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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
Recommended Gas Pipe Diameter
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 checked
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
Figure 1
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
L.P.
disconnected from piping at inlet of control valve and pipe capped
3/8"
or plugged for pressure test. Never pressure test with appliance
connected; control valve will sustain damage!
1/2"
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 inlet.
1/2"
This should consist of a vertical length of pipe tee connected into the
gas line that is capped on the bottom in which condensation and foreign
3/4"
particles may collect.
19 mm
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 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.
Checking Manifold Pressure
Both Propane and Natural gas valves have a built-in pressure regulator
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 con-
nection, is located on the outlet side of the gas control.
12822-5-0709
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