Cetetherm Mini Plus CM737
Installation, service and operating instruction
42
17.4 Change the complete heating pump or pump components
Maintenance and repairs must be carried out by an authorized service technician.
Before starting out repairs, close the shutoff valves
DH supply
,
DH return
,
heating supply
and
heating return
.
Release the pressure using the heating safety valve.
After finishing repair; fill up the
heating circuit
and vent.
Open the shutoff valves, start with
heating return
and then
heating supply
, then
DH Supply
and
DH return,
to avoid pollutions in the system.
Open the valves slowly to avoid pressure surges.
Change the complete pump or just the pump motor.
1. Disconnect the power feed to the substation, disconnect
the power cable to the pump.
2. Close the shut-off valves.
3. Choose alternative a or b.
c) When changing the complete pump, release the brass
nuts with a wrench and replace the pump.
Connect the pump cable.
d) Only changing the motor, release it by unscrewing four
socket head cap screws and replace the motor.
Connect the pump cable.
4. Fill up the heating circuit using the top up valves. Vent the
heating circuit.
5. Open the shut-off valves and connect the power feed to the
substation.
6. After final bleeding, the pressure should not be less than
1.0 bar in winter and not less than 0.6 bar in summer.
17.5 Change the heating supply temperature sensor
1. Disconnect the power feed to the substation.
2. Close the heating actuator by turning the knob clockwise to its
closing position.
3. Disconnect the quick-connect terminals and replace the
sensor with a new one.
4. Connect the power feed to the substation.
5. Check the sensors value on the control panel after 5 min.
Picture 27
Picture 26
