60-2159—8
6
C645A-E PRESSURE SWITCHES
SETTINGS AND ADJUSTMENTS
Pressure Setpoint Adjustment
Tables 2 through 4 give the pressure and switching for each
setpoint. To adjust the pressure setting, turn the setpoint
adjustment screw (Fig. 3 and 4) clockwise to increase
the pressure setting and counterclockwise to decrease
the pressure setting.
Table 2. C645A,D,E control points.
Setpoint
Switching
Pressure
in. of Water
Pressure
kPa
3
a
R-W makes
3
0.8
R-B makes
2
0.5
9
b
R-W makes
9
2.2
15
b
R-W makes
15
3.7
21
c
R-W makes
21
5.2
R-B makes
18
4.5
35
d
R-W makes
35
8.7
R-B makes
31
7.7
a
Nominal differential—1 in. of water (0.2 kPa).
b
Differential between 1 and 3 in. of water (0.2 and 0.7 kPa).
c
Maximum differential—3 in. of water (0.7 kPa).
d
Maximum differential—4 in. of water (1.0 kPa).
Table 3. C645B control points.
Setpoint
Switching
Pressure
in. of Water
Pressure
kPa
3
a
R-W makes
3
0.8
R-B makes
2
0.5
9
b
R-W makes
9
2.2
15
b
R-W makes
15
3.7
21
c
R-W makes
21
5.2
R-B makes
18
4.5
35
d
R-W makes
35
8.7
R-B makes
31
7.7
45
e
R-W makes
45
11.2
R-B makes
39
9.8
a
Nominal differential—1 in. of water (0.2 kPa).
b
Differential between 1 and 3 in. of water (0.2 and 0.7 kPa).
c
Maximum differential—3 in. of water (0.7 kPa).
d
Maximum differential—4 in. of water (1.0 kPa).
e
Maximum differential—5.7 in of water (1.4 kPa).
a
Nominal differential—0.2 in. of water (0.05 kPa).
b
Differential between 0.2 and 0.8 in. of water (0.05 and
1.2 kPa).
c
Maximum differential—0.8 in. of water (0.2 kPa).
C645B1047 Scaleplate Stop Adjustment
The C645B1047 is the same as the C645B1013 except for a
scaleplate stop.
Specifications
Scaleplate Stop:
Limits maximum setting, factory-set at 5-1/4 in. of water
(1.31 kPa).
Scale Range:
3 to 21 in. of water (0.75 to 5.23 kPa).
Adjusting Wrench:
Part no. 23466 included with the C645B1047.
To Adjust Scaleplate Stop
���
Remove cover.
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Loosen scaleplate stop locking screw about 1/2 turn
counterclockwise with the 23466 Adjusting
Wrench.
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Move scaleplate stop until
bottom
edge is aligned with
desired maximum setting.
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Tighten scaleplate stop locking screw clockwise .
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Replace cover.
Table 4. C645C Control Points.
Setpoint
Switching
Pressure
in. of Water
Pressure
kPa
1
a
R-W makes
1
0.25
R-B makes
0.8
0.2
3
b
R-W makes
3
0.75
R-B makes
2.6
0.64
5
b
R-W makes
5
1.24
R-B makes
4.3
1.2
Top Scale
c
R-W makes
6
1.50
R-B makes
5.2
1.3
