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Condensate Hose Screens (Figure 51)
Check the condensate hose screens for blockage and clean
if necessary.
1. Turn off power to the unit.
2. Remove hoses from cold end header box. Twist and pull
screens to remove.
3. Inspect screens and rinse with tap water if needed.
4. Reinstall screens, reconnect hoses and turn on power
to unit.
Hose
Figure 51. Condensate Hose Screens
Winterizing and Condensate Trap Care
1. Turn off power to the unit.
2. Have a shallow pan ready to empty condensate water.
3. Remove the drain plug from the condensate trap and
empty water. Inspect the trap then reinstall the drain
plug and refill trap with water.
Cleaning the Heat Exchanger and Burner
If cleaning the heat exchanger becomes necessary, follow the
below procedures and refer to Figure 1 when disassembling
unit. Use papers or protective covering in front of furnace
while removing heat exchanger assembly.
1. Turn off electrical and gas supplies to the furnace.
2. Remove the furnace access panels.
3. Disconnect the 2-pin plug from the gas valve.
4. Remove gas supply line connected to gas valve.
Remove the burner box cover and remove gas valve/
manifold assembly.
5. Remove sensor wire from sensor. Disconnect 2-pin plug
from the ignitor.
6. Disconnect wires from flame roll-out switches.
7. Remove four burner box screws at the vestibule panel
and remove burner box. Set burner box assembly aside.
NOTE: If necessary, clean burners at this time. Follow
procedures outlined in Burner Cleaning section.
8. Loosen the clamps to the flexible exhaust coupling.
9. Disconnect condensate drain line from the cold end
header box.
10. Disconnect condensate drain tubing from flue collar.
Remove screws that secures the flue collar into place.
Remove flue collar. It may be necessary to cut the exiting
exhaust pipe for removal of the fitting.
11. Mark and disconnect all combustion air pressure tubing
from cold end header collector box.
12. Mark and remove wires from pressure switches. Remove
pressure switches. Keep tubing attached to pressure
switches.
13. Disconnect the 4-pin plug from the combustion air
inducer. Remove two screws which secure combustion
air inducer to collector box. Remove combustion air
inducer assembly. Remove ground wire from vest panel.
14. Remove cold end header box.
15. Remove electrical junction box from the side of the
furnace.
16. Mark and disconnect any remaining wiring to heating
Hose
compartment components. Disengage strain relief
bushing and pull wiring and bushing through the hole in
the blower deck.
17. Remove the primary limit from the vestibule panel.
18. Remove two screws from the front cabinet flange at
the blower deck. Spread cabinet sides slightly to allow
clearance for removal of heat exchanger.
19. Remove screws along vestibule sides and bottom which
secure vestibule panel and heat exchanger assembly
to cabinet. Remove two screws from blower rail which
secure bottom heat exchanger flange. Remove heat
exchanger from furnace cabinet.
20. Back wash heat exchanger with soapy water solution or
steam. If steam is used it must be below 275°F (135°C) .
21. Thoroughly rinse and drain the heat exchanger. Soap
solutions can be corrosive. Take care to rinse entire
assembly.
22. Reinstall heat exchanger into cabinet making sure that
the clamshells of the heat exchanger assembly are
resting in the support located at the rear of the cabinet.
Remove the indoor blower to view this area through the
blower opening.
23. Re-secure the supporting screws along the vestibule
sides and bottom to the cabinet.
24. Reinstall cabinet screws on front flange at blower deck.
25. Reinstall the primary limit on the vestibule panel.
26. Route heating component wiring through hole in blower
deck and reinsert strain relief bushing.
27. Reinstall electrical junction box.
28. Reinstall the cold end header box.
29. Reinstall the combustion air inducer. Reconnect the
4-pin plug to the wire harness.
Page 60
31-5000723 Rev. 0
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