Reznor YDSA Unit Installation Manual - Manual (Page 10)

Form I-Y, P/N 273646R6, Page 10
5.0 Mounting
5.1 Unit Weights
For unit weights and or corner weights, refer to www.ReznorHVAC.com or call 1-800-695-1901. Specific unit weights
will be supplied by order number which will include the weights of the options specified for that specific unit.
5.2 Curb Cap Base
and Mounting
These packaged systems have a
curb cap base designed for use with
a full perimeter curb. When on a roof,
either a manufacturer-designed roof
curb or a field-supplied roof curb is
required.
NOTE: A Reznor
® designed roof
curb with integral vertical duct
work supports is recommended to
provide a weatherproof installation.
Base design varies by cabinet size.
MUST be sealed
between curb cap
rail and roof curb.
Optional or
Field-Supplied
Roof Curb fits
under and inside
the curb cap.
Base of curb cap edge
Edge of curb cap
extends down over
the roof curb.
Cabinet W
all
Curb
Cap Rail
Curb Cap
Section
View
5.3 Mounting on a Roof Curb
Two types of fully enclosed curbs are available with these systems.
Roof
Curbs
Option Optional Energy
Recovery Wheel Description
CJ31 No 16” (406mm), Down Discharge with
Duct Supports in the Curb CJ34 Yes
CJ48 No 36” (914mm), Horizontal Discharge
with Duct Connections in the Curb CJ55 Yes
If the application is sound sensitive, consider installing a field-supplied vibration iso-
lation curb or specialty sound attenuation curb. Whether using an optional roof curb
available with the system or a field-supplied speciality curb, the curb must be secured,
on 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.
When positioning the curb, always comply with the required clearances in Paragraph
4.1. Check the dimensions carefully, remembering that the condenser section will
extend 30” (762mm) beyond the edge of the curb. (See orientation in FIGURE 13,
page 19). Position the curb so that the outside air inlet of the unit will not be facing into
the prevailing wind.
Duct Connections - Optional down discharge roof curbs are designed for duct work
to be inserted in the duct connection opening(s) from above the curb prior to setting
the unit on the curb.