24214-2-1008
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Check all local codes for requirements, especially for the size and
type of gas supply line required.
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.
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 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 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.
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.
Recommended Gas Pipe Diameter
Pipe Length
Schedule 40 Pipe
Inside Diameter
Tubing, Type L
Outside Diameter
Nat.
L.P.
Nat.
L.P.
0-10 feet
0-3 meters
1/2”
12.7 mm
3/8”
9.5 mm
1/2”
12.7 mm
3/8”
9.5 mm
10-40 feet
4-12 meters
1/2”
12.7 mm
1/2”
12.7 mm
5/8”
15.9 mm
1/2”
12.7 mm
40-100 feet
13-30 meters
1/2”
12.7 mm
1/2”
12.7 mm
3/4”
19 mm
1/2”
12.7 mm
100-150 feet
31-46 meters
3/4”
19 mm
1/2”
12.7 mm
7/8”
22.2 mm
3/4”
19 mm
GAS SUPPLY
Figure 1
Pressure Testing of the Gas Supply System
1. To check the inlet pressure to the gas valve, a 1/8" (3 mm) 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
Natural gas will have a manifold pressure of approximately
3.5" w.c. (.871 kPa) for maximum input or 1.7" w.c. (.423 kPa) for
minimum input at the pressure regulator outlet with the inlet pressure
to the pressure regulator from a minimum of 4.5" w.c. (1.245 kPa)
for the purpose of input adjustment to a maximum of 10.5" w.c.
(2.614 kPa). Propane gas will have a manifold pressure approximately
10.0" w.c. (2.49 kPa) for maximum input or 6.3" w.c. (1.568 kPa)
for minimum input at the pressure regulator outlet with the inlet
pressure to the pressure regulator from a minimum of 11.0" w.c.
(2.739 kPa) for the purpose of input adjustment to a maximum of
13.0" w.c. (3.237 kPa).
NOTE:
The gas control is equipped with a captured screw type
pressure test point, therefore it is not necessary to provide a 1/8"
test point up stream of the control.
A test gauge connection is located downstream of the gas appliance
pressure regulator for measuring gas pressure. The connection is a
1/8 inch (3 mm) N.P.T. plugged tapping.
