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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.
Gas Supply
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
Natural
Propane
Natural
Propane
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
NOTICE:
Never use plastic pipe. Check to confirm whether your
local codes allow copper tubing or galvanized.
NOTICE:
Since some municipalities have additional local codes, it
is always best to consult your local authority and installation code.
3 9/16
VIEW FROM TOP OF HEATER
WALL
TO WALL
1 11/16
GAS INLET IN BOTTOM
OF HEATER
Figure 1
Installing a New Main Gas Shut-off
each appliance should have its own manual gas shut-off.
A manual main gas shut-off 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.
Figure 2
Method of Installing a Tee Fitting Sediment Trap -
See
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. The Commonwealth 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 sys-
tem 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
natural Gas will have a manifold pressure of approximately 3.5"
w.c. (.87kPa) at the pressure regulator outlet with the inlet pressure
to the pressure regulator from a minimum of 5.0" w.c. (1.245kPa)
for the purpose of input adjustment to a maximum of 10.5" w.c.
(2.615kPa). Propane Gas will have a manifold pressure approxi
-
mately 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.
GAS SUPPLY
