Form RZ-NA I-SCE, Page 32
FIGURE 32A - Filter
Arrangement
FIGURE 32B - Filter Arrangement FIGURE 32C - Filter Arrangement
Size 400
Sizes 200-350
Sizes
125-
175
27A. Optional Dirty Filter
Switch
The optional dirty filter pressure switch is used to provide warning to the user by energizing
an indicator light on an optional remote console. The light indicates that the filters are in
need of cleaning or changing. The adjustable, single-pole/normally open differential switch
closes when an increase in pressure differential above the setpoint, is sensed across the
filter bank.
This switch is located in the furnace section. After the unit is started, before continuous
operation, the dirty filter switch must be set.
27. Optional Filter
Rack and Filters
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
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 open-
ing, the damper rod and arm will automatically move to their correct
positions.
3.
Tighten the set screw.
FIGURE 31 - Control Locations for Air Inlet/Damper Options
(1)
Outside Air Damper
(2)
Return Air Damper
(3)
Damper Motor
(4)
Potentiometer
NOTE: The illustration is intended to show location
only of various air control accessories and does not
represent suggested combinations of accessories.
OPTIONAL EQUIPMENT
26. Optional Dampers and Controls (See Wiring Diagram supplied with unit)
(5)
Potentiometer
(6)
Mixed Air Controller
(7)
Warmup Control
(8)
Remote Potentiometer
Filter racks and filters are factory installed optional equipment on indoor systems. 1" or 2"
disposable, pleated disposable, or permanent filters are available.
Heater
Filters
Metal Fillers
FIGURE Reference for
Size
A
B
C
D
E
F1
F2
Qty of Filters and Fillers
125
20x20 20x20
--
--
--
--
--
32A
150, 175
20x25 20x25
--
--
--
13/16 13/16
200, 225
16x25 16x20 16x25 16x20
--
--
--
250, 300
20x25 20x20 20x25 20x20
--
--
--
32B
350
20x25 20x25 20x25 20x20
--
4-13/16
--
400
16x25 20x25 16x25 20x25 16x25 2-5/8 1-1/16
32C
Filter
and
Filler
Sizes
