Beretta POWER PLUS Installation Instruction page 46

2 Setpoint_T_CH_Low
Set point in the low temperature circuit (parameter 3)
If the operating mode is set to "fixed set point" (par. 22=CH_type_low=0), this is the objective temperature.
If the operating mode is set to "climate control" (par. 22=1), this is the maximum objective temperature for the mini-
mum outside temperature (T_out_min=par. 37, pre-set to 0°C).
Parameter 24 (T_CH_low_foot, pre-set to 25°C) defines the minimum set point for the maximum outside temperature
(T_out_max, pre-set to 18°C).
Pre-set to 40°C with upper limit set by par. 23 (T_CH_Low_limit, pre-set to 50°C).
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Consequently, each circuit can operate with a fixed set point or using a set climate control curve.
3 CH_Priority
Central heating priority (parameter 16)
If this is set to 0 the system works without central heating priority, that is, with the high temperature and low tempe-
rature circuit served in parallel.
If set to 1, the demand from the low temperature circuit is ignored and the corresponding pump remains off.
The demand from the low temperature circuit is only accepted when the high temperature circuit is off.
Vice-versa, if set to 2 the low temperature circuit has priority.
Pre-set to 0.
CLIMATE CONTROL CURVE
LOW TEMPERATURE CIRCUIT
100
90
80
70
T_CH_Low_foot
60
50
T_out_min
40
30
20
10
0
25 20 15
Max heating
requirement
T_out_max
T_CH_Low
10 5 0 -5
Outside temperature (°C)
-10 -15 -20