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4.7
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.
4.8 Minimum flow rate
Due to the risk of overheating, the pumps should not be used at flows below 10 % of the rated
flow of one pump.
The minimum flow is 10% of the rated flow.
The pumps must not run against a closed discharge
valve.
4.9 Start/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.
4.10 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 accord-
ingly to ensure optimum operation.
Measure the precharge pressure while the system is
pressureless.
We recommend to use nitrogen gas for precharging.
5 Installation
The system must be installed and connected in compliance with local regulations
The system must be set up carefully and properly in order to ensure that it oper-
ates without faults.
Biral is not liable for any errors which may occur during set-up or for any conse-
quences which may result from not complying with safety instructions and legal
regulations, in the event that the system was not set up and commissioned by
Biral.
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