10
18-BB41D1-1C-EN
Unit Installation
NNoottee:: The factory ships this unit for horizontal
installation.
Ground Level Installation
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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. To
attach the unit securely to the slab, use extreme
mounting kit, BAYEXMK003A. Usage of the
extreme mounting kit accessories is a
recommendation, not a requirement.
The pad must not come in contact with the
structure. Be sure the outdoor portion of the supply
and return air ducts are as short as possible. As
indicated in Table 1, p. 12, vibration support is a
recommendation, not a requirement.
2. Location of the unit must allow service clearance
around it. Clearance of the unit must be given
careful consideration. See “Determine Unit
Clearances,” p. 7.
NNoottee:: 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.
IImmppoorrttaanntt:: A minimum 0" clearance to combustible
material shall be maintained on air
outlet duct.
3. Attach the supply and return air ducts to the unit as
explained in the ductwork Installation section.
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. Do not expose the unit 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, Filter and
Electrical Wiring.
Rooftop Installation — Curb
Mounting
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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.
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.
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1. Verify that the roof mounting curb is correct for the
unit. There are two curbs depending on the unit
cabinet sizes:
• 4WCC4024–036 use model BAYCURB050A,
• 4WCC4042–060 use model BAYCURB051A
2. Assemble and install the curb following the
instructions in the Installer's Guide included with
the appropriate curb.
Figure 3. Typical Ground Level Application
NNoottee:: Use the extreme mounting kit, BAYEXMK002AA, to secure the unit to the slab.
SIDING
RETURN
AIR DUCT
SUPPLY
AIR DUCT
EXTERIOR
WALL
INSULATE
WEATHERPROOF
OR RAIN SHIELD
FLEXIBLE DUCT
CONNECTORS
OUTDOOR
AIR DISCHARGE
SUPPORT PAD
FOUNDATION
3/4” VIBRATION ISOLATORS, USE
7 ISOLATORS
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