Reznor ADFH Option - Installation - Roof Curbs Assembly - Manual (Page 37)

Form I-OPT-C, P/N 132900 R17, Page 37
Installation Instructions for Cabinet Sizes 1 & 2 Horizontal Curb, Option CJ48 and Option CJ55
1. Refer to FIGURE 14B shown on page 36 and position
the two curb ends (Item A) and four side pieces (Items
B, C, D, E). Verify the side pieces are positioned cor-
rectly (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 (Item 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 ( Item F) joining the
side pieces ( Items B&D and Items C&E) to complete
the perimeter of the curb.
4. Attach the Two Outer Plenum Side Panels (Item 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 sheetmetal screws.
5. Install the Plenum Duct Bottom Panel (Item 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 sheetmetal screws.
6. Install the Two Inner Plenum Side Panels (Item J).
Position one insulated side panel as illustrated and
align the holes. Attach with sheetmetal screws to sides
and bottom. Repeat to install the other side panel.
7. Install Baffle in the Supply Air Plenum (Item K).
Position the baffle between the insulated side panels
( Items G&J) as illustrated and align the holes. Attach
with sheetmetal screws.
8. Attach the Duct Flanges (Items L & M). Using sheet-
metal screws, attach the duct flange (Item L) around
the supply opening and the smaller duct flange ( Item
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 (reference Figure 13E on page 34
for flashing information). 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.
IMPORTANT: Verify that the unit will be placed in the
correct airflow orientation to mate properly with the
discharge and return air openings.