MAINTENANCE INSTRUCTIONS
43
Modulation circuit board
(see fig. 1-2)
•
Open the control panel
(see 6.3 “Accessing the
boiler”);
•
Disconnect all the connectors, remove the
regulating knobs, unscrew the four fixing screws and
remove the modulation circuit board;
•
Replace the circuit board and re-assemble the
components following the above procedure in
reverse order;
•
Switch on the electricity, water and gas supplies
and regulate the boiler
(see 5.3 “Gas data”)
;
The preset parameters of the printed circuit
board correspond to a 34 kw instantaneous
condensing boiler fed by natural gas.
When replacing the modulation circuit board,
it’s necessary to set parameter P00 according
to the boiler model (18-25-29-34-50).
modulation circuit board
Fig. 1
Fig. 2
modulation circuit board
