Form I-MAPSIII&IV, P/N 222917R9, Page 11
If the application is sound sensitive, consider installing a eld-supplied vibration isola-
tion curb or specialty sound attenuation curb.
Whether using an optional roof curb available with the system or a eld-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 Downow 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, downow 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.
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) Airow (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.
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