Vaillant 20017897 20017897

VR 34 modulating bus coupler for transmitting a 0...10 volt input signal (external control) for installation in the electronic box, wall-mounted housing (ET 0020051404) if required. Can be used for EcoCraft exclusive, ECOTEC exclusive, ECOTEC plus VC 146, 306, ECOTEC plus/1-5, ecoVIT, ecoVIT exclusive, icoVIT exclusive Note: Only for use with Vaillant heaters with EBus electronics. Not possible with Vaillant heat pumps.

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