18-EB32D1-1E-EN
13
bars for protection during lifting. Always test-lift the
unit to determine the exact unit balance and
stability before hoisting it to the installation
location.
4. When the curb and air ducts have been properly
installed, the unit is ready to be hoisted to the roof
and set in position.
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the unit when hoisting use “spreader
bars”.
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ntt:: The unit must be lowered into position. The
P.V.C. rubber tape on the curb flange
permits the unit to be repositioned if
required without destroying the P.V.C.
rubber seal affixed to the mounting curb.
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1. The unit is designed with a perimeter drip lip that is
lower than the unit base pan. See
inset “A”.
2. Position the unit drip lip down over and in contact
with the outside corner of the curb as illustrated in
, inset “A”. Continue to lower the unit
on top of the curb, with the unit drip lip astraddle,
and in contact with, both the end and side rail of the
curb. The unit should now rest on top of the curb.
Use the extreme mounting kit, BAYEXMK001A, to
add additional hold down strength to the mounting.
N
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e:: The ductwork is installed as part of the curb
installation. Do not attach ductwork to the unit
and lower the unit with ductwork onto the curb.
Table 1.
Vibration Isolators/Snow Feet Locations
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Small Cabinet
****4024 - 4036
Medium Cabinet
****4042 - 4060
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For rooftop applications using field fabricated frame
and ducts use the following procedure:
1.
Locate and secure the frame to the roof by bolting
or welding. Frame must provide adequate center
support via a cross member centrally located
channel rail. Three (3) sleeper rails are required.
One on each end to support the edges of the unit
and one across the center of the unit. The center rail
must run inside both drip lips. Vibration isolators
should be installed as indicated in
adjust as necessary for your frame. The isolators
must be placed on base pan, not drip lip. Add
flashing as required. Flashing must conform to local
building codes.
2. Prepare the hole in the roof in advance of installing
the unit.
3. Secure the horizontal or down airflow ducts to the
roof. Refer to the previous Convert from Horizontal
Airflow to Down Airflow section if conversion is
needed.
4. All fabricated outdoor ducts should be as short as
possible.
5. Place the unit on the frame.
6. The unit must be mounted level for proper drainage
of water through the holes in the base pan.
7. Secure the unit to the frame.
8. Insulate any ductwork outside of the structure with
at least two (2) inches of insulation and then
weatherproof. There must be a weatherproof seal
where the duct enters the structure.
9. The unit should not be exposed to direct roof water
runoff.
10. Flexible duct connectors must be of a flame
retardant material. All duct work outside of the
structure must be insulated and weatherproofed in
accordance with local codes.
11. Access and service clearances for the unit must be
given careful consideration when locating the duct
entrance openings. See unit dimensions.
12. Continue with the following installation sections to
complete the installation: Ductwork, Gas Piping,
Filter, and Electrical Wiring.
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