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CAUTION:
!
All panels must be securely in place
when rigging and hoisting.
Rigging and Hoisting — The unit should be
lifted using slings and spreader bars. The
spreader bars are necessary to prevent
damaging the top of the unit's cabinet. Make
sure that the lifting equipment is adequate for
the load. Refer to Figure 2 for unit weights.
Keep the unit in an upright position at all times.
For rooftop installations, remove and discard
the two supports attached beneath the unit.
The rigging must be located outside the unit's
center of gravity. Refer to Figure 2 for center of
gravity location.
Rooftop — For rooftop installations use the
appropriate accessory roof curb and follow all
instructions included with it. Make sure the two
supports beneath the unit have been removed.
Locate the unit according to local building codes
and ordinances. The curb must be level to insure
proper condensate drainage. (See Figure 6)
The roof must be capable of handling the weight
of the unit. (See Figure 2) for unit weights.
Reinforce the roof if required.
AIR DUCTS
This unit is designed only for use with a supply
and return duct. Air ducts should be installed in
accordance with the standards of the National
Fire Protection Association "Standard for
Installation of Air Conditioning Systems" (NFPA
90A), "Standard for Installation of Residence
Type Warm Air Heating and Air Conditioning
Systems" (NFPA 90B), and all applicable local
codes.
Design the duct work according to methods
described by the National Warm Air Heating and
Air Conditioning Association (ACCA). The ducts
must be properly sized not to exceed .2" w.c.
pressure drop at 400 scfm per nominal ton of
cooling capacity.
Duct work should be attached directly to the unit
flanges for horizontal applications. On roof curb
installations the ducts must be attached to the
curb hangers, not the unit.
Unconditioned Spaces — All duct work passing
through unconditioned space must be properly
insulated to minimize duct losses and prevent
condensation. Use insulation with an
outer vapor barrier. Refer to local codes for
insulation material requirements.
Figure 5. Ground Level Installation
2"
7
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