I'm currently looking to change my central heating thermostat. At present i have a Honeywell T40 and was looking to replace it with a thermostat with a digital temperature readout. I have been looking around and a Heatmiser DS1-L looks to fit what i'm looking for. I also have a Siemens RWB29 2 channel programmer for the boiler so i don't think a programmable thermostat is necessary.
The T40 seams to be very inaccurate at maintaining heat in the living room where it is. Sometimes it feels like its got a 5 degree switching differential and can be slow to respond to heat changes in the room.
Fist of all, would the RWB29 be a suitable replacement for the T40?
Secondly, if it is suitable, i have been looking at the manual for the RWV29 and comparing the wireing to what i currently have in the T40, pictured bellow
The manual for the RWB29 who2w 2 options, Volt free and 23v switching mode.
Would i be using the 230v Switching mode?
Am i interpreting it correctly that i would need to add a small jumper cable to bridge between A1 and L?
Is anyone able to give me a simple guide on how to switch the wires from the T40 into the RWB29 please?
Thank you all in advance for your time,
Paul