Reznor ZQYRA Unit Installation Manual - Manual (Page 6)

Form I-ZQYRA P/N 260414R5, Page 6
5.3 Curb Cap Base
and Mounting
FIGURE 4 -
Rigging and
Lifting
SIDE VIEW
of Unit
After test lift, adjust cable
length as needed so that the
unit will remain horizontal
throughout the lift.
To prevent damage to
the cabinet, spreader
bars are REQUIRED.
FRONT VIEW
of Unit
To prevent damage to
the cabinet, spreader
bars are REQUIRED.
Lifting Lug with
1-1/2” ( 38mm)
diameter hole -
(4) one on each
corner
This unit is equipped with a load-bearing curb cap. The curb cap has bolted seams
and is designed so that it may be set on perpendicular supports or over a roof curb. A
curb is required if the application uses vertical (down) discharge and or vertical (down)
return air.
Because of condensate drain requirements, setting this unit directly on a flat surface
(cement slab) is not recommended.
Be sure to comply with clearances in
FIGURE 2, page 5. It is recommended that this
ventilation unit be positioned so that the outside air inlet hood is not facing into the
prevailing wind.
5.3.1 Mounting
without a Roof Curb
FIGURE 5 -
Locations for
Field-Supplied
Rail Cross
Supports
The Reznor ® curb, Option CJ3C, is a 16” (406mm) high, fully enclosed, insulated curb.
If the application is sound sensitive, consider installing a field-supplied vibration isola-
tion curb or specialty sound attenuation curb. Whether using the optional roof curb
available with the system or a field-supplied curb, the curb must be secure, square,
and level.
When using a field-supplied curb with vertical ductwork, field-fabricated custom duct
connections will be required as there are no duct flanges on the unit.
The top surface of the roof curb must be caulked with 1/4” x 1-1/4” sealant tape or two
1/4” beads of suitable sealant. The unit must be sealed to the curb to minimize sound
transmission, prevent air leakage, and to prevent water leakage into the curb area due
to wind blown rain and capillary action.
5.3.2 Mounting on a
Roof Curb
IMPORTANT NOTE:
Unit must be level.
5.0 Mounting
(cont’d)
5.2 Rigging and
Lifting (cont’d)
Prior to installation, be sure that the method of support is in agreement with all local
building codes and is suited to the climate. If considering an installation without a roof
curb in snow areas, it is recommended that the support under the system be at least
12” (305mm) higher than the roof surface.
If setting cross supports on the roof surface and not decking, be sure to have sufficient
tread material under the supports to adequately spread the load and prevent “sinking”
into the roofing material. The field-supplied, weather resistant, cross-support structure
must be secure and adequate for the weight of the unit (Refer to Paragraph 5.1).