Cetetherm Mini Plus CM737
Installation, service and operating instruction
44
17.8 Change the heating valve
The temperature and the pressure of the district heating water are very high. Only qualified
technicians can work with the district heating substation. Incorrect operation may cause serious
personal injury and result in damage to the building.
Before starting out repairs close the
DH supply
and
DH return
shutoff valves.
After finishing repair; open the shutoff valves. Start with
DH supply
and then the
return
line, 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. Unscrew the heating actuator from the control valve.
4. Use a wrench to remove the control valve.
Note the arrow direction on the valve.
5. Mount a new valve; and take especially care to the arrow direction.
6. Close the actuator by turning the knob clockwise to the closing
position. Fasten the actuator, use only hand power.
7. Open the shutoff valves and connect the power feed to the substation.
Picture 31
17.9 Change the hot water valve
The temperature and the pressure of the district heating water are very high. Only qualified
technicians can work with the district heating substation. Incorrect operation may cause serious
personal injury and result in damage to the building.
Before starting out repairs close the
DH supply
and
DH return
shutoff valves.
After finishing repair; open the shutoff valves. Start with
DH supply
and then the
return
line, 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. Unscrew the tap water actuator from the control valve.
Picture 32
4. Use a wrench to remove the control valve.
Note the arrow direction on the valve.
5. Mount a new valve; and take especially care to the arrow
direction.
6. Fasten the actuator.
7. Open the shutoff valves and connect the power feed to the
substation.
Picture 33
