Sime Format System 25 HE, Installation And Servicing Instructions, Page: 12 / 32

10
3.1 ELECTRONIC BOARD
The electronic board is manufactured in
compliance with the EEC 73/23 low-volta-
ge directives. It is supplied with 230V. The
electronic components are guaranteed
against a temperature range of 0 up to
+60° C. An aut omatic and continuous
modulation system enables the boiler to
adjust power to the various system requi-
rements or the user’s needs.
3.1.1 Fault and malfunction signaling
The indicator LEDS signaling irregular
and/or incorrect operation of the equip-
ment are indicated in fig. 16.
3.1.2 Devices
The electronic board is equipped with the
following devices (fig. 15):
– “POT. RISC.” trimmer (pos. 6)
Sets the maximum heating power value.
To increase the value turn the trimmer
clockwise; to reduce the value turn the
trimmer anticlockwise.
– “POT. ACC.” trimmer (pos. 3)
Trimmer to vary the pressure level upon
ignition (STEP), of the gas valve. It has
been factory set with ignition STEP at 95
Hz. To increase pressure, turn the trim-
mer clockwise; to reduce pressure, turn
3 CHARACTERISTICS
Fig. 14
1
2
3
5
4 6
7
8
9
10 11
6 4
2
3
Fig. 15
Bi-colour led 1
Bi-colour led 2
KEY
1 Bicolour led 1
2 MAX fan speed trimmer
3 Ignition power trimmer
4 MIN fan speed trimmer
5 Bicolour led 2
6 Heating power trimmer
7 ---
8 Fusible (1,6 AT)
9 JP2 connector
10 JP1 connector
11 C.H. potentiometer
NOTE: To gain access to the regulating trimmers (2-3-4-6) remove the C.H. potentiometer knob.
Operating mode Bi-colour led 1 Bi-colour led 2
Stand-by green ON OFF
Flame presence green ON orange ON
Flame detection
circuit fault
green ON flashing orange
Ignition lock OFF red ON
Water flow switch (FL)
or limit stat (TL)
flashing orange OFF
intervention
Fan fault
flashing green OFF
C.H. sensor (SM)
fault
steady orange OFF
Boiler off OFF OFF