GRUNDFOS
INSTRUCTIONS
www.grundfos.co.uk
Page 17 of 35
9.1
Pressure switch settings
The
FireSAFE
primary pressure switch is factory set according to the following table.
The factory setting may not be ideal for the site application, especially if a significant suction
pressure pre-exists. The operating range of the pressure sensor is -0.2 bar to 8 bar.
The factory setting can be adjusted as follows.
Figure 8 Pressure switch
Removing the pressure switch case exposes the user to electrical voltages
Model
Closed Valve Head
(
m
/ bar)
Pressure Switch setting (OFF)
(bar)
Differential setting (ON)
(bar)
CM3-3
27.3 /
2.67
2.5
1.0
CM3-5
45.9 /
4.50
4.0
1.0
CM5-3
27.9 /
2.74
2.5
1.0
CM5-4
37.3 /
3.66
3.0
1.0
CM10-2
31.0 /
3.04
2.5
1.0
CM10-3
46.6 /
4.56
4.0
1.0
The pressure switch is found inside of the cabinet, on top of
the pump, requiring the removal of the front cover, on top
of the pump.
Adjustment is made with a cross head screw driver.
Position 1
on the drawing adjusts the set point (OFF). Coarse
adjustment can be made against the scale on the front of
the device.
Position 2
on the drawing adjusts the differential (Start).
Coarse adjustment can be made against the scale on the
front of the device.
For fine adjustment, adjust against the scale on the pressure
gauge.
Access into the pressure switch is not required.
Do not remove the pressure switch case.
The secondary pressure switch is factory set at 1 Bar and is
provided as a back up to the Primary Pressure switch.
No adjustment should be necessary. However adjustment
can be made via the screw fitting in the rear of the switch.
