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A filter must be in place anytime the unit is in opera-
tion. The filter may be located in the unit or installed
in a return air grille. Ask your dealer to show you the
filter location. The filtershould be inspected monthly
and cleaned when necessary to assure proper fur-
nace operation.
FiltersusedinsidetheGHR26series unitareavailable
from Lennox and must be ordered separately. These
foam filters may be cleaned for reuse. If replacement
is necessary, order Lennox part no. 31J81 for 14 X 25
inch filter for GHR26Q2--50 and --75 and P--8--7831 for
20 X 25 inch filter for all sizes of GHR26--100 and --125
units. See figure 4 for removing filter from unit. Use
the following procedure to clean filter.
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Press up on side filter
clip to release filter
(One on each side of
cabinet)
FILTER
CABINET
FILTER
CLIP
BACK FILTER CLIP
FILTER
SIDE FILTER
CLIP DETAIL
CABINET
FILTER
CLIP
Cleaning Filter
1-- Turn off electric power to furnace.
2-- Remove blower access panel.
3-- Remove filter by pressing side filter clips and pull-
ing filter up and out.
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 drythen spray with filterhandicoater
(P--8--5069), available from your Lennox dealer,
prior to reinstallation.
6-- Replace filter in blower compartment under rear
filter clip. Press on filter sides. Filter clips flex al-
lowing filter to snap into place.
7-- Replace blower access panel.
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A
qualified service technician should inspect the com-
plete system each season (heating and cooling). The
following maintenance procedures should be con-
ducted by a qualified service technician.
Do not at-
tempt to service the unit in any way.
During a seasonal check the service technician will in-
spect the indoor blower, the pilot and burner flames
along with the venting system.
Venting System
Annually (before heating season) inspect furnace
venting system, heat exchanger, burners and pilot
forcorrosion,deterioration,ordepositsofdebris.Re-
move any obstructions.
Inspect furnace venting system to make sure it is in
place, physically sound, and without holes or block-
age. Vent connector must be in correct position,
sloped upward and be physically sound without holes.
Inspect furnace return air duct connection to ensure
duct is sealed to the furnace and terminates outside the
space containing the furnace.
Inspect the physical support of the furnace to guaran-
tee that it is sound without sagging, cracks or gaps
around base and it maintains seal between base and
support.
Inspect and clean the condensate traps and drain.
Blower
Check and clean blower wheel for any debris. Blower
motor is pre--lubricated for extended bearing life. No
further lubrication is needed.
Burner Flame
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Set thermostat to call for heat. Allow unit to operate for
a few minutes to establish normal burning conditions.
Check burner flame by observation. Flame should be
predominantly blue in color and strong in appearance.
Contact your Lennox dealer for a periodic unit inspec-
tion by a qualified service technician.
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1-- Check that electrical disconnect switches are
ON.
2-- Check room thermostat for proper setting.
3-- Replace any blown fuses or reset circuit breakers.
4-- Gas valve should be
ON
.
5-- Air filter should not be plugged limiting air flow.
6-- Is gas turned on at meter?
7-- Is manual main shut--off valve open?
