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Replacing a Drayton Wall Mounted Thermostat with an ESI Equivilant

Postby headpaul679 » Fri Dec 09, 2016 9:31 am

Hi All,

My first post so please be gentle.

I have a drayton thermostat on the wall at home, and i think it is behaving erratically, so i decided to replace it. (IMAGE ON WALL)

I have bought an ESI thermostat (ES-RTE/VF (Volt free heating / cooling change over thermostat)

After opening the existing drayton thermostat i can see three wires
Blue wire linked to N
Red wire linked to L
Black wire linked to '3'

The fitting instruction for the ESI thermostat state to link the wires as follows:

N (I assume Blue wire as before?)
L 230V AC 50Hz fused 3A (I assume Red wire as before?)
1 - COM
2 - heating satisfied or call for cooling
3 - Call for heat. (I assume Black wire as before?).

However, the new thermostat already has a brown wire connecting L & 1.

My query relates to this additional wire already connecting L &1.
This wasn't present before, and i am not sure why?

Am I right in thinking this is a straight swap, or do I need to do something else?

There is an alternative thermostat ES-RTE which only has wiring for N, L & call for heat 3. Should i have bought this one instead to do a straight swap?

Thanks for any help offered

thermo new.jpg
old 2.jpg
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