I have an old RTS1 thermostat with wires at N (blue) L(brown) and 3 (green). I wish to replace it with an ESRTP4 (NOT wireless). I assume that I should wire the Blue to 1, Green to 2 and Brown to 3 but I need some assurance. Can you help, please?
Brown (live) to Com (2), Green (if it is green) to NO (3). Whatever the colour of your number 3 in existing Drayton - sleeve it brown, or apply brown insulation tape to show it’s being used as a live. Park the Neutral (blue) in terminal strip block (chock block).