Honeywell DT90E - how to wire up?

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Berkshire
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Have a ariston boiler system boiler.
Drayton RTS1 room stat and a drayton Lifestyle LP112 programmer.

I want to replace the RTS1 with the honeywell DT90E - I believe the system uses a neutral to switch @240 mains also in conjunction with this lifestyle timer.

So do I need all 3 wires to new Honeywell or can I just use 2?

The DT90E supports mains and low voltage so I just want to know wats the best method of doing of this please?

PS- some posts regading this are unclear with regards to my scenario so apologies to those who have supported this issue more than once!.
 
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Just use the live in and live out . DONOT use the neutral disconnect it at both ends
 
Just use the live in and live out . DONOT use the neutral disconnect it at both ends

Thanks for the info, can i make the neutral at stat side"safe" and leave the other side connected, simply as i do not want to open up the junction box its all wired up too.

Thanks
 
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