Cetetherm Mini Plus CM737
Installation, service and operating instruction
45
17.10 Change the hotwater actuator and sensor
Maintenance and repairs must be carried out by an authorized service technician.
Before starting out repairs, close the shutoff valves
DH supply
,
DH return
,
cold-water
and
hot
water
.
Note the setting of the balancing valve, then close it.
Release the pressure using the DHWC safety valve.
After finishing repair; fill up the hot water circuit and vent.
Open the shutoff valves, start with
DH Supply
and then
DH return,
to avoid pollutions in the
system. Open the valves slowly to avoid pressure surges.
8. Disconnect the power feed to the substation.
9. Close the shut-off valves.
10. Unscrew the tap water actuator from the control valve.
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11. Disconnect the sensor in the heat exchanger.
12. Mount a new actuator and sensor.
13. Open the shutoff valves cold and hot water.
14. Open and adjust the balancing valve.
15. Vent the circuit by opening a hot water tap.
16. Connect the power feed to the substation.
17. Open the shutoff valves DH Supply and then DH return.
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