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18-BB41D1-1C-EN

Review Location and Recommendation Information

HHoorriizzoonnttaall AAiirrffllooww UUnniittss

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 designed 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.

3. Check the handling facilities to ensure the safety of

personnel and the unit(s).

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.

CClleeaarraanncceess

1. The recommended clearances for single-unit

installations are illustrated in “Determine Unit

Clearances,” p. 7.

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.

DDoowwnn AAiirrffllooww UUnniittss

1. Location of the unit must allow service clearance

around it to ensure adequate serviceability,

maximum capacity, and peak operating efficiency.

2. Refer to the Installation section for instruction on

converting 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. The unit must be mounted level for proper drainage

of water through the drain holes in the base pan.

6. Be sure the hole in the structure for the ducts is

large enough to accommodate the fabricated ducts

and the insulation surrounding them. 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. 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.

9. Check the handling facilities to ensure the safety of