got a new twin immersion unvented direct cylinder and customer wants to use economy 7 for heating through the night on the bottom immersion and another circuit for boost as needed on the top immersion. got a horstmann electronic 7 programmer and connected up but it keeps tripping the rcd when the boost switch fused spur is turned on. the E7 and the normal heating circuit come from 2 seperate CU's and are both on rcds and then go to their own switch fused spurs and then into into the horstmann 7. the lives from the fused spur both go into one terminal on the horstmann and it seems that its sending current down the switched off economy 7 circuit and tripping. the manual says that it is compatible with economy 7 but not sure how this setup would work? any ideas?
cheers Si
cheers Si