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GAS SUPPLY
Locating Gas Supply
The gas line can enter the unit either through the floor or outside
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.
Recommended Gas Pipe Diameter
Pipe Length
(Feet)
Schedule 40 Pipe
Inside Diameter
Tubing, Type L
Outside Diameter
Nat.
L.P.
Nat
L.P.
0-10
1/2”
1.3 cm
3/8”
1.0 cm
1/2”
1.3 cm
3/8”
1.0 cm
10-40
1/2”
1.3 cm
1/2”
1.3 cm
5/8”
1.6 cm
1/2”
1.3 cm
40-100
1/2”
1.3cm
1/2”
1.3 cm
3/4”
1.9 cm
1/2”
1.3 cm
100-150
3/4”
1.9cm
1/2”
1.3 cm
7/8”
2.2 cm
3/4”
1.9 cm
Note:
Never Use plastic pipe. Check to confirm whether your lo-
cal 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 Tub-
ing 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 author-
ity having jurisdiction. The state of Massachusetts requires that a
flexible appliance connector cannot exceed three feet in length.
FLEXIBLE GAS LINE CONNECTION
GAS SUPPLY
TEE HANDLE
FLEX TUBING
NPT NIPPLE
FLARE SHUT OFF VALVE
FLARE FITTING
RIGID GAS LINE CONNECTION
CLOSE NIPPLE
TEE HANDLE
NPT NIPPLE
NPT UNION
SHUT OFF VALVE
NPT GAS SUPPLY
Figure 1
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 ad-
equate, contact your local authorized installer for installation or
relocation.
Compounds used on threaded joints of gas piping shall be resis-
tant 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 and 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.
GAS SUPPLY PIPING
1/8 NPT PLUGGED HOLE
FOR TEST GAGE
GROUND JOINT UNION
3” MINIMUM
MANUAL SHUT-OFF VALVE
GAS SUPPLY
INLET
1/8 NPT PLUGGED HOLE
FOR TEST GAGE
GAS
VALVE
Pressure Testing of the Gas Supply System
1. To check the inlet pressure to the gas valve, a 1/8” 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 discon-
nected 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.
Figure 2
Method of Installing a Tee Fitting Sediment Trap
