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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 monoxide gas. This toxic gas
might then be distributed through the house by the furĆ
nace duct system.
WARNING
Carbon monoxide gas is invisible, 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 monoxide 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.
Exposure 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 monoxide gas. Because
of this, Lennox recommends the use of a carbon monoxĆ
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 Lennox 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. Lennox strongly recomĆ
mends annual inspection and maintenance of this apĆ
pliance. Contact your independent Lennox dealer for an
inspection by a qualified service technician.
WARNING
Do not use this furnace if any part has been 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 been
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 be made by 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 before
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 next 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 explosion.
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