English (GB)
6
Example
This means that each pump can operate at a suction lift of
maximum 2.8 metres head.
Pressure calculated in bar: 2.8 x 0.0981 equal to 0.27.
Pressure calculated in kPa: 2.8 x 9.81 equal to 27.4.
7.7 Maximum inlet pressure
The maximum inlet pressure must not exceed 8 bar. However, the
actual inlet pressure plus pressure when the pump is operating
against a closed valve must always be lower than the maximum
operating pressure.
7.8 Minimum flow rate
Due to the risk of overheating, the pumps should not be used at
flow rates below 10 % of the rated flow rate of one pump.
7.9 Start and stop
The system must not be started and stopped via the power supply
more than four times per hour.
When the system is switched on via the power supply, it will start
after approx. 5 seconds.
7.10 Diaphragm tank
The diaphragm tank precharge pressure must be set to 0.7 x
setpoint.
If the setpoint is changed, the diaphragm tank precharge
pressure should be changed accordingly to ensure optimum
operation.
We recommend that you use nitrogen gas for precharging.
8. Installation
8.1 Location
Observe the following to ensure adequate cooling of motor and
electronics:
• Position Hydro Multi-E in such a way that adequate cooling is
ensured.
• Keep motor cooling fins and fan blades clean.
Hydro Multi-E is not suitable for outdoor installation.
The booster system must have a 1-metre clearance in front and
on the two sides.
8.2 Mechanical installation
Arrows on the pump base show the direction of flow of water
through the pump.
The pipes connected to the booster system must be of adequate
size. Fit expansion joints in the inlet and outlet pipes to avoid
resonance. See fig.
Connect the pipes to the manifolds of the booster system.
The manifold comes with a screw cap fitted to one end. If this end
is to be used, remove the screw cap, apply sealing compound to
the other end of the manifold, and fit the screw. Fit a blanking
flange with gasket on flanged manifolds.
Tighten up the booster system prior to startup.
If booster systems are installed in blocks of flats or the first
consumer on the line is close to the booster system, we
recommend that you fit pipe hangers on the inlet and outlet pipes
to prevent vibration being transmitted through the pipes. See fig.
.
Position the booster system on a plane and solid surface, for
example a concrete floor or foundation. If the booster system is
not fitted with vibration dampers, it must be bolted to the floor or
the foundation.
Fasten the pipes to parts of the building to ensure that they
cannot move or be twisted.
Fig. 5
Installation example with expansion joints and pipe
supports
The expansion joints and pipe supports shown in fig.
are not
included in the standard booster system.
pb
= 1 bar.
Pump type
= CRE 15, 50 Hz.
Flow rate
= 15 m
3
/h
NPSH
(from page
) = 1.2 metres head.
Hf
= 3.0 metres head.
Liquid
temperature
= +60 °C.
Hv
(from page
) = 2.1 metres head.
H
= pb x 10.2 - NPSH - Hf - Hv - Hs [metres head].
H
= 1 x 10.2 - 1.2 - 3.0 - 2.1 - 0.5 equal to 2.8
metres head.
The pumps must not run against a closed outlet
valve.
Measure the precharge pressure while the system is
pressureless.
T
M
00
77
48
19
96
Pos.
Description
1
Expansion joint
2
Pipe supports
2
2
1
1
2
