my old drayton thermostat has numbers by the terminals, they are 1, 2 , and 4 and an earth terminal. The wiring diagram on my new one has 1(call), 2(sat) and com. does this mean 1 and 2 in both thermostats are the same conections and 4 is equal to com. earth is intergril as i was kindly told last night. help in this matter would be great.
