 1/2 Inches isprovided in the door.

B. A fully louvered closet door MUST havea minimum of 250 Square Inches of freearea in the upper half of the door.

Furnace to Closet Door Clearance — Less than 1 Inch

Figure 5 — Furnace to Closet Door Clearance — Less than 1”

Clearance — Less than 1”

The closet door MUST have three return airgrilles. The total free area of the two upper grillesmust be a minimum of 250 Square Inches. Thetotal free area of the lower grille MUST be aminimum of 50 Sq. In.

NOTE: Each grille MUST BE ALIGNED directlyopposite the corresponding return air grille ofthe furnace door.

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AIR DISTRIBUTION SYSTEMSFor proper air distribution, the supply duct system shall bedesigned so that the static pressure does not exceed thelisted static pressure rating on the furnace rating plate.

Three typical distribution systems are illustrated inFigure 6.

Location, size and number of registers should be selectedon the basis of best air distribution and floor plan of thehome.

The Air Temperature Rise is to be adjusted to obtain a tem-perature rise within the range(s) specified on the furnacerating plate.

ASingle trunk duct

Dual trunk duct

Transition duct

* BS 1 Crossover Duct must be centered directly under furnace.

S 2 Use 12” Diameter Round or equivalent insulated Flex---duct only.

S 3 Terminate Flex---duct (opposite furnace) in the center of the trunk duct.

S 4 Flex---duct material must be pulled tight — No Loops or unnecessary dips— Air Flow may be impeded.

1

2

3

4

B *Dual trunk duct with crossover connector

Crossover

CTransition Duct with Branches

Branches

Figure 6 — Air Distribution Systems

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ROOF JACKS

CAUTION

Only use the appropriate roof jack.See TABLE 4 & TABLE 5 for correct application.

Do not exceed themaximum height as determined fromTABLE 4 & TABLE 5. Installer should allow an addition-al 1--1/2” travel before the fluepipe assembly is fully ex-tended against the built-- in stop. This provides anaddi-tional safeguard against the flue assembly being pulledfrom the roof jack during transportation or other stressconditions.

Improper installation may damage the equipment, cancreate a hazard, and will void the warranty.

Carefully follow all instructions and warnings to avoidFire, Explosion, Or Asphyxiation.

Locating and Cutting Roof Jack Opening

To facilitate the proper installation of the roof jack, it is veryimportant that the roof jack opening in the ceiling and roofbe on the same vertical center line as the furnace flue collar.See Figure 7.

The dimensions shown in Figure 7 may be used if the fur-nace is flushwith thewalls or adjusted to allow for anyspac-ing away from either wall.

Mark this location on ceiling and scribe a circle with a 5” ra-dius (10” diameter) around this mark. Cut opening for roofjack through ceiling and roof. (If furnace was installedduring construction, cover furnace and flue opening toprevent debris from entering flue and combustion airwhen hole is cut for roof jack.)

9---3/4” 12---1/4”

Mark Center

Figure 7 — Location of Roof Jack Opening

TEMPLATE FRONT

These dimensions may beused if furnace fits snugagainst wall.

Installing Roof Jack in Roof(See Figure 8 & Figure 9 for Dimensional requirements.)

Insert roof jack into opening in the roof.

The roof jack should be secured to the furnace beforeroof flange (flashing) is secured to the roof. This will in-sure a better alignment of the flue pipe and furnace flue col-lar. Caulk completely around the underside of the roof jackflashing to provide a rain tight seal, before securing roofjack flashing to roof. After roof jack flashing has beensecured to the roof, caulk carefully all around swivel jointwith sealant supplied by furnace manufacturer.

12

TABLE 4 — DLAS Roof JacksRoof Jack Installation DimensionsModelNumber

¡Adjustable Height

4000---7121/C 75” to 86” These dimensions are4000---7141/C ** 83” to 104”

These dimensions arefrom the floor to thetop side of the roof4000---7151/C ** 90” to 116” top side of the roof.(See Figure 8.)

4000---7171/C 127” to 157”(See Figure 8.)

4000---8161/C *+ 85” to 101”4000---8181/C *+ 99” to 129”* These jacks have removable crowns.Note: It is recommended that the 7900---6171 (17”) Interiorextension be used with these models. If used refer to TABLE 5for sizing of roof jack.** Available with 3---1/2, 12 Pitch Fixed Flashing.Models 4000---6141 and 4000---6151+ Available with 3---1/2, 12 Pitch Fixed Flashing.Models 4000---9161 and 4000---9181

TABLE 5 — DGAT & DGAM Roof JacksRoof Jack Installation DimensionsModelNumber

¡Adjustable Height

4000---7101/C 86” to 95” These dimensions4000---7121/C 91” to 102”

These dimensionsare from the floor tothe top side of the4000---7141/C ** 99” to 120” the top side of theroof. See Figure 9.

4000---7151/C ** 106” to 132”roof. See Figure 9.

4000---7171/C 143” to 173”4000---8161/C *+ 101” to 117”4000---8181/C *+ 115” to 145”* These jacks have removable crowns.** Available with 3---1/2, 12 Pitch Fixed Flashing.Models 4000---6141 and 4000---6151+ Available with 3---1/2, 12 Pitch Fixed Flashing.Models 4000---9161 and 4000---9181

ROOF FLANGE IS ADJUSTABLE UP TO 23˚ (5---12 PITCH)

WARM AIR DUCTDUCT CONNECTOR

ROOF

76”

CAULK CAREFULLY ALL AROUNDSWIVEL JOINT WITH SEALANTSUPPLIED BY FURNACEMANUFACTURER.

IMPORTANTSEAL ROOF JACK FLASHING TO THEROOF JACK AND ROOF.THIS IS THE INSTALLER’S RESPONSIBIL-ITY.

60---1/2”

WARM AIR DUCT DUCT CONNECTOR

FLOOR

FLUEGASES

COMBUS-TIONAIR

CAULKUNDERFLASHING The Bead or End of Upper Por-

tion of Roof Jack need Not ex-tend below the ceiling.

(INCLUDESSUB---BASE)

19 1/2”

CAULKUNDERFLASHING

¡ ¡

FLUEGASES

COMBUS-TIONAIR

19 1/2”

Figure 8 — DLAS Models Figure 9 — DGAT & DGAM Models

NOTE:

13

CEILING RINGSThe ceiling ring is to meet fire stop requirements.Accessory Ceiling Ring (P/N 7660---2841) may beused, (see Figure 10) or the mobile home manufactur-er or the installer may use other approved methods tostop fire.If required, three (3) sections of AccessoryRingmaybeused as shown in Figure 10B to provide closer clear-ance around roof jack.

Figure 10 — Ceiling Rings

A B

DUCT CONNECTORS

The duct connector is designed for use on ducts down to12” in width. When using the connector on smaller widthducts, therewill not be sufficient clearance tobend the tabson two sides of the duct connector.

In such cases the tabs may be attached to the sides of theduct by using sheet metal screws or other suitable fasten-ers. Holes for sheet metal screws are provided in three (3)tabs on each side of the duct connector. If more than 3 tabsneed to be used to provide amore secure and air tight con-nection, the remaining tabs can also be fastened to theduct with screws after drilling the required screw holes.

If tape is used to provide a better air seal, it should be a typeapproved by the applicable national or local codes.

TABLE 6 — Duct Connectors

Sales Package Part Number Depth

7681---6621 7681---602 2” Duct Connector — For Ducts 1---1/8” below top of floor surface









TEMPLATE & CUTOUT DIMENSIONS

14”

13---9/16”

11---9/16”

Duct CutoutDimensions

12”

NOTE:Duct Connector may be usedpositioned in any of four (4))positions to fit duct.

Figure 11 — Duct Connector Dimensions

Casing Front

Door Front

15---7/8”

9---7/8”12---1/4”

15---7/8”1---13/16

9---3/4”

23”

1”

Floor Cut---out Line

Flue Center

DuctLocatingHole

1---15/16”

Figure 12 — Template

14

DLAS SERIES FURNACES

Installation Procedure for DLAS FurnaceThe following steps are listed for installation of furnace andneed not be performed in the exact order as listed.Follow this procedure to avoid serious misalignment of fur-nace duct connector opening and supply duct.

A. This Furnace requires a SUB--BASE (Included)

For convenience, a template is providedon the furnaceshipping carton. This may be cut out andused to accu-rately locate furnace, floor and vent openings. SeeFigure 12.Locate template on floor to provide proper clearancesto the walls and the front. Cut 2” diameter hole or smallsquare hole as indicated on template.Locate template so that furnace opening outline is cen-tered over under--- floor supply duct as accurately aspossible. This is important because of the limited ad-justment from side to side, and from front to rear of theduct connector.Locate under--- floor duct throughhole and center “floorcut---out opening” on template over duct.Accurately cut “floor cut---out opening” from template,mark floor opening, remove template and cut floor onoutside edge of marked line.Position sub---base over hole.

Duct connectorswill fit openings of sub---base in any oneoffour (4) positions. Place proper duct connector in the open-ing in the best position, (duct connector may be shifted ineither direction for best location).Mark duct opening with a scribe or marking pen, then re-move duct connector. Cut hole in duct to correct size ac-

cording to dimensions shown in Figure 11. Cut duct accu-rately to prevent air leakage.Reinstall duct connector with tabs inside of hole in the ductand bend tabs up firmly against underneath side of duct.Secure duct connector with four (4) sheet metal screws us-ing holes provided in the connector, and the sub---base.See Figure 13.Secure sub---base to floor with 2 or more screws or nails.B. Install FurnaceCheck to make sure roof jack is not extending too fardown into furnace location. Slide furnace into locationand align over floor opening.Pre---cut openings and knock---outs are provided infurnace base to install a front fuel line and/or front re-frigerant lines. If rear entrance lines are to be used,they must be installed before the duct connector isinstalled and secured in place.For air conditioning lines, remove the knock---out.

C. Securing FurnaceMake any minor adjustments in the furnace locationnecessary to insure that the opening in the furnacebot-tom is centered over the opening in the duct. Securefurnace to sub---base, as required, through holes atfront and rear of furnace. Holes for screws are locatedin bottom flange front corners and rear flanges.Secure furnace to wall at top by using metal strap pro-vided. (See Figure 13.)Manufacturers may add straps equivalent to providedstraps, if required, for securing furnace to structuralmember.

Secure Sub---baseto floor firmly with 2or more screws Ornails.

Secure duct connectorto sub---base with 4screws.

Use screw holes in sub---baseto fasten duct connector .

Bend tabs of ductconnector under ductopening to secure to thesupply duct.

Secure sub---baseto floor with 2 nailsor screws.

TABS TABS

DUCT DUCT

1.. Insert Duct Plenum Con-nector Into Duct Cut---out.

2.. Bend Bottom Tabs Over And OntoThe Underneath Duct Service.

For improved airseal, ductconnector flangesmay be sealed tothe sub---base withaluminum ducttape.

Figure 13 — Sub--base / Duct Connector

15

DGAT & DGAM SERIES FURNACES

Installation Procedure for DGAT & DGAMFurnaces

The following steps are listed for installation of furnace andneed not be performed in the exact order as listed:Follow this procedure to avoid serious misalignment of fur-nace duct connector opening and supply duct.

A. This Furnace requires NO sub--base

For convenience, a template is providedon the furnaceshipping carton. This may be cut out andused to accu-rately locate furnace, floor and vent openings. SeeFigure 12.Locate template on floor to provide proper clearancesto the walls and the front. Cut 2” diameter hole or smallsquare hole as indicated on template.Locate template so that furnace opening outline is cen-tered over under--- floor supply duct as accurately aspossible. This is important because of the limited ad-justment from side to side, and from front to rear of theduct connector.Locate under--- floor duct throughhole and center “floorcut---out opening” on template over duct.Accurately cut “floor cut---out opening” from template,mark floor opening, remove template and cut floor onoutside edge of marked line.

Duct connectors will fit opening in any one of four (4) posi-tions. Place proper duct connector in the opening in thebest position, (duct connector may be shifted in either di-rection for best location).

Mark duct opening with a scribe or marking pen, then re-move duct connector. Cut hole in duct to correct size ac-cording to dimensions shown in Figure 11. Cut duct accu-rately to prevent air leakage.Reinstall duct connector with tabs inside of hole in the ductand bend tabs up firmly against underneath side of duct.Secure duct connector to floor with four (4) sheet metalscrews using holes provided in the connector. SeeFigure 14.

B. Install Furnace

Remove panel from air conditioning compartment.Check to make sure roof jack is not extending too fardown into furnace location. Slide furnace into locationand align over floor opening.Pre---cut openings and knock---outs are provided infurnace base to install a front fuel line and/or front re-frigerant lines. If rear entrance lines are to be used,they must be installed before the duct connector isinstalled and secured in place.For air conditioning lines, remove the knock---out.

C. Securing FurnaceMake any minor adjustments in the furnace locationnecessary to insure that the opening in the furnacebot-tom is centered over the opening in the duct. Securefurnace to floor, as required, through holes at front andrear of furnace. Holes for screws are located in bottomflange front corners and rear flanges.Secure furnace to wall at top by using metal strap pro-vided. (See Figure 14.)Manufacturers may add straps equivalent to providedstraps, if required, for securing furnace to structuralmember.

SUPPLY DUCTOPENING

Fuel LineOpening

Use screw holes in furnacebase to fasten to duct con-nector (relative to position ofduct connector) .

Secure furnace to ductconnector base with 4screws.

RefrigerantLine Opening

FurnaceBase

Bend tabs ofduct connectorunder ductopening to se-cure to thesupply duct.

TABS TABS

DUCT DUCT

1. Insert Duct PlenumConnector Into DuctCut---out.

2. Bend Bottom Tabs OverAnd Onto The UnderneathDuct Service.

Figure 14 — Duct Connector

16

CONNECTING ROOF JACK TO FURNACE

CAUTIONThe inner flue pipe must be present.

It is mandatory that the combustion air pipe and fluepipe assembly be fully engaged. The combustion airpipe MUST be securely fastened to the furnace withsheet metal screws in the holes provided.

Use 1/2”blunt or sharp endsheetmetal screws to fastenroof jack combustion air pipe to furnace combustionaircollar. Screw holes are provided in the pipe and collar.Excessively long screws may extend to flue pipe andpuncture it. Screws are not to exceed 1 1/2” in length.

NOTECombustion air tube and flue pipe are part of the same as-sembly. Only the combustion air tube need be fastened tothe furnace.

1. Check to be certain that the flue pipe and combustionair tube are present.

2. Pull the telescoping flue tube and combustion air tubeassembly down from the roof jack. Slide the flue tube/combustion air tube assembly down firmly over the fur-nace flue outlet and combustion air collar. Insure thatthe back, side and front of combustion air tube collaris fully engaged. Fasten the combustion air tube to thefurnace combustion air collar using two (2) 1/2 inchsheet metal screws. (Screw holes are provided in com-bustion air tube and furnace combustion air collar.(See Figure 15.)

It is mandatory that the combustion air and flue tubeassembly be fully engaged at back sidesand front, andcombustion air tube securely fastened to the furnacewith sheet metal screws (2) in the screw holes pro-vided.

COMBUSTIONAIR TUBE

FLUE PIPE

K SCREWHOLES (2)

COMBUSTIONAIR TUBE COLLAR

K #8 OR #10SCREWS RECOMMENDED

FURNACEFLUE OUTLET

SECURESTRAPTO WALL

FRONT OF FURNACE

Figure 15 — Connecting Roof Jack to Furnace

17

IMPORTANTVENT SYSTEM INSTALLATION INSTRUCTIONS

WARNING

FAILURE TO FOLLOW ALL VENTING INSTRUCT--IONS CAN RESULT IN FIRE, ASPHYXIATION, OREXPLOSION.

The vent system is an important part of your furnace instal-lation. Carefully read and observe the following basicinstructions, as well as those packed with the vent system.

EXISTING FURNACE REPLACEMENT

IF THIS FURNACE REPLACES AN EXISTING FURNACE,DO THE FOLLOWING.

1. If a 2nd roof, roof cap or addition has been made to theexisting roof of the home, remove theold vent systemcompletely!... to avoid the possibility of an improp-erly installed pipe or gaps in the old vent system,INSTALL A NEW VENT SYSTEM. Your ceiling androof heightwill determine the correct vent system touse. Refer to the vent selection table, of the furnaceinstallation instructions.

2. After unpacking the vent system, check the rain caps.Insure they are not damaged, tilted or crooked. Do nottwist, crush or sit on the roof caps during installa-tion. Damaged roof caps will cause improper furnaceoperation. The furnace will not heat properly and couldresult in explosion.

3. After installing vent pipe on furnace top collar, check tomake sure there is no gap in back or side between thepipe collar and the furnace casing top.

4. Use only the pipes provided with the roof jack assem-bly. Do not add to or adapt other sheet metal pipes.Donot cut, insert or add other pipes to this assembly.

5. In no case should there be a gap between sections ofthe flue pipe or the combustion air pipe.

NEW HOME INSTALLATION

IF THIS FURNACE IS INSTALLED ON A NEW HOME DOTHE FOLLOWING

1. Inspect the furnace top collars for signs of insulation orceiling debris which might have fallen in during cuttingof the ceiling and roof holes. Remove all debris beforecontinuing.

2. After unpacking the vent system, check the rain caps.Insure they are not damaged, tilted or crooked. Do nottwist, crush or sit on the roof caps during installa-tion. Damaged roof caps will cause improper furnaceoperation. The furnace will not heat properly and couldresult in explosion.

3. Before inserting the vent pipe into the furnace top, in-spect the furnace flue and combustion air opening fordebris or insulation which might have fallen in duringpre--- installation steps. Do not proceed unless all de-bris have been cleaned out or removed.

4. After installing vent pipe on furnace top collar, check tomake sure there is no gap in back or side between thepipe collar and the furnace casing top.

INSTALLATION IN SNOW REGIONS

When the combustion air pipe inlet is covered or blockedwith snow, the furnace will not operate properly due to thedepleted combustion air supply.

Therefore, if the furnace will be located in regions wheresnow accumulation on the roof exceeds 7” or in H.U.D.Snow Load Zones, a # 7680B6541 roof jack extension isrecommended.

18

ELECTRICAL WIRING

CAUTION

TO INSTALLER: INCOMING POWER MUST BE PO-LARIZED. OBSERVE COLOR CODING.

DANGER-- SHOCK HAZARD --

DISCONNECT ELECTRICAL POWER SUPPLY TO THEUNIT BEFORE SERVICING TO AVOID THE POSSIBIL-ITY OF SHOCK INJURY OR DAMAGE TO THE EQUIP-MENT.

CONNECT POWER SUPPLY WIRES

a. Remove the field wiring cover.

b. Insert 115 volt wires through the large plastic bush-ing on the left side of the furnace ( See Figure 16).If conduit is used it should be secured to thecontrolbox.

c. Connect the “hot” wire to the BLACK pigtail lead,and the “neutral”wire to theWHITEpigtail lead.Se-cure all connections with suitable wire nuts andwrap with electrical tape.

d. Connect the “ground”wire to the grounding screw.

e. Reinstall the control panel cover and securemounting screw.

CONNECT THERMOSTAT WIRES

a. Insert 24 volt wires through the small plastic bush-ing just above the control panel.

b. Connect the thermostat wires to the furnace lowvoltage pigtails (See Figure16).

c. Connect low---voltage circuit to the wall thermostatpigtails.

A separate 120 V.A.C. supply circuit must be used for thefurnace. The circuit should be protected by a 15 amp fuseor circuit breaker.

Figure 16

This screw does notneed to be removed inorder to remove thefield wiring cover. (justloosen).

NOTE:Cover shouldnot be removedexcept whenservicing thecontrols.

WALL THERMOSTATAvoid locations where the thermostat could be subject todrafts from outside, or exposed to direct light from lamps,sun, fireplaces, etc., or affected by air from a duct registerblowing directly on the thermostat.

The wall thermostat should be mounted approximately 5feet from the floor. The preferred location is on an insidewall situated in an area with good air circulation, andwherethe temperature will be reasonably representative of otherliving areas the thermostat is controlling.

19

THERMOSTAT WIRING FOR DGAT AND DGAM SERIES

Figure17 -- Thermostat Wiring

White

Green

Black

Red

Blend AirControl Box

CondensingUnit

Wall Thermostat Furnace Control Box

Not Factory Installed

White

Green

BlackRed

Yellow

White

GreenRed

Yellow

20

THERMOSTAT WIRING FOR DLAS (HEAT ONLY) SERIES

Wall Thermostat(Rear View)

Furnace Control Box

Figure17a --- Thermostat Wiring for DLAS Series

R

W

WhiteGreenBlack

RedYellow

White

Red

21

Figure 18 -- DGAT Series Wiring Diagram

W

G

RH

Y

WallThermostat

1 2 3 4 5 6 7 8 9

UpperLimit Switch

LowerLimitSwitch

CentrifugalSwitch

CombustionBlowerMotor1

23456

Hot SurfaceIgnitor

GasValve

12

3456789

BlowerMotor

SystemSwitch

To Earth Ground

Neutral

L1115VAC{

To A/CCondensingUnit (Ifequipped)

Incoming Power MustBe Polarized. ObserveColor Coding

NEUTRALS

GroundScrew

HEAT

COOL

L1 XFMR

COM

24VAC

RED

BLK

BRN

WHT

WHT

BLK

BLU

REDLOAD

LINE

WHT

WHT

BLK

SensorRod

BLK

BRNBRN

BLK

BLU

BLU

GRN

ORG

BLU

GRY

W

G

R

Y

CBLK

BLK

BLK

GRN

WHT

RED

YEL

BLK

GRN

WHT

Transformer

YEL

RED

WHT

2

1

Blend AirControl Box(If equipped)

22

Figure 19 -- DGAM Series Wiring Diagram

Blend AirControl Box(If equipped)

G

RH

Y

WallThermostat

1 2 3 4 5 6 7 8 9

UpperLimitSwitch

LowerLimitSwitch

CentrifugalSwitch

CombustionBlowerMotor1

2

3456

Hot SurfaceIgnitor

GasValve

1

234567

89

BlowerMotor

SystemSwitch

To Earth Ground

Neutral

L1115VAC{

To A/CCondensingUnit (Ifequipped)

Incoming Power MustBe Polarized. ObserveColor Coding

NEUTRALS

GroundScrew

HEAT

COOL

L1 XFMR

COM

24VAC

RED

BLK

WHT

WHT

BLK

BLU

REDLOAD

LINE

WHT

WHT

BLK

SensorRod

BLK

BRNBRN

BLU

BLU

GRN

ORG

BLU

GRY

WG

R

Y

C

BLK

BLK

BLK

GRN

WHT

RED

YEL

BLK

GRN

WHT

Transformer

YEL

RED

WHT

2

1

WHT

BLK

RED

W

23

GAS PIPING

INSTALLATIONANDCHECKINGOF GAS LINE

Gas Supply piping must be sized in accordance with therecommendations contained in “American National Stan-dard Institute Installation of Gas Piping” ANSI 223.1 unlesslocal codes or regulations state otherwise.

Materials used and pipe sizing for U.S. mobile homesmustcomply with requirements contained in Mobile HomesA119.1, Recreational Vehicles A119.2 and H.U.D. Title 24,Section 280.705 and any local or state codes.

NOTEThe gas line inlet on the gas valve is 1/2 ---14 N.P.T. The gasline may be installed through the furnace floor or furnaceside to the gas valve.

CAUTION

To install gas line and to connect it to thegas valve, caremust be taken to hold gas valve firmly to prevent mis-alignment of the burner orifice, or to damage gas valvewhich could result in improper heating, explosion, fireor asphyxiation.

DO NOT USE EXCESSIVE PIPE SEALANT ON PIPEJOINTS. Pipe sealant, metal chips or other foreign ma-terial that could be deposited in the inlet of the gasvalve, when gas pipe is installed or carried through thegas piping into the gas valve inlet after installation,maycause the gas valve to malfunction and could result inpossible improper heating, explosion, fire or asphyxi-ation. Also, pipe sealant must be resistant to Propanegas.

Where regulations require, a main shut--off valve shallbe installed externally of furnace casing. After pipinghas been installed, turn gas on and check all connec-tions with a leak detector or soap solution.NEVER USE OPEN FLAME. FIRE OR EXPLOSIONCOULD OCCUR.Do not test the fuel system at more than 14” W.C. afterfurnace has been connected to fuel line. Such testingcould void the warranty. Any test run above 14” W.C.may damage furnace control valve which could causean explosion, fire or asphyxiation.

Adirt legmaybe required by some local codes to trapmois-ture and contaminations.

For NAT. gas operation, the furnace is designed for 7”W.C.inlet gas pressure. Pressure tomain burner is then reducedto 3 1/2” W.C.

For Propane gas operation, the furnace is designed for 11”W.C. inlet gas pressure. Pressure to main burner is thenreduced to 10” W.C.

IMPORTANTWhen converting valve from or to Propane gas, it will benecessary to change main burner orifice to prevent an un-derfired or overfired condition. See furnace nameplate forcomplete instructions.

CAUTIONIf the gas input to the furnace is too great becauseof excessive gas pressure, wrong size orifice, highaltitude, etc., the burner flame will be sooty andmay produce carbonmonoxide,which could resultin unsafe operation, explosion, and/or fire or as-phyxiation.

Observing Burner Operation1. Observe burner to make sure it ignites. Observe colorof flame. On natural gas the flame will burn blue withappreciably yellow tips. OnPropane gas a yellow flamemay be expected. If flame is not the proper color call aqualified serviceman for service.

2. Let furnace heat until blower cycles on.

3. Turn thermostat down.

4. Observe burner to make sure it shuts off.

5. Let the furnace cool and blower cycle off.

WARNINGShould overheating occur, or the gas supply fail toshut off, shut off the manual gas valve to the fur-nace and allow burner to run until furnace coolsdown and blower shuts off before shutting off theelectrical supply.If any abnormalities are observed when checking for cor-rect operation, such as burner failing to ignite or to turn off,sooty flame, etc., call your nearest authorized service tech-nician as shown in the Service Center List included in thehome owner envelope with the furnace.

Combustion Air

In order for the burner flame to burn efficiently, it must re-ceive adequate combustion air.

The amount of combustion air can be changed by operat-ing the combustion air adjustment rod located beneath thegas valve. (See Figures 19 and 20.)

The adjustment rod is set at an “average” position at thefactory and may be properly set for many applications.

24

However, the amount of combustion air required will varydepending on altitude, actual BTU. content of the gas be-ing used, gas pressure, conversion to another gas, andother variable factors.

Therefore, it is essential that the burner flame be observedand any necessary adjustments are made before the fur-nace is put into service at the final home site. Adjusting theburner air is considered part of the normal home set---upprocedure and is the responsibility of either the homeselleror buyer, depending on their agreement. Adjustments ofthis type are not covered by the warranty.

CAUTIONCombustion air adjustmentsmust bemade only bya qualified technician. Improper air adjustmentmay causeunsafe operation, explosionor asphyxi-ation.

To adjust the combustion air:1. To light and operate furnace see label inside lower fur-nace door.

2. Allow the burner to burn for about 1 MINUTE.3. Look through the observation window and observe theappearance of the flame.

4. On natural gas, the base of the flame should be bluebut the tips of the flame will be yellow. (See Figure 20.)

5. On Propane gas, almost all of the flame will be yellowalthough some blue should still be present at the baseof the flame next to the end of the burner. (See Figure21.)

6. If the flame is too yellow, the combustion air should beincreased. If the flame is excessively blue (no yellow)the combustion air should be decreased.

7. To adjust the combustion air, loosen the lock screwholding the combustion air rod in place. Push in on therod to increase the combustion air. Pull out on the com-bustion air rod to decrease the combustion air. Tightenlock screw after adjustment is made. Do not complete-ly close air damper at any time. Complete closure of airdamper to burner will result in improper operation. Seecaution above.

View of Burner Through the Observation Window

Correct Amount ofPrimary Air

Too Little Primary AirPush Shutter Rod In

Too Much Primary AirPull Shutter Rod Out

Correct Amount ofPrimary Air

Too Little Primary AirPush Shutter Rod In

Too Much Primary AirPull Shutter Rod Out

Figure 20 -- Natural Gas Flame Appearance

Figure 21 -- Propane Gas Flame Appearance

25

If Furnace Fails to Operate Properly1. Check setting of thermostat --- and position of HEAT/COOL switch if air conditioning is installed. If a set---back type thermostat is employedbe sure that the ther-mostat is in the correct operating mode.

2. Check to see that electrical power is ON.3. Check to see that the knob on the gas control valve isin the full ON position.

4. Make sure filters are clean, return grilles are not ob-structed, and supply registers are open.

5. Be sure that furnace flue piping is open and unob-structed.

If the cause for the failure to operate is not obvious, donot attempt to service the furnace yourself. Call a quali-fied service agency or your gas supplier.

FINAL PROCEDURE

Install Furnace DoorsInstall the bottom door first by holding the door flushagainst the casing and sliding the door down until thedoor top and bottom flanges rest in the casing chan-nels. Then install the upper door in the same manner.

Finish and TrimAlcove and Closet Installations may now be fin-ished and trimmed as necessary.Leave enoughgapabove upper furnace door to allow itto be lifted and removed.

NOTESee nameplate for conversion and lighting instructions. Ob-tain a temperature rise within the ranges specified on thename plate.

SUPPLY DUCTOPENING

FurnaceBase

Figure 22 -- Anti--Backflow Damper

Duct Connector

AutomaticDamper

Note: For best air delivery install damper with bladesparallel to supply duct.

Furnace and Air Conditioner InstallationsIn an air conditioner is installed which does not use theblower for air distribution and operates completely inde-pendent of the furnace, the thermostat system must havean interlock to prevent the furnace and air conditioner formoperating at the same time. This interlock system usuallycontains a heat---cool switchwhichmust be turned toeitherHEAT or COOL to activate either heating or cooling opera-tion, or a positive OFF switch on the cooling thermostat.

When used in connection with a cooling unit the furnaceshall be installed parallelwith or on the upstreamside of thecooling unit to avoid condensation in the heat exchanger.

For installations with a parallel flow arrangement, the fur-nace must be equipped with a damper to prevent cold airfrom being discharged up around the heat exchanger.Cold air causes condensation inside the exchanger andcan cause it to rust out which can allow products of com-bustion to be circulated into the living area by the furnaceblower resulting in possible asphyxiation. An air flow acti-vated automatic damper, P/N 7900---6771, is available fromfurnace manufacturer.

MANUFACTUREDHOUSINGDERATIONCHART—DGAM,DGAT,DLASSeries

PROPANE

56,000—Input

70,000—Input

75,000—Input

90,000—Input

Elevation

Output

Orifice/

Drill

Part#

Output

Orifice/

Drill

Part#

Output

Orifice/

Drill

Part#

Output

Orifice/

Drill

Part#

0---2000

(Factory)47,000

.082/459951---0821

57,000

.093/429951---0931

60,000

.096/419951---0961

72,000

.104/379951---1041

2,000

43,240

.082/469951---0821

52,440

.093/429951---0931

55,200

.093/429951---0931

66,240

.101/389951---1011

3,000

41,360

.078/479951---0781

50,160

.089/439951---0891

52,800

.093/429951---0931

63,360

.099/399951---0991

4,000

39,480

.078/479951---0781

47,880

.089/439951---0891

50,700

.093/429951---0931

60,430

.099/399951---0991

5,000

37,600

.078/479951---0781

45,600

.089/439951---0891

48,000

.089/439951---0891

57,600

.098/409951---0981

6,000

35,720

.076/489951---0761

43,320

.086/449951---0861

45,600

.089/439951---0891

54,720

.096/419951---0961

7,000

33,840

.076/489951---0761

41,040

.086/449951---0861

43,200

.086/449951---0861

51,840

.093/429951---0931

8,000

31,960

.073/499951---0731

38,760

.082/459951---0821

40,800

.086/449951---0861

48,960

.093/429951---0931

9,000

30,080

.073/499951---0731

36,480

.082/459951---0821

38,400

.082/459951---0821

46,080

.089/439951---0891

10,000

28,200

.073/509951---0731

34,200

.078/479951---0781

36,000

.082/469951---0821

43,200

.089/439951---0891

NATURALGAS

56,000—Input

70,000—Input

75,000—Input

90,000—Input

Elevation

Output

Orifice/

Drill

Part#

Output

Orifice/

Drill

Part#

Output

Orifice/

Drill

Part#

Output

Orifice/

Drill

Part#

0---2000

(Factory)46,000

.128/309951---1281

56,000

.149/259951---1491

59,000

.154/239951---1541

72,000

.177/169951---1771

2,000

42,320

.128/309951---1281

51,520

.149/259951---1491

54,280

.149/259951---1491

66,240

.173/179951---1731

3,000

40,480

.120/319951---1201

49,280

.144/279951---1441

51,920

.149/259951---1491

63,360

.169/189951---1691

4,000

38,640

.120/319951---1201

47,040

.144/279951---1441

49,560

.144/279951---1441

60,480

.169/189951---1691

5,000

36,800

.120/319951---1201

44,800

.140/289951---1401

47,200

.144/279951---1441

57,600

.166/199951---1661

6,000

34,960

.120/319951---1201

42,560

.140/289951---1401

44,840

.144/279951---1441

54,720

.166/199951---1661

7,000

33,120

.116/329951---1161

40,320

.136/299951---1361

42,480

.140/289951---1401

51,840

.161/209951---1611

8,000

31,280

.116/329951---1161

38,080

.136/299951---1361

40,120

.136/299951---1361

48,960

.157/229951---1571

9,000

29,440

.113/339951---1131

35,840

.128/309951---1281

37,760

.136/299951---1361

46,080

.154/239951---1541

10,000

27,600

.110/359951---1101

33,600

.128/309951---1281

35,400

.128/309951---1281

43,200

.149/259951---1491

Above2,000feet:Deratefurnaceoutputcapacity@4%per1,000feetofelevation.

Orificederation=2%foreach1,000feetofelevation.Highaltitudeoxygenlevelderation=2%per1000feetofelevation.

Adjustairshutterforcorrectflamecolor.

26

27

DGAM, DGAT & DLAS SERIESHSI Gas Downflow Furnace

Repair Parts List for:DGAM056BDD DGAT056BDD DLAS056BDD DGAT070BDD DGAM075BDD DGAT075BDD DLAS075BDD DGAT090BDD

29

25

20

36

37

38

22

5

21

21

40

44

3

46

7

8

9

2

15

45

43

42

41

39

32 33

31

34

17

18

10

23

24

12

26

BURNERORIFICE(SEE CHART)

CODEUSED ONMODEL

NO.REQ.

PARTNUMBER DESCRIPTION

__ ALL X 8B246P8B247P

Enamel (Spray 15 oz. Almond)Enamel (Spray 15 oz. White)

2 ALL 1 7945A5721 Casing Top* 3 ALL 1 7990---3591B Limit Switch (Upper)

(180˚ Manual Reset)4 ALL 1 7990---6451 Booster Assembly (Includes Code 5 --- 9)5 ALL 1 7995A386 Booster Gasket6 ALL 1 2900---3601 Impellor (3 13/16 x 1 7/8 x 1/4)7 ALL 1 2900---147 Mount Plate (Booster Motor)8 ALL 1 7990---300 Motor Mount Plate Gasket

* 9 ALL 1 7990---317P Booster Motor --- 3000 RPM

B NOTE: The 7624A3591 (180˚ Manual Reset) is a designed approved alternate for this limit switch.

28

DGAM, DGAT, & DLAS SERIESHSI GAS DOWN FLOW FURNACE

CODEUSED ONMODEL

NO.REQ.

PARTNUMBER DESCRIPTION

10 ALL 1 7945---1351/B Cover (Control Box)* 12 ALL 1 7990---319P Integrated Control* 15 ALL 1 7990---326PBB Gas Valve (24V .5 Amp 1/2” x 3/8”)16 --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---17 ALL 1 7945---5151/C Valve Bracket18 DGAM,DGAT 1 7956A5201 Panel (Coil Cavity 19 13/16”19 --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---

* 20 ALL 1 7670---368P/A Thermostat (Adj. Ant.)21 ALL 1 7945---3011 Gasket Pkg. (Heat Exchanger)22 ALL 1 7995---5751 Heat Exchanger (with Gaskets)

* 23 ALL 1 7975---3881 Remote Sensor24 ALL 1 7681---3301 System Switch25 ALL 1 7956---1121 Junction Box Cover

* 26 ALL 1 2940A3541 Transformer (115---24V 40VA)* 29 056

070,075090

1 7945---3281/A7970---3281/A7995---3381/A

Limit Switch (OPEN---140˚ CLOSE---110˚)Limit Switch (OPEN---145˚ CLOSE---115˚)Limit Switch (OPEN---150_ CLOSE---120_)

31 ALL 1 7970---5851/A Burner Assembly (Less Gas Valve ---Includes Codes 32, 33, 34)

* 32 ALL 1 1474---0521 Hot Surface Ignitor33 ALL 1 7970---179 Ignitor Shield34 ALL 1 7945---1631/A Mounting Plate (Burner)35 --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---

* 36 ALL 1 1214---2511 Filter (16 x 20 x 1 Disposable) (2 Required)37 DGAM

DLAS, DGAT

1

11

7975---1561/B

7990---1561/A

Panel (Upper)(White)

Panel (Upper)(White)

38 DGAM,DGAT

DLAS

1

1

7956---1571/A

7956---1631/A

Panel (Lower)(White)

Panel (Lower)(White)

BLOWER PARTS

* 39 DGAM 1 1468---220P MotorDGAT, DLAS(057, 070, 075)

1 7966---311P Motor

090 1 1468---212P Motor40 All 1 7966A530 Scroll41 All 1 2702---4091 Motor Mount(3/Pkg.)42 All 1 7680---348 Connector Plug43 All 1 7670---6391 Motor Clamp

* 44 090DGAM

11

1499---44611499---4471

Run CapacitorRun Capacitor

45 All 1 1472---2751 Blower Wheel(10 5/8 Dia. x 7 1/8 x 1/2)

BURNER ORIFICE CHARTMODEL 056 070 075 090Nat. 9951---1281 9951---1491 9951---1541 9951---1771LP 9951---0821 9951---0931 9951---0961 9951---1041

BB NOTE: The 7707---326P is a designed approved alternate for this valve.NOTE: All parts with three digit suffix numbers are “Special Order” Parts. These parts are subject to factory availability and require extra

time for delivery.

* Suggested Parts Inventory (2% of Units Installed---Minimum 1 each)

3110 North MeadP.O. Box 19014

Wichita, KS 67204---9014

Evcon Industries, Inc.

1973---106/B Rev.5 (4/97) P.I.

sealed combustion downflow gas furnaces

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