Fig. 44 Ð Cooling Charging Chart; 48TJ014
Flue Gas Passageways Ð To inspect the ¯ue col- lector box and upper areas of the heat exchanger:
1.Remove the combustion blower wheel and motor assem- bly according to directions in
2.Remove the ¯ue cover to inspect the heat exchanger.
3.Clean all surfaces as required using a wire brush.
To inspect blower wheel, shine a ¯ashlight into drafthood opening. If cleaning is required, remove motor and wheel as follows:
1.Slide burner access panel out.
2.Remove the 6 screws that attach
3.The blower wheel can be cleaned at this point. If additional cleaning is required, continue with Steps 4 and 5.
4.To remove blower from the motor shaft, remove 2 setscrews.
5.To remove motor, remove the 4 screws that hold blower housing to mounting plate. Remove the motor cooling fan by removing one setscrew. Then remove nuts that hold motor to mounting plate.
6.To reinstall, reverse the procedure outlined above.
Limit Switch Ð Remove blower access panel (Fig. 7). Limit switch is located on the fan deck.
Burner Ignition Ð Unit is equipped with a direct spark ignition 100% lockout system. Integrated Gas Unit Control- ler (IGC) is located in the control box (Fig. 12). Module con- tains a
history) and the indoor (evaporator) fan ON/OFF times will be reset. For additional information, refer to the
If lockout occurs, unit may be adjusted by interrupting power supply to unit for at least 5 seconds.
Table 16 Ð LED Error Code Description*
LED INDICATION | ERROR CODE DESCRIPTION |
ON | Normal Operation |
OFF | Hardware Failure |
1 Flash² | Evaporator Fan On/Off Delay Modi®ed |
2 Flashes | Limit Switch Fault |
3 Flashes | Flame Sense Fault |
4 Flashes | 4 Consecutive Limit Switch Faults |
5 Flashes | Ignition Lockout Fault |
6 Flashes | |
7 Flashes | Rollout Switch Fault |
8 Flashes | Internal Control Fault |
|
|
LED Ð
*A
²Indicates a code that is not an error. The unit will continue to op- erate when this code is displayed.
IMPORTANT: Refer to Troubleshooting Tables
Main Burners Ð At the beginning of each heating sea- son, inspect for deterioration or blockage due to corrosion or other causes. Observe the main burner ¯ames and adjust if necessary.
When working on gas train, do not hit or plug ori®ce spuds.
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