Reznor CAUA Option - Installation - Mixing Box Installation - Manual (Page 2)

Form I-CAUA-MB, P/N170640R2 Page 2
Installation
Instructions
Installation should be done by a qualified agency in accordance with the instructions
in this manual and in compliance with all codes and requirements of authorities hav-
ing jurisdiction. It is recommended that the heater be placed in its permanent location
before attaching the mixing box.
1. Cut Out Air Inlet Opening (See FIGURE 2.)
On the rear of the heater where the mixing box cabinet is going to be attached, find
four embosses in the metal panel. These embosses are corner indicators for the inlet
air opening. Using tin snips or aviation shears, carefully cut straight lines between the
corner marks until the opening is created.
CAUTION: The cut edges of the metal cabinet will be sharp.
2. Drill Holes in the Heater Rear Panel (See FIGURE 3.)
On the rear of the heater, drill the 1/8" holes as illustrated.
A
B
Typical
22-15/16”
(583mm)
10”
(254mm)
10”
(254mm)
3-1/16”
(78mm)
13/16” (21mm)
1/8” (3mm) C = Number of holes
1/8” (3mm)
Drill 6 holes,
3 on each
side spaced
as shown.
Rear of Heater
(Opening cut out in FIGURE 2)
FIGURE 3 - Reference
drawing for drilling 1/8"
holes in the REAR of a
Model CAUA heater when
installing an optional
mixing box
FIGURE 2 -
Dimensions of inlet
air opening to be cut
out on rear of heater
Heater Cabinet Rear Panel
16”
(406mm)
D 2-1/8” (54mm)
2-1/2” (64mm)
Corner indicators for
cutting inlet air opening.
Rear of Heater
CAUA
Size
150-
200
250-
400
A
inches 3 2-1/2
mm 76 64
B
inches 8 9
mm 203 229
C No. of
Holes
5 6
3. Select Return Air Location - Mixing Boxes with only Outside Air
Dampers (no dampers in return air opening) - Opts GA1, GA2, GA3
The mixing box was manufactured with an outside air opening with dampers in either
the top, rear, or bottom. There are two openings for return air allowing for a choice
of location. When shipped, one return air opening is left open and the other covered.
Size D
150/200 33" (838mm)
250/300/350/400 45" (1143mm)