Cetetherm Mini Plus CM737
Installation, service and operating instruction
39
16.4 Run the pump manually
Service actions must be carried out by an authorized service technician.
Hand maneuver of the heating actuator
The room thermostat must be without current when maneuvering the actuator by hand.
If it necessary to run the pump and actuator manually, this can be done by disconnecting the power to the
operator control panel.
1. Disconnect the power feed to the substation and the power cable to the pump.
2. Connect the replacement cable (option) to the circulation pump.
3. Open the heating valve manually by turning the actuator knob counter clockwise.
Open the control valve sufficiently to satisfy the heating needs.
4. Connect the power feed to the substation.
Note!
This is a temporary solution until the control unit problem is solved.
16.5 Check the volume take-up and pressure equalizing of the expansion vessel
Check the expansion vessel for possible leakage.
The cause may be that the expansion vessel cannot manage the volume changes on the heating side. The
expansion vessel may have to be replaced.
See
17.12 Change the expansion vessel
Alternatively, the system´s total volume of water may be too high, i.e. the volume changes are too large for the
expansion vessel. If so, add extra expansion volume.
