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Input function terminal 3-4
PT
GB
Operating mode of external contact
External and ambient
sensor influence
Anti-bacterial function
(if tank unit is installed)
2. 1 0.3 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. 18, the delivery temperature
increases in correspondence to the outside
temperature.
2. 1 1
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 con-
stant in the room. The ambient temperatu-
re is, in fact, indicted and evaluated as the
calculated mean of the value measured insi-
de and outside the dwelling. For installation,
follow the assembly instructions inserted in
the package.
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The freely programmable input (terminals 3-4) allows three different functions
64
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.
If the entrance (terminals 3 and 4 of the base) is connected to a zero potential
65
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)
Operating mode open (interruption)
Determines the mix ratio between the internal and external ambient sensor
66
when parameter 64 = 1.
0 %
= internal sensor only active (0% external - 100% internal)
50 % = mean value of external + 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
69
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
Example: Choosing a gradient of 15 with an outside temperature of
–10°C we shall have a delivery temperature of 60°C.
1 = active
0 0 0
_ _ _
Fig. 18
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