American Standard Condensing Gas Furnaces Fan Assisted Combustion System Upflow Horizontal and Downflow Horizontal User's Information Manual page 6

WARNING:
Unit is equipped with a blower door switch which cuts power to
blower and gas valve causing shutdown when door is removed.
Unit must not be altered to allow operation with the blower door
removed. Operation with doors removed or ajar can permit the
escape of dangerous fumes. All panels must be securely closed at
all times for safe operation of the furnace.
WARNING:
Should overheating occur, or the gas supply fail to shut off, shut
off the manual gas valve to the furnace before shutting off the
electrical supply.
In the event that electrical, fuel or mechanical failures occur, the
owner should immediately turn off the gas supply at the manual
gas valve located in the burner compartment and electrical
power to the furnace and contact servicer.
For your safety.
Furnace area must be kept clear and free of combustible mate-
rials, gasoline, and other flammable vapors and liquids.
Air for combustion and ventilation.
The flow of combustion and ventilating air must not be ob-
structed from reaching the furnace. Air openings provided in the
casing of furnace must be kept free of obstructions which would
restrict airflow, thereby affecting efficiency and safe operation of
your furnace.
Also, air openings provided to the area in which the furnace is
installed and the space around the furnace shall not be blocked
or obstructed. Keep this in mind should you choose to remodel
the area which contains your furnace. Furnaces must have air for
proper performance.
If additional insulation is added after the furnace is installed,
the area around the furnace must be inspected to ensure it is free
and clear of insulation. If this furnace is installed in an attic or
other insulated space it must be kept free and clear of all
insulating materials as some insulating materials are combus-
tible.
MANUAL MAIN
SHUTOFF VALVE
GROUND
UNION JOINT
Manual Main Gas Shut-off Valve May Be Located on the Top or Bottom Side
Page 6
AUTOMATIC GAS
DRIP LEG
VALVE WITH MANUAL
SHUTOFF
MANUAL MAIN
SHUTOFF VALVE
GROUND
UNION JOINT
DRIP LEG
AUTOMATIC GAS VALVE
WITH MANUAL SHUTOFF
Manual Main Gas Shut-off Valve May Be
Located on the Left or Right Side
MANUAL MAIN GROUND
SHUTOFF VALVE UNION JOINT
AUTOMATIC GAS
VALVE WITH MANUAL
SHUTOFF
MANUAL MAIN
SHUTOFF VALVE
GROUND
UNION JOINT
DRIP LEG
AUTOMATIC GAS VALVE
WITH MANUAL SHUTOFF
DRIP
LEG
Pub. No. 32-5022-10