Solar Energy WILO ST 15/6 Bedienungsanleitung Seite 12

5. Commissioning
5.1 System filling and venting
The pump is normally vented automatically after a short operational period. Short-term
dry-running will not harm the pump. Direct venting of the pump, if necessary, is done
according to the following procedure:
- Switch off the pump,
- close discharge isolating valve,
- carefully slacken and remove the vent plug (Fig. 5).
Beware of possibly released hot liquid or vapour, depending on fluid
temperature and system pressure.
Danger of scalding exists!
- Carefully move pump shaft several times by means of screwdriver, - protect electrical
parts from leaking water
- Switch-on the pump
- After 15...30 sec close vent plug again,
- open isolating valve again.
ATTENTION!
It is possible that the pump shaft jams with the vent plug open, depending on
system pressure. The pump can become extremely hot, depending on the
operational state of the pump or the pipe system (fluid temperature).
Danger of scalding exists when touching the pump!
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