27
Main board settings
The boiler is equipped with a Microprocessor modulation board, featuring a 6-microswitch array
(SW1÷SW6) which allow to make personalizing actions for the boiler’s functioning as described in the
following table .
Disconnect the power supply
before approaching the microswitches. Restore the power supply
only after you have closed the back cover of the control panel.
Changes to microswitches status have no effect until the boiler is electrically supplied (they are
red during the board startup, when the supply is connected).
S1
M15
M4
M2
M16
M6
M1
S1
28
27
26
25
24
23
22
21
39
38
7
8
9
10
1
2
3
4
5
6
68
69
70
71
72
73
74
75
SW1
SW6
ON
ON
SW 1
ON
OFF
SW 2
SW 3
SW 4
SW 5
SW 6
00014 00
SW1
OFF Natural gas
Functioning.
ON Butane (G30)
or
Propane (G31)
Functioning.
The factory setting depends on the gas type arranged in factory for the boiler. To change
the type of gas supply, it is necessary to follow the complete instructions described in the
paragraph "Gas conversion" on page 28.
SW2
OFF
In City Basic Boilers it must be
OFF
.
Factory setting
.
SW3
It determines the delay of 3 minutes, before the new ignition of the burner after the over-
coming of the heating set temperature.
OFF delay ON
(for normal radiators systems).
Factory setting
.
ON delay OFF
(for fan coil systems).
SW4
OFF
In City Basic Boilers it must be
OFF
.
Factory setting
.
SW5
Pump functioning mode during heating working.
OFF intermittent
for normal applications (with or without delay, see SW3).
Factory setting
.
ON
always off
(external pumps are present).
Remark:
The pump will be
anyway activated in all other circumstances, e.g. during the DHW functioning,
for post-circulation (if
foreseen
) or for anti-freezing or anti-lockout functions.
SW6
OFF
In City Basic Boilers it must be
OFF
.
Factory setting
.
