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

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.
- REDB Unit Installation Manual RECB Unit Installation Manual RDDC Unit Installation Manual RDCC Unit Installation Manual RDDB Unit Installation Manual RDCB Unit Installation Manual RDC Unit Installation Manual RCC Unit Installation Manual RDB Unit Installation Manual RCB Unit Installation Manual REDC Unit Installation Manual MAPSIV Unit Installation Manual MAPSIII Unit Installation Manual