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Setpoint_T_CH_Low
2
Low temperature circuit setpoint (parameter 3)
If the "fixed point" operating mode is set (par. 22=CH_type_low=0), it is the target temperature.
If the "climatic control" operating mode is set (par. 22=1) , it is the maximum target temperature with minimum outdoor
temperature (T_out_min=par. 37, preset to 0°C).
parameter 24 (T_ch_low_foot, preset to 25°C) defines the minimum setpoint at maximum outdoor temperature (T_out_
max=par. 38, preset to 18°C).
Preset to 40°C and upper value limited by par. 23 (T_ch_low_limit, preset to 50°C).
100
90
80
70
60
50
40
30
20
10
0
25
Therefore, it is possible to work with a fixed point or set a climatic curve on every circuit.
CH_Priority
3
Heating priority (parameter 16)
If set to 0, the system will work without heating priority with the high temperature and low temperature circuits served in
parallel.
If set to 1, the demand from the low temperature circuit is ignored and the relative pump remains off. The low temperature
circuit demand is only accepted when the high temperature circuit demand is inactive. Vice versa, if set to 2, the low
temperature circuit has priority.
Preset to 0.
9 .2 Setting the DHW parameters
The following DHW parameters can be set:
Setpoint_DHW
1
DHW setpoint (parameter 2)
This is the production temperature for DHW.
The maximum limit is indicated by par. 8 (T_DHW_limit,
preset to 60°C).
Preset to 50°C.
CLIMATIC CURVE
LOW TEMPERATURE circuit
T_CH_Low_foot
T_out_min
T_out_max
20
15
10
External temperature (°C)
Max heat
requirement
T_CH_Low
5
0
-5
-10
DHW_Type
2
Boiler type (parameter 6)
0 = No DHW service
1 = Quick exchanger with sensor
2 = Boiler with sensor
6 = Boiler with thermostat
In the case of a boiler with a thermostat, if the input is a
closed contact, the DHW demand is activated, if it is an
open contact the demand stops.
Preset to 0.
-15
-20
Fig. 23
25
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