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

5 Hydraulics installation26 Installation and maintenance instructions Hydraulic station 0020257319_025 Hydraulics installationDanger!Risk of scalding and/or risk of materialdamage due to incorrect installation lead-ing to escaping water.Stresses in connection pipes can causeleaks.▶ Install the connection pipes such that theyare free from mechanical stress.Caution.Risk of material damage due to heat trans-fer during soldering.▶ Only solder connectors if the connectorsare not yet screwed to the service valves.5.1 Carrying out the installation preparations▶ Install the following components, preferably from themanufacturer's accessories:– An expansion relief valve, a stopcock and a mano-meter on the heating return– A domestic hot water safety group and a stopcock onthe cold water supply– A stopcock on the heating flow▶ Check whether the volume of the installed expansionvessel is sufficient for the heating system. If the volumeof the installed expansion vessel is insufficient, install anadditional expansion vessel, connected as close to theproduct as possible, in the heating return.▶ Flush the heating installation through thoroughly beforeconnecting the product in order to remove any residuewhich could be deposited in the product and lead to dam-age.▶ Check whether, when you open the catches on the refri-gerant pipes, you can hear a hissing sound (caused bya factory-side excess pressure of nitrogen). If you do notfind any excess pressure, check all of the screwed con-nections and pipes for leaks.▶ For heating installations with solenoid valves or thermo-statically controlled valves, install a bypass with bypassvalve in order to guarantee a volume flow of at least 40%.5.2 Routing refrigerant pipes1. Observe the information on handling refrigerant pipes inthe installation instructions for the outdoor unit.2. Route the refrigerant pipes from the wall duct to theproduct.3. Bend the pipes only once into their final position. Use abending spring or another suitable bending tool to avoidkinks.4. Secure the pipes to the wall using insulated wall brack-ets (cold insulation brackets).5.3 Connecting the refrigerant pipesDanger!Risk of injury and risk of environmentaldamage due to escaping refrigerant.Touching any escaping refrigerant maycause injury. Escaping refrigerant leadsto environmental damage if it reaches theatmosphere.▶ Only carry out work on the refrigerant cir-cuit if you have been trained to do so.121. Remove the flare nuts and the catches from the con-nections for the refrigerant pipes on the product.◁ An audible hissing sound (escaping nitrogen) showsthat the refrigerant circuit in the product is leak-tight.2. Apply a drop of flare oil to the outsides of the pipe endsin order to prevent the flare edge from breaking awaywhen tightening screwed connections.3. Connect the hot gas pipe (2). Use the product's flarenuts.Caution.Risk of damage to the refrigerant pipescaused by excessive tightening torque▶ Note that the following torques only referto flanged connections. The torques forSAE connections are lower.