Reznor RPB Unit Installation Manual - Manual (Page 13)

Form I-RPB, P/N 131782 R12, Page 13
6.3.2 Filter Rack and
Filters, Option AW
Filter rack and filters are factory installed optional equipment. Refer to FIGURE 10, for
filter arrangements.
Tested in accordance with ASHRAE 52-76 Test Standard, the filters provided have the
specifications shown in the table below.
Size, quantity, and pressure drops of filters for outdoor models shown below.
FIGURE 10 - Filter
Arrangements
Shaded areas are filter
blockoff plates.
Filter
Code
Filter
Size
A 16 x 20
B 20 x 20
C 16 x 25
D 20 x 25
E 25 x 25
D
E
Size 125
25” (635m
m)
20”
(508mm)
Sizes 150-175
A
A
C
C
25” (635m
m)
20”
(508mm)
Sizes 200-225
A B
C
D
25” (635m
m)
20”
(508mm)
Sizes 250-300
B D
D
E
25” (635m
m)
20”
(508mm)
20”
(508mm)
A
B
C
D
25” (635m
m)
Size 350
D
D
D
C
C
Size 400
25” (635m
m)
20”
(508mm)
B
D
Average Efficiency and Arrestance by Filter Type
Type of Filter Average Efficiency Average Arrestance
Disposable 2" Less than 20% 80%
Permanent 2" Less than 20% 64% to 67%
Pleated Disposable 2" 30% to 35% 90% to 93%
Filter Pressure Drops (" w.c.)
RPB
Size
Qty & Size
of Filters
CFM Disposable Permanent Pleated
125
(1) 20x25;
(1) 25x25
575 0.00 0.01 0.01
1000 0.01 0.03 0.04
1500 0.02 0.06 0.08
2000 0.02 0.11 0.15
2500 0.03 0.17 0.23
3000 N/A 0.24 0.33
3500 N/A 0.34 0.45
4000 N/A 0.43 N/A
150,
175
(2) 16x20;
(2) 16x25
1175 0.01 0.03 0.03
1500 0.01 0.06 0.05
2000 0.02 0.08 0.09
2500 0.03 0.14 0.14
3000 0.04 0.20 0.23
3500 0.05 0.28 0.27
4000 0.07 0.36 0.36
4500 N/A 0.45 0.45
5000 N/A 0.54 0.56
200,
225
(1) 16x20;
(1) 16x25;
(1) 20x20;
(1) 20x25
1550 0.01 0.04 0.04
2000 0.01 0.07 0.07
2500 0.02 0.11 0.11
3000 0.03 0.16 0.16
3500 0.04 0.22 0.21
4000 0.05 0.28 0.27
4500 0.06 0.36 0.35
5000 N/A 0.44 0.43
5400 N/A 0.52 0.50
250,
300
(1) 20x20;
(3) 20x25
1950 0.02 0.05 0.05
2500 0.03 0.08 0.08
3000 0.04 0.12 0.11
3500 0.05 0.16 0.15
4000 0.07 0.21 0.20
4500 0.09 0.26 0.25
5000 0.11 0.32 0.31
5500 N/A 0.39 0.37
6000 N/A 0.46 0.44
6500 N/A 0.54 0.52
350
(2) 16x25;
(3) 20x25
2750 0.03 0.08 0.08
3500 0.04 0.13 0.13
4000 0.06 0.17 0.17
4500 0.07 0.21 0.22
5000 0.09 0.26 0.27
5500 0.10 0.32 0.33
6000 0.12 0.38 0.39
6500 N/A 0.44 0.46
7000 N/A 0.51 0.53
3100 0.04 0.08 0.08
400
(1) 16x20;
(1) 16x25;
(2) 20x20;
(2) 20x25
3500 0.06 0.11 0.11
4000 0.07 0.14 0.14
4500 0.09 0.18 0.18
5000 0.12 0.22 0.22
5500 0.14 0.27 0.27
6000 0.17 0.32 0.32
6500 0.20 0.38 0.37
7000 0.23 0.44 0.43
7400 N/A 0.49 0.48
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. See page 28, FIGURE 29
Item 17. After the unit is started, before continuous operation, the dirty filter
switch must be set.
Instructions for Setting Switch
With clean filters in place, blower doors closed, and blower in operation,
decrease the pressure setting by adjusting the setscrew on the switch
clockwise until the filter light is energized or the screw is bottomed out.
At that point, adjust the set screw three full turns counterclockwise or until
the screw is top-ended. At that setpoint the filter light will be activated at
approximately 50% filter blockage.
FIGURE 11 - Dirty Filter Switch
Setscrew (on front of switch)
must be manually adjusted
after the system is in operation.
Negative pressure connection is toward the "front or top"
of the switch (senses blower side of filters)
Positive pressure connection is
toward the "back or bottom" of the
switch (senses air inlet side of filters)