Velux TFF 200 Directions For Use Manual page 25

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 pres-
sure. Danger of scalding exists!
SECTION II: SOLAR PUMP STATION
– 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!
25 VELUX