Haier GE NF96DS Service Manual page 49

Winterizing and Condensate Trap Care
1. Turn off power to the furnace.
2. Have a shallow pan ready to empty condensate water.
3. Remove the clean out cap from the condensate trap and
empty water. Inspect the trap then reinstall the clean out
cap.
Condensate Hose Screens (Figure 56)
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.
Figure 56. Condensate Hose Screens
Cleaning Heat Exchanger
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 wires from the gas valve.
4. Remove gas supply line connected to gas valve.
Remove the burner box cover (if equipped) 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. Loosen clamps at vent elbow. Disconnect condensate
drain tubing from flue collar. and remove the vent elbow.
8. Loosen clamps and remove combustion air intake
flexible connector if equipped.
31-5000729 Rev. 0
Hose
9. 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.
10. Mark and disconnect all combustion air pressure tubing
from cold end header collector box.
11. Mark and remove wires from pressure switch assembly.
Remove pressure switch assembly. Keep tubing
attached to pressure switch assembly.
12. Disconnect the 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.
13. Remove electrical junction box from the side of the
furnace.
14. Disconnect condensate line from cold end header box.
Remove cold end header box.
15. Loosen clamps on exhaust and air intake pipe seal
plate. Slide exhaust and intake pipes up and out to clear
blower deck. Remove exhaust and air intake pipe seal
plate.
16. Mark and disconnect any remaining wiring to heating
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 which secure
vestibule panel and heat exchanger assembly to cabinet.
Remove two screws from blower rail which secure top
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
engaged properly into the support bracket on the blower
deck. Remove the indoor blower to view this area
through the blower opening.
23. Re-secure the supporting screws along the vestibule
sides and top to the cabinet.
24. Reinstall cabinet screws on front flange at blower deck.
25. Reinstall the primary limit on the vestibule panel.
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