Astra
Full Member
Posts: 219 
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Post by Astra on Apr 1, 2023 17:48:32 GMT
Hi Guy's going to fit new cylinder over Easter Weekend and want to buy a new cylinder thermostat as the one on there although it works, is rather old but is very big compared to a Drayton or Honeywell but I am not an electrician so worried I will buy the wrong one and wire it up incorrectly please see attached Photo of what I currently have HELP Please.  |
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Post by tomplum on Apr 1, 2023 20:39:07 GMT
A cylinder stat has 3 wires, They are all the same but the colours may vary, buy any you like using my criteria for purchasing anything, Get the best quality for the least amount of money, With the power off open the cyl stat and note the position of the colours where they go, there is a comm ( common), NO ( normally open) and NC ( normally closed) , swap the cylinder stat wires like for like,  |
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Post by dickpuller on Apr 1, 2023 20:39:13 GMT
It depends what control system is fitted. If it’s an S Plan, then only two connections are required. A Y Plan three connections are required.
Most Cylinder Thermostats will have 3 connections;
C = Common
NO = Normally Open
NC = Normally Closed
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Post by tomplum on Apr 1, 2023 20:41:18 GMT
sorry dick I just piped you to the post... but we both had the same answer |
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Post by dickpuller on Apr 2, 2023 4:57:23 GMT
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Post by battle1066 on Apr 2, 2023 10:57:47 GMT
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Astra
Full Member
Posts: 219
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Post by Astra on Apr 2, 2023 14:27:07 GMT
Ok many thanks Guy's I understand what you have all said ,,,,,Now I fancy using the Honeywell one but still worried about the actual wiring up ,,,, what would happen if I get the wires round the wrong way ?? would it destroy the new cylinder stat or just not work and how would I know I got it wrong thank you........... Just been on Amazon and ordered 1-off these at a good price www.screwfix.com/p/honeywell-home-l641a-cylinder-stat/40051 |
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Post by dickpuller on Apr 2, 2023 15:11:41 GMT
Ok many thanks Guy's I understand what you have all said ,,,,,Now I fancy using the Honeywell one but still worried about the actual wiring up ,,,, what would happen if I get the wires round the wrong way ?? would it destroy the new cylinder stat or just not work and how would I know I got it wrong thank you........... Just been on Amazon and ordered 1-off these at a good price www.screwfix.com/p/honeywell-home-l641a-cylinder-stat/40051[br As already stated; you need to confirm the control system ‘Y’ or ‘S’? For either systems, it’s only switched lives, so if you connect the wires the wrong way, the system will not work correctly. |
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Astra
Full Member
Posts: 219
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Post by Astra on Apr 7, 2023 12:29:39 GMT
Hi Guy's Well new cylinder in and plumbed " Y " Plan system now I need to wire in new cylinder Stat ( Honeywell ) Please photo of current wire positions ...........Now as it is just sitting there the yellow wire is live in position 2 so where do I need to put the yellow wire ( Live ) and the other 3 wires .....4 -off in total As the Honey Stat only has 3 positions C , 1 , 2 , Hope you can help many thanks  |
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Astra
Full Member
Posts: 219
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Post by Astra on Apr 7, 2023 16:52:04 GMT
Further Information
Turned on the boiler selected for Hot water Cylinder Stat Terminal Now
Yellow wire NO POWER
White wire now has POWER
Blue wire now has POWER
So does that help anyone who nose what wires i need to put in which terminal ??
I think Yellow to C Terminal
& Blue and white wire to terminal 1 please can anyone confirm that this is correct or what should it be ?
" Y " Plan system
Many thanks
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Post by dickpuller on Apr 8, 2023 7:42:24 GMT
Further Information Turned on the boiler selected for Hot water Cylinder Stat Terminal Now Yellow wire NO POWER White wire now has POWER Blue wire now has POWER So does that help anyone who nose what wires i need to put in which terminal ?? I think Yellow to C Terminal & Blue and white wire to terminal 1 please can anyone confirm that this is correct or what should it be ? " Y " Plan system Many thanks C = Common HW on(Programmer) 1 = NC Orange to MV, Sw/L to Boiler & Pump. 2 = NO Grey to MV & HW off(Programmer) So trace your conductors(wires)at the 10 Way junction box. When you select HW only on the Programmer & the Cylinder is cold = Common & 1 is live. When you select CH only, HW is off on the Programmer & the Cylinder is satisfied(very Hot) 2 only is Live. No point in just going by the colour of wires you have, check. The previous daft cunt could’ve got them wrong. |
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Post by dickpuller on Apr 8, 2023 7:49:08 GMT
Asda, ‘Y’ plan controls wiring is the most difficult On/Off 240vac to wire & fault find on. The electronics in a Mid-Poss motorised Valve are complex for the hard of thinking. But that doesn’t mean you can just shit your pants & not learn about them!! If you have an auto range Multimeter, use it.
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Astra
Full Member
Posts: 219
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Post by Astra on Apr 9, 2023 17:59:04 GMT
All sorted and now working as it did before ,,,,,,,After watching You tube Video which turned out to be a load of Rubbish for me
where it said perm live has to be fitted to Common Terminal which for me is all wrong ,,,,, then after reading Dick's last thread
where he says all depends what the last Fu*ker had done with the wiring ,,,,,,,So all I did was get a piece of paper and pen
and note down the 3 wire position and just move the wire positions until it worked and as it turned out for me Perm Live
has ended up on Terminal 2 wtf You Tube ........
Many thanks to all who replied to me
Regards
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Post by crowsfoot on Apr 16, 2023 7:07:34 GMT
You'd be surprised at how many plumbers work things out exactly the way you've done Astra.
To quote an old gaffer of mine "There's not really much to electrics as long as you keep the live and neutral wire apart"!
Mind you, he always struck me as being a bit dangerous with wiring in spite of him being a one time college lecturer.
This is around 1974 - 1978.
Look at how all this as changed into today's H&S in electrics.
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Post by dickpuller on Apr 16, 2023 12:27:06 GMT
You'd be surprised at how many plumbers work things out exactly the way you've done Astra. To quote an old gaffer of mine "There's not really much to electrics as long as you keep the live and neutral wire apart"! Mind you, he always struck me as being a bit dangerous with wiring in spite of him being a one time college lecturer. This is around 1974 - 1978. Look at how all this as changed into today's H&S in electrics. It’s not just H&S. We’ve moved on so much from the old 240vac On/Off Systems, the Y & S plans are old hat. With modern Central Heating controls based on the ‘Bus’ automotive industry protocol. It’s never been so important to understand electronics in our industry, the changes & developments are so fast it’s breathtaking!!! |
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