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Installation
Foundation
Horizontal Units
If the unit is installed at ground level, elevate it above the snow line. Provide concrete footings at
each support location with a "full perimeter" support structure or a slab foundation for support.
Refer to
constructing a footing foundation.
If anchoring is required, anchor the unit to the slab using hold down bolts or isolators. Isolators
should be installed to minimize the transmission of vibrations into the building.
For rooftop applications, ensure the roof is strong enough to support the combined unit and
support structural weight.
If anchoring is required, anchor the unit to the roof with hold-down bolts or isolators.
Check with a roofing contractor for proper waterproofing procedures.
Ductwork
Elbows with turning vanes or splitters are recommended to minimize air noise due to turbulence
and to reduce static pressure.
When attaching the ductwork to the unit, provide a water- tight flexible connector at the unit to
prevent operating sounds from transmitting through the ductwork.
All outdoor ductwork between the unit and the structure should be weather proofed after
installation is completed.
Note: For sound consideration, cut only the holes in the roof deck for the ductwork penetrations.
If a Curb Accessory Kit is not used:
General Unit Requirements
The checklist listed below is a summary of the steps required to successfully install a commercial
unit. This checklist is intended to acquaint the installing personnel with what is required in the
installation process. It does not replace the detailed instructions called out in the applicable
sections of this manual.
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22
Table 1, p.
18and
Table 2, p.
Table 1, p. 18
Do not cut out the entire roof deck within the curb perimeter.
a. The ductwork can be attached directly to the factory-provided flanges around the unit's
supply and return air openings. Be sure to use flexible duct connections at the unit.
b. For "built-up" curbs supplied by others, gaskets must be installed around the curb perimeter
flange and the supply and return air opening flanges.
Check the unit for shipping damage and material shortage; file a freight claim and notify
appropriate sales representative.
Verify correct model, options and voltage from nameplate.
Verify that the installation location of the unit will provide the required clearance for proper
operation.
Assemble and install the roof curb (if applicable). Refer to the latest edition of the curb installers
guide that ships with each curb kit.
Fabricate and install ductwork; secure ductwork to curb.
Rigging the unit.
Set the unit onto the curb; check for levelness.
Ensure unit-to-curb seal is tight and without buckles or cracks.
Install and connect a condensate drain line to the evaporator drain connection.
18for the unit's operating and point loading weights when
and
Table 2, p. 18
for the unit operating weights.
RT-SVX25C-EN
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