27
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.
9 .3 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.
If the outdoor temperature = Tout_min=Par. 37, preset to
0°C, then setpoint =setpoint_T_Ch_high.
If the outdoor temperature = Tout_max=Par. 38, preset
to 18°C, then setpoint T_ch_high_ foot=Par. 18, preset to
50°C.
The setpoint is calculated linearly between the 2 outdoor
temperature values.
Preset to 0.
2
Attenuation_Low
LOW TEMPERATURE circuit attenuation function
(parameter 25)
This paragraph is similar to the previous paragraph for the
low temperature circuit.
There are 2 cases:
- Fixed point operation Par. 22=0
- Operation with climatic control Par. 22=1.
FIXED POINT OPERATION, PAR. 22=0
With low temperature circuit attenuation disabled, Par.
25=0 at the closure of the low temperature circuit thermo-
stat, heating demand is activated. When opened, the sys-
tem turns off.
The Master control unit activates the low temperature cir-
cuit pump if the parameter for the third pump is set to 1
(P34=1).
On the Master control unit, it is possible to set the low tem-
perature circuit setpoint, Setpoint_T_CH_Low = Par. 3, pre-
set to 40°C and can be set between 10°C and T_CH_low_
limit=Par. 23, which in turn is preset to 50°C. The setpoint
used will be the one set with parameter 3.
Summary of Contents for Power Plus Box 1002 P INT
Page 1: ...Installation Manual CONDENSING Power Plus Box 1002 1003 1004 P INT EXT Installation Manual EN...
Page 36: ...36 12 WIRING DIAGRAMS...
Page 37: ...37 Valvola 2 vie Circolatore...
Page 42: ...42...
Page 43: ...43...
