21
Combustion
Air
Intake
Elbow
Exhaust
Vent
Exhaust
Plumbing Vent Roof Boot
(Typ. Both Pipes)
A
1"
18" Min.
36" Max.
A
Figure 17. Vertical Vent Termination
A= 12” Above Roof or Snow Accumulation
Level
GAS SUPPLY AND PIPING
This furnace is equipped for either left or right
side gas entry. Typical gas service hook-ups
are shown in Figure 19. When making the gas
connection provide clearance between the gas
supply line and the entry hole in the furnace
casing to avoid unwanted noise and/or damage
to the furnace.
All gas piping must be installed in compliance
with local codes and utility regulations. Some
local regulations require the installation of a
manual main shut-off valve and ground joint
union external to the furnace. The shut-off valve
should be readily accessible for service and/or
emergency use. Consult the local utility or gas
supplier for additional requirements regarding
placement of the manual main gas shut-off. In
the absence of local codes the gas line instal-
lation must comply with the latest edition of
8"
Left Side
Drain
"HARD" J
Drain Tube
Clamp
(Loosen For Step 1)
(Retighten for Step 3)
Route to
floor drain.
...OR
Route to
condensate
pump. Keep
downward
slope.
Collector Box
A
Rotate counter
clockwise (Step 2)
Upfl ow Models
the National Fuel Gas Code (ANSI Z223.1) or
(CAN/CGA B149) installation codes.
An 1/8” NPT plugged tap must be installed in the
gas line to the unit for use when measuring the
gas supply pressure. The plug should be readily
accessible for service use. A drip leg should be
installed in the vertical pipe run to the unit. Table 6
lists gas fl ow capacities for standard pipe sizes as
a function of length in typical applications based
on nominal pressure drop in the line.
NOTE: Gas piping must not be run in or through
air ducts, chimneys, gas vents, elevator shafts,
etc.
Compounds used on threaded joints of gas pip-
ing must be resistant to the actions of liquefi ed
petroleum gases.
The main manual gas valve and main power dis-
connect to the furnace must be properly labeled
by the installer in case emergency shutdown is
required.
CAUTION:
Do not use matches, lighters, candles,
or other sources of open fl ame to check
for gas leaks.
Leak Check
After the gas piping to the furnace is complete,
all connections must be tested for gas leaks.
Figure 18. Furnace with Condensate Drain Trap Assembly
