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PY5G--B: Installation Instructions
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.
If the unit is to be mounted on a curb in a downflow application, review
Step 9 to determine which method is to be used to remove the downflow
panels before rigging and lifting into place. The panel removal process
may require the unit to be on the ground.
Step 2 – Provide Unit Support
For hurricane tie downs, contact distributor for details and PE
(Professional Engineering) Certificate if 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.
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.
Installation on older "G" series roof curbs.
Two accessory kits are available to aid in installing a new "G" series unit
on an old "G" roof curb.
1. 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 the curb are required
when using this kit.
2. An alternative to the adapter curb is to modify the existing curb by
removing the outer horizontal flange and use accessory kit number
CPGSKTKIT001A00 which includes spacer blocks (for easy
alignment to existing curb) and gaskets for the perimeter seal and
duct openings. This kit is used when existing curb is modified by
removing outer horizontal flange
.
CAUTION
!
UNITS/STRUCTURAL DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Ensure there is sufficient clearance for saw blade when cutting the outer
horizontal flange of the roof curb so there is no damage to the roof or
flashing.
Slab Mount
Place the unit on a solid, level pad that is at least 2 in. (51 mm) above
grade. The pad should extend approximately 2 in. (51 mm) beyond the
casing on all 4 sides of the unit. (See
the pad except when required by local codes.
OPTIONAL
RETURN
AIR
OPENING
(50.8mm)
EVAP. COIL
Fig. 2 – Slab Mounting Details
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig.
2.) Do not secure the unit to
OPTIONAL
SUPPLY
AIR
OPENING
COND. 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.
Read unit rating plate for any required clearances around ductwork.
Cabinet return-air static shall not exceed -.25 IN. W.C.
Step 4 – Provide Clearances
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.
The required minimum operating and service clearances are shown in
Fig. 3
and
Fig.
4. Adequate combustion, ventilation and condenser air
must be provided.
IMPORTANT: Do not restrict outdoor airflow. An air restriction at
either the outdoor-air inlet or the fan discharge may be detrimental to
compressor life.
The condenser fan pulls air through the condenser coil and discharges it
through the top grille. Be sure that the fan discharge does not recirculate
to the condenser coil. Do not locate the unit in either a corner or under an
overhead obstruction. The minimum clearance under a partial overhang
(such as a normal house overhang) is 48-in. (1219 mm) above the unit
top. The maximum horizontal extension of a partial overhang must not
exceed 48-in. (1219 mm).
Do not place the unit where water, ice, or snow from an overhang or roof
will damage or flood the unit. Do not install the unit on carpeting or
other combustible materials. Slab-mounted units should be at least 2 in.
(51 mm) above the highest expected water and runoff levels. Do not use
unit if it has been under water.
Step 5 – Rig and Place Unit
PERSONAL INJURY OR PROPERTY DAMAGE
HAZARD
Failure to follow this warning could result in personal injury, death or
property damage.
When installing the unit on a rooftop, be sure the roof will support the
additional weight.
Rigging and handling of this equipment can be hazardous for many
reasons due to the installation location (roofs, elevated structures, etc.).
Only trained, qualified crane operators and ground support staff should
handle and install this equipment.
When working with this equipment, observe precautions in the literature,
on tags, stickers, and labels attached to the equipment, and any other
safety precautions that might apply.
Training for operators of the lifting equipment should include, but not be
A07926
limited to, the following:
1. Application of the lifter to the load, and adjustment of the lifts to
adapt to various sizes or kinds of loads.
3
WARNING
!
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