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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.
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.
VIEW FROM TOP OF HEATER
1 1
1/16” (43mm)
TO
WALL
3 9/16”
(90mm)
GAS INLET
IN BOTTOM
OF HEATER
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 con
-
nected; 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 Na
-
tional 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 (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 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
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 pres
-
sure 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/LP 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 adjust-
ment 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
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