6.4 Heat supply circuit

The heating system adjusts the indoor temperature using the heat pump controller and a secondary circuit, such as radiators, underfloor heating, ventilation or convector fans.

• Before installing the heat pump, rinse the pipe network in the building’s heating system to remove any impurities that may remain after installation.
• Install the required protective devices, strainer, shut-off and non-return valves. The shut-off valves must be installed as close to the heat pump as possible.
• It is advisable to install the heat pump in a closed heating system with a diaphragm expansion tank.
• Make sure that the top of the heat pump and the electrical equipment are entirely free of water during operation.

• Protect the heat pump from overpressure with a safety valve. The opening pressure of the safety valve can be a maximum of 0.6 MPa (6.0 bar), and it should be installed in the return pipe of the heating system.

  It is advisable to lead the safety valve overflow pipe to the nearest floor drain. The overflow pipe should be installed in such a way that water is able to flow out of the overflow pipe unobstructed. Do not plug the safety valve.

• If you connect the heat pump to the heating system without a buffer tank, take the minimum flow rate required by the heat pump in a system equipped with thermostats into account. Check the device-specific minimum flow rate in section Technical specifications.