Help needed replacing Honeywell T40 with DT90

[AlvinMartin]

Hello,

Would appreciate some help with the wiring of my new Honeywell DT90. The old T40

The old unit has 4-wires; It has an Earth, a grey cable wired into 2, Black to 3 and Brown to 1.

View media item 38426 View media item 38428
On the new device, there is no earth (so I assume I can just seal off the earth cable), and A, B & C connections.

I'm not entirely sure how to map the grey, black & brown wires to A, B & C.

View media item 38427
Some photos are attached. Advice gratefully received.

Thanks

 

[matt1e]

brown to A
black to B
nothing to C
grey not used so put in a connector to make safe
Earth not used so also make safe as per the grey above

Matt