Vaillant VWL 57/5 IS Operating, Installation And Maintenance Instructions

Also see for VWL 105/5 AS S2: Operating instructions Operating instructions Operating instructions

Contents

Draining 120020257319_02 Hydraulic station Installation and maintenance instructions 4111.4 Observing inspection and maintenanceintervals▶ Use the "Inspection and maintenance work" table in theappendix.▶ Adhere to the minimum inspection and maintenance in-tervals. Carry out all of the work that is mentioned.▶ Carry out maintenance work on the product at an earlierpoint if the results of the inspection that was carried outduring previous maintenance make this necessary.11.5 Preparing for inspection and maintenanceObserve the basic safety rules before carrying out inspectionand maintenance work or installing spare parts.▶ Switch off the product.▶ Disconnect the product from the power supply.▶ Secure the product against being switched back onagain.▶ When working on the product, protect all electric com-ponents from spraying water.▶ Remove the front casing.11.6 Checking the admission pressure of theexpansion vessel11. Close the service valves and drain the heating circuit.(→ Page 41)2. Measure the pre-charge pressure of the expansion ves-sel (1) at the valve (2).Result:NoteThe required pre-charge pressure of theheating installation may vary dependingon the static pressure (0.1 bar per metre inheight).Pre-charge pressure is below 0.75 bar (±0.1 bar/m)▶ Fill the expansion vessel with nitrogen. If nitrogen isnot available, use air.3. Fill the heating circuit. (→ Page 35)11.7 Checking and correcting the filling pressureof the heating installationIf the filling pressure falls below the minimum pressure, amaintenance message is shown on the display.– Min. heating circuit pressure: ≥ 0.05 MPa (≥ 0.50 bar)▶ Top up the heating water in order to start up the heatpump again; Filling and purging the heating installation(→ Page 35).▶ If you notice frequent pressure losses, determine andeliminate the cause.11.8 Checking the high-pressure switch-off▶ Start check programme P.29 High pressure.◁ The compressor starts and the flow rate monitoringfor the pump is deactivated.▶ Block the heating circuit.◁ The product is switched off by the high-pressureswitch-off.11.9 Completing inspection and maintenanceWarning.Risk of burns due to hot and cold com-ponents.There is a risk of burns from any uninsu-lated pipelines and from the electric back-up heater.▶ Before starting up the unit, install any cas-ing sections that have been removed.1. Start up the heat pump system.2. Check that the heat pump system is working withoutany problems.12 Draining12.1 Draining the product's heating circuit1. Close the service valves in the heating flow and in theheating return.2. Remove the front casing. (→ Page 25)13. Connect a hose to the filling device (1) and guide thefree end of the hose to a suitable drainage point.