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Unit Installation
N N o o t t e e : : The factory ships this unit for horizontal
installation.
Install Flue Hood
1. Locate the Flue Hood in the literature package.
2. Remove the two Flue Hood mounting screws from
the unit. They are located to the right of the Power
Entry connection panel.
3. Attach the Flue Hood to the unit with the two
screws removed in step two. Refer to
Unit Clearances," p. 8
Flue Hood.
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. 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 3, p.
recommendation, not a requirement.
2. The louvers above and below the Flue Hood in the
side panel must have adequate clearance around
the air opening into the combustion area.
3. Location of the unit must allow service clearance
around it. Clearance of the unit must be given
careful consideration. See
Clearances," p.
8.
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 : : A minimum clearance of 0.0" to
combustible material shall be maintained
on air outlet duct.
12
"Determine
for correct orientation of the
14, vibration support is a
"Determine Unit
4. Attach the supply and return air ducts to the unit as
explained in the Ductwork Installation section.
5. 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.
6. Do not expose the unit to direct roof water runoff.
7. Seal all holes through exterior walls in accordance
with local codes.
8. Continue with the following installation sections to
complete the installation: "Ductwork, Gas Piping,
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. See
Table 2, p.
13.
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. There are two curbs depending on the unit
cabinet sizes:
•
4YCZ5024 - 5036 use model BAYCURB050
•
4YCZ5048 - 5060 use model BAYCURB051
2. Assemble and install the curb following the
instructions in the Installer's Guide included with
the appropriate curb.
18-EB41D1-1C-EN
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