Which way round should the filling loop be fitted?

[mountainman]

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.

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.

 

[diamondgas]

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.

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

 

[Backboiler]

BORING, I thought this question was done to death a few months ago :-/

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

 

[mountainman]

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

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.

 

[buckley plumb]

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

aggree the cheap ones can only be fitted that way been using the pts ones they have 2 valves

 

[buckley plumb]

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.

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.