1 … 5

MC

• Ka

rl D

ungs

, Inc

. • A

A...A

2 • E

ditio

n 20

17.0

5 • P

/N 2

6139

3

UL Listed: UL 353File # MH 16628

CSACertificate:CSAC22.2No.14File # 201527

FMApproved:Class3510,3530File#J.I.0D6A1.AF

CommonwealthofMassachusettsApprovedProductApprovalcodeG3-0106-191

AA...A2 Differential Air Pressure SwitchInstallation Instructions

TableofContents

USA CDN

TableofContents . . . . . . . . . . . . . . . . . . . . . . . . Page1Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page1Attention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page1Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page2ModelDescription&PartNumber . . . . . . . . . . Page2Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page2PressureConnection&MountingAA...A2-4. . Page3PressureConnection&MountingAA...A2-6. . Page3InstallationPosition . . . . . . . . . . . . . . . . . . . . . . Page3Application&ConnectionExamples. . . . . . . . Page4Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page4Operation&Adjustment. . . . . . . . . . . . . . . . . . . Page4Maintenance&Testing . . . . . . . . . . . . . . . . . . . . Page5Accessories&Replacement. . . . . . . . . . . . . . . Page5

Approvals

1,2,3... =Action• =Instruction

Explanation of symbols

Attention

On completion of work on thepressureswitch,performaleak-ageandfunctiontest.

Please read the instructionbe-foreinstallingoroperating.Keeptheinstructioninasafeplace.Youfindtheinstructionalsoatwww.dungs.com.Iftheseinstructionsarenotheeded, the resultmaybepersonalinjuryordamagetoproperty.Anyadjustmentandapplication-specificadjustmentvaluesmustbe made in accordance withthe equipment manufacturersinstructions.

[V] [A][Hz] [VA]

Checktheratingsinthespecifica-tionstoverifythattheyaresuit-ableforyourapplication.

IFGCCSAUL

ANSINFPA

This product is intended forinstallations covered by, butnotlimitedto,thefollowingfuelgascodesandstandards:NFPA54,IFGC(InternationalFuelGasCode)orCSAB149.1(forCana-da)or the followingequipmentcodesandstandards:NFPA37,NFPA85,NFPA86,ANSIZ83.4/CSA3.7,ANSI Z83.18/CSA4.9,ANSIZ21.13,CSD-1,UL795,CSAB149.1orCSAB149.3

Theinstallationandmaintenanceof this product must be doneunderthesupervisionofanex-periencedandtrainedspecialist.Neverperformworkifgaspres-sure or power is applied, or inthepresenceofanopenflame.

Safetyfirst

O.K.

3 … 52 … 5

MC

• Ka

rl D

ungs

, Inc

. • A

A...A

2 • E

ditio

n 20

17.0

5 • P

/N 2

6139

3

Specification

Max.OperatingPressureMOP = 7 PSI (500 mbar)

Ambient/MediumTemperature-40 °F ... +140 °F(-40 °C … +60 °C)

GasesAir and non-aggressive gases only. Not suitable for natural gas, pro-pane, butane or other combustable gases.MaterialsincontactwithGasHousing: PolycarbonateSwitch: PolycarbonateDiaphragm: NBR-based rubberSwitching contact: Silver (Ag)

°F

0-40

+140

Gas

AA...A2 SPDT differential pressure switch in pressure and vacuum ranges. The differential pressure acts via the diaphragm against the force of the setting spring on the microswitch. The pressure switch operates without any auxiliary power.

ContactRating5 A resistive, 3 A inductive @ 120 VAC1 A max. @ 12 - 48 VDC

ElectricalConnectionScrew terminals via 1/2” NPT conduit connection

EnclosureNEMA Type 4

Ag

[A]

SwitchSPDTSwitchactionPressure, vacuum of differential pressure switch

[V] [A] [Hz] [VA]

[PSI]

ModelDescription&PartNumberType Version Description OrderNo. Settingrange

in.W.C.Switchinghysteresisin.W.C.

FactoryCalibration

AA-A2-4-…pressureswitch

AA-A2-4-2AA-A2-4-3AA-A2-4-5AA-A2-4-6

Hose connectionHose connectionHose connectionHose connection

266910266911266912266913

0.16 - 1.20 0.40 - 4.00 2.00 - 20.0012.00 - 60.00

≤ 0.12≤ 0.20≤ 0.40≤ 1.2

AA-A2-6-…pressureswitch

AA-A2-6-2AA-A2-6-3AA-A2-6-5AA-A2-6-6

Threaded connectionThreaded connectionThreaded connectionThreaded connection

266932266934266936266938

0.16 - 1.20 0.40 - 4.00 2.00 - 20.0012.00 - 60.00

≤ 0.12≤ 0.20≤ 0.40≤ 1.2

Operation

Setpoint toleranceUpper switchingpressure

Fallin

g

Risi

ng

Adju

stm

ent a

s pr

essu

re ri

ses

Pressureat meter

Switc

hing

hys

tere

sis

Δp

Lower switchingpressure

Definitionofswitchinghysteresis∆pThe pressure difference between the upper and lower switching pressures.

NEMA

SPDT

3 … 52 … 5

MC

• Ka

rl D

ungs

, Inc

. • A

A...A

2 • E

ditio

n 20

17.0

5 • P

/N 2

6139

3

(1)

(2)

1/2” NPT

AA...A2-4HoseConnection(1) Pressure connection (+) Ø 0.18” (2) Pressure connection (–) Ø 0.18”

AA...A2-4MountingProcedure• Use suitable hoses for the medium.• Use a maximum 5/32” ID. hose• Secure the hoses with a cable tie or a cable clip.

PressureConnection&MountingAA...A2-4

AA...A2-6ThreadedConnection• Pressure connection (+) 1/4” NPT• Pressure connection (–) 1/8” NPT• Test nipple p (+) Ø 0.18”

AA...A2-6MountingProcedure• Apply good quality pipe sealant to the male threads only.• Use 13/16” Wrench to secure the switch to the pipe. DONOTExceed45lb-inofTorqueon1/8”Connections DONOTExceed60lb-inofTorqueon1/4”Connections• After installation is complete, perform a leak test.

Testbutton(forAA-A2-6seriesonly)When the test button is pressed the1/4”NPTpressure con-nection is interrupted and the pressure below the diaphragm is relieved. The pressure switch changes the contact position from NO to NC. When the test button is released, the pressure is built up again and the switch changes to its original position.

PressureConnection&MountingAA...A2-6

(1) 1/4” NPT

(2) 1/8” NPT

(3) Test NippleTest Button

1/2” NPT

(2) 1/8” NPT

Pressureconnectioncanonlybeusedastestnipple.

Standard installation position is vertical upright diaphragm.

When installed horizontally, the pressure switch switches at a pressure higher by approx. 0.2 in. W.C.

When installed upsidedown, the pressure switch switches at a pressure lower by approx. 0.2 in. W.C.

When installed in otherpositions, the pressure switch switches at pressure deviating from the set reference value by max. ± 0.2 in. W.C.

α

α

α

α

Made in Germany

0,4

2,1

0,6

0,9

1,2

1,5

1,82,4

2,73

in. W.C.

AA...A2

AdjustmentThe scale indicates the setpoint when switch is mounted in the vertical position and increasing pressure.

InstallationPosition

5 … 54…5

MC

• Ka

rl D

ungs

, Inc

. • A

A...A

2 • E

ditio

n 20

17.0

5 • P

/N 2

6139

3

1. Remove the clear cover from the switch.2. Use 14 or 16 AWG wire rated for at least 75 °C.3. Route the wires through the conduit connector.4. Connect the wiring to the appropriate screw terminals.5. Replace the clear cover from the switch.

AA...A2switchingfunction

Aspressurerisesabovesetpoint:1 NC opens, 2 NO closes

Aspressurefallsbelowsetpoint:2 NO opens, 1 NC closes

Wiring

Operation&AdjustmentAdjustingtheSetPoint1. Remove the clear cover � from the switch.2. Adjust the switch to the desired set point by turning the

dial. The white arrow on the dial indicates the set point �.3. After adjusting the set point, verify that the pressure switch

operates as intended by using an accurate pressure gauge connected upstram of the switch.

4. Replace the clear cover.

AutomaticResetandOperationThe NC contact of the AA...A2 breaks when pressure rises above the set point. It makes automatically when pressure falls below set point.

Allwiringmust complywith local electricalcodes,ordinancesandregulations.

Donotexceedtheswitchratingsgiveninthespecificationsandontheswitch.

Medium Pressure

Application&ConnectionExamples

SystemvacuummonitorAA...A2 is connected to the air duct with the p2 (-) connection. p1 (+) is not con-nected with the air duct.Do not seal the p1 (+) connection; it must be open to the atmosphere.

FiltermonitoringTo monitor a filter, the AA...A2 can be connected as shown above.

BlowermonitoringFor blower monitoring, connect con-nection p1 (+) to the air duct on the downstream side of the blower and con-nection p2 (-) to the air duct upstream of the blower.

Note:ForNFPA86,amanualresetmayberequiredifthisswitchtripsduringoperation.

Connectionp1must remain open

Connectionp2 Connectionp1 Connectionp2 Connectionp2 Connectionp1

Prevent dirt from enteringintothedevicethroughcon-

nectionp1(+)

� �

5 … 54…5

MC

• Ka

rl D

ungs

, Inc

. • A

A...A

2 • E

ditio

n 20

17.0

5 • P

/N 2

6139

3

AnnuallychecktheswitchforproperoperationSetPointCalibration• Connect a meter capable of reading +/- 0.1 ohms to the NC

and COM contacts.• Measure the resistance across the NC and COM contacts.

If the resistance is more than 1.0 ohm, the switch switch should be replaced, since this indicates that the switch contacts are starting to either corrode or carbonizing.

Maintenance&Testing• Apply appressure to the + air pressure connection, and

confirm that the NC contact breaks when pressure rises above the set point and that the NO contact makes. the NC contact will make automatically when pressure falls below the set point pressure.

• Connect a meter capable or reading +/- 0.1 ohms to the NO and COM contacts.

• Measure the resistance across the NO and COM contacts. If the resistance is more than 1.0 ohm, the switch switch should be replaced, since this indicates that the switch contacts are starting to either corrode or carbonizing.

Accessories&ReplacementAccessoryforpressureswitch OrderNo.Klima-Set(Ductmountingkit) 258247Mountingplate(flatplastic) 230301 (recommended mounting bracket)Mountingbracket(plastic) 230273 (optional mounting bracket)Mountingbracket(metal) 230288 (optional mounting bracket)Replacementcover(Includesscrewsando-rings) 228732120VAClightmountingkit(orange) 231772120VAClightonly(orange) 244156 (for switches with kit 231772 already installed)24VDC/VAClightmountingset(orange) 23177424VAClightmountingset(green) 248240ReplacementconduitadapterPG11to1/2”NPT 220566ReplacementconduitadapterM20to1/2”NPT 240671DINconnector(femaleplug) 210318MaleplugforDINconnector3PINwithout 219659

KarlDungsGmbH&Co.KGP.O.Box1229D-73602Schorndorf,GermanyPhone+49(0)7181-804-0Fax +49(0)7181-804-166e-mailinfo@dungs.comInternethttp://www.dungs.com

KarlDungs,Inc.3890PheasantRidgeDriveNESuite150Blaine,MN55449,U.S.A.Phone763582-1700Fax 763582-1799e-mailinfo@karldungsusa.comInternethttp://www.dungs.com/usa/

We reserve the right to make modifications in the course of technical development.