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

6 Start-up24 Installation instructions aroTHERM 0020147164_076.11 Operating noises"Hhmmm..." (*)"Ttsheeh...!""Eeee..."“Clink!""Chug, chug,chug,...""Whirr..." (*)123456* Permanent operatingnoisesThe noises listed do not constitute a fault with the heatpump.In various operating modes, the noises come from the heatpump (Start, Thawing, Stop).6.12 Adjusting the heating circuit6.12.1 Purging the heating circuitConditions: SW10 open-end spanner▶ Connect one end of the hose to the purging valve.▶ In order to collect the residual glycol when purging theheating circuit, insert the other end of the hose into themixing container.▶ Close the stop valves on the back of the product.▶ Increase the pressure in the heating circuit.▶ Open the purging valve with an open-end spanner.▶ Open the lower stop valve on the back of the product.▶ If liquid escapes from the pipe, close the purging valve.▶ Repeat the work steps for all hydraulic circuits by chan-ging the direction of the 3-way valve.▶ Check the pressure in the heating circuit. If necessary,increase it.– Operating pressure: 0.15 … 0.2 MPa (1.50… 2.0 bar)▶ Open the service valves on the back of the product.▶ Remove the hose and the mixing container.NoteThe system controller has a purging func-tion. The purging function can be started viathe heat pump's control module. Within 15minutes, the pumps are switched on for aperiod of 30 seconds and switched off again(30 seconds).6.12.1.1 Available pressure in the heat pumpheating circuitAB010203040506070805000 1000 1500 2000C10020030040050060070080090 900250032141 VWL 55/2 A 230 V(water temperature 20°C)2 VWL 85/2 A 230 V(water temperature 20°C)3 VWL 115/2 A 230 V(water temperature 20°C)4 VWL 155/2 A 230 V(water temperature 20°C)A Remaining feed head(kPa)B Flow rate (l/h)C Remaining feed head[mbar]6.12.2 Adjusting the heating circuit flow rateCaution.Risk of material damage due to frostIf the minimum flow rate is too low, the heatexchanger may become damaged by frost.▶ Operate the product with a sufficient flowrate (see table).The product is designed for operation between the minimumflow rate and maximum flow rate, as specified in the table. Ifthe product is operated with the minimum flow rate, this res-ults in a loss of energy and efficiency. The heating comfort isstill guaranteed but the energy savings are reduced.VWL 55/2 VWL 85/2 VWL 115/2 VWL 155/2Minimumflow rate380 l/h 380 l/h 540 l/h 1,200 l/hMaximumflow rate860 l/h 1,400 l/h 1,900 l/h 2,590 l/h