Cetetherm Mini Plus CM737
Installation, service and operating instruction
38
16.2 Check the heating actuator and valve function
Service actions must be carried out by an authorized service technician.
The control panel must be without current when maneuvering the actuator by hand.
Check the actuator by pulling out the electrical cable and refit it
again; this will start an automatic self-test for the actuator.
See
7.3 Starting up and component control of control panel
Check the flow using the energy meter while test-running the valve.
If no energy meter is available, disconnect the heating actuator from
the valve. Close the actuator by turning the knob clockwise, this will
make it easier to reattach.
Carefully depress the valve’s spindle with a tool and check the
valve’s travel and spring back.
NOTE! The valve may be very hot!
Picture 21
16.3 Check the circulation pump Grundfos UPS
If the pump fails to start after stopping, try to start it at the highest setting.
Service actions must be carried out by an authorized service technician.
Disconnect the power feed to the pump by pulling off the connecter before carrying out this task. If
the current is on when you use a screwdriver to assist the pump to start, the screwdriver may be
wrenched out of your hand when the pump starts.
If the pump does not start, the pump normally can be started by removing
the pump motor end nut and helping the pump to start with the aid of a
screwdriver in the notch on the engine shaft.
If possible, use a short screwdriver. If the pump is difficult to access,
disconnect the heating actuator.
Connect the power feed to the pump and try to start again.
Picture 22
