Heating-cooling relay, 1+1 normally open, potential-free, 4A/250V AC, with DX technology. Bidirectional. Standby loss is only 0.1 watts. Connection to the Eltako RS485 bus. Cross-wiring of bus and power supply with a jumper. Simply connect the neutral conductor to terminal (N1) and live to 1(L) and/or neutral to (N2) and live to 3(L). This results in an additional standby loss of only 0.1 watts. When both relays of the FHK14 are activated, 0.4 watts are required. In case of power supply failure, it is defined to switch off. This heating-cooling relay evaluates the information from wireless temperature controllers or sensors, possibly supplemented by window-door contacts, motion detectors, window handle sensors FFG7B-rw, and wireless buttons. As an alternative to a wireless temperature controller, temperature information can also be obtained from the GFVS software based on set and actual values. Additionally, there is the option to set the desired temperature via the GFVS software, thereby restricting the adjustment range of the wireless temperature controllers.