8
Figure 6. Roof Top Installation
WARNING:
To avoid the risk of property damage
or personal injury; it is the rigger’s
responsibility to insure that whatever
means are used to hoist the unit are
safe and adequate.
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
fl anges 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
