Setting The Domestic Hot Water Parameters - Beretta POWER PLUS Installation Instruction

Setting the Domestic Hot Water Parameters

The following functions can be set for the domestic hot water circuit:
1 Setpoint_DHW
Domestic hot water set point (parameter 2)
This is the temperature value for the production of domestic hot water.
The maximum limit is set by par. 8 (T_DHW_limit, pre-set to 60°C).
Pre-set to 50°C.
2 DHW_Type
Type of storage heater (parameter 6)
0 = No DHW service
1 = Rapid heat exchanger with probe
2 = Storage heater with probe
6 = Storage heater with thermostat
For the storage heater with thermostat, if the input is a closed contact, the domestic hot water demand is activated,
if it is an open contact the demand is no longer present.
Pre-set to 0.
3 DHW_Priority
Domestic hot water priority (parameter 9)
0 = Sliding priority A
The purpose of the sliding priority A function is to allow the system to also serve the central heating function when
the heating demand is low.
The system responds to the heating demand if:
(Setpoint_Ch - 50°C) < Manifold temp. < (Setpoint_Ch + 1°C)
Setpoint_Ch = Set point in the high or low temperature circuit, according to the demand.
1 = Sliding priority B
The purpose of the sliding priority B function is to ensure that the system does not stop the central heating service
for too long.
The system responds to the heating demand if:
(Setpoint_Dhw+T_Tank_extra) - 50°C < Manifold temp. < (Setpoint_Dhw+T_Tank_extra) + 1°C
T_tank_extra = Par. 10 = pre-set to 30°C.
2 = Absolute priority (DHW service only)
Pre-set to 0.
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