DIY Forum


Ultimate HandymanUltimate Handyman on Pinterest


DIY Forum/Home improvement advice forum




It is currently Fri Feb 22, 2019 2:26 pm

Time zone: Europe/London



Post new topic Reply to topic  [ 3 posts ] 
Author Message
PostPosted: Tue May 15, 2018 9:37 pm 
Newly registered Member

Joined: Tue May 15, 2018 9:35 pm
Posts: 1
Has thanked: 0 times
Been thanked: 0 times
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?

Share on FacebookShare on TwitterShare on DiggShare on DeliciousShare on Google+
Reply with quote  
PostPosted: Fri May 18, 2018 4:53 am 
Senior Member
User avatar

Joined: Fri Feb 26, 2010 11:16 am
Posts: 1822
Location: Camberley Surrey
Has thanked: 106 times
Been thanked: 303 times
: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.

Reply with quote  
PostPosted: Fri May 18, 2018 8:46 am 
Senior Member

Joined: Mon Apr 13, 2009 8:03 pm
Posts: 6990
Has thanked: 840 times
Been thanked: 940 times
Yes, as you say, set ch to on 24hrs and let the cm907 do the switching.


Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 



Similar topics

Time zone: Europe/London

Who is online

Users browsing this forum: No registered users and 0 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Visit Solent plastics




News News Site map Site map SitemapIndex SitemapIndex RSS Feed RSS Feed Channel list Channel list
ultimatehandyman privacy policy



Powered by phpBB® Forum Software © phpBB Group