Replacing one Drayton LP722 with another

[Calculus]

I want to replace a Drayton LP722 with a better one (model 25476 with 3 time periods per day rather than 2). I have been told it's just a matter of undoing the two screws at the bottom, lifting the old one off and putting the new one on, and tightening the screws. Can someone clear up the confusion I have about the 'backplate'? Is the backplate the hinged black plastic square (second pic, showing replacement) or something else, already fitted behind the old timer? When I pull the old one off does the equivalent backplate come off with it? I'm not touching the screwdriver until I know....

 

[jj4091]

It will probably need pairing with the the reciever as long as it is compatible.

 

[denso13]

Is the backplate the hinged black plastic square (second pic, showing replacement) or something else, already fitted behind the old timer? When I pull the old one off does the equivalent backplate come off with it?

Yes, backplate is fixed to the wall, it won't come of with the programmer, just pull out and lift up to remove.

 

[denso13]

It will probably need pairing with the the reciever as long as it is compatible.

No receiver, it isn't wireless.

 

[Calculus]

Thanks denso13, the talk of pairing and receivers sent me into a panic!