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Step 4—Unit Installation
NOTE: The unit is shipped for horizontal installation.
Ground Level Installation
To install the unit at ground level:
1. Place the unit on a pad the size of the unit or larger. The unit
must be mounted level for proper drainage of water through
the holes in the base pan.
The pad must not come in contact with the structure (see
Figure 7, below.) Be sure the outdoor portion of the supply
and return air ducts are as short as possible.
2. Location of the unit must allow service clearance around it.
Clearance of the unit must be given careful consideration.
See Figures 1 through 6, pages 4-9.
NOTE: Any reduction of the unit clearances indicated in
these illustrations 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. Attach the supply and return air ducts to the unit as ex-
plained in the Ductwork Installation section (page 15).
4. Flexible duct connectors must be of a flame retardant material.
Insulate any ductwork outside of the structure with at least two
(2) inches of insulation and weatherproof. There must be a
weatherproof seal where the duct enters the structure.
5. The unit should not be exposed to direct roof water runoff.
6. Seal all holes through exterior walls in accordance with local
codes.
7. Continue with the following installation sections to complete
the installation: Ductwork (page 15), Filter (page 16), and
Electrical Wiring (page 16).
SHIELD
Figure 7. Typical Ground Level Applications
Installer's Guide
Rooftop Installation -- Curb Mounting
Convert Horizontal Airflow to Down Airflow
The factory ships the unit for horizontal airflow. Perform this
procedure to convert it to down airflow:
1. Remove the three (3) sheet metal screws securing the supply air
cover and the four (4) sheet metal screws securing the return air
cover from the base of the unit. Remove the covers from the base.
See Figure 8, page 12.
2. Place the covers over the horizontal supply and return openings
(painted side out). Align the screw holes, and secure using the
same screws removed in step 1.
Install Full Perimeter Roof Mounting Curb
1. Verify that the roof mounting curb is correct for the unit.
• 4WCZ6036 uses model BAYCURB050A.
• 4WCZ6048 and 4WCZ6060 use model BAYCURB051A.
2. Assemble and install the curb following the instruction in the
appropriate Installer's Guide.
Lifting and Rigging
1. Before preparing the unit for lifting, check the unit dimension
drawings for center of gravity for lifting safety (Figures 1 to 6).
Because of placement of internal components, the unit's weight
may be unevenly distributed. Approximate unit weights are
also provided in the unit drawings.
NOTE: Unit rigging and hoisting requires accessory kit
BAYLIFT002AA. It includes a kit of four (4) lifting lugs. See
Figure 9 inset B.
ISOLATORS
(1 PER CORNER &
1 IN MIDDLE OF
EACH LONG SIDE)
NOTE: Use the extreme
mounting kit, BAYEXMK003AA,
to secure the unit to the slab.
Page 11
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