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Installer’s Guide
Note: If practical, install any internal accessories to the unit
at the shop.
3. Check the handling facilities to ensure the safety of personnel
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.
See Figure 9.
Step 3—Review Location and Recom-
mendation Information
Note: The unit is shipped for horizontal installation.
CAUTION MUST BE TAKEN AT ALL TIMES TO AVOID
PERSONAL INJURIES AND/OR DAMAGE TO EQUIPMENT
Horizontal Airflow 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 certified 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.
2. Any reduction of the unit clearances indicated in these figures
may result in condenser coil starvation or the recirculation 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 clearance
between the unit and any combustible surfaces.
1. Location of the unit must allow service clearance around it to
ensure adequate serviceability, maximum capacity, and peak
operating efficiency.
Note: If practical, install any internal accessories to the
unit at the shop.
2. Refer to the Installation section for instruction on convert-
ing 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. Be sure the hole in the structure for the ducts is large
enough to accommodate the fabricated ducts and the
insulation surrounding them. See Figures 13 and 14.
6. These units are design certified 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.
7. Exhaust vents or other sources of contaminated air should
not be near the unit’s air inlet if outside air is to be
introduced as make-up air or a ventilation feature is to be
used. Contamination from exhaust vents or chimneys may
also foul the condensor causing degraded performance.
8. Check the handling facilities to ensure the safety of
personnel and the unit(s).
Clearances
Refer to the Clearances section in the previous Horizontal
Airflow Units section.
Down Airflow Units
Clearances
1. The recommended clearances for single-unit installations are
illustrated in Figures 1 to 8.
