Vaillant geoTHERM Installation Instructions Manual

Also see for geoTHERM SERIES: System Installation Instructions Installation and servicing Instructions for use Operating instructions

Contents

Electrical installation44 Installation instructions geoTHERM 0020051574_0477 Electrical installatione Danger!Risk of electric shock!> Always switch off the power supply to allcircuits before carrying out any electricalinstallation work.> Check that there is no voltage.> Make sure that the power supply issecured against being inadvertentlyswitched on again.b Caution!Risk of damage caused by improper elec-trical installation.The electrical installation must only be car-ried out by an approved qualified electri-cian.> Carry out the described installation workcorrectly.b Caution!Risk of damage caused by an inadequateseparator.You must be able to switch off the electricalconnection using an on-site, three-pole,adjustable separator with a contact openingof at least 3 mm (e. g. circuit breaker). Theseparator must provide coupled fuses sothat all other fuses also switch off if onefuse drops.> Ensure that a corresponding separator isavailable on site.b Caution!Risk of short circuits!If lines longer than 30 mm are stripped,short circuits may occur on the PCB if thelines are correctly secured in the plug.> Strip the 230 V lines in order to connectto the ProE plug. For safety reasons, donot strip the lines to any more than30 mm and ensure that they are securein the plug.b Caution!Risk of malfunction due to improper run-ning of lines.The lines for the external sensor, eBUS androom thermostat carry low voltages. Envi-ronmental interferences may affect thesensor lines and send incorrect informationto the heat pump controller.> Lay low-voltage lines, such as sensorlines, on-site in the building so that theyare a suitable distance from the powerlines. If low-voltage lines and mains volt-age lines are laid in parallel, a minimumclearance of 25 cm applies for a lengthof 10 m.7.1 Observing the installation instructions> Use the values for the maximum rated power that arespecified in the technical data to determine the requiredline cross sections .> In each case, take into consideration the on-site installa-tion conditions.> Install the heat pump using a secure mains connection.> Install the separator right next to the heat pump.> For the electricity supply, connect the heat pump to athree-phase 400 V power system with a neutral line andan earth line.> Fuse this connection using the exact values that arespecified in the technical data (¬ Tab. 14.1 or ¬ Tab. 14.2).> Connect an external, heating circuit pump (to be fittedon-site) with Imax = 2 A and Umax = 230 V. If these valuesare exceeded, install a relay/circuit breaker that is to befitted on-site and switch the pump using this.> If the local power company requires that the heat pumpis controlled using a blocking signal, fit a correspondingcontact switch as prescribed by the power company(¬ Ch. 7.3.2).> Ensure that the sensor lines, e. g. VRC DCF receiver, donot exceed the maximum line length of 50 m.> Guide supply lines with mains voltage separately fromsensor or bus lines from a length of 10 m. If this is notpossible, use shielded lines. Lay the shielding on one sideof the sheet for the heat pump’s switchbox.> Do not use free terminals on the heat pump as base ter-minals for further wiring.i You can find an overview of the complete elec-trical circuit diagram in (¬ Ch. 17).