Cetetherm Mini Plus CM737
Installation, service and operating instruction
46
17.11 Change the DHWC check valve
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.
1. Disconnect the power feed to the substation.
2. Close the shut-off valves.
3. Use a wrench and unscrew the pipe between the pump and T-
connection.
4. Remove the old check valve and mount a new.
NOTE
! Make sure that the check valve is mounted in the correct
way.
Flow direction
5. Mount the pipe again.
6. Open the shutoff valves cold and hot water.
7. Open and adjust the balancing valve.
8. Vent the circuit by opening a hot water tap.
9. Connect the power feed to the substation. Open the shutoff valves
DH Supply and then DH return.
Bild 3
17.12 Change the expansion vessel
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 circuit safety valve.
After finishing repair, fill up the circuit and vent.
Then open the shutoff valves, start with
DH supply
and then the
return
line, to avoid pollutions in
the system.
Then open
heat return
and then
supply
. Open the valves slowly to avoid pressure surges.
1. Disconnect the power feed to the substation.
2. Close the shut-off valves.
3. Replace the expansion vessel.
4. Fill up the heating circuit using the toping up valve, vent the heating circuit.
5. Open the shutoff 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.
