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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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central heating controls wiring
Dear All,
I had a Honeywell room thermostat which controlled the Alpha Combi boiler in the loft. I tried to replace it with a Drayton Digistat 3. It did not work. Can any one please expalin what is the meaning of the terms, call for heat, satisfied etc? What do thes wires do in real terms? When I put an ohm meter across the three terminals of the digistat, nothing happens as the programme calls for heat. Does this work by connecting terminal 1 to 3 or does it send a voltage signal? Can some please explain how the system works? thanks sam |
#2
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central heating controls wiring
"sarmavsn" wrote in message s.com... Dear All, I had a Honeywell room thermostat which controlled the Alpha Combi boiler in the loft. I tried to replace it with a Drayton Digistat 3. It did not work. Can any one please expalin what is the meaning of the terms, call for heat, satisfied etc? What do thes wires do in real terms? When I put an ohm meter across the three terminals of the digistat, nothing happens as the programme calls for heat. Does this work by connecting terminal 1 to 3 or does it send a voltage signal? Can some please explain how the system works? thanks sam http://content.honeywell.com/uk/homes/systems.htm should allow you to work out your problem. Peter |
#3
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central heating controls wiring
In article m,
sarmavsn wrote: I had a Honeywell room thermostat which controlled the Alpha Combi boiler in the loft. I tried to replace it with a Drayton Digistat 3. IIRC, these are available in both battery and mains versions. Which one have you? It did not work. Can any one please expalin what is the meaning of the terms, call for heat, satisfied etc? If you imagine a switch with an input but two outputs one of which is live and the other dead when the switch is 'off' and reverses when it is 'on'. That's what most thermostats have with the 'switch' operated by the thermostat. With the thermostat set to higher than ambient temperature one output becomes live and this is the call for heat sometimes marked 'on'. When the room temperature exceeds that of the thermostat the switch changes over and the call for heat becomes dead while the other (satisfied) output (can be marked off) becomes live. What do thes wires do in real terms? When I put an ohm meter across the three terminals of the digistat, nothing happens as the programme calls for heat. Does this work by connecting terminal 1 to 3 or does it send a voltage signal? Can some please explain how the system works? The top terminal is the common so has the live feed. Next down is the on, and the third off. -- *If you can't see my mirrors, I'm doing my hair* Dave Plowman London SW To e-mail, change noise into sound. |
#4
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central heating controls wiring
"sarmavsn" wrote in message s.com... Dear All, I had a Honeywell room thermostat which controlled the Alpha Combi boiler in the loft. I tried to replace it with a Drayton Digistat 3. It did not work. Can any one please expalin what is the meaning of the terms, call for heat, satisfied etc? What do thes wires do in real terms? When I put an ohm meter across the three terminals of the digistat, nothing happens as the programme calls for heat. Does this work by connecting terminal 1 to 3 or does it send a voltage signal? Can some please explain how the system works? thanks sam I think the best option would be to put your new Drayton Digistat 3 on Ebay or get a refund and get one of these http://www.alpha-boilers.co.uk/index.asp?wpid=109 which is specifically designed for Alpha boilers. I've got one and it's absolutely brilliant. J. |
#5
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central heating controls wiring
In article ,
John wrote: "sarmavsn" wrote in message s.com... Dear All, I had a Honeywell room thermostat which controlled the Alpha Combi boiler in the loft. I tried to replace it with a Drayton Digistat 3. It did not work. Can any one please expalin what is the meaning of the terms, call for heat, satisfied etc? What do thes wires do in real terms? When I put an ohm meter across the three terminals of the digistat, nothing happens as the programme calls for heat. Does this work by connecting terminal 1 to 3 or does it send a voltage signal? Can some please explain how the system works? thanks sam I think the best option would be to put your new Drayton Digistat 3 on Ebay or get a refund and get one of these http://www.alpha-boilers.co.uk/index.asp?wpid=109 which is specifically designed for Alpha boilers. I've got one and it's absolutely brilliant. The one it's replacing doesn't seem to have been a 'special'. What's so different about Alpha boilers? -- *Puritanism: The haunting fear that someone, somewhere may be happy. Dave Plowman London SW To e-mail, change noise into sound. |
#6
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central heating controls wiring
"Dave Plowman (News)" wrote in message ... In article , John wrote: "sarmavsn" wrote in message s.com... Dear All, I had a Honeywell room thermostat which controlled the Alpha Combi boiler in the loft. I tried to replace it with a Drayton Digistat 3. It did not work. Can any one please expalin what is the meaning of the terms, call for heat, satisfied etc? What do thes wires do in real terms? When I put an ohm meter across the three terminals of the digistat, nothing happens as the programme calls for heat. Does this work by connecting terminal 1 to 3 or does it send a voltage signal? Can some please explain how the system works? thanks sam I think the best option would be to put your new Drayton Digistat 3 on Ebay or get a refund and get one of these http://www.alpha-boilers.co.uk/index.asp?wpid=109 which is specifically designed for Alpha boilers. I've got one and it's absolutely brilliant. The one it's replacing doesn't seem to have been a 'special'. What's so different about Alpha boilers? -- *Puritanism: The haunting fear that someone, somewhere may be happy. Dave Plowman London SW To e-mail, change noise into sound. The thermostat is a changeover switch. The live feed is switched to "Call for heat" when the room is below temp and to "Satisfied" when it hits the temp. Therefore the call for heat needs to be connected to the pump / boiler .. |
#7
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central heating controls wiring
"Dave Plowman (News)" wrote in message ... In article , John wrote: "sarmavsn" wrote in message s.com... Dear All, I had a Honeywell room thermostat which controlled the Alpha Combi boiler in the loft. I tried to replace it with a Drayton Digistat 3. It did not work. Can any one please expalin what is the meaning of the terms, call for heat, satisfied etc? What do thes wires do in real terms? When I put an ohm meter across the three terminals of the digistat, nothing happens as the programme calls for heat. Does this work by connecting terminal 1 to 3 or does it send a voltage signal? Can some please explain how the system works? thanks sam I think the best option would be to put your new Drayton Digistat 3 on Ebay or get a refund and get one of these http://www.alpha-boilers.co.uk/index.asp?wpid=109 which is specifically designed for Alpha boilers. I've got one and it's absolutely brilliant. The one it's replacing doesn't seem to have been a 'special'. What's so different about Alpha boilers? -- *Puritanism: The haunting fear that someone, somewhere may be happy. Dave Plowman London SW To e-mail, change noise into sound. Don't know if you actually clicked on the link Dave but it links to a page on the Alpha website detailing the 7-day Wireless Digital Easy-Stat. The clever part is that, being designed specifically for Alpha boilers the receiver part of it just mounts in the boiler itself in an existing hole, replacing the existing timer options one-for-one, utilising the same spade connections. The transmitter can be mounted anywhere (but the OP will, presumably, want it in the same place as his existing programmer). The whole thing can be fitted, programmed and working within 5 minutes - and it can be retro-fitted into existing Alpha boilers. John. PS, never sure about netiquette - should I be snipping out your (anyone's) sig when I reply? It's not so bad on a single reply but it can take up loads of room when it gets to 5 or 6 postings in a thread ) |
#8
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central heating controls wiring
In article ,
John wrote: I think the best option would be to put your new Drayton Digistat 3 on Ebay or get a refund and get one of these http://www.alpha-boilers.co.uk/index.asp?wpid=109 which is specifically designed for Alpha boilers. I've got one and it's absolutely brilliant. The one it's replacing doesn't seem to have been a 'special'. What's so different about Alpha boilers? The thermostat is a changeover switch. The live feed is switched to "Call for heat" when the room is below temp and to "Satisfied" when it hits the temp. Therefore the call for heat needs to be connected to the pump / boiler . The Drayton Digistat 3 is also a changeover type. So if the system worked fine with the original Honeywell it will too with the Digistat. -- *You can't have everything, where would you put it?* Dave Plowman London SW To e-mail, change noise into sound. |
#9
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central heating controls wiring
In article ,
John wrote: The one it's replacing doesn't seem to have been a 'special'. What's so different about Alpha boilers? Don't know if you actually clicked on the link Dave but it links to a page on the Alpha website detailing the 7-day Wireless Digital Easy-Stat. I did, but it's one of those websites that don't load properly on this browser so I lost interest. The clever part is that, being designed specifically for Alpha boilers the receiver part of it just mounts in the boiler itself in an existing hole, replacing the existing timer options one-for-one, utilising the same spade connections. The transmitter can be mounted anywhere (but the OP will, presumably, want it in the same place as his existing programmer). The whole thing can be fitted, programmed and working within 5 minutes - and it can be retro-fitted into existing Alpha boilers. Handy for a new fit, I'd say, but the OP just wants to replace an existing stat with a different one, so the wiring must already be in place. PS, never sure about netiquette - should I be snipping out your (anyone's) sig when I reply? It's not so bad on a single reply but it can take up loads of room when it gets to 5 or 6 postings in a thread ) Yes, you should remove it. Better newsreaders will do it automatically as that's the purpose of the sig separator. (-- ) -- *Gaffer tape - The Force, light and dark sides - holds the universe together* Dave Plowman London SW To e-mail, change noise into sound. |
#10
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central heating controls wiring
In an earlier contribution to this discussion,
John wrote: PS, never sure about netiquette - should I be snipping out your (anyone's) sig when I reply? It's not so bad on a single reply but it can take up loads of room when it gets to 5 or 6 postings in a thread ) A decent newsreader will do it for you - or even an indecent one with the right plugins! I use a thing called "OE-Quotefix" in conjunction with Outlook Express. It automatically removes signatures, and leaves the cursor at the *bottom* - just ready for typing your reply without any danger of top posting. Quotefix is a free program (Google for downloading details) which attaches itself to OE, and needs very little setting up - although it does have setup options which you can use if you like. -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
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