Installation Instructions

7
The rating plate is stamped with the model number, type of gas and gas
input rating. Make sure the unit is equipped to operate on the type of gas
available. The gas line installation must comply with local codes, or in the
absence of local codes, with the latest edition of the National Fuel Gas
Code NFPA 54/ANSI Z223.1.
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 prior two methods above 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)
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.
GAS PIPING CHECKS
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 operation by closing the main electrical disconnect
switch for the unit.
PROPANE GAS INSTALLATIONS
IMPORTANT NOTE: Propane gas conversion kits must be installed
to convert units to propane gas. Contact the distributor or refer
to the specification sheet for your model for the correct LP
conversion kit(s).
Len
g
th of
Pipe in Feet
1/2 3/4
1
1 1/4 1 1/2
10 132 278 520 1050 1600
20 92 190 350 730 1100
30 73 152 285 590 980
40 63 130 245 500 760
50 56 115 215 440 670
60 50 105 195 400 610
70 46 96 180 370 560
80 43 90 170 350 530
90 40 84 160 320 490
100 38 79 150 305 460
Pressure = .50 PSIG or less and Pressure Drop of 0.3" W.C. (Based
on 0.60 Specific Gravity Gas)
Natural Gas Capacity of Pipe
in Cubic Feet of Gas Per Hour (CFH)
Nominal Black Pipe Size (inches)
BTUH Furnace Input
Heatin
g
Value of Gas
(
BTU/Cubic Foot
)
CFH =
DRIP LEG
MANUAL
SHUT-OFF
VALVE
GROUND JOINT UNION
(INSTALLED AHEAD OF GAS VALVE)
GROMMET
Proper Piping Practice