Wilo Star-RS Serie Notice De Montage Et De Mise En Service page 26

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.
• Screw the venting screw back in again after 15 to 30 seconds.
• Open the check valve again.
8.2 Variable speed control
If rooms cannot be heated sufficiently, the speed of the pump
may be too low. It is then necessary to switch over to a higher
speed. If, on the other hand, the pump is set to a speed which is
too high, flow noises are created in the lines and in particular at
throttled thermostatic valves. They can be resolved by switch-
ing to a lower speed. A rotary knob on the terminal box is used
to switch over to a different speed stage. The small marking
indicates the lowest, and the large marking indicates the high-
est speed (Fig. 8).
Installation and operating instructions Wilo-Star RS/RSD
English
15