Starting Up The Booster System; Shaft Seal Run-In; Control Functions; Constant Pressure - Grundfos CMBE Montage- Und Betriebsanleitung

6.4 Starting up the booster system

1. Open all isolating valves.
2. Make sure that the water supply is sufficient on
the inlet side of the pump.
Venting may be necessary. This is
done by carefully unscrewing the
priming plug and letting out the air
trapped inside the pump.
3. Switch on the power.
4. Open some water taps so that one or both pumps
start. If they do not start, press the Start/Stop
button on both pumps.
5. Let the booster system run for 30 seconds to let
all remaining air out of the system.
6. The pumps are factory set, so the booster system
pressure will stabilise at factory setpoint and
Grundfos Eye will show a steady green light.
7. If the pressure is not stabilised, the booster
system will stop and restart. If the booster system
stops and restarts more than five times, turn
off both pumps by pressing their Start/Stop
button. Prime the pumps again. Start the system
by pressing the Start/Stop button on both pumps.
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 accordingly.
9. The booster system is now in automatic mode and
ready for operation.
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6.5 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.

7. Control functions

7.1 Constant pressure

The integrated speed controller keeps a constant
pressure in the pipe system. A pressure sensor
monitors changes in the water consumption and
signals to the speed controller to adjust the motor
speed up or down.

7.2 Dry-running protection

Dry-running protection automatically stops the pump
in case of dry running to prevent damage to the
pump.
To build up pressure, the motor will run at maximum
speed. When the motor runs at maximum speed, the
power consumption will be measured and compared
to the expected values for power consumption when
the pump is filled with water. In case the measured
value is below the expected value, the pump will stop
with dry-running alarm.
In case of a dry-running alarm, the pump will do the
following:
1. The pump stops.
2. The pump will restart 5 times every 10 seconds. If
the measured power consumption is still below
the expected value, the pump will stop.
3. After 5 minutes, the pump will try to restart again.
4. When water returns, you can either reset the
pump manually or wait for the pump to
automatically restart after 5 minutes.