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Locating Gas Supply
The gas line can enter the unit either through the floor or outside
wall. The gas line opening should be made at this time. Location
of the opening will be determined by the position of floor joists and
the valve and union used for servicing.
Recommended Gas Pipe Diameter
Schedule 40 Pipe
Inside Diameter
Pipe Length
Nat.
0-10 feet
1/2"
0-3 meters
12.7 mm
10-40 feet
1/2"
4-12 meters
12.7 mm
40-100 feet
1/2"
13-30 meters
12.7 mm
100-150 feet
3/4"
31-46 meters
19 mm
Note: Never use plastic pipe. Check to confirm whether your local
codes allow copper tubing or galvanized.
Note: Since some municipalities have additional local codes, it is
always best to consult your local authority and installation code.
The use of the following gas connectors is recommended:
— ANS Z21.24 Appliance Connectors of Corrugated Metal Tubing
and Fittings
— ANS Z21.45 Assembled Flexible Appliance Connectors of Other
Than All-Metal Construction
The above connectors may be used if acceptable by the authority
having jurisdiction. The state of Massachusetts requires that a
flexible appliance connector cannot exceed three feet in length.
Consult the current National Fuel Gas Code, ANSI Z223.1 CAN/
CGA-B149 (.1 or .2) installation code.
Installing a New Main Gas Cock
Each appliance should have its own manual gas cock.
A manual main gas cock should be located in the vicinity of the unit.
Where none exists, or where its size or location is not adequate,
contact your local authorized installer for installation or relocation.
Compounds used on threaded joints of gas piping shall be resistant
to the action of liquefied petroleum gases. The gas lines must be
32188-4-0814
GAS SUPPLY
Tubing, Type L
Outside Diameter
L.P.
Nat.
3/8"
1/2"
9.5mm
12.7 mm
9.5 mm
1/2"
5/8"
12.7mm
15.9 mm
12.7 mm
1/2"
3/4"
12.7mm
19 mm
12.7 mm
1/2"
7/8"
12.7 mm
22.2 mm
19 mm
NPT NIPPLE
Figure 1
checked for leaks by the installer. This should be done with a soap
solution watching for bubbles on all exposed connections, and if
unexposed, a pressure test should be made.
Never use an exposed flame to check for leaks. Appliance must
be disconnected from piping at inlet of control valve and pipe
capped or plugged for pressure test. Never pressure test with
appliance connected; control valve will sustain damage!
A gas valve and ground joint union should be installed in the gas
line upstream of the gas control to aid in servicing. It is required by
the National Fuel Gas Code that a drip line be installed near the gas
L.P.
inlet. This should consist of a vertical length of pipe tee connected
3/8"
into the gas line that is capped on the bottom in which condensation
and foreign particles may collect.
1/2"
1/2"
3/4"
Method of Installing a Tee Fitting Sediment Trap
Pressure Testing of the Gas Supply System
1. To check the inlet pressure to the gas valve, a 1/8" (3mm) N.P.T.
plugged tapping, accessible for test gauge connection, must be
placed immediately upstream of the gas supply connection to
the appliance.
2. The appliance and its individual shutoff valve must be
disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess of
1/2 psig (3.5 kPa).
3. The appliance must be isolated from the gas supply piping system
by closing its individual manual shutoff valve during any pressure
testing of the gas supply piping system at test pressures equal
to or less than 1/2 psig (3.5 kPa).
Attention! If one of the above procedures results in pressures in
excess of 1/2 psig (14" w.c.) (3.5 kPa) on the appliance gas valve,
it will result in a hazardous condition.
Figure 2
Figure 3
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