15
GB
start-up
2) error reset
If resettable errors occur inside the boiler,
the device can read the closure of a clean
contact via input IN1 and send a reset com-
mand to the boiler.
If the clean contact of a modem is con-
nected to input IN1, the boiler can be reset
remotely without having to work on the in-
stallation itself.
L
N
L
N
IN 1
IN 2
OUT 1
L
N
OUT 2
L
N
230V
OUT 3
IN 3
BUS
B
T
PARAMETER 1100 = 3
[Differential thermostat]
L
N
L
N
IN 1
IN 2
OUT 1
L
N
OUT 2
L
N
230V
OUT 3
IN 3
BUS
B
T
In this mode the device functions as a ge-
neric differential thermostat between the
sensors connected to inputs IN1 and IN2,
with the following logic.
If the IN1 temperature exceeds the IN2
temperature by a certain number of de-
grees (set via parameter 1120), output
OUT1 is activated.
If, on the other hand, the difference be-
tween the two temperatures drops below a
certain number of degrees (set via param-
eter 1121), output OUT1 is deactivated.
In any case, output OUT1 is activated when
the IN1 temperature drops below a certain
value (set via parameter 1124), and deac-
tivated when the IN1 or IN2 temperature
exceeds a certain value (set via parameters
1122 and 1123).
Par.
Description
Range
1110
Reading
IN1 temperature
-20 - 150°C
1111
Reading
IN2 temperature
-20 - 150°C
1120 ON
differential
0 - 30°C
1121
OFF differential
0 - 30°C
1122
Temperature
maximum 1
0 - 130°C
1123
Temperature
maximum 2
0 - 130°C
1124
Temperature
minimum 1
0..130°C
ERROR INDICATION
FOR CLEAN CONTACT
(E.G. MODEM)
BOILER
230 V
PUMP
SENSOR SENSOR
BOILER
ZONES
SOLAR HEAT-
ING SYSTEM
