035-19315-001-A-0603
Unitary Products Group
11
If a unit is to be installed on a roof curb or special frame
other than a UPG roof curb, gasketing must be applied
to all surfaces that come in contact with the unit under-
side.
RIGGING AND HANDLING
Exercise care when moving the unit. Do not remove
any packaging until the unit is near the place of installa-
tion. Rig the unit by attaching chain or cable slings to
the lifting holes provided in the base rails. Spreader
bars, whose length exceeds the largest dimension
across the unit, MUST BE USED.
Units may also be moved or lifted with a forklift. Slotted
openings in the base rails are provided for this pur-
pose. Fork lengths must be a minimum of 42 inches.
Remove the nesting brackets from the four corners on
the top of the unit. All screws that are removed when
removing the brackets must be replaced on the unit.
Refer to Table 8 for unit weights and to the Figure 6 for
approximate center of gravity.
CLEARANCES
All units require certain clearances for proper operation
and service. Installer must make provisions for ade-
quate ventilation air. Refer to Dimensions and Clear-
ances shown in Figures 7 through 10 and Table 20 for
the clearances required for combustible construction,
servicing, and proper unit operation.
DUCTWORK
Ductwork should be designed and sized according to
the methods in Manual Q of the Air Conditioning Con-
tractors of America (ACCA).
A closed return duct system shall be used. This shall
not preclude use of economizers or outdoor fresh air
intake. The supply and return air duct connections at
the unit should be made with flexible joints to minimize
noise.
The supply and return air duct systems should be
designed for the CFM and static requirements of the
job. They should NOT be sized to match the dimen-
sions of the duct connections on the unit.
Refer to Figures 7 and 10 for information concerning
side and bottom supply and return air duct openings.
CONDENSATE DRAIN
Plumbing must conform to local codes. Use a sealing
compound on male pipe threads. Install a condensate
drain line from the one-inch NPT female connection on
the unit to an open drain.
NOTE:
The condensate drain operates in a negative
pressure in the cabinet. The condensate drain
line MUST be trapped to provide proper drain-
age. See Figure 1.
Before lifting a unit, make sure that all panels
are in place and that its weight is distributed
equally on all cables so it will lift evenly.
Do not permit overhanging structures or shrubs
to obstruct outdoor air discharge outlet, com-
bustion air inlet or vent outlets.
When fastening ductwork to side duct flanges
on unit, insert screws through duct flanges
only. DO NOT insert screws through casing.
Outdoor ductwork must be insulated and
waterproofed.
FIGURE 1 - RECOMMENDED DRAIN PIPING
