We do not sell the RTX-AL4 PCB boards directly they are sold & supported exclusively through Daikin. They should be available from your local distributor for Daikin. Failing that you can get them from Daikin Germany.
Please note we do not sell directly as detailed above & we do not take any sales calls. We deal only with technical support queries, sales queries are done ONLY by email to our sales department at sales@realtime-controls.co.uk.