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GAS SUPPLY
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.
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"
12.7mm 9.5mm 12.7mm 9.5mm
10-40 1/2" 1/2" 5/8" 1/2"
12.7mm 12.7mm 15.9mm 12.7mm
40-100 1/2" 1/2" 3/4" 1/2"
12.7mm 12.7mm 19mm 12.7mm
100-150 3/4" 1/2" 7/8" 3/4"
19mm 12.7mm 22.2mm 19mm
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 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.
Method of Installing a Tee Fitting Sediment Trap
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 appliance main gas 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 equipment 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
VFCR-25 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 4.5" w.c.
(1.120kPa) for the purpose of input adjustment to a maximum of
10.5" w.c. (2.614kPa). VFC
M-25 and VFCT-25 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). VFCR-25
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).
VFCM-25 and VFCT-25 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).
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 3mm) N.P.T. plugged tapping.
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