Reznor GA1 Installation Manual

OUTSIDE AIR/RETURN AIR MIXING BOX INSTALLATION FOR
GAS-FIRED INDOOR HEATER
OPTION GA1, GA2, GA3, GA4, GA5, GA6, GA7, GA8, OR GA9 FOR MODEL CAUA
NOTE: Installation should be done by a qualified agency in accordance with these instructions
and in compliance with all codes and requirements of authorities having jurisdiction.
• The optional mixing box for the model CAUA heater is designed to provide the system with a supply air mixture
of return air and outside air. Application with a mixed air temperature <35°F (<2°C) requires that the CAUA unit
be ordered with option AD4.
• The mixing box is available in an assortment of configurations with a selection of actuators and controls for both
heating and cooling (requires optional cased cooling coil) modes. The mixing box is factory-assembled for field-
installation on the rear of the heater.
• All mixing box inlet air openings have duct flanges for connecting ductwork.
• Refer to the installation manual provided with the heater for important safety information and for instructions to
install the heater. The heater should be in its final installation location before installing the mixing box.

Filters

If the box was ordered with filters (option AW9 or AW11), it is shipped with the filters installed. Removable door
panels provide for filter access from either end of the cabinet. Replacement filters are listed in
Type
Pleated disposable
Pleated permanent (aluminum)

Airflow Configurations

The mixing box is installed on the rear of the heater and is available in a variety of airflow configurations (refer to
Table 2).
Option
GA1
GA2
GA3
GA4
GA5
GA6
GA7
GA8
GA9

GENERAL INFORMATION

Table 1. Replacement Filters
2 × 16 × 16
2 × 16 × 20
2 × 16 × 16
2 × 16 × 20
Table 2. Airflow Configurations
Opening for Outside Air
Location on Mixing Box
Top
Rear
Bottom
Bottom
Bottom
Rear
Rear
Top
Top
Revision: CAUA-GA1-GA9 (04-22) 170640-A
Supersedes: I-CAUA-MB (04-15) PN170640R2
150, 200
Size PN (Quantity)
104109 (2)
104110 (2)
104103 (2)
101620 (2)
Dampers Included?
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Unit Size
Size
2 × 16 × 16
Opening for Return Air
Location on Mixing Box
Bottom or Rear
Top or Bottom
Top or Rear
Rear
Top
Top
Bottom
Rear
Bottom
Table 1.
250–400
PN (Quantity)
104109 (6)
104103 (6)
Dampers Included?
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes