Installation guide

DUCT COVERS REMOVED
Fig. lOB---Vertical Duct Cover Removed
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4. If unit ductwork is to be attached to vertical opening flanges on the unit composite base 0ackstand applications only), do so at this time.
z_ CAUTION: Collect ALL screws that were removed. Do not leave screws on rooftop as permanent damage to the roof may
occur,
5. It is recommensted that the unit base insulation around the perimeter of the vertical return-air opening be secured to the unit base with
aluminum tape. Applicable local codes may require aluminum tape to prevent exposed fiberglass.
6. Cover both horizontal duct openings with the duct covers fi'om the accessory duct cover kit. Ensure opening is air- and watertight.
7. After completing unit conversion, perform all safety checks and power up unit.
NOTE: The design and installation of the duct system must be in accordance with the standards of the NFPA for installation of nonresidenceqype
air conditioning and ventilating systems, NFPA 90A or residence*type, NFPA 90B; and/or local codes and ordinances.
Adhere to the following criteria when selecting, sizing, and installing the duct system:
1. Units are shipped for horizontal duct installation (by removing duct covers).
2. Select and size ductwork, supply*air registers, and return*air grilles according to American Society of Heating, Refrigeration and Air
Constitioning Engineers (ASHRAE) recommendations.
3. Use flexible transition between rigid ductwork and unit to prevent transmission of vibration. The transition may be screwed or bolted to
duct flanges. Use suitable gaskets to ensure weathertight and airtight seal.
4. All units must have field*supplied filters or accessory filter rack installed in the return*air side of the unit. Recommended sizes for filters
are shown in Tables 1 and 2.
5. Size all ductwork for maximum required airflow (either heating or cooling) for unit being installed. Avoid abrupt duct size increases or
decreases or performance may be affected.
6. Adequately insulate and weatherproof all ductwork located outdoors, insulate ducts passing through unconditioned space, and use vapor
barrier in accordance with latest issue of Sheet Metal and Air Conditioning Conlractors National Association (SMACNA) and Air
Conditioning Contractors of America (ACCA) minimum installation standards for heating and air conditioning systems. Secure all ducts
to building structure.
7. Flash, weatherproof, and vibration-isolate all openings in building structure in accordance with local codes and good building practices.
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