SAT102
heat interface unit
7
Maintenance
All maintenance procedures should be carried out by an authorised
technician.
Regular maintenance guarantees better efficiency and helps to save
energy.
Before carrying out any maintenance, repair or part replacement work,
proceed as follows:
•
Switch off the electricity supply
•
Close the isolation valves
•
Drain the HIU using the drain cocks provided.
Heat exchanger replacement
•
To remove the heat exchanger, loosening the 2 socket head screws
holding it in place (A)
•
Replace the heat exchanger and the O-rings.
•
Re-tighten the 2 fixing screws (A) to a maximum torque of 3Nm.
N.B.
The pins fixing the heat exchanger are positioned in such a way as
to prevent it being fitted incorrectly.
Temperature probe replacement
•
Disconnect the probe cable, lightly folding the tab (C) and
extracting the connector.
•
Unscrew the probe.
•
Fit the new probe.
•
Re-fit the connector respecting the only possible way it can be
inserted.
Replacing the valve actuator
•
Disconnect the actuator cable, lightly pressing the tab on the
connector and extracting it.
•
Extract the fixing clip (D) and then the actuator.
•
Position the new actuator (E).
•
Insert the fixing clip, respecting the correct direction.
•
Re-connect the connector.
Replacing the valve obturator
•
Disconnect the valve actuator - see previous section.
•
Unscrewing the lock nut (F) and extract the obturator.
•
Replace the obturator and then refit the lock nut (F).
•
Insert the fixing clip, respecting the correct direction.
•
Re-connect the connector.
Replacing the DHW priority flow meter
•
Disconnect the flow meter cable from the connector.
•
Extract the flow sensor (G).
•
Position and fit the new sensor.
•
Re-connect the cable respecting the only possible way it can be
inserted.
G
F
D
E
C
A
A
