Reznor RBL (Cabinet Blower) Unit Installation Manual - Manual (Page 8)

Form I-RBL, P/N163219R2, Page 8
5.1.4 Optional Evaporative Cooling Module
Evaporative cooling provides comfort cooling at low initial equipment and installation
costs and low operating and maintenance costs. Direct evaporative cooling works
solely on the principle that water in direct contact with a moving airstream will eventu-
ally evaporate if the droplets have long enough exposure. This evaporative cooling
module uses wetted rigid cellulose or rigid glass fiber media to retain water in order to
allow time for evaporation.
The evaporative cooling module for a Model RBL cabinet is factory assembled but
is not attached to the blower cabinet at the factory. It is shipped separately for field
attachment to the system blower cabinet. The base support for the cooling module and
the transitional ductwork between the cooling module and the blower cabinet inlet are
shipped separately and must be field assembled and installed. Installation instructions
including water and electrical connections are included with the evaporative cooling
module package.
Blower
Cabinet
Cooling
Module
and Base
FIGURE 13 - Optional
Evaporative Cooling
Module for Model RBL
Blower Cabinet is
factory-assembled for
field attachment to the
blower cabinet (duct
and base are shipped
knocked down for field
assembly)
NOTE: Evaporative cooling
module installation and
maintenance information is
in Form I-OPT-EC shipped
with the evaporative
cooling module. Follow
the instructions to install,
become familiar with the
maintenance requirements,
and keep Form I-OPT-EC
for future reference.
5.0 Mechanical
(cont'd)
5.1 Unit Inlet Air
(cont'd)
5.1.3 Optional Dampers and Damper Controls (cont'd)
point is set by adjusting the span of the null by turning the span adjustment screw.
The span range is .01 to .03" w.c.
5. Refer to the wiring diagram to make electrical connections.
5.2 Duct
Connections
NOTES: For systems with
a downturn cabinet, the
type of duct installation to
be used depends in part on
the type of construction of
the roof (whether wood joist,
steel bar joist, steel truss,
precast concrete) and the
ceiling (whether hung, flush,
etc.).
For cabinets without a downturn, a minimum horizontal duct run of 24 inches (610mm)
is recommended before turns or branches are made in the duct system, to reduce
losses at the furnace outlet.
Make certain return air ductwork and grills have a free area equal to the return duct
size connection. See Paragraph 3.0 for duct opening dimensions.
Suggestions for Installing Ducts
A. The type of duct installation to be used depends in part on the type of construction
of the roof (whether wood joist, steel bar joist, steel truss, precast concrete) and
the ceiling (whether hung, flush, etc.). Duct connections should be mechanical.
B. Rectangular duct should be constructed of not lighter than No. 26 U.S. gauge gal-
vanized iron or No. 24 B & S gauge aluminum.
C. All duct sections 24 inches (610mm) or wider, and over 48 inches (1219mm)
in length, should be cross broken on top and bottom and should have standing
seams or angle-iron braces. Joints should be S and drive strip, or locked.
Transition Duct
Included in the cooling module installation booklet is a preparation checklist. All items
in that checklist should be consulted prior to beginning installation of the optional evap-
orative cooling module. Four of those items are listed below.
 Make certain the roof or platform is capable of handling the additional load of a full
cooling module reservoir.
Module with 12" rigid cellulose media (Option AS4) weighs 431 lbs.
Module with 12" rigid glass fiber media (Option AS6) weighs 514 lbs.
 Make certain the surface is level and free of debris where cooling module will be
mounted.
 Do not mount directly on soft tar roofs where the legs could sink and tilt the cooler.
Provide a weather-resistant, solid wood or metal base under cooling module sup-
port legs.
 Make certain that there will be adequate clearance between the bottom of the res-
ervoir and the roof (or platform) to allow for drain and overflow pipe connections.