Reznor CAUA Unit Installation Manual - Manual (Page 26)

Form I-CAUA, P/N 164771 R8, Page 26
6.3.2 Outside Air and
Return Air Mixing Box,
Option GA
6.0 Mechanical
(cont'd)
6.3 Inlet Air (cont'd)
6.3.1 Filter Cabinet, Option CW (cont'd)
The optional mixing box for the Reznor ® Model CAUA heater is designed to provide the
system with a supply air mixture of return air and outside air. Any percentage of out-
side air can be supplied to a standard unit as long as the air temperature entering the
blower is 35°F or above. Only a unit equipped with factory-installed makeup air Option
AD4 is permitted to operate with entering air below 35°F.
The mixing box is available in an assortment of configurations with a selection of actua-
tors and controls. All mixing boxes are completely assembled at the factory for field
attachment to the rear of a Model CAUA heater.
Follow the instructions packed with the mixing box to cut out the opening and attach
the mixing box. If the mixing box has dampers, follow the instructions for routing the
damper motor wires, and connect the wires according to the wiring diagram. If there
are both return air and outside air dampers, follow the directions to adjust the damper
linkage.
All mixing box inlet air openings have duct flanges for attachment of ductwork. Duct-
work must be attached to the outside air opening. Removable door panels provide for
filter access from either end of the cabinet. If the mixing box was ordered with optional
filters, it is shipped with the filters installed.
FIGURE 19D - Bottom Filter Cabinet
Option CW13 with 2" Disposable Filters
Option CW14 with 2" Pleated Filters
Option CW15 with 2" Permanent Filters
Option CW16 for Field-Supplied Filters
• Adds 18" (457mm) to height of the heater
• Shipped factory assembled for field installation
• "V" Filter Rack Arrangement
TABLE 19 - Sizes of Disposable, Permanent or Pleated
2" Filters for Options CW13, CW14, CW15, or CW16
Size CFM FPM Filters
150
1800 281 (6) 16 x 16
2400 375 (6) 16 x 16
3000 469 (6) 16 x 16
200
2400 375 (6) 16 x 16
3000 469 (6) 16 x 16
250
3000 313 (8) 16 x 16
4000 417 (8) 16 x 16
5000 521 (8) 16 x 16
300
3000 313 (8) 16 x 16
4000 417 (8) 16 x 16
5000 521 (8) 16 x 16
350
4300 448 (12) 16 x 16
5000 521 (12) 16 x 16
*6000 625 (12) 16 x 16
400
4300 448 (12) 16 x 16
5000 521 (12) 16 x 16
*6000 625 (12) 16 x 16
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.
Mixing Box
Configurations
by Option Code
Option Mixing Box 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