Honeywell C645A-E - Manual (Page 6)

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
ᕡ Remove cover.
ᕢ Loosen scaleplate stop locking screw about 1/2 turn
counterclockwise with the 23466 Adjusting
Wrench.
ᕣ
Move scaleplate stop until bottom edge is aligned with
desired maximum setting.
ᕤ
Tighten scaleplate stop locking screw clockwise .
ᕥ 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