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GAS PIPING
IMPORTANT NOTE: This unit is factory set to operate on
natural gas at the altitudes shown on the rating plate.
LP Conversion
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. Conversion to
LP gas is permitted with the use of the factory authorized
conversion kit LPM-08.
Refer to the Installation Manual provided with the LP kit for
conversion from natural gas to propane gas.
NOTE: The LPLP03 Propane Low Pressure Switch can be
used in conjunction with the LP conversion kit.
INLET GAS PRESSURE
Natural
Min. 5.0" W.C., Max. 10.0" W.C.
Propane
Min. 11.0" W.C., Max. 13.0" W.C.
Inlet Gas Pressure be within the Minimum and the
Maximum Value Shown in Table Above.
The minimum supply pressure should not vary from that
shown in the table above because this could prevent the
unit from having dependable ignition. In addition, gas input
to the burners must not exceed the rated input shown
on the rating plate. Over firing of the unit could result in
premature heat exchanger failure.
High Altitude Derate (U.S. Installations Only)
IMPORTANT NOTE: Installation of this gas/electric
package unit at altitudes above 2000 ft (610 m) shall
be made in accordance with the Listed High Altitude
Conversion Kit.
Rigging
The gas/electric units naturally derate with altitude. Do
not attempt to increase the firing rate by changing orifices
or increasing the manifold pressure. This can cause poor
combustion and equipment failure. At all altitudes, the
manifold pressure must be within 0.3 inches W.C. of that
listed on the nameplate for the fuel used. At all altitudes
and with either fuel, the air temperature rise must be within
the range listed on the unit nameplate.
Refer to Installation Manual provided with High Altitude kit
for altitude adjustments.
Use HA03 for installations above 2000'.
NOTE: Up to 2,000 feet, no changes are required;
above 2,000 feet, refer to the gas/electric package unit
specification sheets for required kit(s).
Piping
IMPORTANT NOTE: To avoid possible unsatisfactory
operation or equipment damage due to under firing of
equipment, do not undersize the natural/propane gas piping
from the meter/tank to the unit. When sizing a trunk line,
include all appliances on that line that could be operated
simultaneously.
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)
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