Page 8
20248-2-0806
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
Inside Diameter
Tubing, Type L
Outside Diameter
Nat.
L.P.
Nat.
L.P.
0-10 feet
0-3 meters
1/2”
12.7mm
3/8”
9.5mm
1/2”
12.7mm
3/8”
9.5mm
10-40 feet
4-12 meters
1/2”
12.7mm
1/2”
12.7mm
5/8”
15.9mm
1/2”
12.7mm
40-100 feet
13-30 meters
1/2”
12.7mm
1/2”
12.7mm
3/4”
19mm
1/2”
12.7mm
100-150 feet
31-46 meters
3/4”
19mm
1/2”
12.7mm
7/8”
22.2mm
3/4”
19mm
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.
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).
Figure 3
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
VF24FP3-1
Natural gas will have a manifold pressure of approximately
3.5" w.c. (.871kPa) for maximum input or 1.7" w.c. (.423kPa) for minimum
input at the pressure regulator outlet with the inlet pressure to the pressure
regulator from a minimum of 5.0" w.c. (1.120kPa) for the purpose of input
adjustment to a maximum of 10.5" w.c. (2.614kPa).
VF24FP2-1
Natural
gas will have a manifold pressure of approximately 6.0" w.c. (1.49kPa) at
the pressure regulator outlet with the inlet pressure to the pressure regulator
from a minimum of 7.0" w.c. (1.74kPa) for the purpose of input adjustment
to a maximum of 10.5" w.c. (2.615kPa).
VF24FP3-1
Propane gas will have a manifold pressure approximately
10.0"w.c. (2.49kPa) for maximum input or 6.3"w.c. (1.568kPa) for minimum
input at the pressure regulator outlet with the inlet pressure to the pressure
regulator from a minimum of 11.0"w.c. (2.739kPa) for the purpose of input
adjustment to a maximum of 13.0"w.c. (3.237kPa).
VF24FP2-1
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).
GAS SUPPLY
