9.2 Domestic water system settings

The heat pump produces domestic hot water by using change-over valve control. When the domestic water request is activated, the change-over valve turns to domestic water accumulator and charging starts. The heat pump charges the domestic water by the setpoint and returns to the heating position. If heating is active, the charging continues to heat the property.

The domestic water accumulator has two temperature sensors: B2 at the top section is the measuring sensor and sensor B3 below it is the control sensor. The charging of domestic water is started when the value measured by sensor B3 is lower than the difference between the setpoint and charging hysteresis. Charging ends when the setpoint is reached.

In the Domestic hot water menu, you can view the following information:

  • Status: charging status of domestic hot water

  • DHW operating mode: selected operating mode

  • Top temp. tank: temperature at the top section of the domestic water accumulator (sensor B2)

  • Bottom temp. tank: temperature at the bottom section of the domestic water accumulator (sensor B3)

  • Change-over valve: control position of the change-over valve

  • Circulation pump: status of the domestic water circulator pump.

Domestic water setpoints

You can set a functional stop point for two different domestic water operating modes: Comfort is the basic level of domestic water, and Reduced is the reduced level of domestic water.

The controller changes the operating mode according to the time control set in the weekly calendar. By default, the heat pump operates at the Comfort level.

Legionella function

The Legionella function raises the temperature of the water in the domestic water accumulator to the set temperature with the electric heater once a week. This prevents the growth of Legionella bacteria in the domestic water. Set the function to a time when there is presumed to be no load (consumption) of domestic water.

  • Setp.temperature: temperature to which the heat pump charges the domestic water (factory setting 55 °C)

  • Legionella mode: weekday when the charging takes place

  • Start time leg.function: time of day when charging starts.

Parent topic: Heat pump settings