Vaillant aroTHERM VWL ../2 A 230 V series Installation Instructions Manual

Notes on the documentation 20020147164_07 aroTHERM Installation instructions 72 Notes on the documentation2.1 Observing other applicable documents▶ You must observe all the operating and installation in-structions included with the system components.2.2 Storing documents▶ Pass these instructions and all other applicable docu-ments on to the system operator.2.3 Applicability of the instructionsThese instructions apply to units with the following type des-ignations and article numbers only:Type designation Art. no.aroTHERM VWL 55/2 A 230 V 0010014566aroTHERM VWL 85/2 A 230 V 0010011971aroTHERM VWL 115/2 A 230 V 0010011972aroTHERM VWL 155/2 A 230 V 0010014567The seventh to sixteenth digits of the serial number on theidentification plate form the article number.3 System overview3.1 Safety devices– The product can work at the following outside temperat-ures:VWL 55/2 A 230 V VWL 85/2 A 230 VVWL 115/2 A 230 VVWL 155/2 A 230 VHeating mode −15 … 28 ℃ −20 … 28 ℃Cylinder chargingmode−15 … 46 ℃ −20 … 46 ℃– If the product's refrigerant circuit pressure exceeds themaximum pressure of 4.15 MPa (41.5 bar), the high-pressure pressure switch switches the product off. Fol-lowing a waiting period, the product attempts to startonce more. After three failed start attempts in succes-sion, a fault message is displayed.– If the product is switched off, the crankcase housingheating is switched on when the compressor outlet tem-perature reaches 7 °C in order to prevent possible dam-age caused by switching it back on.– If the compressor inlet temperature and the compressoroutlet temperature are below 1 °C, the compressor doesnot start up.– A temperature sensor on the compressor outlet limits theproduct's operation if the measured temperature exceedsthe maximum permissible temperature. The maximumpermissible temperature depends on the evaporation andcondensation temperature.– The product measures the flow rate of the connectedheating circuit when starting up the product.– If the heating circuit temperature falls below 3 °C, theproduct's frost protection function is automatically ac-tivated as the heating pump is started. In addition, frostprotection agent should be added to the heating water asthe heating water temperature may fall below the freez-ing point in the event of a power cut, which poses a riskof frost to the heating installation.NoteOperating the heat pump outside the applicationlimits results in the heat pump being switched offby the internal control and safety devices.3.2 Design of the heat pump systemThe heat pump system consists of the following components:– aroTHERM heat pump– VWZ AI heat pump control module– Additional hydraulic components, if required– VRC 470 system controllerThe heat pump can be operated by the VWZ AI heat pumpcontrol module. The extended operation of the heat pump iscarried out by the system controller.3.3 FunctionalityThe product comprises the following circuits:– The coolant circuit releases heat into the heating circuitby means of evaporation, compression, condensationand expansion– The heating circuit3.3.1 Heating mode123 45 61 Evaporator2 4-way valve3 Fan4 Compressor5 Electronic expansionvalve6 Plate heat exchanger3.3.2 Thawing123 45 61 Evaporator 2 4-way valve