Input function terminal 3-4
The freely programmable input (terminals 3-4) allows three different functions
to be activated. The parameter has the following significance:
1
= If an external sensor is connected, the display will show the temperature
of the external sensor ( _ _ = no sensor connected, function disabled).
2
= With an external contact, it is possible to switch-over to "reduced pre-
set value of the ambient temperature".
3
= With an external contact, it is possible to switch-over to "reduced pre-
set value of the antifreeze ambient temperature" (short circuit 0 0 0 or
interruption _ _ _ ). The display shows the current status of the external
contact.
64
Operating mode of external contact
External and ambient
sensor influence
Anti-bacterial function
(with storage capacity boiler unit)
If the entrance (terminals 3 and 4 of the base) is connected to a zero potential
external contact (parameter 64 = 2 or 3), the operating mode of the contact
can be determined (remote telephone switch or window contact). The operating
mode specifies the status of the contact in which the required function is active.
Display:
Operating mode closed (short circuit)
0 0 0
Operating mode open (interruption)
_ _ _
Determines the mix ratio between the internal and external ambient sensor
when parameter 64 = 1.
0 %
= internal sensor only active (0% external - 100% internal)
50 %
= mean value of ex internal sensor
100 %
= external sensor only active
The set mix is used for ambient control and display.
If the external sensor is short circuited or interrupted, the operation conti-
nues with the internal sensor.
This function allows the hot water to be brought to a high temperature once
a week in order to eliminate eventual pathogenic agents.
It is active every Monday for a maximum duration of 2.5 hours at a delivery
temperature of 65°C.
0 = not active 1 = active
65
66
69
2.11.3 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. 17, the delivery tempe-
rature increases in correspondence to the
outside temperature.
2.12
EXTERNAL TEMPERATURE
SENSOR
The "Logica Remote Control" can be connec-
ted to an external temperature sensor availa-
ble a an optional extra (code 8094100). This
configuration ensures and maintains the
required temperature constant in the room.
The ambient temperature is, in fact, indicted
and evaluated as the calculated mean of the
value measured inside and outside the dwel-
ling. For installation, follow the assembly
instructions inserted in the package.
Fig. 17
Example:
Choosing a gra-
dient of 15 with an outsi-
de temperature of –10°C
we shall have a delivery
temperature of 60°C.
17
