Reznor YDSA Unit Installation Manual - Manual (Page 13)

Form I-Y, P/N 273646R6, Page 13
Installation Instructions for Down Discharge Roof Curbs, Option CJ31 and Option CJ34
1. Refer to FIGURE 6 shown on page 12 and layout the
two curb ends (letter D) and four side pieces (letters B
&C). Verify the side pieces are in the correct positions
(inlet air end vs control end).
2. Attach Curb Corners.
Using the hardware provided, create the corners by
attaching the ends to the side pieces.
16”
(406mm)
1-7/8”(48mm)
4” (102mm)
2 x 6 Wood
Nailer
1-1/2 x 3 lb
Fiberglass
Flashed by the
installer (flashing
must be under
lip of curb)
Lag Screw
and
Washer
Cap
Screws
3. Attach the Splice Plates.
Use the hardware provided to attach splice plates to
join the side rail pieces and create the perimeter of the
curb.
(4) Lag Screws with
washers - top row
(into the nailer)
}
(12) Cap Screws
with washers and nuts
- bottom three rows (cap screw heads
should be on insulation side of rail)
4. Attach the four Cross Supports.
At the holes in curb sides, line up the cross supports
in the orientation illustrated in FIGURE 6 shown on
page 12. Since the cross supports form the duct con-
nections, be certain that the vertical side of each cross
support is toward the duct opening.
Using two lag screws with washers, at each end of a
cross support, attach the support to the sides. Insert
the screws through the side and into the wood nailer.
Repeat for the other three cross supports.
5. Check the roof curb for squareness.
Adjust the curb so that the diagonal measurements
are equal within a tolerance of ±1/8”(3mm).
6. Level the roof curb.
To ensure a good weatherproof seal between the
cabinet curb cap and the roof curb, the curb must be
leveled in both directions with no twist end to end.
Shim as required and secure the curb to the roof deck
before installing flashing.
7. Install field-supplied flashing.
Roofing
Felts (by others)
Cant Strip
(by installer)
Counter Flashing
(by installer)
MUST be
sealed
between
curb cap and
roof curb.
2 x 6
Wood
Nailer
Insulation
Weld, bolt, or lag screw
curb to deck structure.
Curb
Cap Cabinet W
all
Roof Curb
}
8. Before placing the unit on the curb:
□
Apply 1/4” x 1-1/4” foam sealant tape to both the top
surface of the curb rails and the top surface of the
cross supports, being sure to make good butt joints
at all corners. The sealant tape must be applied to
prevent water leakage into the curb area due to blown
rain and capillary action.
□
Slide the duct work down into the supply (discharge)
and optional return air openings. See dimensions
in FIGURE 5, page 11. Duct work should have a
minimum 2” (51mm) duct flange.
□
When it is time to lift the unit onto the curb, comply
with rigging and lifting information in Paragraph 5.4.
IMPORTANT: Verify that the unit will be placed in the
correct airflow orientation to mate properly with the
discharge and return air openings. See FIGURE 13,
page 19.
FIGURE 7 - Curb Detail and Corner
FIGURE 8 - Attaching Spice Plates
FIGURE 9 -
Installed
Curb