Reznor RPBL Unit Installation Manual - Manual (Page 28)

Form I-SSCBL/RPBL, Page 28
7 8
1 2 3 4 5 6
1) Damper Motor
2) Return Air Damper
3) Potentiometer
4) Potentiometer
5) Mixed Air Controller
6) Warmup Control
7) Outside Air Damper
8) Damper Motor
Transformer
FIGURE 30A - Control
Locations for 100%
Outside Air and 100%
Return Air Damper
Options
6.3.3 Optional Dampers and Controls - RPBL and SSCBL
Damper controls are identified on the wiring diagram as AR Options.
The illustration in
FIGURE 30A is intended to show location only of various air con-
trol accessories and does not represent suggested combinations of accessories. The
illustration does not accurately depict the blower cabinet; control locations are approxi-
mately correct.
6.0 Mechanical
(cont'd)
6.3 Unit Inlet Air
(cont'd)
FIGURE 30B - Location of
Controls for 30% Outside Air
Hood and Damper Options
(AR6 or AR7)
Furnace
Section
(Outdoor
only)
Blower
Blower Cabinet
30% Outside
Air Damper
30% Outside
Air Hood
Damper Motor
Return Air
NOTE: See Paragraph 6.3.2.
Outside Air
Damper CLOSED
Return Air Damper OPEN
Rod for Outside
Air Damper
Set Screw
Outside
Air
Damper
Arm
Return
Air
Damper
Arm
Rod for Return
Air Damper
Damper
Motor
FIGURE 30C - Example of Outside Air
and Return Air Damper Linkage
Inlet Air Damper Linkage -- When units are
equipped with dampers, the dampers are
closed during shipment. When there are both
return air and outside air dampers, the return
damper linkage must be adjusted prior to
use.
1. Loosen the set screw on the return air
damper rod at the damper arm.
2. Manually open the return air dampers.
While the dampers are opening, the
damper rod and arm will automatically
move to their correct positions.
3. Tighten the set screw.
Pressure Null Switch
(Used to control
Outside Air Dampers
in Option AR23)
The pressure null switch used in Option AR23 is a Dwyer #1640-0 with a range of .01-
.20" w.c. It is shipped separately for field installation. Refer to the following paragraphs
and the manufacturer's installation instructions included with the switch.
Description and Application - The pressure null switch is a diaphragm operated dif-
ferential pressure switch used in makeup air applications to control building pressure.