Installation Manual

9
Figure 4. Rigging & Hoisting
LIFTING
BEAM
CABLE OR CHAIN
SPREADER
BAR
SPREADER
BAR
BASE
RAIL
BASE
RAIL
Top of unit
to be
unobstructed
Recommended Clearances
for Servicibility
Minimum Required
Clearances to Combustibles
36"
36"
36"
36"
48"
48"
60"
48"
Figure5.UnitClearanceRequirements
Figure 7. Concrete Mounting Pad
3” min
Figure6.RoofCurb
Roof
Curb
B, or C roof covering material as long as the following
requirementsaremet:
• Ifusingsidesupplywithreturnairducts,thehorizontal
discharge kit must be installed prior to unit installation.
• Ifusingbottomdischargewithreturnairductsaroofcurb
must be installed prior to unit installation. See Rigging
and Hoisting section on page 8 for setting of the unit.
Rooftop Mounting
Rooftop installations must be located according to local
buildingcodesorordinancesandtheserequirements:
• Theroofmustbecapableofhandlingtheweightofthe
unit. For unit weights, see Table 3 (page 27). Reinforce
the roof if necessary.
• Theappropriateaccessoryroofcurb(Figure6)mustbe
installed prior to unit installation. The roof curb must be
square and level to ensure proper condensate drainage.
Pleasefollowallinstructionsprovidedwiththekit.
WARNING:
Neverdrillorpunchholesinunitbasewhen
installingdownowunits.Leakagemayoccur
ifbottompanispunctured.
• On bottom discharge applications, the supply and
return air ducts must be attached to the roof curb duct
supports, not the unit. Install all ductwork before setting
unit on curb or frame.
• Framesupportmustbeconstructedusingnoncombustible
materials. Full perimeter support is required under the
unit. Supports must be made of steel or weather resistant
wooden materials. The unit must be square and level
to ensure proper condensate drainage.
• Theframemustbehighenoughtoensureprevention
of any moisture from entering the unit. Recommended
height to unit base is 8” (20cm) for both Downflow and
Horizontal installations.
• Secure roof curb or frame to roof using acceptable
mechanical methods per local codes.
Ground Level
Ground level installations must be located according to
localbuildingcodesorordinancesandtheserequirements:
• Clearancesmustbeinaccordancewiththoseshown
in Figure 5.
• Aconcretemountingpad(Figure7)mustbeprovided
and separate from the building foundation. The pad
must be level to ensure proper condensate disposal
and strong enough to support the unit’s weight. The slab
height must be a minimum of 3” (8cm) above grade and
with adequate drainage.
• Units require horizontal supply and return kit for
horizontal installations.
• Ductwork should be attached directly to anges on
panels supplied in horizontal duct conversion kits.