Filter
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Page 5
6- Place filter in bottom of blower compartment beneath
rear filter clip. Press down on filter sides. Filter clips
flex allowing filter to snap into place.
7- Replace blower access panel.
WARNING
Blower door must be securely in place when blower
and burners are operating. Gas fumes, which could
contain carbon monoxide, can be drawn into living
space which could cause personal injury or death.
In-Unit Filter with Side Return Air (See Figure 5)
1- Turn off electric power to furnace.
2- Locate the filter door of the filter rack assembly.
3- Using the filter door pins, pull filter door, with filter atĆ
tached, out of filter rack assembly. Remove filter door
from filter by pulling up on securing tabs.
4- Clean filter with cold water and a mild soap. Direct waĆ
ter through filter in the opposite direction of air flow. AlĆ
low filter to dry then spray with filter handicoater, availĆ
able from your Lennox dealer, prior to reinstallation.
5- Position filter door on end of filter so that the thumb
tab side of the filter door is away from the furnace.
Check for correct air flow position. Squeeze thumb
tabs to secure filter to door.
6- Guide filter and filter door into the filter rack
installed on side of furnace. Push door into filter
rack until secure.
FIGURE 5
REMOVING / REPLACING FILTER DOOR
FILTER DOOR
FILTER
FILTER DOOR
PIN
TAB
TAB
FILTER DOOR
PIN
Seasonal Inspections
A qualified service technician should inspect the comĆ
plete system each season (heating and cooling). The folĆ
lowing maintenance procedures should be conducted by
a qualified service technician. Do not attempt to service
the unit in any way.
Venting System
Annually (before heating season) inspect furnace venting
system, draft hood, vent cap, heat exchanger, and burners
for corrosion, deterioration, or deposits of debris. Remove
any obstructions.
Inspect furnace venting system to make sure it is in
place, physically sound, and without holes, corrosion, or
blockage. Vent connector must be in correct position,
sloped upward and be physically sound without holes or
excessive corrosion.
Inspect furnace return air duct connection to ensure duct is
sealed to the furnace and terminates outside the space conĆ
taining the furnace.
Inspect the physical support of the furnace to guarantee that
it is sound without sagging, cracks or gaps around base and
it maintains seal between base and support.
During a seasonal check the service technician will inspect
the indoor blower and the burner flames along with the ventĆ
ing system.
Blower
Check and clean blower wheel for any debris. Blower motor
is pre-lubricated for extended bearing life. No further lubricaĆ
tion is needed.
Burner Flame
Burner Flame
Start burner and allow to operate for a few minutes to esĆ
tablish normal burning conditions. Check burner flame by
observation. Flame should be predominantly blue and
strong in appearance.
CAUTION
To ensure proper operation, a qualified technician
should periodically check the burner flame.