Reznor YDSA Unit Installation Manual - Manual (Page 11)

Form I-Y, P/N 273646R6, Page 11
5.3.1 Down flow Roof
Curbs
Both Option CJ31 and CJ34 are 16" (406mm) high roof curbs designed for vertical
(down) discharge. These curbs include integral cross supports for supply air and
optional return air duct work.
FIGURE 5 - Layout, Dimensions, and Weights of Option CJ31 & CJ34 Roof Curbs
Suppl
y
Air
Return
Air
Downflow Curb Options CJ31 and
CJ34
2x6
Wood
Nailer
Insulation
16”
(406mm)
Cross-Section
View
(Control End of Unit)
(Inlet Hood End)
(Condenser Side of Unit - Base extends
30” / 761mm beyond this side of c
urb.)
Return
Air
(DxF)
Supply
Air
(DxE)
Unit
Airflow
A
B D
E F
Top View
C
G H
Curb
Layout
Option Model and Size
Cabinet
Size
A B C D
E** F** G H
(Outside of Curb Rails) (Area Inside the Curb*)
CJ31
No Energy
Wheel
YDHA & YDMA 060,
090, 120, 150
1
119-11/16
(3040)
43-7/16
(1103)
115-15/16
(2945)
39-11/16
(1008)
31
(787)
17
(432)
25-3/4
(654)
14-29/32
(379)
YDHA & YDMA 180,
210, 240 YDSA 120, 150
2
123-11/16
(3141)
50-11/16
(1287)
119-15/16
(3046)
46-15/16
(1192)
31
(787)
19
(483)
25-13/16
(656)
18-13/16
(478)
YDHA & YDMA, 300,
360 YDSA 180, 210
3
154-11/16
(3929)
63-11/16
(1618)
150-15/16
(3834)
59-15/16
(1522)
31
(787)
21
(483)
28-7/32
(717)
28
(711)
CJ34
With Energy
Wheel
YDHA & YDMA 060,
090, 120, 150
1
128
(3251)
43-7/16
(1103)
124-1/4
(3156)
39-11/16
(1008)
31
(787)
17
(432)
25-3/4
(654)
23-1/4
(591)
YDHA & YDMA180, 210,
240 YDSA 120, 150
2
132
(3353)
50-11/16
(1287)
128-1/4
(3257)
46-15/16
(1192)
31
(787)
19
(483)
25-13/16
(656)
27-1/8
(689)
YDHA & YDMA, 300,
360 YDSA 180, 210
3
154-11/16
(3929)
63-11/16
(1618)
150-15/16
(3834)
59-15/16
(1522)
31
(787)
21
(483)
28-7/32
(717)
28
(711)
Weights of Downflow Roof
Curb Option CJ31 and CJ34
by Cabinet Size
Roof
Curb
Cabinet 1 Cabinet 2 Cabinet 3
lbs kg lbs kg lbs kg
Option
CJ31
237 108 257 117 322 146
Option
CJ34
248 112 268 122 322 146
* 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) in from the side rail.
For Cabinet Size 2, measure a maximum of 3/4” (19mm) in from
the side rail.
*** See chart on page 68 for cross-reference by Model Size or
Model and Heat Size to Cabinet Size.
Dimensions - inches (mm)