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8.1
Filling and bleeding
Fill and bleed the system correctly.
Note: Ready-to-use mixtures must be filled in solar thermal
installations. The pump is not allowed to be used for mixing the
fluid in the system.
The pump does not pump any water if there is air in the pump
room.
The pump rotor compartment is vented automatically after a
short operating period. Dry running for short periods will not
harm the pump.
Please proceed as follows if it is necessary to vent the rotor
room:
• Switch off the pump.
WARNING! Danger of personal injury!
Depending on the operating status of the pump or system
(fluid temperature), the entire pump can become very hot.
Touching the pump can cause burns!
• Close the check valve on the pressure side piping.
WARNING! Danger of personal injury!
Depending on the temperature of the fluid and system pres-
sure, when the venting screw is opened, hot liquid or gaseous
fluid may escape or shoot out at high pressure. Escaping fluid
can cause scalding!
• Undo the venting screw carefully with a suitable screwdriver
and unscrew it completely (Fig. 9).
• Carefully push back the pump shaft with a screwdriver several
times.
• Protect electrical parts from any escaping water.
• Switch on the pump.
Note: The pump may jam if the venting screw is undone,
depending on the operating pressure level. The necessary
Installation and operating instructions Wilo-Star STG
German
29
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