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8. Adjust the required setpoint pressure by using
the Up or Down arrows on the operating
panel. Choose one of the pumps for the
setpoint setting. The pumps communicate, so
it makes no difference which pump you
use. Monitor the system pressure on the
pressure gauge
If you change the outlet pressure,
you must adjust the precharge
pressure in the diaphragm tank ac-
cordingly.
9. The system is now in automatic mode and
ready for operation.
5.6 Shaft seal run-in
The shaft seal faces are lubricated by the pumped
liquid. A slight leakage from the shaft seal of up to
10 ml per day or 8 to 10 drops per hour may
occur. Under normal conditions, the leaking liquid
will evaporate. As a result, no leakage will be
detected.
When the pump is started for the first time, or
when the shaft seal has been replaced, a certain
run-in period is required before the leakage is
reduced to an acceptable level. The time required
for this depends on the operating conditions, that
is, every time the operating conditions change, a
new run-in period will be started.
Leaking liquid will drain through the drain holes in
the motor flange.
Install the product in such a way that leakage
cannot cause undesirable collateral damage.
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6. Product introduction
6.1 Product description
Grundfos CMBE TWIN is suitable for clean water
supply and pressure boosting in domestic and
commercial applications. The system maintains a
constant pressure in the pipe system. The CMBE
TWIN system consists of two CMBE pumps that
operate in parallel. Each CMBE pump includes a
Grundfos integrated variable frequency drive
(VFD).
The two CMBE pumps are mounted on a common
base plate. Each CMBE pump is delivered
complete with 5-way fittings, non-return valves,
diaphragm tank, pressure sensor and pressure
gauge.
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5
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CMBE TWIN
Pos. Description
1
Diaphragm tank
2
Pressure sensor
5-way fitting with integrated non-return
3
valve
4
CME pump
5
Base plate
6
Pressure gauge
Inlet/outlet pipes with ball valves and un-
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ions
6.2 Intended use
This product has been evaluated for
use with clean water only. Only use the
product according to the specifications
stated in these installation and operat-
ing instructions.
The CMBE TWIN system keeps a constant
pressure in variable-demand systems and is
designed for pressure boosting of clean water in
domestic and commercial applications.
The CMBE TWIN system is typically used for
pressure boosting for larger applications in
apartment buildings, hospitals, hotels, schools,
and small industrial plants and businesses,
agriculture and irrigation.
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