Gas Piping Requirements; Final Check - ICP H9MPT050F12B1 Installation Instructions Manual

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Typical Gas Piping for Downflow
Use elbows and 3" pipe nipple to connect
valve to piping when using left side gas pipe
entry.
LP Low pressure swit 1.
Optional LP conversion.
Drip Leg and Union, Union* should be outside
the cabinet. Manual shut-off valve MUST be up-
stream of dripleg, union, and furnace.
Gas Pipe
(Single Pipe)
*Union may be installed inside the cabinet when necessary because of clearances.
Gas Piping Requirements
2.
3.
Properly size gas pipe to handle combined appliance load
or run gas pipe directly from gas meter or LP gas regulator.
Refer to NFGC and ANSI Z223.1 for proper gas pipe size.
Install correct pipe size for run length and furnace rating.
Measure pipe length from gas meter or LP second stage
regulator.
NOTE: Refer to Figure 24 or Figure 25 for the general layout at
the furnace. The rules listed apply to natural and LP gas pipe
installations.
NOTE: On the Dual Certified or Direct Vent models, install the gas
pipe grommet to the furnace side panel with the gas pipe entry. If
needed, remove the 2" hole plug and relocate to the open hole in
the furnace side pane!.
4.
5.
6.
7.
Use black iron or steel pipe and fittings or other pipe ap-
proved by local code.
Use ground joint unions and install a drip leg no less than 3"
long to trap dirt and moisture before it can enter gas valve.
Use two pipe wrenches when making connections to pre-
vent gas valve from turning.
Install a manual shut-off valve external to furnace casing
and tighten all joints securely.
25-23-39
Additional LP Connection Requirements
1. Have a licensed LP gas dealer make all connections at
storage tank and check all connections from tank to fur-
nace.
2. If copper tubing is used, it MUST comply with limitation set
in National Fuel Gas Code or CGA codes.
3. Two-stage regulation of LP gas is recommended.
Final Check
1. The furnace and its individual shut-off valve must be discon-
nected from the gas supply piping system during any pres-
sure testing of that system at test pressures in excess of
1/2"
PSIG.
The furnace must be isolated from the gas supply piping
system by closing its individual manual shut-off valve dur-
ing any pressure testing of the gas supply piping system at
test pressures equal to or less than 1/2" PSIG.
2. Test all pipes for leaks.
3. Gas pressure MUST NOT exceed t/2" PSIG to gas valve.
Checking gas piping above
1/2"
PSIG requires the furnace
and manual shut-off valve to be disconnected during test-
ing.
4. Apply soap suds (or a liquid detergent) to each joint.
Bubbles forming indicate a leak.
5. Correct even the smallest leak at once.
6.
If orifices were changed, make sure they are checked for
leakage.
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