Lennox International Inc. GSR21Q - Manual (Page 2)

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FIGURE 1
BLOWER
HEAT
EXCHANGER
INTAKE
CONNECTION
EXHAUST
CONNECTION
CONTROL
BOX
FILTER
PRESSURE
SWITCH
SPARK
PLUG
FLAME
SENSOR
AIR
FLAPPER
VALVE
PURGE
BLOWER
(Horizontal Application Shown)
ELECTRONIC
IGNITION
VARIABLE SPEED BLOWER MO-
TOR
USED ON GSR21V UNITS ONLY
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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.
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.
CAUTION
Before attempting to perform any service or mainte-
nance, turn the electrical power to unit OFF at dis-
connect switch.
BEFORE LIGHTING smell all around the appliance
area for gas. Be sure to smell next to the floor be-
cause some gas is heavier than air and will settle on
the floor.
WARNING
Do not set thermostat below 60ºF (16ºC) in heating
mode. Setting thermostat below 60º (16ºC) reduces
the number of heating cycles. Damage to the unit
may occur that is not covered by the warranty.
Use only your hand to push in or move the gas control
lever or switch. Never use tools. If the lever or switch
will not push in or move by hand, do not try to repair it,
call a qualified service technician. Force or attempted
repair may result in a fire or explosion.
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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 air flow to unit. Unit must receive
an unobstructed flow of combustion and ventilat-
ing air. Do not obstruct termination ends of ex-
haust and intake pipes.
3- DO NOT store chlorine or fluorine products near unit
or introduce these products into the combustion air.
These products can cause furnace corrosion.