Reznor VCT Unit Installation Manual - Manual (Page 41)

41
6. Troubleshooting Guide.
START
Ensure gas & electricity
supplies are enabled.
Turn any external timer
to call for heat (if fitted).
Does the Power On
light illuminate?
NO
YES
Set two-stage thermostat to
call for heat at maximum
setting (High Fire).
NO
YES
CHECK: -
1. Operation of any timer or control.
2. External fuses.
3. Voltage is 120VAC.
Is there power to the
burner?
CHECK: -
1. Internal fuse.
2. Integrity of wiring connections.
3. Light.
Does the fan run? NO
YES
CHECK: -
1. Voltage supply to fan terminal F2 is 120VAC.
2. Integrity of wiring connections.
3. Fan.
Do the amber
lights illuminate after a
purge period?
NO
Is there power to the
fan?
YES
NO
CHECK: -
1. Relays 2 & 3.
2. Voltage across terminals A1 & A2 is 24VAC for relay 2 & 3.
3. Integrity of wiring connections.
4. Pressure switch operation.
5. Ignition controller.
Does the pressure
switch close?
YES
NO
CHECK: -
1. Pressure switch wiring connections.
2. Relay 1.
3. Voltage across relay 1 terminals A1 & A2 is
120VAC.
4. Integrity of wiring connections.
5. Amber lights.
6. Ignition controller.
CHECK: -
1. Hose connection to pressure switch.
2. Air inlet, outlet, and emitter tubes for obstructions.
3. Pressure switch operation.
4. Supply voltage 120VAC.
YES