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PlumbBobBob
you don't need to turn down the tank stat it must be at 60 degrees to kill bugs. it only needs moving down towards the bottom third of the tank
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- Thread starter coursemyhorse
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fuzzy
looks like the feed and vent are the wrong way round. swap them over, lower pumo below the bypass(wrong side of pump) and fir auto by pass valve. should fix problem
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coursemyhorse
None of this is meaning much to me as I'm not a plumber myself. Is all of the advice given to fix the knocking problem only right? So what would be rough costs to get someone out to move the stat down lower (or can I do this myself?) and to sort out the bypass/valve/vent changes required? Would the work be guaranteed to stop the noise or would I pay anyway and then see if it works kind of thing? Just a rough cost estimate from someone...are we talking £50 £100 £500 ?
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tamz
A Y plan (your system, with a mid position valve) does not under most circumstances, need a bypass.
As they have fitted one to the wrong side of the pump it is causing the water to short circuit with most of the water following the red line where it should follow the pink line back to the boiler. When on for CH only the bypass is cut out of the circuit and if on for HW and CH it won't effect it as much.
Close the bypass by turning the screw on the silver valve so that it is across the pipe.
You can leave the tank stat where it is. Turn it to 65 deg.
Your room stat sited upstairs is in the worst position (heat rises), and should really be downstairs. It doesn't matter what temp it reads or what your neighbours and friends set theirs at. Set it at what you feel comfortable at (and it won't be 18 unless you like wearing a jacket to watch the telly).
As they have fitted one to the wrong side of the pump it is causing the water to short circuit with most of the water following the red line where it should follow the pink line back to the boiler. When on for CH only the bypass is cut out of the circuit and if on for HW and CH it won't effect it as much.
Close the bypass by turning the screw on the silver valve so that it is across the pipe.
You can leave the tank stat where it is. Turn it to 65 deg.
Your room stat sited upstairs is in the worst position (heat rises), and should really be downstairs. It doesn't matter what temp it reads or what your neighbours and friends set theirs at. Set it at what you feel comfortable at (and it won't be 18 unless you like wearing a jacket to watch the telly).
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fuzzy
tamz has pretty much described the problems there for you. you can shut off the bypass which should sort the issue or better still resite it. yes in most cases it doesnt need a bypass as there is always a route for the water unlike an s but it is recommended
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coursemyhorse
Thankyou! I 100% understand what you guys mean now having seen the above diagram. OK, so the chrome valve on the bypass...which way should I turn it to close it? I assume clockwise? It was at horizontal i.e. 9 and 3 O clock, and I turned it a quarter of a turn clockwise to 6 and 12 O clock and it started dripping as I turned it. It got stiff after a quarter turn clockwise so I stopped, but I think I could turn it more. Should I force it till it won't go any further or is a quarter turn enough? I don't think it is closed but not sure. Thanks all for the help so far. Also, I noticed with HW and CH on, I still think it knocks a bit. It is quietest when just CH on which would fit with info above as bypass not used then. It is def air in the pipes. Can tell by the way the pump sounds and behaves.
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fuzzy
if the line on the top is in line with the water flowing its on. if its adjacent it is off, just use a slottede screwdriver to turn it the correct way
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coursemyhorse
EDIT:
In that case then, it was already off as it was going accross the pipe before I adjusted it 🙁
In that case then, it was already off as it was going accross the pipe before I adjusted it 🙁
Last edited by a moderator:
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coursemyhorse
I just turned it 180 degrees the other way to the off position to see if it made a difference. Not sure why it leaks when I turn it. Anyway, I turned the HW on on its own and so far it has not knocked. However, I think the knocking usually occurs only when the HW first starts up having been off for a while. First thing in the morning does seem worst (6:30am), however, it does do it in the afternoon when it comes on again around 3pm sometimes. I will test it tomorrow morning and see if anything has changed. Thanks for all your help.
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fuzzy
is your cold water inlet the first pipe on the flow before the pump? the second one being 22mm and going over the cistern?
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tamz
Probably is Fuzzy, in which case the neutral point being the feed will mean it will draw air.
Easiest fix is change it to a feed expansion.
Whoever fitted this lot has never even slept with a plumber but is about the usual quality for landlord accommodation. Surprised at the Worcs boiler tho. That is a first. Usually a Ravenheap 😀
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fuzzy
you mean link them ?? yeh seen that doen before and does fix the problem but not ideal. bit more difficult to change to a VIP
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Gray0689
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coursemyhorse
Hey guys, I think I need another few morning to monitor this to be sure this is not a fluke, but this morning it didn't knock. It was quiet as anything. Well...just the pump noise with no air knocks. Maybe when I turned the bypass valve the other way this time it shut it off properly and it wasn't fully closed last time? Maybe to do with it leaking when I turn it not sealing properly? I will let you know what tomorrow is like 🙂
If this does turn out to fix it, I don't know how to thank you all. Seriously thanks so much.
The thermostat thing I can live with since the heating does work I guess.
Someone earlier said that the plumber didn't like clips (or did can't remember), what does that refer to in the pics? I know the work looks shoddy you say, would this have been done when the house was first built or recently? Is the Worcs boiler a goodun then? Thanks again all. Really appreciate it.
If this does turn out to fix it, I don't know how to thank you all. Seriously thanks so much.
The thermostat thing I can live with since the heating does work I guess.
Someone earlier said that the plumber didn't like clips (or did can't remember), what does that refer to in the pics? I know the work looks shoddy you say, would this have been done when the house was first built or recently? Is the Worcs boiler a goodun then? Thanks again all. Really appreciate it.
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swade91
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fuzzy
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coursemyhorse
No, this is why it was moved in the first place since it was in a corner in the lounge near to a radiator. It got moved upstairs on the landing not near any heat or cold source.
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fuzzy
landing isnt a great place as heat rises. best place is the hall, shouldnt give you the probs you are usggesting though, when does it 'click'?
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coursemyhorse
If I turn it on first thing in the morning in this current weather (starting to get colder) I gradually turn it and it will click on at around 25/26 c
I think the knocking may have gone away! Touch wood.
I think the knocking may have gone away! Touch wood.
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fuzzy
if it is clicking at 25/26c then it suggest your house is around that temp, thats hot!!!!!!!!!!!!!!! is it hot? if not then the stat itself could be the problem
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