Need Help Replacing old Honeywell Dial Thermostat With new Honetwell DT90E


Postby reddwarfcrew » Sat Mar 28, 2015 11:29 am

Hi, I'm replacing an old honeywell dial thermostat (T6360B) with the DT90E.

The old one surprisingly has 4 wires:

Yellow/Green to earth
Brown to T1
Grey to T2
Black to T3

The DT90E has A/B/C terminals. Can someone help with which 3 wires go where and which is redundant.

Thanks for any help.

Pics attached.
Attachments
New Thermostat.jpg
New Thermostat diagram
Old Thermostat 2.jpg
Old Thermostat diagram
Old Thermostat 1.jpg
Old Thermostat wiring
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Postby proptech » Sat Mar 28, 2015 7:47 pm

Hi
Your new stat does not need a neutral or an earth. So make the grey and the green/yellow safe within the housing. Connect the brown to A, and the black to B.
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