Lennox GHR32 Series Guide

07/01
*2P0701*
504,392M
*P504392M*
Page 1
GHR32
SERIES
Litho U.S.A.
504,392M
7/2001
Supersedes 504,117M
WHAT TO DO IF YOU SMELL GAS:
Do not store or use gasoline or other
flamma le vapors and liquids in the
vicinity of this or any other appliance.
Installation and service must e perĆ
formed y a qualified installer, service
agency or the gas supplier.
DDo not try to light any appliance.
DDo not touch any electrical switch; do not
use any phone in your uilding.
DImmediately call your gas supplier from a
neigh or's phone. Follow the gas suppliĆ
er's instructions.
DIf you cannot reach your gas supplier, call
the fire department.
DExtinguish any open flames.
GAS FURNACE
E2001 Lenno Industries Inc.
Dallas, Te as, USA

If the information in this manual is not
followed exactly, a fire or explosion
may result causing property damage,
personal injury or loss of life.
WARNING

Page 2
GHR32 Parts Identification (Downflow Application Shown)
Figure 1
DuralokPlusTM
HEAT EXCHANGER
ASSEMBLY
HEATING ACCESS
PANEL
BURNERS
BURNER BOX
2-STAGE CONTROL
BOARD
FRESH AIR INTAKE
CONNECTION
CABINET
CONTROL BOX
GAS
VALVE
CONDENSATE TRAP
CONNECTION
COMBUSTION AIR PROVING
(PRESSURE) SWITCH
COMBUSTION AIR
BLOWER
BLOWER ACCESS
DOOR
DOOR INTERLOCK
SWITCH
EXHAUST PIPE
CONNECTION
TOP CAP
FLAME SIGHT
GLASS
BLOWER MOTOR
WARNING
Product contains fi erglass wool.
Distur ing the insulation in this product during
installation, maintenance, or repair will expose you
to fi erglass wool dust. Breathing this may cause
lung cancer. (Fi erglass wool is known to the State
of California to cause cancer.)
Fi erglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this su stance or for further
information, consult material safety data sheets
availa le from address shown elow, or contact your
supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379-9900
Important Directions
1 - Keep the furnace area clear and free of combustible
material, gasoline, and other flammable vapors and
liquids. If installed in an insulated area, furnace must
be kept free of insulating material. Insulating material
may be combustible.
2 - DO NOT obstruct the air inlet. Unit must receive an unĆ
obstructed flow of combustion and ventilating air.
3 - DO NOT store chlorine or fluorine products near unit
or introduce these products into the combustion air.
These products can cause furnace corrosion.
4 - DO NOT draw the return air from a room where
another gas appliance (ie., a water heater) is
installed. Even though this furnace draws its combusĆ
tion air from outside of the structure, other gas apĆ
pliances that share a utility room may not. When return

Page 3
air is drawn from a room, a negative pressure is
created in the room.
If a gas appliance is operating in a room with negative
pressure, the flue products can be pulled back down
the vent pipe and into the room. This reverse flow of
the flue gas may result in incomplete combustion and
the formation of carbon mono ide gas. This to ic gas
might then be distributed through the house by the furĆ
nace duct system.
WARNING
Car on monoxide gas is invisi le, odorless, and toxic.
Your furnace is a gas appliance. It is critical that the gas
supplied to the unit be completely burned to avoid the proĆ
duction of carbon mono ide gas. Complete combustion of
the gas requires, but is not limited to, correct gas pressure
and gas flow rate, adequate combustion, air, and proper
venting.
E posure to this gas can cause personal injury and even
death to all occupants, including pets. Any item that is
powered by or gives off heat from a combustion process
(including lawn mowers, automobiles, and fireplaces) has
the potential to produce carbon mono ide gas. Because
of this, Lenno recommends the use of a carbon mono Ć
ide detector in your home, even if you do not own gas apĆ
pliances. Reliable detectors are available at reasonable
retail prices. Contact your independent Lenno dealer for
more details about this investment in your safety.
Your furnace is designed to meet standards set by naĆ
tional agencies, and to operate safely when properly
installed and maintained. However, the unit's perforĆ
mance can be greatly impacted by the individual installaĆ
tion and the operating environment. It is your responsibilĆ
ity to ensure that this appliance is maintained. Proper
maintenance is critical for your safety and the satisfactoĆ
ry operation of the product. Lenno strongly recomĆ
mends annual inspection and maintenance of this apĆ
pliance. Contact your independent Lenno dealer for an
inspection by a qualified service technician.
WARNING
Do not use this furnace if any part has een underwaĆ
ter. Immediately call a qualified service technician to
inspect the furnace and to replace any part of the
control system and any gas control which has een
under water.
CAUTION
Before attempting to perform any service or mainteĆ
nance, turn the electrical power to unit OFF at the
disconnect switch.
IMPORTANT
Any additions, changes, or conversions required
in order for the appliance to satisfactorily meet the
application needs must e made y a Lennox serĆ
vice technician using factory specified and apĆ
proved parts.
WARNING
If overheating occurs or if gas supply fails to shut off,
shut off the manual gas valve to the appliance efore
shutting off electrical supply.
Lighting Information & Operation
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
BEFORE LIGHTING smell all around the appliance area
for gas. Be sure to smell ne t to the floor because some
gas is heavier than air and will settle on the floor.
The unit is equipped with a gas control knob. Use only your
hand to turn the gas control knob. Never use tools. If the
knob will not push in or turn, do not try to repair it. Call a
qualified service technician. Force or attempted repair may
result in a fire or e plosion.
Placing the GHR32 furnace into operation:
GHR32 units are equipped with a SureLightt ignition sysĆ
tem. Do not attempt to manually light burners on these furĆ
naces. Each time the thermostat calls for heat, the burnĆ
ers will be automatically lit. The ignitor does not get hot
when there is no call for heat on units with the SureLightt
ignition system.
Operating the Gas Valve (Figure 3 and 4)
1 - STOP! Read the safety information at the beginning of
this section.
2 - Set thermostat to its lowest setting. See figure 2.
THERMOSTATS
Figure 2

Page 4
3 - Turn off all electrical power to the unit.
4 - This unit is equipped with an ignition device which auĆ
tomatically lights the burners. Do not try to light it by
hand.
5 - Remove the unit access panel.
6 - Turn gas valve knob to OFF. See figure 3.
Figure 3
HONEYWELL VR8205 Series Gas Valve
Gas Valve Shown In OFF Position
manifold
pressure
tap
high fire adjusting screw
(under cap)
low fire
adjusting screw
(under cap)
inlet pressure tap
7 - Wait five (5) minutes to clear out any gas. If you then
smell gas, STOP! Immediately call your gas supplier
from a neighbor's phone. Follow the gas supplier's inĆ
structions. If you do not smell gas go to ne t step.
8 - Turn gas valve knob to ON. Do not force the knob.
9 - Replace the unit access panel.
10 - Turn on all electrical power to the unit.
11 - Set thermostat to desired setting.
NOTE - When the 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 instrucĆ
tions Turning Off Gas to the Unit" and call your service
technician or gas supplier.
Turning Off Gas to the Unit
1 - Set thermostat to lowest setting.
2 - Turn off all the electrical power to unit if service is to be
performed.
3 - Remove the unit access panel.
4 - Turn gas valve knob to OFF. Do not force the knob.
5 - Replace the unit access panel.
Filters
A filter must be in place anytime the unit is operating. 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
filter should be inspected monthly and cleaned when necĆ
essary to assure proper that the furnace operates properly.
Filters used inside the GHR32 series units are available
from Lenno and must be ordered separately. These foam
filters may be cleaned for reuse. If the filters need to be reĆ
placed, order Lenno part #31J81 for 14 X 25 inch filters for
the GHR32Q-50, -75 and GHR32V-75. Number P-8-7831
is for 20 X 25 inch filters which are used with the GHR32Q,
and V-100 and the GHR32Q-120 units. See figure 4 for reĆ
moving the filter from the unit. Use the following procedure
to clean the filter.
Figure 4
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 the unit.
2 - Remove blower access panel.
3 - Remove filter by pressing side filter clips and pulling
filter up and out.
4 - Clean filter with cold water and a mild soap. Direct waĆ
ter through filter in the opposite direction of air flow.
Remove all soap residue.
5 - Allow the filter to dry, then spray with Filter HandicoatĆ
er (P-8-5069) prior to reinstallation. This spray is availĆ
able from your Lenno dealer.
6 - Replace the filter in the blower compartment under the
rear filter clip. Press on filter sides. The filter clips fle ,
allowing filter to snap into place.
7 - Replace the blower access panel.
WARNING
Blower door must e securely in place when lower
and urners are operating. Gas fumes, which could
contain car on monoxide, can e drawn into living
space resulting in personal injury or death.
Seasonal Inspections
A qualified service technician should inspect the complete
system each season (heating and cooling). The following
maintenance procedures should e conducted y a
qualified service technician. Do not attempt to service
the unit in any way.
During a seasonal check the service technician will inspect
the indoor blower and the burner flames along with the
venting system.
Venting System
Annually (before heating season) inspect furnace venting
system, heat e changer, and burners for corrosion, deteriĆ
oration, or deposits of debris. Remove any obstructions.
Inspect furnace venting system to make sure it is in place,
physically sound, and without holes or blockage. Vent conĆ
nector must be in correct position, sloped upward and be
physically sound without holes.

Page 5
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 guarantee
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 moĆ
tor is pre-lubricated for e tended bearing life. No further luĆ
brication is needed.
Burner Flame
Set thermostat to call for heat. Allow unit to operate for a
few minutes to establish normal burning conditions. Check
burner flame. Flame should be predominantly blue and
strong in appearance.
CAUTION
Periodically look through the flame sight glass to
check the urner flame.
Contact your Lenno dealer for a periodic unit inspection
by a qualified service technician.
Service Reminder
Call your Lenno service technician if unit is inoperative.
Before calling, always check the following to be sure serĆ
vice is required:
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?
Safety Precautions
If you discover any of the following, shut down your
unit, and contact an independent Lennox dealer for an
inspection y a qualified technician.
DIf you repeatedly hear any new or unfamiliar sounds
while your unit is operating, there may be a problem. For
e ample, poorly performing burners can produce unfaĆ
miliar noises.
DIf you smell any unusual odors, your unit may be operatĆ
ing improperly. For e ample, units can give off unfamilĆ
iar odors if components are required to operate in abĆ
normal conditions.
DLook for visible signs of a malfunctioning unit. E amples
include unusual amounts of condensate on windows inĆ
side your house, visibly burnt components, or unusual
accumulation of rust in the unit.
DIf you e perience headache, nausea, fatigue, or dizziĆ
ness, the cause could be e posure to carbon mono ide
gas. This is often misdiagnosed as the flu because
symptoms are similar. If you suffer from flu-like sympĆ
toms that are e aggerated at home, but seem to subĆ
side while you are away from the house, e posure to
carbon mono ide could be the cause.
Your vigilance may pay off in early detection of a problem
before either personal injury or property damage occurs.
Do not hesitate to contact a qualified service technician as
an investment in your well being.
Planned Service
You should e pect a service technician to check the followĆ
ing items during an annual inspection. Power to the unit
must be shut off for the service technician's safety.
Burners- Must be inspected for rust, dirt, or signs of water.
Vent pipe - Must be inspected for dirt, damaged or sagging
unsupported pipe, or disconnected joints.
Unit appearance - Must be inspected for rust, dirt, signs
of water, and burnt or damaged wires components.
Blower access door - Must be properly in place and proĆ
vide a seal between the return air and the room where the
furnace is installed.
Return air duct - Must be properly attached and provide
an airtight seal to unit.
Operating performance - Unit must be observed during
operation to monitor proper performance of the unit and the
vent system.
Com ustion gases - Flue products must be analyzed and
compared to the unit specifications.
Problems detected during the inspection may make it necĆ
essary to temporarily shut down the furnace until the items
can be repaired or replaced.
Pay attention to your furnace. Situations can arise beĆ
tween annual furnace inspections that may result in unsafe
operation. For instance, items innocently stored ne t to the
air inlet may obstruct the combustion air supply. This could
cause incomplete combustion and the production of carĆ
bon mono ide gas.