Cetetherm Mini Plus CM737
Installation, service and operating instruction
41
1. Disconnect the power feed to the substation.
2. Close the shut-off valves.
3. Use a wrench and release the filter cover and remove the
cartridge.
4. Clean the filter with water and refit the cartridge. Screw the
filter cover with a momentum of 10-20 Nm.
5. Fill up the heating circuit using the toping up valve, vent the
heating circuit.
6. Open the shutoff valves and connect the power feed to the
substation.
7. After final bleeding, the pressure should not be less than
1.0 bar in winter and not less than 0.6 bar in summer.
17.3 Change the complete DHWC 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
,
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.
Check the DHWC circulation.
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 and the balancing valve.
3. Choose alternative a or b.
a) When changing the complete pump, release the brass
nuts with a wrench and replace the pump.
Connect the pump cable.
b) Only changing the motor, release it by unscrewing four
socket head cap screws and replace the motor.
Connect the pump cable.
4. Open the shut-off valves cold-water and hotwater.
5. Open and adjust the balancing valve.
6. Vent the circuit by opening a hot water tap.
7. Connect the power feed to the substation.
8. Open the shutoff valves DH Supply and then DH return.
Picture 25
Picture 24
