Reznor ADFH Option - Installation - Roof Curbs Assembly - Manual (Page 35)

Form I-OPT-C, P/N 132900 R17, Page 35
2x6
Wood
Nailer
36”
(914mm)
Curb Side
Cross-Section
Horizontal
Airflow Curb Options CJ48 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 14A - Layout, Dimensions, and Weights of Option CJ48 and CJ55 Horizontal Roof Curbs
B
Unit
Airflow
Return
Air
Plenum
Duct
in the
Curb
Supply Air
Plenum
Duct in
the Curb
Top View of Curb
A
Duct Connection Side View of Curb
Duct
Connection - Return Air
Horizontal
Duct
Connection
- Supply Air
24
(610)
24
(610)
33 (838) 18 (457)
C
E G F H
D
Option Description
Cabinet
Size*
A B C D
E** F** G H
(Outside of Curb Rails) (Area Inside the Curb*)
CJ48
Horizontal
Discharge
Curb for YDHA,
YDMA, or
YDSA without
an energy
recovery wheel
1
119-11/16
(3040)
43-7/16
(1103)
11-15/16
(2945)
39-11/16
(1008)
36-5/32
(918)
20-15/16
(532)
22-13/16
(579)
12-31/32
(329)
2
123-11/16
(3141)
50-11/16
(1287)
119-15/16
(3046)
46-15/16
(1192)
36
(915)
20-3/4
(528)
22-15/16
(582)
17-15/16
(455)
3
154-11/16
(3929)
63-11/16
(1618)
150-15/16
(3834)
59-15/16
(1522)
35-5/16
(897)
22-5/16
(567)
25-27/32
(656)
27-9/16
(700)
CJ55
Horizontal
Discharge
Curb for YDHA,
YDMA, or
YDSA with
an energy
recovery wheel
1
128
(3251)
43-7/16
(1103)
124-1/4
(3156)
39-11/16
(1008)
36-5/32
(918)
20-16/16
(532)
22-13/16
(579)
21-9/32
(540)
2
132
(3353)
50-11/16
(1287)
128-1/4
(3257)
46-15/16
(1192)
36
(915)
20-3/4
(528)
22-15/16
(582)
26-1/4
(667)
3
154-11/16
(3929)
63-11/16
(1618)
150-15/16
(3834)
59-15/16
(1522)
35-5/16
(897)
22-5/16
(567)
25-27/32
(656)
27-9/16
(700)
Dimensions for Option CJ48 & CJ55 - inches (mm)
7.2 Roof Curbs for Horizontal Airflow - Options CJ48 & CJ55
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.
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
Weights of Horizontal Airflow Roof Curb Option CJ31 and CJ34 by Cabinet Size
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 a return air, attach a
field-fabricated cover over the return air opening in the curb.
(Withour return air, the bottom of the unit is solid.)
* Area enclosed by the roof curb must comply with clearance to combustible materials. If the roof is constructed of combustible
materials, area within the roof curb must be ventilated, left open, or covered with non-combustible material which has an “R”
value of at least 5. If area within curb is left open, higher radiated sound levels may result. NOTE: If installing a unit with a high
efficiency, condensing gas-fired heat section, the area within the curb must be left open.
** When cutting only duct openings, cut “E” & “F” dimensions 1/4” (6.4mm) in from duct opening to allow clearance. Cut the curb
rail sides of the duct opening(s) parallel to the curb rail. For Cabinet Size 1, measure a maximum of 1-1/2” (38mm) from the side
rail. For Cabinet Size 2, measure a maximum of 3/4” (19mm) from the side rail. For Cabinet Size 3, measure a maximum of
1-1/4"(32mm) from the side rail.