15
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in fire, explosion,
personal injury, or death.
-- Connect gas pipe to furnace using a backup wrench to
avoid damaging gas controls.
-- Gas valve shutoff switch MUST be facing forward or
tilted upward.
-- 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.
-- Use proper length of pipe to avoid stress on gas
control manifold.
-- If a flexible connector is required or allowed by
authority having jurisdiction, black iron pipe shall be
installed at furnace gas valve and extend a minimum
of 2 in. (51 mm) outside furnace casing.
--Protect gas valve from water and debris. Gas valve
inlet and/or inlet piping 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
Install a sediment trap in riser leading to furnace. Trap can be
installed by connecting a tee to riser leading to furnace so
straight--through section of tee is vertical. Then connect a capped
nipple into lower end of tee. Capped nipple should extend below
level of gas controls. Place a ground joint union between gas
control manifold and manual gas shutoff valve. (See Fig. 17.)
An accessible manual shutoff valve MUST be installed external to
furnace casing and within 6 ft. (1.8 M) of furnace. 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 shutoff valve.
Gas line grommet (factory--supplied loose parts bag) should be
used when installing gas piping. Gas line entry hole filler plug
should be installed in unused gas line entry hole. (See Fig. 18.)
BOTTOM
CLOSURE
PANEL
FRONT FILLER
PANEL
A93047
Fig. 16 -- Removing Bottom Closure Panel
UNION
SEDIMENT
TRAP
MANUAL
SHUTOFF
VALVE
(REQUIRED)
GAS
SUPPLY
A93324
Fig. 17 -- Typical Gas Pipe Arrangement
COMBUSTION-AIR PIPE GROMMET
GAS LINE GROMMET
GAS LINE
COMBUSTION
-AIR PIPE
VENT PIPE
VENT PIPE GROMMET
UNUSED 1-3/4 -IN. (44 mm)
DIAMETER GAS
CONN. HOLE
GAS LINE ENTRY
HOLE FILLER PLUG
NOTE: PIPE GROMMETS AND ENTRY HOLE FILLER
PLUGS ARE INCLUDED IN FACTORY-SUPPLIED
LOOSE PARTS BAG
A05057
Fig. 18 -- Casing Pipe Grommets
355B
A
V
