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Setting the temperature control
3.3
TEMPERATURE CONTROL is enabled in the following way:
ƒ access the technical parameters as explained in paragraph
"1.14 Accessing the parameters"
ƒ select menu P4 and then P4.18 = 1
Temperature control only works with the outdoor temperature sen-
sor connected, and is only active for the HEATING function.
If P4.18 = 0, or the outdoor temperature sensor is disconnected,
the boiler will work with a fixed point. The temperature measured
by the outdoor temperature sensor is shown in "3.22 INFO menu",
item I009.
The temperature control algorithm does not use the measured
outdoor temperature value directly; it uses a calculated outdoor
temperature value that takes into account the building insulation:
in buildings that are well insulated, the outdoor temperature varia-
tions will have less impact than those that are poorly insulated by
comparison.
REQUEST FROM OT TIMED THERMOSTAT
In this case, the delivery setpoint is calculated by the timed ther-
mostat on the basis of the outdoor temperature value, and by the
difference between the real ambient temperature and the required
ambient temperature.
REQUEST FROM ROOM THERMOSTAT
In this case, the delivery setpoint is calculated by the adjustment
board on the basis of the outdoor temperature value, to obtain an
estimated ambient temperature of 20° (reference ambient temper-
ature).
There are 2 parameters that work together to calculate the output
setpoint:
ƒ slope of the compensation curve (KT)
ƒ reference ambient temperature offset
Selecting the temperature control bend (parameter P4 .19)
The temperature control bend for heating maintains a theoretical
temperature of 20°C in the room when the outdoor temperature is
between +20°C and -20°C. The choice of the curve depends on
the minimum outdoor temperature envisaged (and therefore on the
geographical location), and on the delivery temperature envisaged
(and therefore on the type of system). It is carefully calculated by
the installer on the basis of the following formula:
KT =
project delivery T - Tshift
20- min. design external T
Tshift = 30°C standard system
25°C floor installations
If the calculation gives an intermediate value between two bends,
you are advised to choose the temperature control bend closest to
the value obtained.
Example: if the value obtained from the calculation is 1.3, this is
between curve 1 and curve 1.5. Choose the nearest curve, i.e. 1.5.
The KT values that can be set are as follows:
ƒ standard system: 1.0-3.0
ƒ floor system 0.2-0.8
Use the interface to access menu P4 and parameter P4.19 in order
to set the predefined temperature control bend:
ƒ access the technical parameters as explained in paragraph
"1.14 Accessing the parameters"
ƒ select menu P4 and then P4.19
ƒ press
to confirm
ƒ set the required control bend using the arrow buttons
Enter
ƒ confirm by pressing
.
100
90
T AT
80
70
60
50
T BT
40
30
20
20
15
TAT maximum heating setpoint temperature in standard systems
TBT maximum heating setpoint temperature in free-standing systems
Reference ambient temperature OFFSET
In any case, the user can indirectly modify the HEATING setpoint
value by inserting an offset on the reference temperature (20°C).
This offset may vary from -5 to +5 (offset 0 = 20°C).
To correct the offset, refer to paragraph "3.8 Adjusting the heating
water temperature with an outdoor temperature sensor connected".
90
80
70
60
50
40
30
+5°C
20
20°C
10
30
25
NIGHT-TIME COMPENSATION (parameter P4 .20)
If a timer is connected to the ROOM THERMOSTAT input, night-
time compensation can be enabled via menu P4, parameter P4.20.
To set night-time compensation:
ƒ access the technical parameters as explained in paragraph
"1.14 Accessing the parameters"
ƒ select menu P4 and then P4.20
ƒ press
to confirm
ƒ set the parameter value at 1
ƒ confirm by pressing
In this case, when the CONTACT is CLOSED, the heat request is
made by the flow sensor on the basis of the outdoor temperature,
to obtain a nominal temperature in the room at DAY level (20°C).
The OPENING of the CONTACT does not produce a switch-off,
but a reduction (parallel translation) of the climatic curve on NIGHT
level (16°C).
90
80
70
DAY TEMPERATURE CURVE
60
50
40
30
20
and
10
20
15
In this case too, the user can indirectly modify the HEATING set-
point value by inserting an offset on the reference DAY temperature
(20°C) or NIGHT temperature (16°C). This offset may vary from
[-5 to +5]. To correct the offset, refer to paragraph "3.8 Adjusting
the heating water temperature with an outdoor temperature sensor
connected".
37
THERMOREGULATION CURVES
3,0
2,5
10
5
0
-5
-10
External temperature (°C)
CLIMATIC CURVE CORRECTION
-5°C
20
15
10
5
0
-5
External temperature (°C)
Enter
PARALLEL NIGHT TIME REDUCTION
NIGHT TEMPERATURE CURVE
10
5
0
-5
-10
External temperature (°C)
2,0
1,5
1,0
0,8
0,6
0,4
0,2
-15
-20
-10 -15 -20
-15
-20
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