Lennox GHR26 series Guide

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PRODUCT LITERATURE
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DuralokPlus
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HEAT EXCHANGER
ASSEMBLY
BURNER
BOX
CABINET
CONDENSATE TRAP
CONNECTION
COMBUSTION AIR PROVING
(PRESSURE) SWITCH
EXHAUST PIPE
CONNECTION
BLOWER MOTOR
HEATING ACCESS
PANEL
BURNERS
INTEGRATED
IGNITION/BLOWER
CONTROL
FRESH AIR INTAKE
CONNECTION
CONTROL BOX
GAS
VALVE
COMBUSTION AIR
BLOWER
BLOWER ACCESS
DOOR
DOOR INTERLOCK
SWITCH
TOP CAP
FLAME SIGHT
GLASS
FILTER
FIGURE 1
WARNING
Product contains fiberglass wool.
Disturbing the insulation in this product during
installation, maintenance, or repair will expose
you to fiberglass wool. Breathing this may cause
lung cancer. (Fiberglass wool is known to the
State of California to cause cancer.)
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact
your supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379--9900
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1-- Keep the furnace area clear and free of combus-
tible material, gasoline, and other flammable va-
pors and liquids. If installed in an insulated area,
furnace must be kept free ofinsulating material. In-
sulating material may be combustible.
2-- DO NOT obstruct air flow to unit. Unit must re-
ceive an unobstructed flow of combustion and
ventilating air.
3-- DO NOT store chlorine or fluorine products near
unit or introduce these products into the combus-
tion air. These products can cause furnace corro-
sion.
WARNING
If overheating occurs or if gas supply fails to shut
off, shut off the manual gas valve to the appliance
before shutting off electrical supply.
WARNING
Do not use this furnace if any part has been under-
water. Immediately call a qualified service techni-
cian to inspect the furnace and to replace any part
of the control system and any gas control which
has been under water.
CAUTION
Before attempting to perform any service or main-
tenance, turn the electrical power to unit OFF at
disconnect switch.

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IMPORTANT
Any additions, changes, or conversions required
in order for the appliance to satisfactorily meet the
application needs must be made by a Lennox ser-
vice technician using factory specified and ap-
proved parts.
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BEFORE LIGHTING smell all around the appliance area
for gas. Be sure to smell next to the floor because some
gas is heavier than air and will settle on the floor.
Unit may be equipped with either a gas control knob or
lever. Use only your handto push in or turn thegas con-
trol knob or move the gas control lever. Never use
tools. If the knob will not push in or turn or if lever will
not move by hand, do not try to repair it, call a qualified
service technician. Force or attempted repair may re-
sult in a fire or explosion.
To place GHR26 furnace into operation:
GHR26 units are equipped with a SureLight ignition sys-
tem. Do not attempt to manually light burners on these
furnaces. Each time thermostat calls for heat, the burners
will be automatically lit. The ignitor does not get hot
when there is no call for heat on units with SureLight igni-
tion system.
Gas Valve Operation (Figure3)
1-- STOP ! Read the safety information at the begin-
ning of this section.
2-- Set thermostat to lowest setting. See figure 2.
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3-- Turn off all electrical power to appliance.
4-- This appliance is equipped with an ignition device
which automatically lights the burners. Do not try
to light by hand.
5-- Remove unit access panel.
6-- On Honeywell VR8205 gas valves, turn knob on
gas valve clockwise to
OFF . For White Rodg-
ers 36E gas valves, move switch to OFF .Donot
force. See figure 3.
21
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HONEYWELL VR8205 SERIES GAS VALVE
GAS VALVE SHOWN IN OFF POSITION
WHITE RODGERS 36E GAS VALVE
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GAS VALVE SHOWN IN OFF POSITION
7-- Wait five (5) minutes to clear out any gas. If you
then smell gas, STOP ! Immediately call your gas
supplier fromaneighbors phone.Follow thegas
suppliers instructions. If you do notsmell gas go
to next step.
8-- For Honeywell VR8205 gas valves, turn knob on
gas valve counterclockwise to
ON . For White
Rodgers 36E gas valves, move switch to ON .Do
not force.
9-- Replace unit access panel.
10-- Turn on all electrical power to unit.
11-- Set thermostat to desired setting.
NOTE--When unit is first started, steps 1 through 11
may need to be repeated to purge air from pilot line.
12-- If the appliance still will not operate, follow the
instructions To Turn Off Gas To Unit and call
your service technician or gas supplier.
To Turn Off Gas To Unit
1-- Set thermostat to lowest setting.
2-- Turn off all electrical power to unit if service is to be
performed.
3-- Remove unit access panel.
4-- For Honeywell VR8205 gas valves, turn knob on
gas valve counterclockwise to
ON . For White
Rodgers 36E gas valves, move switch to ON .Do
not force.
5-- Replace unit access panel.

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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?