Wiring on a Honeywell dt90e Thermostat to Replace old Manual Dial


Postby bobthompson1 » Mon Oct 08, 2018 7:31 pm

I have a manual dial thermostat that I want to change to a Honeywell dt90e the wiring is as follows red to No1 yellow/green to no3 blue to no4 is it possible they have used the earth wire as the switched live as the blue is the neutral
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Postby Mr White » Mon Oct 08, 2018 9:51 pm

From your description it does sound like it. Are you sure it is yellow / green not just yellow?
If it is the earth core, it is dangerous and should be corrected.
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Postby bobthompson1 » Tue Oct 09, 2018 9:29 am

Definitely green and yellow it does look like it's sleeved. on the dt90e you do not need a neutral if I marked it appropriately could I use the blue wire as the switched live
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Postby Mr White » Tue Oct 09, 2018 7:06 pm

So long as the earth is used for its correct purpose, any of the other cores can be used for any purpose so long as they are tagged / marked at both ends.
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Postby bobthompson1 » Wed Oct 10, 2018 5:24 am

Thanks will have another look at it
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