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Unit Installation
N N o o t t e e : : The factory ships this unit for horizontal
installation.
Ground Level Installation
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.
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
Clearances," p.
7.
N N o o t t e e : : 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.
I I m m p p o o r r t t a a n n t t : : 1" clearance to combustible material for
first three feet of air outlet duct length is
required for 4WCZ6060B4 460V unit
when an electrical heater is installed,
see unit nameplate for details. For the
other units, 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
N N o o t t e e : : Use the extreme mounting kit, BAYEXMK002AA, to secure the unit to the slab.
10
12, vibration support is a
"Determine Unit
Figure 3. Typical Ground Level Application
SIDING
SUPPLY
RETURN
AIR DUCT
AIR DUCT
EXTERIOR
WALL
INSULATE
WEATHERPROOF
FLEXIBLE DUCT
OR RAIN SHIELD
CONNECTORS
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
C C o o n n v v e e r r t t H H o o r r i i z z o o n n t t a a l l A A i i r r f f l l o o w w t t o o D D o o w w n n A A i i r r f f l l o o w w
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.
I I n n s s t t a a l l l l F F u u l l l l P P e e r r i i m m e e t t e e r r R R o o o o f f M M o o u u n n t t i i n n g g C C u u r r b b
1. Verify that the roof mounting curb is correct for the
unit. There are two curbs depending on the unit
cabinet sizes:
•
4WCZ6036 use model BAYCURB050A,
•
4WCZ6048–060 use model BAYCURB051A
2. Assemble and install the curb following the
instructions in the Installer's Guide included with
the appropriate curb.
OUTDOOR
AIR DISCHARGE
SUPPORT PAD
FOUNDATION
3/4" VIBRATION ISOLATORS, USE
7 ISOLATORS
18-BB35D1-16B-EN
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