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Page 7R-2688
GAS SUPPLY
The gas line can be routed either through the floor or 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.
Check all local codes for requirements, especially for the size and
type of gas supply line required.
Recommended Gas Pipe Diameter
Pipe Length Schedule 40 Pipe Tubing, Type L
(Feet) Inside Diameter Outside Diameter
Nat. L.P. Nat. L.P.
0-10 1/2" 3/8" 1/2" 3/8"
1.3 cm 1.0 cm 1.3 cm 1.0 cm
10-40 1/2" 1/2" 5/8" 1/2"
1.3 cm 1.3 cm 1.6 cm 1.3 cm
40-100 1/2" 1/2" 3/4" 1/2"
1.3 cm 1.3 cm 1.9 cm 1.3 cm
100-150 3/4" 1/2" 7/8" 3/4"
1.9 cm 1.3 cm 2.2 cm 1.9 cm
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.
Figure 1
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 for leaks by the installer. This should be done
with a soap solution watching for bubbles on all exposed connec-
tions, 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 inlet. 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 particles may collect.
Figure 2
Method of Installing a Tee Fitting Sediment Trap (Figure 2)
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.
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 connec-
tion, 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
Natural gas will have a manifold pressure of approximately 3.5"
(.871kPa) w.c. at the pressure regulator outlet with the inlet
pressure to the pressure regulator from a minimum of 4.5" w.c.
(1.120kPa) for the purpose of input adjustment to a maximum of
10.5" w.c. (2.614kPa). Propane gas will have a manifold pressure
approximately 10.0"w.c. (2.49kPa) at the pressure regulator
outlet with the inlet pressure to the pressure regulator from a
minimum of 11.0"w.c. (2.739kPa) for the purpose of input
adjustment to a maximum of 13.0"w.c. (3.237kPa).
A test gage connection is located downstream of the gas appliance
pressure regulator for measuring gas pressure. The connection is
a 1/8 inch 3mm) N.P.T. plugged tapping.