Reznor RECC Unit Installation Manual - Manual (Page 27)

Form I-MAPSIII&IV, P/N 222917R9, Page 27
3. Discharge Duct Supports - Position the two discharge duct side
supports as shown in FIGURES 12A and 12D, and attach to cross
supports as shown in STEP 12 in FIGURE 12B.
4. Return Air Duct Supports - Position the two return air side supports and
the end support as shown in FIGURES 12A and 12D. Follow STEP 7 in
FIGURE 12B to attach.
5. 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).
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 curb to
the roof deck before installing flashing.
7. Install field-supplied flashing. See FIGURE 12C.
8. If the unit has return air and/or down discharge, insert ductwork into the
duct openings. See ductwork sizes in FIGURE 12E.
9. Before placing the unit on the curb:
□
If ductwork is being installed from the top, slide the ductwork down into the discharge and return air openings. See
dimensions in FIGURE 12E. Ductwork should be sized slightly smaller with a minimum 3/4" duct flange that can be
attached on 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 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.
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
FIGURE 12C - Cross Section
of Roof Curb Installation
IMPORTANT NOTES: Area
enclosed by roof curb must
comply with clearance to
combustible materials. If
the roof is constructed of
combustible materials, area
within the roof curb must be
ventilated, left open, or covered
with non-combustible material
which has an "R" value of at
least 5. If area within curb is left
open, higher radiated sound
levels may result.
Roof Curb Dimensions
and Weight by Model
and Size
FIGURE 12D -
Dimensions - MAP ® SIII
Cabinet D, Option CJ3
Roof Curb (Curb height
is 16" / 406mm.)
Return
Air Duct Opening
for inserting ductwork with flange down from the roof.
Discharge
Duct
Opening
for inserting
ductwork
with flange
down from
the roof
X - Outside of Curb Rail
Y - Inside of Curb Rail
Top width of mounting rails is 1-5/8” (41mm). Always apply caulking to all mounting surfaces (curb rails, supports,
and duct dividers) before placing unit.
Top View
of Roof Curb
Unit Airflow
5-1/2” (140mm) 1-5/8”
(41mm)
1-5/8”
(41mm)
1-5/8”
(41mm)
1-5/8”
(41mm)
*48”
(1219mm)
*10-1
1/16”
(271mm)
*30-1
1/16”
(779mm)
*Z
*Use these dimensions for assembling the roof curb; follow the instructions on pages 26-27.
DO NOT USE these dimensions for sizing ductwork; see FIGURE 12E on page 28.
2-39/64”
(66mm)
4-3/8” (111mm)
*26-7/16” (672mm)
*72-5/16”
(1837mm)
92-1/4”
(2343mm)
89”
(2261mm)
2-piece cross support (with splice bracket
outside of the duct opening)
2-piece cross support (with splice bracket
outside of the duct opening)
2-piece cross support (with splice bracket)
2-piece cross support (with splice bracket outside of the duct opening)
Cabinet D MAPS ® III Models
and Cooling Sizes
with Gas Heat
Section
with Electric
Heat Section
Illustration Codes - FIGURE 12D Approx
Curb Wt X Y Z
Dimensions - inches lbs
RCB 360, 480, 600, 720
None
None 200-7/16 197-3/16 87-9/16 710
RECB 360, 480, 600, 720 120, 180 200-7/16 197-3/16 87-9/16 710
RDCB 360, 480, 600, 720
500, 600, 700, 800
None
200-7/16 197-3/16 87-9/16 710
1000, 1200, 1400, 1600 232-7/8 229-5/8 120 740
RDB 418, 444, 538, 564, 602, 658,
684, 722, 804, 842
None
None 200-7/16 197-3/16 87-9/16 710
REDB 418, 444, 538, 564, 602, 658,
684, 722, 804, 842
120, 180 200-7/16 197-3/16 87-9/16 710
RDDB 418, 444, 538, 564, 602, 658,
684, 722, 804, 842
500, 600, 700, 800
None
200-7/16 197-3/16 87-9/16 710
1000, 1200, 1400, 1600 232-7/8 229-5/8 120 740
Dimensions - mm kg
RCB 360, 480, 600, 720
None
None 5091 5009 2224 322
RECB 360, 480, 600, 720 120, 180 5091 5009 2224 322
RDCB 360, 480, 600, 720
500, 600, 700, 800
None
5091 5009 2224 322
1000, 1200, 1400, 1600 5915 5833 3048 322
RDB 418, 444, 538, 564, 602, 658,
684, 722, 804, 842
None
None 5091 5009 2224 322
REDB 418, 444, 538, 564, 602, 658,
684, 722, 804, 842
120, 180 5091 5009 2224 322
RDDB 418, 444, 538, 564, 602, 658,
684, 722, 804, 842
500, 600, 700, 800
None
5091 5009 2224 322
1000, 1200, 1400, 1600 5915 5833 3048 336