English
80
WILO SE 05/2010
9
Commissioning
Preparation
Before commissioning, the pump and module must be at ambient
temperature.
9.1
Priming and bleeding
• Prime and bleed the system following the proper procedures.
CAUTION! Damage to the pump!
Dry running will destroy the mechanical seal.
•
Make sure that the pump does not run dry.
• To avoid cavitation noise and damage, a minimum intake pressure
must be guaranteed at the suction port of the pump. This minimum
intake pressure depends on the operating situation and the duty point
of the pump, and must be defined accordingly.
• The main parameters for defining the minimum intake pressure are
the NPSH of the pump at its duty point and the vapour pressure of the
fluid.
• Bleed the pumps by releasing the bleed valves (Fig. 34, Item 1). Dry
running destroys the mechanical seal of the pump. The differential
pressure sensor must not be bled (risk of destruction).
WARNING! Danger due to extremely hot or extremely cold pressu-
rised fluid!
Depending on the temperature of the fluid and the system pres-
sure, when the vent screw is opened completely, extremely hot or
extremely cold fluid in liquid or vapour form may escape or shoot
out at high pressure.
• Always exercise caution when opening the vent screw.
• Protect the module box from any water escaping when bleeding.
WARNING! Risk of burns or freezing to the pump when body parts
come into contact with the pump!
Depending on the pump or system operating conditions (fluid tem-
perature), the entire pump can become very hot or very cold.
• Keep a safe distance during operation!
• Allow the pump/system to cool off/warm up before performing any
work.
• Always wear protective clothing and gloves when working.
WARNING! Risk of injury!
If the pump/system is installed improperly, liquid may be ejected
during commissioning. Individual components may also become
loose.
• Keep a safe distance from the pump during commissioning.
• Wear protective clothing and gloves.
DANGER! Risk of fatal injury!
Falling pumps or pump parts may result in life-threatening injuries.
• When performing installation work, protect the pump components
against falling.
Fig. 34: Bleed valve
1
