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RECEIVING AND INSTALLATION
STEP 1 — Check Equipment
Identify Unit
The unit model number and serial number are stamped on the unit
information plate. Check this information against shipping papers.
Inspect Shipment
Inspect for shipping damage before removing packaging materials.
If unit appears to be damaged or is torn loose from its anchorage,
have it examined by transportation inspectors before removal.
Forward claim papers directly to transportation company.
Manufacturer is not responsible for any damage incurred in transit.
Check all items against shipping list. Immediately notify the nearest
equipment distribution office if any item is missing. To prevent loss
or damage, leave all parts in original packages until installation.
STEP 2 — Provide Unit Support
IMPORTANT: The unit must be secured to the curb by installing
screws through the bottom of the curb flange and into the unit base
rails. When installing large base units onto the common curb, the
screws must be installed before allowing the full weight of the unit
to rest on the curb. A minimum of six screws are required for large
base units. Failure to secure unit properly could result in an
unstable unit. See Warning near Rigging/Lifting information and
accessory curb instructions for more details.
For hurricane tie downs, contact distributor for details and PE
(Professional Engineering) Certificate if required.
IMPORTANT: The gasketing of the unit to the roof curb is critical
for a water tight seal. Install gasketing material supplied with the
roof curb. Improperly applied gasketing also can result in air
leaks and poor unit performance.
Curb should be level to within 1/4 in. (6 mm). This is necessary
for unit drain to function properly. Refer to accessory roof curb
installation instructions for additional information as required.
Roof Curb
Install accessory roof curb in accordance with instructions shipped
with curb. See Fig. 5. Install insulation, cant strips, roofing, and
flashing. Ductwork must be attached to curb.
Accessory kits are available to aid in installing a new metal base
rail unit on an old roof curb.
Accessory kit number CPADCURB001A00, (small chassis) and
accessory kit number CPADCURB002A00, (large chassis)
includes roof curb adapter and gaskets for the perimeter seal
and duct openings. No additional modifications to curb are
required when using this kit.
462 01 2103 01
Slab Mount
Place the unit on a solid, level concrete pad that is a minimum of 4"
(102mm) thick with 2" (51mm) above grade (see Figure 2). The slab
should extend approximately 2" beyond the casing on all 4 sides of
the unit. Do not secure the unit to the slab except when required by
local codes.
Slab Mounting Details
FIGURE 2
OPTIONAL
RETURN
AIR
OPENING
2"
EVAP. COIL
STEP 3 — Field Fabricate Ductwork
Secure all ducts to roof curb and building structure on vertical
discharge units. Do not connect ductwork to unit. For horizontal
applications, unit is provided with flanges on the horizontal
openings. All ductwork should be secured to the flanges. Insulate
and weatherproof all external ductwork, joints, and roof openings
with counter flashing and mastic in accordance with applicable
codes.
Ducts passing through an unconditioned space must be insulated
and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return should be
ducted through the roof deck to comply with applicable fire codes.
A minimum clearance is not required around ductwork. Cabinet
return−air static shall not exceed −.25 inches water column.
OPTIONAL
SUPPLY
AIR
OPENING
COND. COIL
3
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