Characteristics; Electronic Board; Control Leds - Sime Format Instrucciones Para El Instalador

2. 1 0.6 "25 BF - 30 BF" wiring diagram with HONEYWELL control box
Note: The room stat (TA) must be connected to the terminals 22-23
3

CHARACTERISTICS

3. 1

ELECTRONIC BOARD

The electronic boards are manufactured in
compliance with the EEC 73/23 low-voltage
directives. They are supplied with 230V and,
through a built-in transformer, send a volta-
ge of 24V to the following components:
modulator, C.H. sensor and time program-
mer. An automatic and continuous modula-
tion system enables the boiler to adjust the
heat output to the various system require-
ments or the User's needs. The electronic
components are guaranteed against a tem-
perature range of –10 to +60°C.
3. 1 . 1 Central heating operation
Upon demand for heating from the room
temperature stat, the circulation pump is
activated, and approximately 90 seconds
must elapse for the burner to start opera-
ting. This will happen only if the temperature
is set above the value detected by the hea-
ting sensor. The setting range is between
40 and 80°C. The heat output can be varied
according to the system needs by adjusting
84
the trimmer (1 fig. 21). At start-up of each
working cycle, after the period of slow igni-
tion having a duration of approx. 5 sec, the
boiler will set itself at the heat output set on
the "Minimum heating pressure" trimmer.
3. 1 .2 D.H.W. operation
Upon demand for hot water, the boiler
starts instantaneously when the microswit-
ch on the pressure switch valve trips. The
required power output is regulated, via
flame modulation, by the hot water sensor,
which will compare the temperature read
with the temperature set on the potentio-
meter. The adjustment range is between 40
and 60°C. When the heating flow sensor is
at 75°C the electronic limiter will trip and
switch-off the burner. The burner will re-igni-
te when the temperature falls below 2 °C.
3. 1 .3

Control leds

The electronic board is equipped with control
leds which show some of the possible failures
CONNECTOR SPARE
PART CODES:
J1 code 6260956
J2 code 6260959
J3 code 6260968
J5 code 6260964
KEY
EV1 Gas valve coil
EV2 Gas valve coil
EA Ignition electrode
ER Sensing electrode
A HONEYWELL S4565CF
control box
TS 100°C safety stat
PF Smoke pressure switch
V Fan
PA Water pressure switch
P Circulation pump
VP Divertor valve
TAG Antifreeze stat (optional)
C Rotary switch
TA Room stat
M Modulator
SM S.H. sensor
TL Limit stat
that can cause an irregular and/or improper
operation of the appliance. The leds are loca-
ted on the card as indicated in fig. 21 and
marked with the following wording:
– "LD1 BLOCCO"
Red led on when control box, safety stat
and/or smoke stat trips.
– "LD2 LINEA"
Green led off when there is no tension
present.
3. 1 .4 Devices available
on the electronic board
The electronic board is equipped with the
following devices:
– "POT. RISC." trimmer (1 fig. 21)
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 (6 fig. 21)
Trimmer to vary the pressure level upon
ignition (STEP), of the gas valve.
Fig. 20/c