Pipe Connection; Operating Conditions; Electrical Connection - Grundfos BMP series Montage- Und Betriebsanleitung

4.2 Liquid temperature
3°C to 50°C (37.4°F to 122°F) at maximum discharge pressure.
4.3 Ambient temperature
0°C to 50°C (32°F to 122°F).
5. Installation
The BMP pump can be used in both closed and open systems.
• The suction port is marked with an "I".
• The discharge port is marked with an "O".
5.1 Position of pump
Fig. 1 Position of pump
The pump must be installed on a solid foundation by means of the
bolt holes in the foot-mounted motor. It is recommended to use
vibration-absorbing machine feet.
Dimensional sketches and dimensions, see pages 127 and 128.
5.2 Installation examples
A B C
Fig. 2 System with one BMP pump
A B
C
C
C
E
Fig. 3 System with three BMP pumps and one frequency-
converter controlled BMPE pump
Key to the symbols in figures 2 and 3:
Pos. Description
Prefilter, maximum 10 microns (abs. β
A
B Low-pressure switch
C BMP pump
D Non-return valve
E Frequency-converter controlled BMPE pump
F Pressure relief valve (adjustable)
D
F
D
F
D
D
D
> 5000)
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6. Pipe connection

The BMP pump has a threaded connection on the suction and
discharge sides of the pump, see pages 127 and 128.
Note: BMP-R pumps with flows ranging from 5.1 to 10.2 m³/h are
fitted with clamp liners for Victaulic/PJE clamp couplings on the
suction and discharge sides.
Note: It is recommended to use flexible high-pressure hoses.
If the suction pipe connected to the pump suction port (I) is dis-
connected from the water supply, the pump will be emptied of
water. When the pump is to be started again, the starting proce-
dure in section 9. must be followed carefully.

7. Operating conditions

7.1 Inlet pressure
0 to 4 bar (1 bar abs. to 5 bar abs.).
It is recommended to install a low-pressure switch after the prefil-
ter. The low-pressure switch must switch off the electricity supply
to the pump if the inlet pressure falls outside the range from 0 to
4 bar.
7.2 Discharge pressure
To avoid any damage to the system, a pressure relief
valve must be fitted on the discharge side.
The pressure relief valve setting must not exceed the
maximum permissible discharge pressure by more
than 5%, see pump nameplate.

8. Electrical connection

The electrical connection must be carried out by a qualified elec-
trician in accordance with local regulations.
Before removing the terminal box cover and before
any removal/dismantling of the pump, make sure that
the electricity supply has been switched off.
The pump must be connected to an external mains
switch with a minimum contact gap of 3 mm in all
poles.
The operating voltage and frequency are marked on the motor
nameplate. Make sure that the motor is suitable for the electricity
supply on which it will be used.
The motor must be connected to a motor starter.
Carry out the electrical connection as shown in the diagram
inside the terminal box cover.
8.1 Frequency converter operation
Motors supplied by Grundfos:
All three-phase motors supplied by Grundfos can be connected to
a frequency converter. The frequency converter must be set to
operation with a constant torque.
Dependent on the frequency converter type, this may cause
increased acoustic noise from the motor. Furthermore, it may also
cause the motor to be exposed to detrimental voltage peaks.
Note: Grundfos motors type MG 90 (1.5 kW, 2-pole), for supply
voltages up to and including 440 V (see motor nameplate), must
be protected against voltage peaks higher than 650 V (peak
value) between the supply terminals.
It is recommended to protect all other motors against voltage
peaks higher than 850 V.
The above disturbances, i.e. both increased acoustic noise and
detrimental voltage peaks, can be eliminated by fitting an LC filter
between the frequency converter and the motor.
For further details, please contact your frequency converter or
motor supplier.
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