AndyKent
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Registered: 3rd Sep 05
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I've got a crappy old thermostat in my new place but want something better with more controls and wireless. I found this which'll do exactly what I want - http://www.plumbnation.co.uk/site/honeywell-cmt927-wireless-7-day-programmable-room-thermostat/
I'll obviously have to remove the existing thermostat and put the reciever in its place.
Not being electrically minded, is this simple?
This is what I have now - http://www.flickr.com/photos/41580503@N02/5387516934/
This is how its wired at the moment - http://www.flickr.com/photos/41580503@N02/5387516432/
And this is the back of the thermostat itself - http://www.flickr.com/photos/41580503@N02/5386912241/
Will it be as simple as just transferring the wiring over like for like?
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Gary
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Registered: 22nd Nov 06
Location: West Yorkshire
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Should be fella. If you get stuck post up teh connectors on the new one and im sure we can help
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mattk
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Registered: 27th Feb 06
Location: St. Helens
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yeah thats fine, on the new ones it doesnt even matter about the polarity
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deanmcreynolds26
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Registered: 15th Sep 03
Location: E46 //M3
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mind if your just doing it from the wires at the old stat that you need to keep your old timer on 24hr assuming that you have one at the boiler?
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AndyKent
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Registered: 3rd Sep 05
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Yeah, the boiler has the regular always on/timer thing.
I'll give it go. I've seen some thermostats running 2/3 cables into them which obviously present in my boiler, just the 1 triple core as in the picture.
If I can't go far wrong I'll get it ordered.
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jacko198
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Registered: 1st Mar 07
Location: Buckinghamshire
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We have them in work, neither good or bad 
Dont use it much so ive never set a timer on it or anything
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AndyKent
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Registered: 3rd Sep 05
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If there's anything better available I'm open to suggestions. Was pretty much the first Honeywell I came across with 7-day programming and around £100.
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dannymccann
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Registered: 9th Aug 06
Location: Doddington, Lincolnshire
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Thats a wireless one Andy, doesnt the box in background need wiring to the boiler? I had one of these in my old rental property, the wireless bit is good (has an inbuilt temp sensor for the room you keep it in, not where the sensor bit is)
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deanmcreynolds26
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Registered: 15th Sep 03
Location: E46 //M3
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http://cgi.ebay.co.uk/Drayton-RF701-Digistat-Wireless-Programmable-Thermostat-/180404344001?pt=UK_Home_Garden_Hearing_Cooling_Air&hash=item2a00efd4c1
we use these, i quite like them, although they are a cunt to setup some times!
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tom_simes
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Organiser: South Wales
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Registered: 12th Jan 05
Location: Undy, Newport Drives: Skoda Octavia vRS estate
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In my old flat we had a Honeywell timer unti with 7 day programming, including a 'holiday' mode so it would just come on for a couple of hours, or you could set it cleverly to come back on just a few hours before you came home (as long as the holiday was less than 7 days anyway :lol
It was very easy to set and manage, easy to change the clock etc on. It didn't have a built in thermostat, but I don't imagine it being much different to use.
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AndyKent
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Registered: 3rd Sep 05
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quote:
Originally posted by dannymccann
Thats a wireless one Andy, doesnt the box in background need wiring to the boiler? I had one of these in my old rental property, the wireless bit is good (has an inbuilt temp sensor for the room you keep it in, not where the sensor bit is)
Yep, thats what I was asking for help on.
Glad to hear a few people saying its a good bit of kit. Got my eye on one on ebay, otherwise will get it bought from Plumbnation.
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Rob_Quads
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Registered: 29th Mar 01
Location: southampton
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The box in the background doesn't have to go right next to the boiler. You could just replace your current one with the sender. If you can trace the wires back then you can obviously put it closer but it may be more work that its worth.
Wiring the new sensor -
Blue -> N (Neutral)
Brown -> L (Live feed for device)
Brown -> A (Live feed for boiler)
Black -> B (Boiler Trigger)
Its something we have been looking at geing to stop the house getting really cold when we are not there as it then takes so much effort to heat it back up.
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pow
Premium Member
Registered: 11th Sep 06
Location: Hazlemere, Buckinghamshire
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Be careful, these things operate at 230V's don't they
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AndyKent
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Registered: 3rd Sep 05
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See thats what confused me, barely knowing about electrics. I can connect up a wire easy enough, just which wire where. I suspect with the unit in front of me I could work it out but difficult to get my head round it.
On my photo I've got live (brown), earth (yellow/green), neutral (blue) and a random black. Preumably thats another live feed?
The wiring diagram with the linked thermostat/reciever doesn't mention earth at all - that can just be taped up I assume?
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Rob_Quads
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Registered: 29th Mar 01
Location: southampton
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You will need to disconnect the power to this as it is 230v!
The black in the picture is the power feed to the boiler to triger it.
The earth is not used - the instructions specifically say don't use a metal cage so the not used in this scenario.
IMO If you don't understand what the instructions and information you have then you should not be touching the electrics.
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AndyKent
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Registered: 3rd Sep 05
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A fair point maybe. Being only 4 wires I expected it to be a simple job, hence taking advice before deciding whether to do it alone or get someone in.
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pow
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Registered: 11th Sep 06
Location: Hazlemere, Buckinghamshire
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Yeah we wanted to move at Thermostat at work and just got someone in for 30 mins to do it in the end as it's fucking 230V and I don't want a jolt off that
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deanmcreynolds26
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Registered: 15th Sep 03
Location: E46 //M3
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If you get a Drayton wireless you only need to turn power off and change the start for the receiver leave all the wiring the way it is just now mate! Uses the same back plate!
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ash_corsa
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Registered: 15th Apr 04
Location: Shrewsbury
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Where is the current stat?
Why do you want a wireless one?
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AndyKent
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Registered: 3rd Sep 05
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Boiler is in my bathroom in it's own cup'd. Stat is in the cup'd right next to the boiler.
What happens at the moment is the boiler fires up, warms up the cup'd and a few minutes later then cuts out because the stat says it's up to temperature.
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ash_corsa
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Registered: 15th Apr 04
Location: Shrewsbury
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Yeah thats an awful place for a room stat, can see why your after a wireless one now.
Best thing to do is rip out the old one inc cable back to boiler.
Then wire the new one in next to the boiler. Ususally just need a 3 core and earth to the wireless box.
Just make sure its correctly isolated before you work on anything, if in doubt turn the main switch off.
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AndyKent
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Registered: 3rd Sep 05
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Fuck it, I'll buy it and see what the connections look like in the flesh. If I need to bung someone a few quid to fit it I will.
Cheers all 
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ash_corsa
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Registered: 15th Apr 04
Location: Shrewsbury
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The boiler should have local isolation anyway, usually a switch fused spur, knocking this off and removing the fuse will be adequate.
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AndyKent
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Registered: 3rd Sep 05
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Yep, switched spur for the boiler and all on it's own RCD protected circuit too
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whitter45
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Registered: 15th Nov 02
Location: Norton
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I have just replaced my thermostat for an LCD with program set back
Don't see the point in the wireless stuff
Becareful 230v also
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