Hi , i've got to connect a he35 tomorrow and the guy i'm doing it for has lost all the documentation, i know that the permanent live goes to l3 but he also has a room stat that he wants fitted , i have a 3core from the stat to the boiler but dont know what terminations to connect them to (does the neutral go with the main neutral and the other 2 go to l1 & l2 ) he's also talking about a programmer, can i fit anyone and again what gets conected where. thanks in advance for any help it's greatly appreciated.