508134-01
Issue 2045
Page 51 of 56
29. Reinstall the cold end header box.
30.
Reinstall the combustion air inducer. Reconnect the
combustion air inducer to the wire harness.
31.
Reinstall pressure switch assembly and reconnect
pressure switch wiring.
32.
Carefully connect combustion air pressure switch
tubing from pressure switches to proper ports on cold
end header collector box.
33.
Reinstall condensate trap.
34.
Secure burner box assembly to vestibule panel using
four existing screws. Make sure burners line up in
center of burner ports.
35.
Reconnect exhaust piping and exhaust drain tubing.
36.
Reconnect flame roll-out switch wires.
37. Reconnect sensor wire and reconnect 2-pin plug from
ignitor.
38.
Reinstall gas valve manifold assembly. Reconnect gas
supply line to gas valve.
39. Reinstall burner box cover if equipped.
40.
Reconnect plug to gas valve.
41.
Replace the blower compartment access panel.
42.
Follow lighting instructions on unit nameplate to light
and operate furnace for 5 minutes to ensure the
furnace is operating properly.
43.
Check all piping connections, factory and field, for gas
leaks. Use a leak detecting solution or other preferred
means.
Some soaps used for leak detection are corrosive to
certain metals. Carefully rinse piping thoroughly after
leak test has been completed. Do not use matches,
candles, flame or other sources of ignition to check for
gas leaks.
CAUTION
44.
Replace access panel.
Cleaning the Burner Assembly (if needed)
1.
Turn off electrical and gas power supplies to furnace.
Remove upper and lower furnace access panels.
2.
Disconnect the 2-pin plug from the gas valve.
3.
Remove the burner box cover (if equipped).
4.
Disconnect the gas supply line from the gas valve.
Remove gas valve/manifold assembly.
5.
Loosen clamps and remove combustion air intake
flexible connector (if equipped).
6.
Mark and disconnect sensor wire from the sensor.
Disconnect plug from the ignitor at the burner box.
7. Remove four screws which secure burner box
assembly to vest panel. Remove burner box from the
unit.
8.
Use the soft brush attachment on a vacuum cleaner
to gently clean the face of the burners. Visually
inspect the inside of the burners and crossovers for
any blockage caused by foreign matter. Remove any
blockage.
9. Reinstall the burner box assembly using the existing
four screws. Make sure that the burners line up in the
center of the burner ports.
10.
Reconnect the sensor wire and reconnect the 2-pin
plug to the ignitor wiring harness.
11.
Reinstall combustion air intake flexible connector (if
equipped), secure using existing clamps.
12.
Reinstall the gas valve manifold assembly. Reconnect
the gas supply line to the gas valve. Reinstall the
burner box cover.
13.
Reconnect plug to gas valve.
14.
Replace the blower compartment access panel.
15.
Refer to instruction on verifying gas and electrical
connections when re-establishing supplies.
16.
Follow lighting instructions to light and operate furnace
for 5 minutes to ensure that heat exchanger is clean
and dry and that furnace is operating properly.
17. Replace access panel.
