8. Reassemble all parts in reverse order as removed. Be sure to
engage the main burner orifices in the proper opening in the
burners.
9. After reassembling, turn gas on and check all joints for gas
leaks using a soapy solution. All leaks must be repaired im-
mediately.
Gas PipingRequirements
1. Install gas piping in accordance with local codes, or in the ab-
sence of local codes, the applicable national codes.
2. It is recommended that a manual shutoff valve be installed in
the gas supply line outside the unit. Locate valve as close to
the furnace as possible where it is readily accessible. Refer
to Figure 11.
ManuatValve
Bbow end
sh_ nipple
Typical Gas Piping
25-22-31
3. Use black iron or steel pipe and fittings or other pipe ap-
proved by local code.
4. Use pipe thread compound which is resistant to natural and
LP gases.
5. Install a drip leg no less than 3" long to trap dirt and moisture
before it can enter gas valve.
6. Provide a 1/8" inch plug for test gauge connection immedi-
ately up stream of gas supply connection to furnace.
7. Use two pipe wrenches when making connections to prevent
gas valve from turning.
8. Flexible corrugated metal gas connector may NOT be used
inside the furnace or be secured or supported by the furnace
or ductwork.
9. Properly size gas pipe to handle combined appliance load or
run gas pipe directly from gas meter or LP gas regulator.
10. Install correct pipe size for run length and furnace rating.
11. Measure pipe length from gas meter or LP second stage reg-
ulator.
Fire or explosion hazard.
The flexible corrugated metal gas connector must
be properly installed, cannot go through the side
of the furnace, and can not be used inside the
furnace.
Failure to properly install metal gas connector
can result in death, bodily injury and/or property
damage.
Additional LP PipingRequirements
• Have a licensed LP gas dealer make all connections at stor-
age tank and check all connections from tank to furnace.
• If copper tubing is used, it MUST comply with limitation set in
Local Codes, or in the absence of local codes, the gas codes
of the country having jurisdiction.
• Two-stage regulation of LP gas is recommended.
FinalCheck
• Test all pipe for leaks.
• If orifices where changed, make sure they are checked for
leaks.
• During pressure testing of gas piping system, observe the
following:
a. If test pressure does not exceed 1/2" PSIG, isolate the fur-
nace by closing its individual manual shutoff valve.
b. If test pressure exceeds 1/2"PSIG, the furnace and its indi-
vidual shutoff valve must be disconnected from the gas sup-
ply system.
• To check for leaks apply soap suds or a liquid detergent to
each joint. Bubbles forming indicate a leak.
• Do not use an open flame to test for gas leaks. Fire or explo-
sion could occur.
• Correct even the smallest leak at once.
Fire or explosion hazard.
Liquid petroleum (LP) gas is heavier than air and
will settle and remain in low areas and open
depressions.
Thoroughly ventilate area and dissipate gas. Do
NOT use a match or open flame to test for leaks,
or attempt to start up furnace before thoroughly
ventilating area.
An open flame or spark can result in death,
personal injury and/or property damage.
7. ElectricalWiring
PowerSupplyWiring Field wiring connections must be made inside the furnace con-
The furnace MUST be electrically wired and grounded in accor- nection box. A suitable strain relief should be used at the point the
dance with local codes, or in the absence of local codes, the appli- wires exit the furnace casing.
cable national codes.
44t 01230801
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