8. Reassembleallpartsinreverseorderasremoved.Besureto
engagethemainburnerorificesintheproperopeninginthe
burners.
9. Afterreassembling,turngasonandcheckalljointsforgas
leaksusingasoapysolution.Allleaksmustberepairedim-
mediately.
Gas Piping Requirements
1. Install gas piping in accordance with local codes, or in the ab-
sence of local codes, the applicable national codes.
2.
3.
4.
5.
6.
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 12.
Use black iron or steel pipe and fittings or other pipe ap-
proved by local code.
Use pipe thread compound which is resistant to natural and
LP gases.
Install a drip leg no less than 3" long to trap dirt and moisture
before it can enter gas valve.
Provide a 1/8" inch plug for test gauge connection immediate-
ly up stream of gas supply connection to furnace.
Typical Gas Piping
Manual
V_lve
Elbow and
short nipple
Union _
and pipe cap / _
L_deen_ / _._
Gas
Valve
Manuel
Valve
25-21-43c
7.
8.
Use two pipe wrenches when making connections to prevent
gas valve from turning.
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.
_] 441 012603 02
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