Reznor RPBL Unit Installation Manual - Manual (Page 9)

Form I-SSCBL/RPBL, P/N 149159 R7, Page 9
FIGURE 6A - Mounting
Support Dimensions -
inches (mm)
A
B 4x4 Treated Lumber
Leave both
ends open
for ventilation.
If the rails are not placed directly on a surface, cross-supports should be placed under-
neath the rails at the ends of the unit and at all cabinet "joints" (between the blower
cabinet and the furnace section, between each furnace section, and between the fur-
nace and an optional downturn plenum cabinet). See FIGURE 6B. The field-supplied,
cross-support structure must be adequate for the weight of the unit. Cross-supports
should run the entire width of the unit, supporting the 4x4 wooden rails at all recom-
mended locations.
SSCBL
"A" "B"
Standard
Cabinet
w/Cooling Coil
Cabinet (Option
AU2 or AU3)
Width - All
Configurations
400 82-1/4 (2089) 150-1/4 (3816) 54-1/2 (1384)
500/
600
108-1/4 (2750) 176-1/4 (4477) 43-9/16 (1106)
700 108-1/4 (2750) 176-1/4 (4477) 49-1/16 (1246)
800 108-1/4 (2750) 176-1/4 (4477) 54-1/2 (1384)
1050 134-1/4 (3410) 202-1/4 (5137) 49-1/16 (1246)
1200 134-1/4 (3410) 158-1/4 (4020) 54-1/2 (1384)
Field-
Supplied
Duct
Blower
Cabinet
Duct
Furnace
Field-
Supplied
Duct
4x4 Treated
Lumber = Support Locations
Duct
Furnace
Duct
Furnace
FIGURE 6B - Cross
Support Locations
5.4 Mounting
Outdoor Model
RPBL
5.4.1 Rigging
Lifting holes are provided for rigging. Use spreader bars when lifting to prevent chains
or cables from damaging the unit. If the unit is being mounted on a roof curb, apply
caulking to the roof curb prior to lifting the unit to the roof and setting it on the curb. See
FIGURE 9A, page 11. If the system includes an outside air hood, a cooling coil cabinet,
or an evaporative cooling module, attach them after the system is in place.
5.4.2 Base
Construction
Curb Cap Base - A Model RPBL unit is equipped with a load-bearing curb cap which
forms an integral part of the unit. This curb cap is welded at all joints and has a "skirt"
which fits over a roof curb to provide a weatherproof installation. Holes are provided at
the curb cap corners for lifting the unit. These holes do not interfere with unit weather-
proofing. The curb cap is not designed to be placed directly on the roof surface.
The system may be mounted on an optional roof curb purchased with the unit, a field-
supplied roof curb, or field-supplied supports. If the system has a downturn plenum
and/or a bottom return air opening, a roof curb is recommended to provide a weather-
proof installation as well as more workable clearances for ductwork.
5.4.3 Mounting
Outdoor Models
on Field-Supplied
Supports (without a
roof curb) - Applies to
Model RPBL
Prior to installation, be sure
that the method of support is in agreement with all local building codes and is suited
to the climate. If considering this type of installation in snow areas, it is recommended
that the 4x4 wooden rails underneath the system be on cross-support structure at least
12" higher than the roof surface (see cross support locations in FIGURE 8, page 10).
Whether the supports are being mounted directly on the roof or being placed "up" on
additional structure, the horizontal length of the system should be supported by two
4x4 treated wooden rails. Cut the rails to the appropriate length (Dimension "A") in FIG-
URE 7. (NOTE: Although dimensions are included for units with a downturn plenum
cabinet, it is strongly recommended that a full roof curb be used on an installation with
a downturn plenum cabinet and/or a bottom return air duct.)
Space the 4x4 wooden rails (See "B" Dimension,
FIGURE 7) so that the curb cap
"skirt" will fit over the edge of the boards with the rails setting inside the horizontal
length of the curb cap.