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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
– A NS Z21.45 A ssembled Flexible A ppliance Connectors of Other
Than All-Metal Construction
The above connectors may be used if acceptable by the author-
ity 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.
Page 6
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
Figure 1
Compounds used on threaded joints of gas piping shall be resistant
to the action of liquefied petroleum gases. The gas lines must be
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.
L.P.
Never use an exposed flame to check for leaks. Appliance must
3/8"
be disconnected from piping at inlet of control valve and pipe
capped or plugged for pressure test. Never pressure test with
1/2"
appliance connected; control valve will sustain damage!
A gas valve and ground joint union should be installed in the gas
1/2"
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
inlet. This should consist of a vertical length of pipe tee connected
3/4"
into the gas line that is capped on the bottom in which condensation
and foreign particles may collect.
Figure 2 - 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 discon-
nected 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.
Checking Manifold Pressure
Both Propane and Natural gas valves have a built-in pressure regula-
tor in the gas valve. Natural gas models will have a manifold pressure
of approximately 4.0" w.c. (.996kPa) at the valve outlet with the inlet
pressure to the valve from a minimum of 5.0" w.c. (1.245kPa) for the
purpose of input adjustment to a maximum of 10.5" w.c. (2.61kPa).
Propane gas models will have a manifold pressure approximately
10.0" w.c. (2.49kPa) at the valve outlet with the inlet pressure to the
valve from a minimum of 11.0" w.c. (2.739kPa) for the purpose of
input adjustment to a maximum of 13.0" w.c. (3.23kPa).
A 1/8" (3mm) N.P.T. plugged tapping, accessible for test gauge
connection, is located on the outlet side of the gas control.
31910-4-0115
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