Installer’s Guide
18-CD21D1-12
TOP VIEW
AUTOMATIC GAS VALVE
WITH MANUAL SHUTOFF
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could re-
sult in serious injury, death or property damage. Never
test for gas leaks with an open flame. Use a commer-
cially available soap solution made specifically for the
detection of leaks to check all connections. A fire or ex-
plosion may result causing property damage, personal
injury, or loss of life.
GAS PIPING
FIRE - EXPLOSION HAZARD
DO NOT RUN FLEXIBLE GAS LINE THROUGH THE
FURNACE CABINET WALL. FAILURE TO FOLLOW THIS
WARNING COULD RESULT IN PROPERTY DAMAGE,
SERIOUS PERSONAL INJURY, OR DEATH.
This unit is shipped standard for left side installation
of gas piping. A piping knockout is also provided in the
right side for an alternate piping arrangement. The
installation of piping shall be in accordance with pip-
ing codes and the regulations of the local gas company.
Pipe joint compound must be resistant to the chemical
reaction with liquefied petroleum gases. Refer to pip-
ing Table 9 for delivery sizes.
NOTE: Refer to local codes and the National
Fuel Gas Code, current edition, for gas pipe re-
quirements.
The furnace and its individual shut-off valve must be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psig.
The furnace must be isolated from the gas supply pip-
ing by closing its individual manual shut-off valve dur-
ing any pressure testing of the gas supply piping sys-
tem at test pressures equal to or less than 1/2 psig.
Use a backup wrench on the gas valve when install-
ing gas piping to prevent damage to the gas valve and
manifold assembly.NOTE:
Maximum pressure to the gas valve for natural gas is
13.8" W.C. Minimum pressure is 5.0" W.C. Maximum
pressure to the gas valve for propane is 13.8" W.C.
Minimum pressure is 11.0" W.C.
All gas fittings must be checked for leaks using a soapy
solution before lighting the furnace.
DO NOT CHECK WITH AN OPEN FLAME!
The following warning complies with State of California law, Proposition 65.
Hazardous Gases!
Exposure to fuel substances or by-products of
incomplete fuel combustion is believed by the state of
California to cause cancer, birth defects, or other
reproductive harm.
▲
WARNING
!
SEQUENCE OF OPERATION
THERMOSTAT CALL FOR HEAT
R and W thermostat contacts close signaling the con-
trol module to run its self-check routine. After the
control module has verified that the pressure switch
contacts are open and the limit switch(es) contacts are
closed, the draft blower will be energized.
TO PREVENT AN EXPLOSION OR POSSIBLE INJURY,
DEATH AND EQUIPMENT DAMAGE, DO NOT STORE
COMBUSTIBLE MATERIALS, GASOLINE OR OTHER
FLAMMABLE VAPORS OR LIQUIDS NEAR THE UNIT.
LEFT SIDE PIPING (STANDARD)
TOP VIEW OF RIGHT SIDE PIPING
RIGHT SIDE PIPING (OPTIONAL)
f
IMPORTANT:
A sediment trap must be installed in the gas line
before the furnace gas valve. The sediment trap
must be located as close to the furnace cabinet
as practical.
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