INSTALLATION INSTRUCTIONS Gas Furnace: WFAR
30 440 01 7104 02
Specifications subject to change without notice.
GAS PIPING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in
personal injury, death, and/or property damage.
Never purge a gas line into a combustion chamber.
Never test for gas leaks with an open flame. Use a
commercially available soap solution made
specifically for the detection of leaks to check all
connections. A fire or explosion may result causing
property damage, personal injury or loss of life.
!
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Use proper length of pipe to avoid stress on gas
control manifold and gas valve.
!
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Gas valve inlet and/or inlet pipe must remain capped
until gas supply line is permanently installed to
protect the valve from moisture and debris. Also,
install a sediment trap in the gas supply piping at the
inlet to the gas valve.
!
WARNING
Gas piping must be installed in accordance with national and
local codes. Refer to current edition of NFGC in the U.S.A.
Refer to current edition of NSCNGPIC in Canada.
Installations must be made in accordance with all authorities
having jurisdiction. If possible, the gas supply line should be a
separate line running directly from meter to furnace.
NOTE: Use a back--up wrench on the inlet of the gas valve
when connecting the gas line to the gas valve.
NOTICE
In the state of Massachusetts:
1. Gas supply connections MUST be performed by a li-
censed plumber or gas fitter.
2. When flexible connectors are used, the maximum
length shall not exceed 36--in. (915 mm).
3. When lever handle type manual equipment shutoff
valves are used, they shall be T--handle valves.
4. The use of copper tubing for gas piping is NOT ap-
proved by the state of Massachusetts.
Refer to Table 9 for recommended gas pipe sizing. Risers must
be used to connect to furnace and to meter. Support all gas
piping with appropriate straps, hangers, etc. Use a minimum of
one hanger every 6 ft. (1.8 M). Joint compound (pipe dope)
should be applied sparingly and only to male threads of joints.
Pipe dope must be resistant to the action of propane gas.
FIRE OR EXPLOSION HAZARD
A failure to follow this warning could result in
personal injury, death, and/or property damage.
If local codes allow the use of a flexible gas
appliance connector, always use a new listed
connector. Do not use a connector which has
previously served another gas appliance. Black iron
pipe shall be installed at the furnace gas control
valve and extend a minimum of 2--in. (51 mm)
outside the furnace.
!
WARNING
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in furnace
damage.
Connect gas pipe to furnace using a backup wrench
to avoid damaging gas controls and burner
misalignment.
CAUTION
!
An accessible manual equipment shutoff valve MUST be
installed external to furnace casing and within 6 ft. (1.8 M) of
furnace.
Install a sediment trap in riser leading to furnace as shown in
Figure 33. Connect a capped nipple into lower end of tee.
Capped nipple should extend below level of furnace gas
controls. Place a ground joint union between furnace gas
control valve and exterior manual equipment gas shutoff valve.
A 1/8--in. (3 mm) NPT plugged tapping, accessible for test
gauge connection, MUST be installed immediately upstream of
gas supply connection to furnace and downstream of manual
equipment shutoff valve.
Piping should be pressure and leak tested in accordance with
the current addition of the NFGC in the United States, local,
and national plumbing and gas codes before the furnace has
been connected. Refer to current edition of NSCNGPIC in
Canada. After all connections have been made, purge lines
and check for leakage at furnace prior to operating furnace.
NOTE: The furnace gas control valve inlet pressure tap
connection is suitable to use as test gauge connection
providing test pressure DOES NOT exceed maximum 0.5 psig
(14--in. w.c.) stated on gas control valve. (See Figure 31.)
If pressure exceeds 0.5 psig (14--in. w.c.), gas supply pipe must
be disconnected from furnace and capped before and during
supply pipe pressure test. If test pressure is equal to or less
than 0.5 psig (14--in. w.c.), turn off electric shutoff switch
located on furnace gas control valve and accessible manual
equipment shutoff valve before and during supply pipe
pressure test. After all connections have been made, purge
lines and check for leakage at furnace prior to operating
furnace.
The gas supply pressure shall be within the maximum and
minimum inlet supply pressures marked on the rating plate with
the furnace burners ON and OFF.
Some installations require gas entry on right side of furnace (as
viewed in upflow). (See Figure 32.)
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