24
8. 30 seconds from the gas valve opening the main
blower starts and continues to run.
9.
When the thermostat is satisfi ed, the “W” terminal
on the integrated control is de-energized.
10. The gas valve circuit is de-energized and the gas
valve closes.
11. The inducer motor will continue to run for the post
purge period of 25 seconds.
12. The main blower will continue to run for the blower
off delay of 135 seconds.
13. After the “blower off” timer has been satisfi ed, the
integrated control de-energizes the main circulating
blower circuit.
Unit Fails to Operate
If the unit does not operate in the cooling mode, be certain
to check the following:
1.
The thermostat is operating properly.
2.
Electrical power to the unit is turned on.
3.
The fi lters are not dirty.
4.
The service doors are in place.
5.
The 3 amp fuse is operational.
6. The anti-short cycle timer’s 5-minute cycle has
fi nished for single phase units.
If the unit does not operate in the heating mode, be certain
to check the following:
1.
The thermostat is operating properly.
2.
Electrical power to the unit is turned on.
3.
The fi lters are not dirty.
4.
The gas is turned on.
5.
The manual shut-off valve is open.
6.
The service doors are in place.
7.
The fl ame roll-out control is closed.
8. Refer to the diagnostic code table on the wiring
diagram or see
Table 9
.
9.
The 5 amp fuse is operational.
Power On
On
Limit Circuit Open
1 Flash
Pressure Switch Stuck Open
2 Flash
Pressure Switch Stuck Closed
3 Flash
Ignition Failure (Check Ground)
4 Flash
230 VAC & Neutral Reversed or No Ground 5 Flash
False Flame or Gas Relay Shorted
Continuous Flash
Power Off
Off
Low Flame Sensor Signal
Continuous Flash
Flame Present
On
FAULT
CONDITION
STATUS
LIGHT (RED)
Table 9. Diagnostic Codes.
FAULT
CONDITION
STATUS LIGHT
(YELLOW)
