English (GB)
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7. Starting up the product
7.1 Supplement to quick guide
These instructions are a supplement to the quick
guide for CMBE and CMBE TWIN.
http://net.grundfos.com/qr/i/98388184
7.2 Priming and venting the product
1. Close the isolating valve on the outlet side.
2. Open the isolating valve on the inlet side.
3. Remove the priming plug.
4. Fill the pump with water until a steady stream of
liquid runs out of the filling hole.
5. Let all air out of the system.
6. Fit and tighten the priming plug.
7.3 Adjusting the diaphragm tank pressure
1. Check the precharge pressure in the diaphragm
tank. The correct precharge pressure is 0.7 times
the required outlet pressure (setpoint).
2. Adjust the precharge pressure. Always use
nitrogen gas to refill the tanks.
7.4 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.
8. Control functions
8.1 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.
1. The pump stops due to dry-running alarm.
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.
WARNING
Hot liquid
Death or serious personal injury
- If the temperature is higher than 50 °C,
use gloves and glasses when venting
the pump to avoid risk of scalding.
WARNING
Biological hazard
Death or serious personal injury
- Flush the pump with clean water before
first use.
Do not start the pump until it has been
filled with liquid.
QR98388184
Measure the precharge pressure while the
system is pressureless.
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