Adapting the appliance to the heating systemInstallation instructions geoTHERM 0020051574_04 819Display shown Description Factory settingAuxiliary heater C7Aux on peak rate >NOAux on during CH no CHAux on during DHW no CHAux heater on at -600° min>Select ¯Aux on peak rate: If you set wiring diagram 2, thismenu item also appears in the top line. If youset “YES”, auxiliary heating operation is enabledduring the aux. on peak rate.i This setting has precedence over the set-tings for “Aux on during CH” and “Aux onduring DHW”. The set auxiliary heatingpermanently ensures the heating up of theheating water and hot water up to the settarget values.If the internal additional electric heatinghas been hydraulically integrated as auxil-iary heating (factory setting), this maylead to high energy costs. (Not applicablefor VWS/VWW ..0/2)NOAuxiliary heater C7Hysteresis aux. heating. 5 K>SelectAuxiliary heating hysteresis:Forced switching on of the auxiliary heating if:Actual flow temperature < target flow tempera-ture minus hysteresisForced switching off of the auxiliary heating if:Actual flow temperature > target flow tempera-ture plus hysteresisAfter 15 minutes, compressor mode applies forall system hydraulics. The amount of time untilthe auxiliary heating can start can be read fromMenu D3.5 KCooling C8Flow temperature 22 °CCooling Hours>SelectOnly if external passive cooling is installed,VWS only:Flow temperature: Display of target flow tempera-ture. The value can be changed.b Caution:Risk of damage caused by fall intemperature below thawing pointand formation of condensation.Adequate cooling is guaranteed evenat a cooling mode flow temperature of20 °C.> Do not set the cooling mode flowtemperature too low.Cooling Hours: Brine pump operating hours in coolingmode.20°C9.6. Menu C: Set parameters for the heating system
