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1 downflow roof curbs for maps, Cabinets a, b, and c, Layout and components – Reznor RECC Unit Installation Manual User Manual

Page 11: Cabinets a, b, c, Units without energy recovery, Both option cj31 and cj34 (for maps

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Form I-MAPSIII&IV, P/N 222917R9, Page 11

If the application is sound sensitive, consider installing a field-supplied vibration isola-

tion curb or specialty sound attenuation curb.
Whether using an optional roof curb available with the system or a field-supplied curb,

the curb must be secure, square, and level. When the unit is being placed on a roof,

location depends on the roof structure and is the responsibility of the installer. For

condensate drainage and proper operation, it is important that the installation be level.
Position the curb so that the outside air inlet of the unit will not be facing into the pre-

vailing wind.
Always comply with the unit clearances in Paragraph 4.1.
Duct Connections - Optional down discharge roof curbs are designed for ductwork to

be inserted in the duct connection opening(s) from above the curb prior to setting the

unit on the curb.

5.4.1 Downflow Roof

Curbs for MAPS

®

Cabinets A, B, and C

Layout and Components

Both Option CJ31 and CJ34 (for MAPS

®

with an Energy Recovery Module) are 14"

(356mm) high insulated, downflow roof curbs. The curbs include integral duct connec-

tions for supply air and optional return air as illustrated in

FIGURE 7A and 8A. See

curb dimensions in

FIGURES 7C and 8C, and assembly instructions beginning on

pages 12 and 17.

* B Cabinet Size 500 and C Cabinet Size 1000 require optional duct furnace curb section.

H

F

A

B

E

G

C2

D1

C1

A

D2

B

A

C1

C2

D1

D2

E

H

G

A

F

B

B

Top View Examples Showing Field Assembly of Roof Curb, Option CJ31

Airflow

Airflow

Example of Cabinet A and C

Example of Cabinet B

FIGURE 7A - Roof Curb Components and

Layout for MAPS

®

Cabinets A, B, C

Curbs in

FIGURE 7A do not apply to a MAPS

®

unit with an optional energy recovery module.

For Option CJ34 with an energy recovery module

(Option ER1), go to Paragraph 5.4.1.2, page 14.

All curbs include corner hardware as listed below

and screws for attaching duct pieces.

Integral ducts are designed so that ductwork may

be either inserted down from the top or attached

from the bottom.

Seal tops of supply air "dividers" (C & D) that

mate with the blower or heat exchanger opening.

Seal tops of return air "dividers" (E, F, G, & H).

Seal tops of curb rails. Curb must be level.

Option CJ31 Roof Curb Corner Hardware (See FIGURE 7B.)

Hardware to Assemble and Attach Dividers to make

Duct Connections and Sealant Tape for Top of Rails

For

Top Two "Holes" (8) 5/16" x 1" Lag Screws, P/N 16243; (8) 5/16" Lockwasher, P/N 1333

For

Bottom Two

"Holes"

(8) 5/16" x 3/4" Hex Head Cap Screw,

P/N 16247; (8) 5/16" Lockwasher,

P/N 1333; (8) 5/16-18 Hex Nut, P/N 1035

(64) #10 Sheetmetal Screws,

P/N 11813

(1) 1/4" x 1-1/4" x 50' Foam Sealant Tape,

P/N 66302

5.4.1.1 Curb for Vertical (Down) Airflow (Option CJ31) - MAPS

®

units without energy recovery

Roof Curb P/N by Model/Size

See Model

Size /

Cabinet

Size Cross

Reference on

pages 71-72.

Cabinet A

Cabinet B

Cabinet C

Models RCB/RDB/RCC/RDC

-

All Cabinet A

-

-

All Cabinet B 190, 216, 248,

262, 272, 288

-

298, 410, 354,

370, 468, 482

-

Models RDCB/RDDB/RDCC/RDDC

100

150

200

250/500*

300

400

500

600

700/1000*

Models RECB/REDB/RECC/REDC

-

All Cabinet A

-

-

All Cabinet B

-

-

All Cabinet C

-

Roof Curb (Option CJ31) Package P/N

205660

205661

205662

205663

205664

208854

208855

208856

208857

Codes - FIG 1A Description:

Qty

Component P/N's

A

Curb End Assembly

2

204486

204487

208799

B

Curb Side Assembly

2

204485

208798

C1

Supply Air Duct End

1

204431

204432

207961

207960

207959

207958

C2

Supply Air Duct End

1

204431

204432

207965

207964

207963

207962

D1

Supply Air Duct Side

1

204433

204434

204436

204435

204437

207967

D2

Supply Air Duct Side

1

204433

204434

204436

204435

204437

207967

207971

E*

Return Duct End

1

204438

204439

207966

F*

Return Duct Side

1

204440

204441

207974

G*

Return Duct Side Angle

1

204444

207973

H*

Return Duct Rear Angle

1

204442

204443

207972

*If the system does not include optional return air, these pieces may be installed but are not required and will serve no function.