Appendix A-1 - Vent Damper Harness - Dunkirk DXL-125 Installation, Operation And Maintenance Manual

Dxl series ii. cast iron gas fired boilers for forced hot water

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Table Of Contents

Table of Contents

A.1 Vent Damper Harness - Molex Plugs

WARNING

Do Not negate the action of any existing safety

orperational controls. Avoidance of these instructions

could result in death or serious injury.

When servicing controls, all wires must be

Note

labeled prior to disconnection. Wiring errors

can cause improper and dangerous operation.

Do not turn damper open manually or motor

damage will result and void all warranties, use

the service switch.

DO NOT CUT PLUG OFF OF DAMPER MOTOR

ASSEMBLY OR WARRANTY WILL BE VOID.

Check Molex Plugs on Vent Damper Harness:

Damper wiring harness is made up of 4

Note

individual colored wires, Brown, Black, Yellow,

and Orange (refer to drawing below).

Disconnect thermostat wires.

Use the two diagrams below to confirm the Molex plugs

on each end of the damper harness are wired and

operating properly.

Damper end of wiring harness:

A. Hold plug in hand with wiring harness behind Molex

with "V" slot on top. Verify wire colors are in

proper position.

B. Take reading across brown and black wires in Molex

plug, using test meter set for AC volts. 24 volts

should be present.

IF NOT, source of the problem is not in

damper; check line voltage and 24 volt supply.

ii. If 24 volts is present across brown and black,

continue to step iii.

iii. Reconnect thermostat wires and turn up heat

setting.

iv. Check voltage across black and orange wires

in Molex plug. 24 volts AC should be present:

• IF NOT, source problem is not the damper.

• If 24 volts is present continue on to step v.

v. Place jumper wire across orange and yellow

wires in Molex plug (see Below). This will

create bypass of the damper, boiler should

then ignite.

• IF NOT, source problem is not the damper.

Go to "Aquastat end of wiring harness'

• If boiler ignites: Go to section A.2 "Vent

Damper Troubleshooting Guide". NOTE:

Prior to replacing the damper, be sure

the problem is not with wire connections

between damper and wiring harness.