8
ROOF CURB I NSTALLATIONS O NLY:
• 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
WARNING
T
O PREVENT PROPERTY DAMAGE, THE UNIT SHOULD REMAIN IN AN UPRIGHT
POSITION DURING ALL RIGGING AND MOVING OPERATIONS.
T
O FACILITATE
LIFTING AND MOVING WHEN A CRANE IS USED, PLACE THE UNIT IN AN
ADEQUATE CABLE SLING.
Important: 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 in-
stallation. Curbing must be installed in compliance with the 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.
Rigging
GAS PIPING
IMPORTANT NOTE: This unit is factory set to operate on natural
gas at the altitudes shown on the rating plate.
WARNING
T
O AVOID PROPERTY DAMAGE, PERSONAL INJURY OR DEATH WHEN EITHER
USING PROPANE GAS ALONE OR AT HIGHER ALTITUDES, OBTAIN AND INSTALL
THE PROPER CONVERSION KIT(S).
F
AILURE TO DO SO CAN RESULT IN
UNSATISFACTORY OPERATION AND/OR EQUIPMENT DAMAGE.
H
IGH ALTITUDE
KITS ARE FOR
U
.
S
. INSTALLATIONS ONLY AND ARE NOT APPROVED FOR USE
IN
C
ANADA.
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-07, for use
with single stage models, or LPM-08, for use with two-stage mod-
els. See table below.
LP Conversion Kit Model
LPM-07 Single Stage Heating Models
LPM-08 Two-Stage Heating Models
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 Must Not Exceed 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. Overfiring of the
unit could result in premature heat exchanger failure.
HIGH ALTITUDE D ERATE (U.S. INSTALLATIONS ONLY)
IMPORTANT NOTE: The gas/electric units naturally derate with al-
titude. Do not attempt to increase the firing rate by changing ori-
fices 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 name-
plate for the fuel used. At all altitudes and with either fuel, the air
temperature rise must be within the range listed on the unit name-
plate.
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