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NOTE - After any heavy snow, ice or frozen fog event the
furnace vent pipes may become restricted. Always check
the vent system and remove any snow or ice that may be
obstructing the plastic intake or exhaust pipes.
Electrical
WARNING
Electric Shock Hazard. Can cause
injury or death. Unit must be properly
grounded in accordance with national
and local codes.
WARNING
Fire Hazard. Use of aluminum wire with this product
may result in a fire, causing property damage,
severe injury or death. Use copper wire only with
this product.
CAUTION
Failure to use properly sized wiring and circuit
breaker may result in property damage. Size wiring
and circuit breaker(s) per Product Specifications
bulletin (EHB) and unit rating plate.
1 - Check all wiring for loose connections.
2 - Check for the correct voltage at the furnace (furnace
operating).
3 - Check amp-draw on the blower motor.
Motor Nameplate__________Actual__________
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.
Condensate Hose Screen (Figure 51)
Check the condensate hose screen for blockage and clean
if necessary.
1 - Turn off power to the unit.
2 - Remove hose from cold end header box. Twist and pull
screen to remove.
3 - Inspect screen and rinse with tap water if needed.
4 - Reinstall screen and turn on power to unit.
FIGURE 51
Condensate Hose Screen
Hose
Cleaning Heat Exchanger
If cleaning the heat exchanger becomes necessary, follow
the below procedures and refer to figure 1 when disassem
bling unit. Use papers or protective covering in front of fur
nace 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. Re
move 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 exit
ing exhaust pipe for removal of the fitting.
11 - Mark and disconnect all combustion air pressure tub
ing from cold end header collector box.
12 - Mark and remove wires from pressure switches. Re
move pressure switches. Keep tubing attached to
pressure switches.
13 - Disconnect the 4‐pin plug from the combustion air in
ducer. Remove two screws which secure combustion
air inducer to collector box. Remove combustion air in
ducer assembly. Remove ground wire from vest panel.
14 - Remove electrical junction box from the side of the fur
nace.
15 - Remove cold end header box.
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 and bottom
which secure vestibule panel and heat exchanger as
sembly 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 as
sembly.
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