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WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow the warning could result in personal injury,
death or property damage.
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
could result causing property damage, personal injury or loss
of life.
GAS
SUPPLY
MANUAL
SHUTOFF
VALVE
(REQUIRED)
SEDIMENT
TRAP
UNION
Fig. 29 - - Typical Gas Pipe Arrangement
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.
A93324
COMBUSTION-AIR PIPE GROMMET
COMBUSTION
-AIR PIPE
GAS LINE
VENT PIPE
GAS LINE GROMMET
VENT PIPE GROMMET
NOTE: PIPE GROMMETS AND ENTRY HOLE FILLER
PLUGS ARE INCLUDED IN FACTORY-SUPPLIED
LOOSE PARTS BAG
Typical Gas Pipe Arrangement
Fig. 30 - -
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. 30.)
NOTE: The gas 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. wc) stated on gas control valve.
(See Fig. 55.)
Piping should be pressure and leak tested in accordance with
NFGC in the United States or NSCNGPIC in Canada, local, and
national plumbing and gas codes before the furnace has been
connected. After all connections have been made, purge lines and
check for leakage at furnace prior to operating furnace.
If pressure exceeds 0.5 psig (14-in. wc), gas supply pipe must be
disconnected from furnace and capped before pressure test. If test
pressure is equal to or less than 0.5 psig (14-in. wc), turn off
electric shutoff switch located on furnace gas control valve and
accessible manual shutoff valve before test. After all connections
have been made, purge lines and check for leakage.
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.
Step 8—Electrical Connections
See Fig. 31 for field wiring diagram showing typical field 115-v
and 24-v wiring. Check all factory and field electrical
connections for tightness.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Blower access door switch opens 115-v power to control. No
component operation can occur. Do not bypass or close switch
with panel removed.
UNUSED 1-3/4 -IN. (44 mm)
DIAMETER GAS
CONN. HOLE
GAS LINE ENTRY
HOLE FILLER PLUG
A05057
- - 27 - -
A05057
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