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
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)