Hi All, replacing an old rotary room thermostat with a Honeywell DT90E. Wiring diagrams are a confusing so thought I would ask here.
Old thermostat had a permanent live (yellow), switched live (switched by the thermostat -red), neutral (blue) and earth (green sheathed)
The DT90e is a two wire stat but it has three terminals as follows
A marked live in
B seems to be a neutral
C seems to be the internal thermostat switch
Any advice which of my four wires go where please?