Cetetherm Midi Wall TA
Installation, service and operating instruction
19
8 Service actions for the installer
8.1 Check the function of the hot water valve and actuator
Service actions must be carried out by an authorized service technician.
Close the shutoff valves for the
DH supply
and
DH return
together with the
cold
and
hot wate
r.
Relieve the pressure in the circuit.
After finishing repair, open the shutoff valves. Start with
DH supply
and then the
return
lines, to
avoid pollutions in the system. Open the valves slowly to avoid pressure surges.
1. Disconnect the power supply to the substation.
2. Lower the manual operation handle to stop the motor. It is easier
to lower the manual operation handle if you twist it a little forward
and backwards when it is lowered a little.
3. Try to operate the actuator manually by turning the handle.
•
Actuator opens, the screw of the actuator moves against
the red mark.
•
Actuator closes, the screw of the actuator moves
inwards, against the blue mark. When the actuator closes
it pull the valve spindle in.
Picture 13
4. Loosen the screws on the brace that holds the actuator to the
valve, lift off the actuator.
Note!
The valve can be very hot
A working valve will be fully open.
5. Carefully press the valve spindle with a tool and check the
valve´s travel and spring back.
NOTE:
The valve may be very hot!
Picture 14
6. Carefully press the valve’s spindle with a tool and check the
valve’s travel and spring back.
NOTE! The valve may be very hot!
7. Mount the actuator on the valve, slide the actuator onto the valve
neck, thus making the square nut on the valve spindle fit into the
groove on the cross bar. Then slide the brace into the groove on
the valve neck and secure the nuts.
8. Raise the operation handle on the actuator to start the motor.
9. Connect the power supply to the substation.
Picture 15
