3.3 Heating functions

The heat pump charges the domestic hot water to the domestic water accumulator using the change-over valve (Q3). The domestic water accumulator has two temperature sensors that control the charging process.

The measurement (B2) at the top of the accumulator indicates the temperature of the domestic water and the functional sensor (B3) at the bottom turns the charging process on and off. The domestic water temperature is set to the heat pump’s controller via the Gebwell Smart Control Hub, application or controller. Based on the set temperature, the heat pump produces domestic water for the accumulator.

This selection affects the amount of domestic hot water. When the set value is 55 or more, the heat pump also uses an electric heater to heat domestic hot water.

The heat pump produces heating water directly into the building’s heating network. Automatic adjustment determines the setpoint for the supply water from the heating circuit based on the set heating curve and the outdoor temperature measurement.

The controller uses the supply water setpoint to determine the heat pump setpoint, based on which the heat pump produces heating energy and keeps the temperature of the supply water at the setpoint. The room temperature sensor also affects the setpoint.

In order for the heat pump to operate at maximum efficiency, the heating system and the brine circuit must be under ideal conditions. The difference between the heating system’s output and return temperatures must be 5–8 °C, and the difference between the collector’s output and return temperatures must be 3–4 °C. If the temperature differences deviate from these values, the efficiency will decrease, along with the savings. The heat pump controller controls the charge and source pumps to achieve the desired temperature difference.

Factory settings:

• Heating temperature difference: 5 °C

• Preparation of domestic water: pressure control

• Collector temperature difference: 3.5 °C