Cetetherm Midi Wall TA
Installation, service and operating instruction
25
9.5 Change the heating or hot water valve
Maintenance work must be carried out by an authorized service technician.
Disconnecting the power feed to the pump and the substation.
Before starting out repairs always close the primary supply and return shutoff valves and
drain the system.
After finishing repair, open the shutoff valves. Start with
primary supply
and then the
return
lines, to avoid pollutions in the system. Open the valves slowly to avoid pressure
surges.
Do the same on the heating side open first
heat return
and then
supply
. Fill up the
system, start the pump and vent.
1. Lower the operation handle on the actuator to stop the motor.
2. Loosen the screws on the brace that holds the actuator to
the
valve, lift off the actuator.
Note! The valve can be very hot
Picture 24
3. Use a wrench to remove the control valve. Note the arrow
direction on the valve.
4. Mount a new valve;
and take especially care to the arrow
direction
.
5. Mount the actuator on the valve, slide the actuator onto the valve
neck, thus making the square nut on the valve spindle fit into the
groove on the cross bar. Then slide the brace into the groove on
the valve neck and secure the nuts.
6. Raise the operation handle on the actuator to start the motor.
9.6 Change the expansion vessel
Maintenance work must be carried out by an authorized service technician.
Disconnecting the power feed to the pump and the substation.
1. Close the shutoff valves for the radiator supply and return.
2. Replace the expansion vessel.
