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7. If any status codes are flashed, refer to status code label on
unit blower door.
8. Turn thermostat fan switch to "ON", "Continuous" or jump-
er R to G terminals at furnace control board.
9. Check for air leakage around cell panel. It may be necessary
to remove heat exchanger assembly and top gasket between
cell panel and furnace casing top plate. Re- -install and re- -
check for blower air leaks.
10. Remove jumper(s) or set thermostat fan to "Auto" or
"OFF".
11. Release blower door switch.
12. Install blower access door.
13. Set thermostat to call for heat.
14. Allow unit to initiate a complete call for heat cycle.
15. Check for air leakage around collector box. A whistling
noise may indicate air leak in collector box seal.
NOTE: If there is a severe air leak in the collector box seal,
pressure switch may not close or will re- -open, resulting in no
ignition or erratic burner operation.
NOTE: Heat Exchanger failure may have been caused by one or
more of the following conditions. As part of the system check- -out,
verify that the following conditions are not affecting the operation
of the furnace:
S Short Cycling- -Defective thermostat:
anticipator setting, dirty filter or over- -sized furnace.
S Under firing/low Btu input: Set manifold pressure and verify
S Over- -firing/high Btu input: Set manifold pressure and verify
S Low temperature rise: Set unit for correct temperature rise range
S Contaminated combustion air: Remove contaminates or provide
S Excessive amounts of outside ventilation air: Return air
S Incorrect venting or termination: Recirculation of products of
Incorrect thermostat
Fig. 1 - - Collector Box Gasket Condensate Trap
6
firing rate as shown on rating plate by clocking the gas meter.
firing rate as shown on rating plate by clocking the gas meter.
as shown on unit rating plate.
ample fresh air for combustion.
temperature cannot be below 60 degrees F for extended periods of
time.
combustion into the combustion air pipe can damage the furnace.
Verify proper venting and vent termination per installation
instructions. For additional information, and a complete sequence
of furnace operation, refer to furnace Installation, Start- -Up and
Operating Instructions.
16. After System Check- -out is complete, set thermostat below
room temperature.
17. Verify that burner shuts down and blower completes selec-
ted off delay time.
18. Verify furnace operates properly and set thermostat to de-
sired room temperature.
19. Re- -install outer door.
CONDENSATE TRAP
APPLY NEW GASKET TO COLLEC-
TOR BOX BEFORE RE-INSTALLING
CONDENSATE TRAP
REMOVE OLD GASKET
A11442
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