Cetetherm Midi Wall TA
Installation, service and operating instruction
24
9.4 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 all shutoff valves
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 head.
1. Disconnect the power supply to the substation and the pump.
2. Close the shut-off valves.
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 pump head
Loosen the screw in the clamp that holds the pump head and
pump housing together.
Mount a new pump head, fit and tighten the screw that holds the
clamp to 8 Nm ± 1 Nm.
NOTE
! Do not retighten the screw if condensed water is dripping
from the clamp.
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 supply to the
substation.
Picture 23
