Beretta Power Plus Box 150, Руководство по установке, Страница: 39 / 60

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3
CH_Priority
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 tem-
perature 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.
3 5 Setting the DHW parameters
The following DHW parameters can be set:
1 Setpoint_DHW
DHW setpoint (parameter 2)
This is the production temperature for DHW.
The maximum limit is indicated by par. 8 (T_DHW_limit, pre-
set to 60°C).
Preset to 50°C.
2
DHW_Type
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.
3
DHW_Priority
DHW priority (parameter 9)
0 = Shifting priority A
The purpose of shifting priority function A is that the system
can also serve heating if the heating demand is low.
The system responds to the heating demand if:
(Setpoint_Ch - 50°C) < Temp_collettore < (Setpo
1°C)
Setpoint_Ch = Setpoint of the high or low temperature cir-
cuit depending on demand.
1 = Shifting priority B
The purpose of shifting priority function B is that the system
never stops the heating service for too much time.
The system responds to the heating demand if:
(SetpoT_Tank_extra) - 50°C < Temp_collettore <
(Setpoi T_tank_extra) + 1°C
T_tank_extra = Par. 10 = preset to 30°C.
2 = Absolute priority (only DHW service)
Preset to 0.
3 6 Heat control setting
1 Attenuation_High
HIGH TEMPERATURE circuit attenuation function
(parameter 21)
There are 2 cases:
- Fixed point operation Par. 14=0
- Operation with climatic control Par. 14=1.
FIXED POINT OPERATION, PAR. 14=0
With the high temperature circuit attenuation disabled,
Par21=0 when the high temperature circuit thermostat is
closed, the heating demand is activated. When opened,
the system turns off.
The Master control unit activates the high temperature cir-
cuit pump PZ1 and the system pump PZ2 (if parameter
P34=0).
On the Master control unit it is possible to set the high tem-
perature circuit setpoint, Setpoint_T_CH_High = Par. 1, pre-
set to 70°C and settable from 10°C to T_CH_high_limit=Par
17, which is in turn preset to 80°C. The setpoint used will be
the one set with parameter 1.
The burner is on when:
Manifold temperature <=Setpoint – ignition hysteresis.
Ignition hysteresis can be set, CH_High_hyst_on = Par. 19,
preset to 7°C, can be set between 0 and 20°C.
The Master control unit converts the heat demand into pow-
er demand for each slave control unit.
The burners are off when:
Manifold temperature >=Se shut-off hysteresis .
Shut-off hysteresis can be set (CH_High_Hyst_off=Par. 20,
preset to 3, can be set between 0 and 20°C).
With the high temperature circuit attenuation parameter,
Par. 21≠0, the high temperature thermostat contact is ig-
nored and a heat demand is present for the high tempera-
ture circuit when:
Manifold temperature <=Setpoint – ignition hysteresis
The heat demand stops when:
Manifold temperature >=Se shut-off hysteresis .
The setpoint in this case coincides with the value set for
parameter 1 (Setpoint_t_ch_high) if the high temperature
thermostat contact is closed, whereas it is calculated as
the value set for parameter 1 less the attenuation (Set-
point_t_ch_high-Attenuation_high) if the contact is open.
OPERATION WITH CLIMATIC CONTROL, PAR. 14=1
If the high temperature circuit attenuation is equal to 0 , At-
tenuation_high=Par. 21=0, its behaviour is the same as the
previous paragraph, with the exception that the setpoint is
calculated based on the outdoor temperature.