Velux PSKR Mode D'emploi page 21

Beware of possibly released hot liquid or vapour,
depending on fluid temperature and system pres-
sure. 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 secs 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!
SAFEty PRECAUtIoNS FoR thE oPERAtoR
21 VELUX