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PostPosted: Tue May 15, 2018 9:37 pm 
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I'm thinking about swapping out my old dial Switchmaster room stat for a digital one. I have an open vented system with a Baxi Solo 24 HE boiler controlled by a Drayton 241 programmer which controls CH & HW separately.
I was thinking about going for a Honeywell DT90E which would just have the same function as I have now but have also noticed the CM907 programmable stat which appeals to me as I can set different temperatures at different times.
My question is as I already have the CH set on the timer, will there be any issue with running a programmable stat as well?
I would like the stat to change temp at different times but do not want to use the timer function if that makes sense? I.E the programmer CH is set to turn on between 6pm and 11 pm but would like the stat to set the heating at 18 degrees between 6 & 9 and 21 degrees between 9 & 11.
Could I leave the Drayton Programmer CH function 'on' all the time with the CM907 controlling when the boiler turns on, or would I need to set the programmer and the programmable stat BOTH to the same time to turn the heating on?


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PostPosted: Fri May 18, 2018 4:53 am 
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:welcomeuhm: These are 3 queries and Even if you have the wires necessary to run the CM 907 from the old Stat position you would effectively be putting 2 switches in series and so for the boiler to fire both controllers need to be in an on cycle and the room temperature below the set level.


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PostPosted: Fri May 18, 2018 8:46 am 
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Yes, as you say, set ch to on 24hrs and let the cm907 do the switching.

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