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Wiring a new D2 thermostat?

Discuss Wiring a new D2 thermostat? in the Central Heating Systems area at ElectriciansForums.net

W

waynew

DIY
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May 24, 2022
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TL;DR
This is my old thermostat and I'm trying to connect to a new D2 model but not sure with there being 4 wires. Wasnt expecting a yellow wire??

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Red A
Yellow B
Blue (neutral) not required in the new thermostat.
The old thermostat has an accelerator to improve accuracy, which needed a neutral conductor.
The new thermostat does not have this feature.
Connect the blue into a connector block and tuck it out of the way.
 
Ok.
loz2754 said:
Red A
Yellow B
Blue (neutral) not required in the new thermostat.
The old thermostat has an accelerator to improve accuracy, which needed a neutral conductor.
The new thermostat does not have this feature.
Connect the blue into a connector block and tuck it out of the way.
Click to expand...

loz2754 said:
Red A
Yellow B
Blue (neutral) not required in the new thermostat.
The old thermostat has an accelerator to improve accuracy, which needed a neutral conductor.
The new thermostat does not have this feature.
Connect the blue into a connector block and tuck it out of the way.
Click to expand...
So A would be red, B would be yellow, and would I put the earth in C or just snip that off as it wouldn't be needed?.
I am trying to upload photos but with no luck at the moment..
loz2754 said:
Red A
Yellow B
Blue (neutral) not required in the new thermostat.
The old thermostat has an accelerator to improve accuracy, which needed a neutral conductor.
The new thermostat does not have this feature.
Connect the blue into a connector block and tuck it out of the way.
Click to expand...

loz2754 said:
Red A
Yellow B
Blue (neutral) not required in the new thermostat.
The old thermostat has an accelerator to improve accuracy, which needed a neutral conductor.
The new thermostat does not have this feature.
Connect the blue into a connector block and tuck it out of the way.
Click to expand...
So A would be red, B would be yellow, and would I put the earth in C or just snip that off as it wouldn't be needed?.
I am trying to upload photos but with no luck at the moment..
 
Don't snip the earth, as it may be needed in future. It should be sleeved green and yellow and terminated in a connector block.
DO NOT connect anything into C, unless you want to hear a bang!
 
loz2754 said:
Red A
Yellow B
Blue (neutral) not required in the new thermostat.
The old thermostat has an accelerator to improve accuracy, which needed a neutral conductor.
The new thermostat does not have this feature.
Connect the blue into a connector block and tuck it out of the way.
Click to expand...
both wired as stated but not getting no response from the boiler!. Turned the thermostat up to 24 degrees just to make sure and still nothing.
Any ideas??
Just to add, boiler works fine when heating hot water.
 

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