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WC-IOM-7 • Packaged Heat Pump 21
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 Table 1 on page 19 for the
unit’s operating and point loading weights when 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. Refer to Table 1 on page 19 for the
unit operating weights. 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. Do not cut out the entire roof deck within the curb
perimeter.
If a Curb Accessory Kit is not used:
1. 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.
2. For “built-up” curbs supplied by others, gaskets must be installed around the
curb perimeter flange and the supply and return air opening flanges.
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
Installation