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Filters
All air lters are installed external to the unit. Filters should
be inspected monthly. Clean or replace the lters when
necessary to ensure proper furnace operation. TABLE 30
lists recommended lter sizes.
IMPORTANT
If a high eciency lter is being installed as part of
this system to ensure better indoor air quality, the
lter must be properly sized. High eciency lters
have a higher static pressure drop than standard
eciency 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).
TABLE 30
Furnace
Cabinet Width
Filter Size
16 x 25 x 1
17-1/2”
21”
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
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 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 o 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 56
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 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 ame roll-out switches.
7 - Loosen clamps at vent elbow. Disconnect
condensate drain tubing from ue collar. and
remove the vent elbow.
8 - Loosen clamps and remove combustion air intake
exible connector if equipped.
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.
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