12
RPB-IOM (06-22) 131782-B
INSTALLATION—CONTINUED
Mounting
⚠ DANGER ⚠
Use a suitable hoist to lift the unit (refer to Weights section). Lifting holes are provided for rigging.
Use spreader bars when lifting to prevent chains or cables from damaging the unit.
⚠ CAUTION ⚠
IMPORTANT: To prevent damage from wind blown rain and capillary action, the top surface of the
curb MUST be sealed using 1/4-inch × 1-1/4-inch sealant tape or two 1/4-inch beads of suitable
sealant.
NOTE: If the system includes an outside air hood, install it after the unit is in place.
1. Apply furnished 1/4-inch × 1-1/4-inch foam sealant tape or two 1/4-inch beads of suitable sealant to top surface
of curb, making good butt joints at corners.
2. Lift unit using suitable hoist and spreader bars and set it on curb or rails. If set on rails, leave ends open underneath
for ventilation.
Duct Connections
• Inlet air: Depending on how the unit was ordered, the blower cabinet can have a variety of outside air and return
air inlets. Check the unit to be aware of the inlet air requirements for your installation.
a. The cabinet end can be open, requiring a field-installed hood (option AS2), or the cabinet end can have a
duct flange.
b. Options AR6 and AR7 have a 30% outside air hood and a one-louver damper.
c. If the unit is ordered with an evaporative cooling module (option AS3, AS4, AS5, or AS8), the module is factory-
installed on the blower cabinet and is the point of entry for outside air.
d. With either a hood or a duct flange, the inlet can have a damper. Dampers are available in a variety of
configurations with a variety of controls (AR options).
e. When ordered, a filter rack with a variety of filter options, is factory-installed in the blower cabinet. Refer to
the replacement parts manual listed in Table 1 for replacement filters.
• Supply air discharge: The system has either a horizontal or vertical discharge air opening with a duct flange.
If the discharge outlet is vertical, the system was ordered with a factory-installed downturn plenum (AQ option).
• Air opening dimensions: Refer to Table 2.
Requirements and Suggestions for Connecting and Installing Ducts
• Type of ductwork: The type of duct installation to be used depends in part on the construction type of the roof—
whether wood or steel bar joist, steel truss, or pre-cast concrete—and the ceiling—whether hung, flush, etc.
• Ductwork material: Rectangular duct should be constructed of galvanized iron—not lighter than No. 26 US gauge
—or aluminum—No. 24 B&S gauge.
• Ductwork structure: All duct sections 24 inches (610 mm) or wider and over 48 inches (1,219 mm) in length
should be cross-broken on top and bottom and should have standing seams or angle-iron braces. Joints should
be S and drive strip or locked.
• Through masonry walls: No warm air duct should come in contact with masonry walls. Insulate around all air
duct through masonry walls with 1-inch (not less than 1/2-inch) of insulation.
• Through unheated space: Insulate all exposed warm air ducts passing through an unheated space with 1-inch
(not less than 1/2-inch) of insulation.
• Duct supports: Suspend all ducts securely from adjacent buildings members. Do not support ducts from unit
duct connections.
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