External Temperature Sensor; Characteristics; Electronic Board - Sime Dewy 30 Guia Del Usuario

2.8.3 Gradient of
the characteristic
heating curve
The gradient of the characteristic heating
curve is imposed on the current value "15"
of Logica. Increasing the gradient as shown
in the drawing of fig. 15, the delivery tempe-
rature increases in correspondence to the
outside temperature.
2.9 EXTERNAL TEMPERATURE
SENSOR
The "Logica Remote Control" can be con-
nected to an external temperature sensor
available a an optional extra (code
8094100).
This configuration ensures and maintains
the required temperature constant in the
room.
The ambient temperature is, in fact, indic-
ted and evaluated as the calculated mean
of the value measured inside and outside
the dwelling.
For installation, follow the assembly instruc-
tions inserted in the package.
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 voltage of 24V
to the following components: gas valve,
safety stat, C.H. and D.H.W. sensor, external
temperature sensor (optional), modulator,
micro divertor valve, flow switch safety
valve, water pressure transducer, room
stat or "Logica Remote Control".
An automatic and continuous modulation
system enables the boiler to adjust the heat
output to the various system requirements
or the User's needs.
The electronic components are guaranteed
against a temperature range of 0 to
+60°C.
90
Example: Choosing a gradient of 15 with an outside temperature
of –10°C we shall have a delivery temperature of 60°C.
3. 1 . 1 Fault finding
The indicator leds signalling 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:
– "POT. RISC." trimmer (10 fig. 17)
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. 17)
Trimmer to vary the pressure level upon
ignition (STEP), of the gas valve.
According to the type of gas for which
the boiler is equipped, the trimmer must
be regulated so as to obtain a pressure
of approx. 3 mbar at the burner for
methane gas and 7 mbar for propane
gas (G31).
To increase pressure, turn the trimmer
clockwise; to reduce pressure, turn the
trimmer counterclockwise.
The slow ignition pressure level can be
set during the first 3 seconds following
burner ignition.
After setting the pressure level upon
ignition (STEP) according to the type of
gas, check that the pressure for hea-
ting is still at the value previously set.
– "MET-GPL" connector (7 fig. 17)
With the connector switched-off, the
Fig. 15