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IMPORTANT
If a higheciency lter is being installed as part
of this system to ensure better indoor air quality,
the lter must be properly sized. Higheciency
lters have a higher static pressure drop than
standardeciency glass/foam lters. If the pressure
drop is too great, system capacity and performance
may be reduced.
The pressure drop may also cause the limit to trip
more frequently during the winter and the indoor
coil to freeze in the summer, resulting in an increase
in the number of service calls.
Before using any lter with this system, check the
specications provided by the lter manufacturer
against the data given in the appropriate Lennox
Product Specications bulletin. Additional
information is provided in Service and Application
Note ACC002 (August 2000).
Exhaust and air intake pipes
Check the exhaust and air intake pipes and all connec-
tions for tightness and to make sure there is no blockage.
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 re, causing property damage,
severe injury or death. Use copper wire only withthis
product.
CAUTION
Failure to use properly sized wiring and circuit
breaker may result in property damage. Size wiring
and circuit breaker(s) per Product Specications
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 o 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 rell trap with water.
Condensate Hose Screen (FIGURE 58)
Check the condensate hose screen for blockage and
clean if necessary.
1 - Turn o 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.
Condensate Hose Screen
Hose
FIGURE 58
Cleaning Heat Exchanger
If cleaning the heat exchanger becomes necessary, follow
the below procedures and refer to gure 1 when disas-
sembling unit. Use papers or protective covering in front of
furnace while removing heat exchanger assembly.
1 - Turn o 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 ame 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 exible exhaust coupling.
9 - Disconnect condensate drain line from the cold end
header box.
10 - Disconnect condensate drain tubing from ue
collar. Remove screws that secures the ue collar
into place. Remove ue collar. It may be necessary
to cut the exiting exhaust pipe for removal of the
tting.
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