Reznor YDSA Unit Installation Manual - Manual (Page 16)

Form I-Y, P/N 273646R6, Page 16
Installation Instructions for Cabinet Sizes 1 & 2 Horizontal Airflow Roof Curbs, Option CJ48 and
Option CJ55
1. Refer to FIGURE 11 shown on page 15 and position
the two curb ends (letter A) and four side pieces
(letters B, C, D, E). Verify the side pieces are
positioned correctly (shorter piece at the inlet air end
and longer piece at the control end of the unit).
2. Attach Curb Corners.
Using the hardware provided (lag screw and washer
in top holes; cap screw, washer, and nut in the 4 holes
below the wood nailer), create the four corners by
attaching the ends to the side pieces.
3. Attach the two Side Splice Plates (letter F).
Use the hardware provided (lag screw and washer in
top holes; cap screw, washer, and nut in the 4 holes
below the wood nailer) to attach splice plates ( letter F)
joining the side pieces ( letters B&D and letters C&E)
to complete the perimeter of the curb.
4. Attach the Two Outer Plenum Side Panels (letter G).
Position each insulated panel with the wide bottom
flange toward the center. Align the panel with the holes
in the curb sides and attach with sheet metal screws.
5. Install the Plenum Duct Bottom Panel (letter H).
Lower the insulated bottom panel into the curb, resting
it on the flanges of the two panels installed in Step 4.
Attach the bottom panel with sheet metal screws.
6. Install the Two Inner Plenum Side Panels (letter J).
Position one insulated side panel as illustrated and
align the holes. Attach with sheet metal screws.
Repeat to install the other side panel.
7. Install the Baffle in the Supply Air Plenum (letter K).
Position the baffle between the insulated side pan-
els ( letters G & K) as illustrated and align the holes.
Attach with sheet metal screws.
8. Attach the Duct Flanges (letters L & M).
Using sheet metal screws, attach the duct flange
(letter L) around the supply opening and the smaller
duct flange ( letter M) around the return air opening. If
the installation does not have return air, attach a field-
fabricated cover over the return air opening.
9. Check the Squareness, Level the Curb, and Install
the Flashing.
Adjust the curb so that the diagonal measurements are
equal within a tolerance of ±1/8”(3mm).
To ensure a good weatherproof seal between the
cabinet curb cap and the perimeter of the 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.
Install field-supplied flashing.
10. 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 duct sides.
5.3.2 Curbs for Horizontal Airflow (cont’d)
5.3 Mounting on a Roof Curb (cont'd)
5.0 Mounting (cont'd)