Description of functioning
technical
51
tions, i.e. the 3-way valve micro switch and the thermistor connections.
- Remove the heating outlet pipe (2) from the hydraulic unit.
- Remove the pressure sensor from the heating return pipe, for ease of handling.
- Remove the heating outlet pipe (3) from the heat exchanger for ease of handling.
Remove the screws holding unit 1 to the boiler base (they are on the underside).
- Release unit 1 from the lower connectors (DHW inlet and outlet and heating outlet).
The water intake connectors do not need to be removed.
Changing the plate heat exchanger :
- Remove the four screws holding the plate heat exchanger to unit 1 (be very careful
with the O-rings; they should be changed).
Changing the 3-way valve diaphragm :
- Firstly, remove the plate heat exchanger.
- Remove the diaphragm cover (see photograph 26).
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