Johnson Pump SPX Flow CombiBlocHorti Series, Instruction Manual

Page: 27 / 75

CL-CBH/EN (1901) 7.6
Commissioning 25
CombiLine-CombiBlocHorti
4 Commissioning
4.1 Inspection
Prior to commissioning the pump:
• Check if the fuses have been installed.
• Check if the impeller can rotate freely. Do this by rotating the shaft end with a
screwdriver through the hole in the protective cover of the electric motor.
• Check if the suction and delivery connections have been mounted correctly.
• Check the sense of rotation.
4.2 Commissioning
Proceed as follows, both for commissioning and after the pump is put back into
operation after repairs:
1 Open the valves. If there still is hot water in the pipes, open the valves gradually to
prevent pressure impulses or sudden changes of temperature, which would cause
serious damage to the pump.
2 Fill the system with liquid until the correct pressure is reached.
3 Bleed the system.
4 Switch on the pump.
4.3 Pump in operation
When the pump is in operation, pay attention to the following:
!
The pump should never run dry!
• Never use a stop valve in the suction line to control pump output. The stop valve
should always be fully opened during operation.
• Check whether the pressure difference between suction and delivery side
corresponds with the specifications of the pump's duty point.
• Check whether the absolute inlet pressure is sufficient, to prevent vaporization in the
pump. Vaporization may cause cavitation.
!
Cavitation should always be prevented since it causes serious damage to the
pump!