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Wiring diagram for old central heating system
Hi,
The "diverter valve" has gone bang on my mum's central heating system and we are told that it is obsolete. The system looks very much like a modern Y plan system - fully pumped, 3 port valve, separate timed control of heating and hot water, etc. The only difference from a modern Y plan system is that the wiring box contains a relay. The plumber is being useless, so I may have to do the work myself, it should be a straightforward task to replace the "diverter valve" with a modern 3 position valve and replace the wiring centre with a modern one without the relay. The tedious bit will be identifying all the unlabelled wires coming into the wiring centre - a task which would be made a lot simpler if I had a wiring diagram. Does anyone recognise the description of the system and have a wiring diagram they could scan for me (or point me to one on the Internet). The system is of mid 70's vintage (1976 or 1977 I think) and the diverter valve and wiring centre are made by Satchwell. Unfortunately I am unable to see any part number on the diverter valve. TIA, Martin. |
Wiring diagram for old central heating system
In an earlier contribution to this discussion,
Martin Wiseman wrote: Hi, The "diverter valve" has gone bang on my mum's central heating system and we are told that it is obsolete. The system looks very much like a modern Y plan system - fully pumped, 3 port valve, separate timed control of heating and hot water, etc. The only difference from a modern Y plan system is that the wiring box contains a relay. The plumber is being useless, so I may have to do the work myself, it should be a straightforward task to replace the "diverter valve" with a modern 3 position valve and replace the wiring centre with a modern one without the relay. The tedious bit will be identifying all the unlabelled wires coming into the wiring centre - a task which would be made a lot simpler if I had a wiring diagram. Does anyone recognise the description of the system and have a wiring diagram they could scan for me (or point me to one on the Internet). The system is of mid 70's vintage (1976 or 1977 I think) and the diverter valve and wiring centre are made by Satchwell. Unfortunately I am unable to see any part number on the diverter valve. TIA, Martin. Can't help with original wiring diagram, I'm afraid. But surely, there can't be *that* many wires? There should be wires going to: * Boiler * Pump * Programmer * Room stat * Cylinder stat * Diverter valve Unless you're very unlucky, some of the cables will be different colours and/or sizes or number of conductors from the others - so if you see what they look like at the remote end, you can probably identify most of them at the wiring centre end. Failing that, you'll have to disconnect them at both ends, short live to neutral at the remote end of each one in turn, then use a continuity checker at the wiring centre end. What you're aiming at when you re-connect everything is a standard Y-Plan setup as per http://content.honeywell.com/uk/homes/systems.htm (scroll down to Y-Plan). The only slight change to this would be if the boiler needs pump over-run - which is unlikely if it's 30 years old! Things to watch are that the programmer must have a HW OFF connection and the cylinder stat must be the changeover type, with 2 connections. It's just possible that the existing ones don't - and that the relay does what they would otherwise have to do. -- Cheers, Set Square ______ Please reply to newsgroup. Reply address is invalid. |
Wiring diagram for old central heating system
On Wed, 12 Oct 2005 21:55:44 +0100, Martin Wiseman wrote:
Hi, The "diverter valve" has gone bang on my mum's central heating system and we are told that it is obsolete. The system looks very much like a modern Y plan system - fully pumped, 3 port valve, separate timed control of heating and hot water, etc. The only difference from a modern Y plan system is that the wiring box contains a relay. The plumber is being useless, so I may have to do the work myself, it should be a straightforward task to replace the "diverter valve" with a modern 3 position valve and replace the wiring centre with a modern one without the relay. The tedious bit will be identifying all the unlabelled wires coming into the wiring centre - a task which would be made a lot simpler if I had a wiring diagram. Does anyone recognise the description of the system and have a wiring diagram they could scan for me (or point me to one on the Internet). The system is of mid 70's vintage (1976 or 1977 I think) and the diverter valve and wiring centre are made by Satchwell. Unfortunately I am unable to see any part number on the diverter valve. Quite a few of the wires will lead to nearby items. E.g. cylinder stat, pump. The incoming mains should be easy to identify. The boiler and pump may well be in parallel so easy to find. The relay might simply be there because the programmer/timer does not provide and HW off signal. The remaining wire(s) will be to a room and/or frost thermostats. -- Ed Sirett - Property maintainer and registered gas fitter. The FAQ for uk.diy is at http://www.diyfaq.org.uk Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html |
Wiring diagram for old central heating system
Hi,
As a follow up to my previous post I have put a couple of pictures of the diverter valve on a webpage in case it helps jog anyone's memory. http://www.wiseman999.plus.com/diverter.htm Can't help with original wiring diagram, I'm afraid. But surely, there can't be *that* many wires? That is true and I have some idea of how it is all connected up because I spent a very happy half term week at the age of 10 watching it all being installed, however I do recall that the "professional" who installed it wired everything up with multiple lengths of identical 3 core cable. Hence all the cables from the boiler, programmer and room stat look identical at the point they enter the airing cupboard. Working it out will be straightforward, however it would be much quicker and much less tedious with a wiring diagram. The only slight change to this would be if the boiler needs pump over-run - which is unlikely if it's 30 years old! I'm pretty sure it does. There are certainly more than 3 wires going to the boiler. Things to watch are that the programmer must have a HW OFF connection and the cylinder stat must be the changeover type, with 2 connections. A good point, which hadn't occurred to me. Those are also things that a wiring diagram would help with (I should point out that I don't live particularly close to my mum so I can't just pop over there to have a look). What I am hoping is that I can just turn up on Sunday with a 3 port valve and wiring centre and wire it up so that at the bare minimum she has heat that she can manually switch on and off. Martin. |
Wiring diagram for old central heating system
In message , Martin Wiseman
writes Hi, As a follow up to my previous post I have put a couple of pictures of the diverter valve on a webpage in case it helps jog anyone's memory. http://www.wiseman999.plus.com/diverter.htm It's a satchwell 3XXX series diverter valve (prolly a 3701) (If you can get the head off the valve, it should be stamped on the plate) However, there are two different types of actuator head, one which works under a spring return and the other which has a motor which drives continually in the same direction Does the little "window" in the middle of the top say "Satchwell" (3701) or is it clear with a red or blue vane underneath denoting the position of the valve (36XX - I forget) ? You should be able to find some useful info in the faqs, if not email me at geoff_at_cetltd.co.uk Can't help with original wiring diagram, I'm afraid. But surely, there can't be *that* many wires? That is true and I have some idea of how it is all connected up because I spent a very happy half term week at the age of 10 watching it all being installed, however I do recall that the "professional" who installed it wired everything up with multiple lengths of identical 3 core cable. Hence all the cables from the boiler, programmer and room stat look identical at the point they enter the airing cupboard. Working it out will be straightforward, however it would be much quicker and much less tedious with a wiring diagram. The only slight change to this would be if the boiler needs pump over-run - which is unlikely if it's 30 years old! I'm pretty sure it does. There are certainly more than 3 wires going to the boiler. Things to watch are that the programmer must have a HW OFF connection and the cylinder stat must be the changeover type, with 2 connections. A good point, which hadn't occurred to me. Those are also things that a wiring diagram would help with (I should point out that I don't live particularly close to my mum so I can't just pop over there to have a look). What I am hoping is that I can just turn up on Sunday with a 3 port valve and wiring centre and wire it up so that at the bare minimum she has heat that she can manually switch on and off. Martin. -- geoff |
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