92
EN
Cod. 3541T090 - Rev. 00 - 06/2019
MAINTENANCE
15.9 Boiler - Extraordinary maintenance and replacement of components
After replacing the gas valve, burner, electrode and circuit board, it is necessary to carry out the 100% calibration (see “100% calibration” on page 68). Then follow
the instructions in par. “Checking the combustion values” on page 68.
Gas valve
fig. 183 - Sostituzione valvola a gas
•
Disconnect the power supply and turn off the gas cock ahead of the valve.
•
Disconnect the connectors
•
Disconnect the gas supply pipe
•
Undo the screws “1”
•
Remove the clamp “2”
•
Remove the gas valve
•
Then undo the screws “4”
•
Fit the new valve, carrying out the above steps in reverse order
fig. 184 - Gas diaphragm replacement
Boiler - Plate heat exchanger
A
Before carrying out the following instructions it is advisable to protect the room and the boiler’s electrical box
against accidental water spillage
2
1
3
5
4
4
5
fig. 185 - Sostituzione/manutenzione scambiatore a piastre
• Isolate the boiler by operating the DHW inlet and system shut-off valves.
• Open a faucet to drain the domestic hot water.
• Rotate the box on the panel “3” fig. 185
• Drain the water in the boiler through the drain faucet (see “15.5 System draining” on page 89).
• Undo the screws “4” fig. 185
• Move the plate heat exchanger “5” fig. 185 back and slide it to the left.
• Remove the heat exchanger as shown in the figure
• When refitting the plate heat exchanger, make sure the arrows (indicating: HEATING) are pointing downwards.
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