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•
The unit may be installed directly on wood floors or on Class
A, Class B, or Class C roof covering material.
•
To avoid possible personal injury, a safe, flat surface for
service personnel should be provided.
Roof Curb Installations Only:
•
Sufficient structural support must be determined prior to
locating and mounting the curb and package unit.
•
Ductwork must be constructed using industry guidelines. The
duct work must be placed into the roof curb before mounting
the package unit.
•
Curb insulation, cant strips, flashing and general roofing
material are furnished by the contractor.
Roof Curb Installation
RIGGING DETAILS
To prevent property damage, the unit should
remain in an upright position during all rigging
and moving operations. To facilitate lifting and
moving when a crane is used, place the unit in an
adequate cable sling.
IMPORTANT NOTE: If using bottom discharge with roof curb,
ductwork should be attached to the curb prior to installing the
unit. Ductwork dimensions are shown in roof curb installation
instructions.
Refer to the Roof Curb Installation Instructions for proper curb
installation. Curbing must be installed in compliance with the
WARNING
National Roofing Contractors Association Manual.
Lower unit carefully onto roof mounting curb. While rigging unit,
center of gravity will cause condenser end to be lower than supply
air end.
IMPORTANT NOTE: This unit is factory set to operate on natural
gas at the altitudes shown on the rating plate.
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.
INLET GAS PRESSURE
Na tura l
Inlet gas pressure must
be within the minimum and
value shown in the inlet gas pressure table.
The minimum supply pressure should not vary from that shown
in the table 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. Overfiring of the
unit could result in premature heat exchanger failure.
To prevent unreliable operation or equipment
damage, the inlet gas supply pressure must be as
specified on the unit rating plate with all other
household gas fired appliances operating.
Piping
To avoid possible unsatisfactory operation
or equipment damage due to underfiring of
equipment, use the proper size of natural gas
piping needed when running pipe from the meter
to the furnace.
8
Rigging
GAS PIPING
Mi n. 5.0" W.C., Ma x. 10.0" W.C.
CAUTION
WARNING
the maximum
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