perhaps explain your whole zone setup, then someone could advise what to do

I have a double doors at the back where I would like to wire double door contacts. Currently I have one pir in the living room and I would like to wire second because of the length of the room and the RSJ in the middle of the room.

Currently have following zone setup

Z1 front door contact

Z2 back door contact. Now double doors

Z3 kitchen pir

Z4 living room pir now extended

Z5 passage pir

Z6 bedroom 1 pir

Z7 bedroom 2 pir

Z8 panic button

I would like to double up zone 2 and 4

Edited March 6, 201511 yr by Vick

In reality the panic button would be unlikely to be used ime, is it a bungalow?

Also let us see a floor plan showing doors and windows please.

The living room must be huge then, pir's usually have quite a decent range.

It's not a bungalow living room is 10.5 meters long

Edited March 6, 201511 yr by Vick

One should cover that, may have to replace it if it's an old 'en though.

Assuming no real obstructions to the room.

There is obstruction on middle of the room where the current extension is being built. It has RSJ and two side walls entrance to the extension is open. Does not have a door in middle. Pir does not trigger until coming to middle of the room

There is obstruction on middle of the room where the current extension is being built. It has RSJ and two side walls entrance to the extension is open. Does not have a door in middle. Pir does not trigger until coming to middle of the room

OK then, the 2 bedrooms, are they on the 1st floor and if so any flat roofs or other means of access? Are there any safes valuables in them?

Two bedrooms are on the first Floor. Extension has a pitch single storey roof. Just connect below the first floor bedroom windows

Makes more sense now now , does the manual show on how to wire up contacts in series

How does the door operate , overlapped or independently?

model of pir in room? Perhaps reposition it , replace it with a longer range pir ?