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HEAT
EXCHANGER
INTAKE
CONNECTION
EXHAUST
CONNECTION
CONTROL
BOX
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
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 serviceor 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 onlyyour handtopush inor movethegas control
lever or switch. Never use tools. If the lever or switch
will notpushin ormove byhand, donot tryto repairit,
calla qualifiedservice technician.Force orattempted
repair may result in a fire or explosion.
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 keptfree ofinsulating material.Insulatingmaterial
may be combustible.
2- DONOTobstructairflowtounit.Unitmustreceive
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.