Myson Thermostat Mrt1 and Nest E Thermostat replacement

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Hi
Looking for advice on how to replace and label the wires
on the Myson MRT1 Thermostat to wire on a Nest 3rd generation thermostat. Looks like 3 wires as I think the brown at T3/4 snakes around back of grey wire to T1.

Thanks in advance

myrton thermostat.jpg
 
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It's not quite that simple - you need to find the wiring centre in your airing cupboard, or the programmer if you have a combi boiler, and wire the Heat Link into there
 
Do you have any other controls like a timer or programmer somewhere ?
 
Hi
Sorry but it looks like I listed the wrong Nest product and its the Nest E thermostat. It looks like the heatlink is connected to the thermostat wire and the thermostat plugs in to the wall via a usb charger. I have a programmer old fashioned dial timer attached to the boiler.
Sorry for posting wrong info as its a freebie I am getting from a friend - still to get it
 
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Left hand terminal 4 is neutral and not used with Nest e and needs to go into a bit of terminal block. Only 1 and 3 are used, as this shows
145870-smart-home-review-hands-on-nest-thermostat-e-initial-review-image16-irgcqenlqw.jpg
only two wires are used with on/off control.
 
The old dial timer will need to be set so as to be permanently 'on' 24/7, otherwise it will interfere with the operation of the Nest-e.

Nest-e incorporates both time and temperature control in a single unit.
 

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