Thomas & Betts RGM 405 - Manual (Page 21)

Mfg No. 164771, Page 21
20. Discharge Plenum
(Sizes 350
and 400 only)
The optional discharge plenum is designed to be used with a screened
mounting base (Paragraph 21) to create a "packaged stand-alone" upflow
system that circulates building air. However, the discharge plenum
may also be used in place of ductwork in applications that do not have
an optional mounting base.
The discharge plenum is available in three types. Option CD60 and
CD61 are for a heater without a cooling coil; Option CD60 is designed
for an open area and Option CD61 includes field-installed blockoff
plates to block off one or two sides. Option CD62 can only be ordered
with a cooling coil and includes blockoff plates to provide higher veloc-
ity required for cooling.
A discharge plenum adds 49-15/16" (1268mm) to the height of the
heater. (If installing Option CD62, this height includes the cooling
coil.)
Figure 23 - Dimensions of Optional
Mixing Box - inches (mm)
150-200 250-400
A 38 (965) 50 (1270)
B 22-3/4 (578) 36-1/2 (927)
C 7-5/8 (194) 6-3/4 (171)
Note: Damper frame fits in the inlet opening.
Figure 22 -
Optional
Outside Air
and Return
Air Mixing
Box
Configurations/Accessories
Before installing, check to be sure that the configuration of the mixing
box matches the order and that any accessories ordered are part of the
cabinet. Factory-installed optional accessories could include a damper
motor, potentiometer, return air controller, mixed air controller, and/or
filters. NOTE: If the potentiometer is to be field-installed, it is shipped
in a separate carton.
Option Configuration
GA1 Top Outside Air Opening with Dampers/
Rear or Bottom Return Air Opening without Dampers
GA2 Rear Outside Air Opening with Dampers/
Top or Bottom Return Air Opening without Dampers
GA3 Bottom Outside Air Opening with Dampers/
Top or Rear Return Air Opening without Dampers
GA4 Bottom Outside Air Opening with Dampers/
Rear Return Air Opening with Dampers
GA5 Bottom Outside Air Opening with Dampers/
Top Return Air Opening with Dampers
GA6 Rear Outside Air Opening with Dampers/
Top Return Air Opening with Dampers
GA7 Rear Outside Air Opening with Dampers/
Bottom Return Air Opening with Dampers
GA8 Top Outside Air Opening with Dampers/
Rear Return Air Opening with Dampers
GA9 Top Outside Air Opening with Dampers/
Bottom Return Air Opening with Dampers
21. Inlet Base
(Sizes 350 and 400 only)
The optional mounting base is designed to support a Model CAUA 350
or 400 heater while providing an inlet for return air. The mounting base
is designed to be used with an optional discharge plenum (Paragraph 20)
creating a "packaged stand-alone" heating or heating/cooling upflow
system which can be used in an air turnover application.
However, if the installation requires it, the mounting base may also be
used with discharge ductwork.
The mounting base has guarded openings on all four sides and is avail-
able with optional 1" flat disposable, 1" permanent aluminum, or 1"
pleated disposable filters.
The base is designed for a fairly open area and must have at least three
of the four sides open.
The base adds 36-1/2" (927mm) to the overall height.