Grundfos CMBE User Manual

7.3 Inlet pressure protection
Some models of the pump are fitted with an
adjustable pressure switch as inlet pressure
protection. The pressure switch is fitted to the inlet
manifold.
The inlet pressure setting may have to be adjusted
according to local regulations.
1
TM084065
Pos. Description
1 Pressure switch valve
Before starting up the system, make sure
that the pressure switch valve is open.
If the inlet pressure is below the lower
switching point, the system cannot start.
If the pressure switch has stopped the
system during operation due to the inlet
pressure being too low, the inlet pressure
must increase to a pressure that is higher
than the setting of the upper switching
point before the system can restart.
If necessary, adjust the lower switching point by
turning screw A and adjust the upper switching point
to a value higher than the lower switching point by
turning screw B.See the figure below.
Do not set the lower switching point to a
value below the minimum inlet pressure.
A B
TM058436
Adjustment of switching points
Pos. Description
A Low-pressure switching point
B High-pressure switching point
17
English (GB)

Grundfos CMBE Specifications

General

Flow Rate	Up to 6 m³/h
Material	Stainless Steel
Motor Type	Permanent magnet motor
Liquid Temperature	0°C to +60°C
Maximum Operating Pressure	10 bar
Enclosure Class	IP55
Frequency	50 / 60 Hz
Pump Type	Centrifugal pump
Power Supply	1 x 200-240 V
Control	Integrated Frequency Converter
Max Head	60 m
Seal Type	Mechanical seal
Motor Power	0.3 - 1.5 kW