Page 10
Installer’s Guide
Step 3—Review Location and Recommendation Information
1. Location of the unit must allow service clearance around it to
ensure adequate serviceability, maximum capacity, and peak
operating efficiency.
2. Refer to the Installation section for instruction on converting
the supply and return airflow covers to down airflow.
3. The field assembled Roof Mounting Curb (BAYCURB050A or
BAYCURB051A) or a field fabricated curb should be in place
before the unit is hoisted to the roof top.
The Roof Mounting Curb (frame) must be installed on a flat,
level section of the roof (maximum of 1/4" per foot pitch) and
provide a level mounting surface for the unit. Also, be sure to
provide sufficient height above the roof to prevent water from
entering the unit.
4. Be sure the mounting curb spans structural members (trusses)
of the roof, thereby providing sufficient support for the weight of
the unit, the curb, the duct(s), and any factory or field installed
accessories.
5. The unit must be mounted level for proper drainage of water
through the drain holes in the base pan.
6. Be sure the hole in the structure for the ducts is large enough
to accommodate the fabricated ducts and the insulation sur-
rounding them. 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.
7. Holes through exterior walls or roof must be sealed in accor-
dance with local codes.
8. These units are design for outdoor installation. They may be
installed directly on a slab, wood flooring, or on Class A, B, or
C roof covering material. The discharge air from the condenser
fans must be unrestricted for a minimum of 3 feet above the
unit.
9. Check the handling facilities to ensure the safety of personnel
and the unit(s).
Clearances
1. The recommended clearances for single-unit installations
are illustrated in Figures 1 through 6, pages 4-9.
2. Any reduction of the unit clearances indicated in these
figures may result in condenser coil starvation or the recircula-
tion of warm condenser air. Actual clearances, which appear
to be inadequate should be reviewed with a local engineer.
3. See the unit’s nameplate for the absolute minimum clear-
ance between the unit and any combustible surfaces.
Down Airow Units
NOTE: The unit is shipped for horizontal installation.
Horizontal Airow Units
1. Location of the unit must allow service clearance around
it to ensure adequate serviceability, maximum capacity, and
peak operating efficiency.
2. These units are design for outdoor installation. They
may be installed directly on a slab, wood flooring, or on Class
A, B, or C roof covering material. The discharge air from the
condenser fans must be unrestricted for a minimum of 3 feet
above the unit.
3. Check the handling facilities to ensure the safety of per-
sonnel and the unit.
4. The unit must be mounted level for proper drainage of
water through the drain holes in the base pan.
5. The unit should not be exposed to direct roof water runoff.
6. 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.
7. Holes through exterior walls or roof must be sealed in
accordance with local codes.
8. All fabricated outdoor ducts should be as short as possible.
Clearances
1. The recommended clearances for single-unit installations
are illustrated in Figures 1 through 6 pages 4-9.
2. Any reduction of the unit clearances indicated in these
figures may result in condenser coil starvation or the recircula-
tion of warm condenser air. Actual clearances, which appear
to be inadequate should be reviewed with a local engineer.
3. See the unit’s nameplate for the absolute minimum clear-
ance between the unit and any combustible surfaces.
Caution must be taken at all times to avoid personal injuries
and/or damage to equipment.
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