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0 mounting (cont'd), 3 mounting on a roof curb (cont'd), 2 curbs for horizontal airflow – Reznor YDSA Unit Installation Manual User Manual

Page 14

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Form I-Y, P/N 273646R6, Page 14

5.3.2 Curbs for Horizontal Airflow

Options CJ48 and CJ55 are 36" (914mm) high roof curbs designed for horizontal discharge. The curbs include plenum

sections for ducting supply air and optional return air to the duct connections in the side of the curb.

2x6

Wood

Nailer

36”

(914mm)

Curb Side

Cross-Section

Installation NOTES:

Plenum ducts in the curb have

insulated bottom and side

panels. Always install all four

side panels. If the system does

not have return air, attach a

field-fabricated cover over the

return air opening in the curb.

(Without return air, the bottom of

the unit is solid.)

Horizontal

Airflow Curb Options CJ4

8 and CJ55

(Inlet Hood End of Unit)

(Control End

of Unit)

Return Air

Plenum

Supply

Air Plenum

(Condenser Side of Unit - Condenser base will be

above the duct connections and extends

30”/762mm beyond the curb side.)

FIGURE 10 - Layout,

Dimensions, and

Weights of Option

CJ48 and CJ55

Horizontal Roof

Curbs

B

Dim

Unit

Airflow

Return

Air

Plenum

Duct

in the

Curb

Supply Air

Plenum

Duct in

the Curb

Top View of Curb

A Dim

Duct Connection Side View of Curb

Duct

Connection - Return Air

Horizontal

Duct

Connection

- Supply Air

24

(610)

24

(610)

33 (838)

18 (457)

Option Description

Cabinet

Size*

A Dim

B Dim

(Outside of Curb Rails)

CJ48

Horizontal Discharge

Curb for YDHA,

YDMA, or YDSA

without an energy

recovery wheel

1

119-11/16

(3040)

43-7/16

(1103)

2

123-11/16

(3141)

50-11/16

(1287)

3

154-11/16

(3929)

63-11/16

(1618)

CJ55

Horizontal Discharge

Curb for YDHA,

YDMA, or YDSA

with

an energy recovery

wheel

1

128

(3251)

43-7/16

(1103)

2

132

(3353)

50-11/16

(1287)

3

154-11/16

(3929)

63-11/16

(1618)

Weights by Cabinet Size - Horizontal Airflow

Roof Curb Option CJ48 and CJ55

* See chart on page 68 for cross-reference by Model Size

or Model and Heat Size to Cabinet Size.

Roof Curb

*Cabinet 1

*Cabinet 2

*Cabinet 3

lbs

kg

lbs

kg

lbs

kg

Option CJ48

555

252

599

272

686

311

Option CJ55

570

259

615

279

686

311

Dimensions - inches (mm)

CAUTION: Before installation, recheck to be sure that the correct curb has been ordered. Be sure

that the curb selected matches the unit ordered. Verify the dimensions of the curb received with the

appropriate dimension table.

* See chart on page 68 for cross-reference by Model

Size or Model and Heat Size to Cabinet Size.

5.3 Mounting on a Roof Curb (cont'd)

5.0 Mounting (cont'd)

This manual is related to the following products: