You can wire a 240vac or a 24v enable into the RTH converter (78079). For the 240vac enable firstly locate the 240vac 3pin connecter block inside the RTH converter marked with 1, 2 and 3 connections, 1 = Switch Live Connection, 2 = Neutral Connection and 3 = Is Not Used. The 24v enable is also possible when wired into the 24vac connector, this is done by removing the link from 1 and 2 and wiring in your 24v controller into those same connections, these are not polarity sensitive connectors.