All rights reserved Page 12 of 33Filling water in the central heating loop Switch off the heat and circulation pumps at the main switch. Fill water into the central heating loop via the filler cock, Figure 5, item13, until the correct water pressure is achieved, Figure 5, item 17 The automatic vents on the heat tank, central heating loop, etc., areactivated automatically when water is added to the system. Add water to the system until the water pressure is correct. If the wa-ter pressure disappears entirely during filling, filling must be restartedright from the beginning. Restart the heat pump at the main switch.Dirt filters in central heating and ground source loopsImmediately after the heat pump has been commissioned, a certain amount of dirt can accumulatein both loops. The dirt filter is located in the central heating string and in the ground pipe string out-side the heat pump, as shown in Figure 5The filters must be checked and cleaned several times daily after installation of the heat pump untilthe filters remain clean. In normal operation of the heat pump, it should be sufficient to check thefilter twice a year.Cleaning the dirt filters: Switch off the heat pump at the main switch. Close the shut-off valves on each side of the filter. Pull out filter and rinse until clean. Replace the filter and open the shut-off valves. Then switch on theheat pump at the main switch.Maintenance and WarrantyThe heat pump must undergo appropriate service in accordance with applicable laws and regula-tions in order to keep the plant maintained in good condition and to fulfill demands on safety andenvironmental compliance. It is recommended that the owner / operator immediately after commis-sioning of the facility shall consult with a qualified service technician about the scope andfrequency of servicing.The responsibility for maintenance of the heat pump is for the owner’s / user’s. Geothermal circuitcontaining coolant that can harm groundwater by leakage. Immediately contact a qualified servicetechnician by suspected leaks in your geothermal system.The installer of heat pump is obliged to provide an assurance to the owner / operator in accord-ance with applicable laws and regulations. For specific warranty terms refer to the owner / useragreement with his supplier.A prerequisite for warranty obligation is that servicing and maintenance is carried out as described.