Thermostat Wiring Advice

[planemad]

Hi all

Looking to replace my old Sunvic TLM 2253 mechanical dial room thermostat with a new Honeywell DT90E.

My old stat is 3 wire, yellow, red, blue

Can you please advise me which connections to make to the new Honeywell?

http://www.honeywelluk.com/products/Temperature-Controls/Temperature-TPI-Control/DT90E/

http://www.tlc-direct.co.uk/Technical/DataSheets/Sunvic/TLM2253.pdf

 

[denso13]

Red to A, yellow to B, as blue not required it should be terminated safely. Assuming the old one was wired with red as live and yellow as switched live.