Which way round should the filling loop be fitted?

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Discuss Which way round should the filling loop be fitted? in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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casaco

One manufacturer's instructions tell you to fit the check valve on the cold feed and other manufacturers tell you to fit the check valve on the return. We have always fitted the check valve to the heating pipe. Who is right and who is wrong?
 
I personally would always just follow the MI's that way you know youre good.
 
The problem if you fit the check valve to the cold feed, you have to drain down to change the iso valve on the boiler side, and are those little valves rated for CH temperatures?
 
It varies from manufacturer to manufacture just do what is on the tin and follow the book
 
Ok, all you peeps out there who have not done your Water Regs, the double check valve is required as most plumbers know to protect (along with the removable connection) against back flow of the dirty category 3 domestic heating water into the nice clean mains water which is category 1, therefore the protection device has to be fitted to the mains cold water otherwise dirt can enter.
This means that those cheap filling loops which only have one isolation valve can only be used if another valve is supply & installed, so you might as well buy the proper ones, doing this also has the benefit of providing a 15mm drain down, flushing & injection point, normally below the boiler & if the check valve fails it can easily be replaced without the need to drain the heating.
Please remove the filling loops after you have finished filling it is a requirement (sorry a pet hate), hope this clears up any confusion.
 
According to CORGI BOOK (Central Heating ) page 112 / 113 the check valve go's on the water main, think it's somewere in water reg to, but can't find it, dare say someone will ! but our local water board want it fitted this way, reason I think they have problems with plastic parts in chack valve failing due to heat transfer from heating pipe.
 
corgi , gas safe etc etc etc etc are all wrong each manufacturer can be different do what it says in the book
 
So your reading the same book as casaco ? If he has a book that says fit on return you fit on return if he has a book saying fit on feed you fit on feed .
 
I'm guilty of fitting them on the heating in the past mainly because the cheaper ones came without an iso and ignorance to be honest! I assumed the check valve had to go onto the heating side because of the directional arrow of flow printed on them. They must go as Chris has said ... On the cold water main :)
 
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diamondgas said:
I'm guilty of fitting them on the heating in the past mainly because the cheaper ones came without an iso and ignorance to be honest! I assumed the check valve had to go onto the heating side because of the directional arrow of flow printed on them. They must go as Chris has said ... On the cold water main :)
Click to expand...


So if you had MI's saying fit on return you'd still fit on main ?
 
Last edited by a moderator:
chris watkins said:
Ok, all you peeps out there who have not done your Water Regs, the double check valve is required as most plumbers know to protect (along with the removable connection) against back flow of the dirty category 3 domestic heating water into the nice clean mains water which is category 1, therefore the protection device has to be fitted to the mains cold water otherwise dirt can enter.
This means that those cheap filling loops which only have one isolation valve can only be used if another valve is supply & installed, so you might as well buy the proper ones, doing this also has the benefit of providing a 15mm drain down, flushing & injection point, normally below the boiler & if the check valve fails it can easily be replaced without the need to drain the heating.
Please remove the filling loops after you have finished filling it is a requirement (sorry a pet hate), hope this clears up any confusion.
Click to expand...
Spot on Chris. Well explained.
 
I've just checked a Part L compliant loop I've just bought for a job I'm doing tomorrow! Guess what? The loop is connected iso first with arrow pointing to the loop, then check valve arrow pointing out to compression nut! I'd be fitting the check valve to the heating following the way that was put together .... ! No mi's! Go figure :) Bought from here FL 110 Filling Loop Part L Compliance
 
Hi diamondgas, well, yes, thats the problem, the arrows show the flow through the valves, but you still get the same direction of flow through the valves from cold feed to return or return to cold feed, it just depends on which way round you fit the loop. That was why I was asking, which way round does it go. Baxi say one way, Vokera the opposite way.
 
Not what they say it;s water regs check valve on cold main, find out what happens if you fit it on heating pipe and it fails, contaminates water main who do you think will get took to court ????
 
casaco said:
Hi diamondgas, well, yes, thats the problem, the arrows show the flow through the valves, but you still get the same direction of flow through the valves from cold feed to return or return to cold feed, it just depends on which way round you fit the loop. That was why I was asking, which way round does it go. Baxi say one way, Vokera the opposite way.
Click to expand...

And the one in question was pre-set up to connect the iso to the mains and the check valve to the heating circuit!!!
 
The check valve is to protect the mains from impurities. It is not to prevent contaminated water exiting the heating system.
 
Check valve is always fitted to the cold main side. If MI state different then you need to also comply with the water regs so need to fit an additional double check on the cold main. So it will cost your more if you follow MI in this instance.

Some chemicals can be dosed via the filling loop so having the check on the heating side wont protect the cold from contamination.

Happy birthday Bod :)
 
mountainman said:
BORING, I thought this question was done to death a few months ago :-/
Click to expand...

The op has a legitimate question that has sparked the prior responses! I'm assuming they weren't privy to whatever thread you're referring to mountainman! I doubt the response has been that boring for the op, more informative I'd imagine :)

Isn't that what this place is for, people to ask questions?
 
What a mess, I have the same filling loop as diamond gas , the valve in this one as well, following the directional arrows will be fitted on the heating side, not big problem the valve can be easily reversed and fitted on the water main , my concern is the little Iso valve, it may had to fitted with the arrow pointing out of the CH side, any opinion?
 
AWheating said:
Check valve is always fitted to the cold main side. If MI state different then you need to also comply with the water regs so need to fit an additional double check on the cold main. So it will cost your more if you follow MI in this instance.

Some chemicals can be dosed via the filling loop so having the check on the heating side wont protect the cold from contamination.

Happy birthday Bod :)
Click to expand...


Cheers aw
 
mountainman said:
BORING, I thought this question was done to death a few months ago :-/
Click to expand...
Sorry to bore you mountain man, but I did try and look back over old posts before I placed mine. Unfortunately I couldn't find the answer I was looking for. Guess what, despite all the replies I have had so far, I still can't decide which way the loop should be fitted.
If the check valve fails in any position there will be a risk of contamination, don't forget some loops only have 1 iso valve attached to the check valve, so much for water regs then.
 
casaco said:
Sorry to bore you mountain man, but I did try and look back over old posts before I placed mine. Unfortunately I couldn't find the answer I was looking for. Guess what, despite all the replies I have had so far, I still can't decide which way the loop should be fitted.
If the check valve fails in any position there will be a risk of contamination, don't forget some loops only have 1 iso valve attached to the check valve, so much for water regs then.
Click to expand...

Exactly why the subject is boring, too many conflicting replies to be of any help.
Traditionally there is one iso and one check valve with a flexible loop.
The loop should only be connected whilst filling the system then removed.
No chance of cross contamination then.
 
casaco said:
Sorry to bore you mountain man, but I did try and look back over old posts before I placed mine. Unfortunately I couldn't find the answer I was looking for. Guess what, despite all the replies I have had so far, I still can't decide which way the loop should be fitted.
If the check valve fails in any position there will be a risk of contamination, don't forget some loops only have 1 iso valve attached to the check valve, so much for water regs then.
Click to expand...

My take in this is that the check valve is to protect the mains water and therefore any water leaving the mains to enter the heating must first travel through the 'protection barier' formed by the check valve! That way there's no way contamination can get back through except if the valve fails!

That's probably been said already, but there ya go :)
 
mountainman said:
BORING, I thought this question was done to death a few months ago :-/
Click to expand...

It is wrong to assume that all members have the time or patience to trawl prior posts in search of an answer. Occasionally topics can be difficult to locate depending on search tags, and don’t forget when you are under pressure you may need a quick answer. Even you are guilty of your perceived monotony. I note you requested help recently on an area which was addressed in 2010 (here are the links). A little searching around the forum may have helped? We are not all experts in all areas which is the reason we come on here; to learn and impart knowledge on others.
http://www.ukplumbersforums.co.uk/central-heating-forum/36710-ideal-isar-noisy.html

http://www.ukplumbersforums.co.uk/central-heating-forum/13456-ideal-isar-he-24-banging.html
 
Backboiler said:
It is wrong to assume that all members have the time or patience to trawl prior posts in search of an answer. Occasionally topics can be difficult to locate depending on search tags, and don’t forget when you are under pressure you may need a quick answer. Even you are guilty of your perceived monotony. I note you requested help recently on an area which was addressed in 2010 (here are the links). A little searching around the forum may have helped? We are not all experts in all areas which is the reason we come on here; to learn and impart knowledge on others.
http://www.ukplumbersforums.co.uk/central-heating-forum/36710-ideal-isar-noisy.html

http://www.ukplumbersforums.co.uk/central-heating-forum/13456-ideal-isar-he-24-banging.html
Click to expand...

Point taken but an appliance specific question is not the same as one on a generic subject that had been 'done to death' a few weeks ago.
Besides, if the filling loop is bought in a plumbing shop then the staff there or another customer should be able to answer the question of orientation in a few moments.
 
diamondgas said:
I'm guilty of fitting them on the heating in the past mainly because the cheaper ones came without an iso and ignorance to be honest! I assumed the check valve had to go onto the heating side because of the directional arrow of flow printed on them. They must go as Chris has said ... On the cold water main :)
Click to expand...
aggree the cheap ones can only be fitted that way been using the pts ones they have 2 valves
 
chris watkins said:
Ok, all you peeps out there who have not done your Water Regs, the double check valve is required as most plumbers know to protect (along with the removable connection) against back flow of the dirty category 3 domestic heating water into the nice clean mains water which is category 1, therefore the protection device has to be fitted to the mains cold water otherwise dirt can enter.
This means that those cheap filling loops which only have one isolation valve can only be used if another valve is supply & installed, so you might as well buy the proper ones, doing this also has the benefit of providing a 15mm drain down, flushing & injection point, normally below the boiler & if the check valve fails it can easily be replaced without the need to drain the heating.
Please remove the filling loops after you have finished filling it is a requirement (sorry a pet hate), hope this clears up any confusion.
Click to expand...


i agree -noticed the cheap ones they cant be reversed as the thread is different on one side and loop wont tighten if spun around.
 
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