18-CD29D1-11 31
Installer’s Guide
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!
Use a backup wrench on the gas valve when installing gas
piping to prevent damage to the gas valve and manifold
assembly.
UPFLOW – LEFT HAND GAS PIPING
UPFLOW – RIGHT HAND GAS PIPING
W
AUTOMATIC GAS VALVE
WITH MANUAL SHUTOFF
MAIN MANUAL
SHUTOFF VALVE
GROUND
UNION
JOINT
DRIP
LEG
AUTOMATIC GAS VALVE
WITH MANUAL SHUTOFF
MAIN MANUAL
SHUTOFF VALVE
GROUND
UNION
JOINT
DRIP
LEG
GAS PIPING
The upow/ horizontal furnace is shipped standard for left
side installation of gas piping. A knock-out is provided on
the right side for an alternate gas piping arrangement. See
Figure 52.
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 piping Table 15, for delivery sizes. Connect gas
supply to the unit, using a ground joint union and a manual
shut-off valve as shown in Figures 52-53.
National codes require a condensation drip leg to be in-
stalled ahead of the controls as shown in Figures 52-53.
The furnace and its individual shut-off valve must be dis-
connected from the gas supply piping system during any
pressure testing of that system at test pressures in excess
of 1/2 psig (3.5 kPa).
The furnace must be isolated from the gas supply piping
by closing its individual manual shut-off valve during any
pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 psig (3.5 kPa).
THE DOWNFLOW (VERTICAL) MAY BE INSTALLED LEFT OR RIGHT SIDE GAS PIPING
E
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