The RTD-W is a monitoring and control interface for Altherma HT hydroboxes (heating only and reversible), small inverter chillers (EWA/YQ16..64 series) and VRV heating only hydrobox. The interface is compatible with all units that are operated using a BRC21 (EKRUAHTA/EKRUAHTB) remote controller network connection and allows control of up to 16 units in a single group.
*Note that units supplied with ARC448 remote controllers are not compatible with the RTD-W. EWA/YQ6-11 series are compatible to the RTD-W if they are operated with BRC21 remote controllers.