18
3.10.3 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. 20/a, the C.H. flow
temperature increases in correspondence
to the outside temperature.
EXAMPLE: Choosing a gradient of 15 with
an outside temperature of –10°C we shall
have a C.H. flow temperature of 60°C.
3.11
EXTERNAL TEMPERATURE
SENSOR
The "Logica Remote Control" can be con-
nected to an external temperature sensor
available 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 out-
side the dwelling.
For installation, follow the assembly instruc-
tions inserted in the package.
Fig. 20/a
Operating mode of external contact
External and ambient
sensor influence
Anti-bacterial function
If the entrance (terminals 3 and 4 of the socket) 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
