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Natural Gas Connection
Refer to the Proper Piping Practice drawing for the general layout at
the unit. The following rules apply:
1. Use black iron pipe and fittings for the supply piping. The use
of a flex connector and/or copper piping is permitted as long
as it is in agreement with local codes.
2. Use pipe joint compound on male threads only. Pipe joint
compound must be resistant to the action of the fuel used.
3. Use ground joint unions.
4. Install a drip leg to trap dirt and moisture before it can enter
the gas valve. The drip leg must be a minimum of three inches
long.
5. Use two pipe wrenches when making connection to the gas
valve to keep it from turning.
6. Install a manual shut-off valve in a convenient location (within
six feet of unit) between the meter and the unit.
7. Tighten all joints securely.
8.
The unit must be connected to the building piping by one of
the following methods:
• Rigid metallic pipe and fittings
• Semirigid metallic tubing and metallic fittings (Aluminum alloy tubing must not be used in exterior locations)
• Listed gas appliance connectors used in accordance with the terms of their listing that are completely in the same room
as the equipment
• In the preceding two methods the connector or tubing must be protected from physical and thermal damage. Aluminum
alloy tubing and connectors must be coated to protect against external corrosion when in contact with masonry,
plaster or insulation or are subject to repeated wettings by liquids (water - not rain water, detergents or sewage).
Proper Piping Practice
NOTE: The unit gas supply entrance is factory sealed with plugs.
Keep plugs in place until gas supply is ready to be installed.
Once ready, replace the plugs with the supplied grommets and
install gas supply line.
There will be air in the gas supply line after testing for leaks on
a new installation. Therefore, the air must be bled from the line
by loosening the ground joint union until pure gas is expelled.
Tighten union and wait for five minutes until all gas has been
dissipated in the air. Be certain there is no open flame in the
vicinity during air bleeding procedure. The unit is placed in op-
eration by closing the main electrical disconnect switch for the
unit.
Natural Gas Capacity of Pipe
in Cubic Feet of Gas Per Hour (CFH)
Length of
Pipe in Feet
1/2
10
132
20
92
30
73
40
63
50
56
60
50
70
46
80
43
90
40
100
38
Pressure = .50 PSIG or less and Pressure Drop of 0.3" W.C. (Based
on 0.60 Specific Gravity Gas)
CF H =
H eating V alu e of G as (B T U/C ubic Fo ot)
GROMMET
Piping
9
Nominal Black Pipe Size (inches)
1
3/4
1 1/4
278
520
1050
190
350
730
152
285
590
130
245
500
115
215
440
105
195
400
96
180
370
90
170
350
84
160
320
79
150
305
B TU H F urn ace Inp ut
GROUND JOINT UNION
(INSTALLED AHEAD OF GAS VALVE)
1 1/2
1600
1100
980
760
670
610
560
530
490
460
MANUAL
SHUT-OFF
VALVE
DRIP LEG
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