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FILTERS
A filter must be in place any time the unit is in operation.
The filter may be located in the unit (optional kit) or
installed in a return air grille. Ask your dealer to show
you the filter location. The filter should be inspected
monthly and cleaned when necessary to assure proper
furnace operation.
Filters used inside the G26 series unit are available from
Lennox and must be ordered separately. These foam filĆ
ters may be cleaned for reuse. If replacement is necesĆ
sary, order Lennox part no. 31J81 for 14 X 25 inch filter
for G26Q2-50, Q3-50 and Q3-75 units and P-8-7831 for
20 X 25 inch filter used with G26Q4/5-75 and all sizes of
G26-100 and -125 units. Use the following procedure to
clean filter. Refer to figure 1.
In-Unit Filter with Bottom Return Air
1 - Turn off electric power to furnace.
2 - Remove blower access panel.
3 - Remove filter by pressing side filter clips and pulling
filter up and out. See figure 4.
FIGURE 4
BOTTOM RETURN FILTER INSTALLATION
FURNACE
BASE BOTTOM
REAR FILTER CLIP
RETURN AIR OPENING
SIDE FILTER CLIPS (2)
FURNACE
FRONT
FURNACE
BACK
4 - Clean filter with cold water and a mild soap. Direct
water through filter in the opposite direction of air
flow. Remove all soap residue.
5 - Allow filter to dry then spray with filter handicoater
(P-8-5069), available from your Lennox dealer, prior
to reinstallation.
6 - Place filter in bottom of blower compartment beĆ
neath 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 resulting in personal injuĆ
ry or death.
Side Return Air Filter (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
water through filter in the opposite direction of air
flow. Allow filter to dry, then spray with filter handiĆ
coater, available from your Lennox dealer, prior to reĆ
installation.
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 serĆ
vice the unit in any way.
During a seasonal check the service technician will inĆ
spect the indoor blower, the burner flame and the venting
system.
Venting System
Annually (before heating season) inspect furnace ventĆ
ing system, heat exchanger and burners for corrosion,
deterioration, or deposits of debris. Remove any obĆ
structions.
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 containing the furnace.
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