Reznor ADFH Option - Installation - Roof Curbs Assembly - Manual (Page 3)

Form I-OPT-C, P/N 132900 R17, Page 3
Roof Curb P/N by Model/Size See Model
Size /
Cabinet
Size Cross
Reference
on page 2.
Cabinet A Cabinet B Cabinet C
Models RCB/RDB/RCC/RDC - All Cabinet A - - All Cabinet B 190, 216, 248,
262, 272, 288
-
298, 410, 354,
370, 468, 482
-
Models RDCB/RDDB/RDCC/RDDC 100 150 200 250/500 300 400 500 600 700/1000
Models RECB/REDB/RECC/REDC - All Cabinet A - - All Cabinet B - - All Cabinet C -
Roof Curb (Option CJ31) Package P/N 205660 205661 205662 205663 205664 208854 208855 208856 208857
Codes - FIG 1A Description: Qty Component P/N's
A Curb End Assembly 2 204486 204487 208799
B Curb Side Assembly 2 204485 208798
C1 Supply Air Duct End 1 204431 204432 207961 207960 207959 207958
C2 Supply Air Duct End 1 204431 204432 207965 207964 207963 207962
D1 Supply Air Duct Side 1 204433 204434 204436 204435 204437 207967
D2 Supply Air Duct Side 1 204433 204434 204436 204435 204437 207967 207971
E* Return Duct End 1 204438 204439 207966
F* Return Duct Side 1 204440 204441 207974
G* Return Duct Side Angle 1 204444 207973
H* Return Duct Rear Angle 1 204442 204443 207972
*If the system does not include optional return air, these pieces may be installed but are not required and will serve no function.
Installation Instructions
for Down Discharge
Roof Curb, Option
CJ31, for MAPS ®
Cabinet Sizes A, B,
and C
NOTE: For A, B, or C with
energy recovery Option
ER1, see page 5.
CAUTION: Before installation, recheck to be sure that the correct curb has been ordered. Be sure
that the curb selected matches the unit ordered. Verify the dimensions of the curb received with the
appropriate dimension table.
1. Position the roof curb ends (Code A) and sides (Code B) as shown in the drawing
in FIGURE 1A. Fasten with bolts and lag screws as illustrated in the corner detail
( FIGURE 1B).
2. Install bottom opening ductwork. Use the sheetmetal screws to attach the dividers
( Codes C1, C2, D1, D2, E, & F in FIGURE 1A). Attach the return air duct angles
( Codes G & H) to the attached end and side and to the roof curb. NOTE: If the
system does not have a return air opening, Codes F, G, & H may be installed in
the curb but are not required.
3. Check the roof curb for squareness. The curb must be adjusted so that the
diagonal measurements are equal within a tolerance of ±1/8” (±3mm).
4. Level the roof curb. To ensure a good weatherproof seal between the unit curb cap
and the roof curb, the roof curb must be leveled in both directions with no twist end
to end. Shim as required and secure curb to the roof deck before installing flashing
(See Curb Detail in FIGURE 1B).
5. Install field-supplied flashing.
FIGURE 1B - Option
CJ31 Downflow Roof
Curb Cross Section and
Corner Detail
MUST be sealed
between curb cap
and top of curb
Cabinet
2x4 Wood Nailer
Counter Flashing
(by installer)
Cant Strip
(by installer)
Weld, bolt, or lag screw curb to deck structure.
Roofing Felts
(by others)
Insulation
14”
(356mm)
1-7/8”(48mm)
4”
(102mm)
2 x 4 Wood
Nailer
1-1/2 x 3 lb
Fiberglass
Flashed by the
installer (flashing
must be under lip
of curb)
Lag Screw
Cap
Screws
Curb Detail
Corner Detail
Curb
Section
6. Before placing the MAPS ® unit or optional duct furnace (Option JH25 or JH30) on the curb:
□
If ductwork is being installed from the top, slide the ductwork down into the discharge and return air openings. Ductwork
should be sized slightly smaller with a minimum 3/4" duct flange that will rest on and be attached to all sides of the duct
connection. See the system installation manual for ductwork requirements.
□
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 perimeter of the
integral dividers, 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.
□
If installing an optional duct furnace curb section (Option JH), place it on the roof curb before the unit. Follow the
instructions in the unit installation manual (Form I-MAPSIII&IV).
□
When it is time to lift the MAPS ® unit or optional duct furnace onto the prepared curb (See Rigging and Lifting in the unit
installation manual, Form I-MAPSIII&IV), be sure that all of the above preparations have been made. IMPORTANT: Verify
that the unit will be placed in the correct airflow orientation to mate properly with the discharge and return air openings.