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Pumped hot water problem

  • 30-11-2013 6:20pm
    #1
    Chippy01
    Registered Users, Registered Users 2 Posts: 627 ✭✭✭


    Friend of mine has a problem.
    Many years ago he had a attic conversion to get an extra bedroom. Last year he gave his attic an upgrade, to include an en-suite shower, toilet and wash-hand basin.
    The old storge tank in the attic was changed to a pair of coffin tanks and put under the low part of the roof that won't get used. The hot water cylinder is in it's original position on the first floor.
    Because the en-suite's outlets are above the cold water storage tanks, the guy who did the plumbing fitted a negative head water pump on the far side of the attic to the coffin tanks, sitting on the first floor ceiling.
    Once the system is primed and used every day works a treat.
    The problem arises if the hot water is not used after 2 - 3 days. After this time if the cold water is turned on it will work as it should; however the hot will not. The pump will run but no hot water gets pumped, and unless the pump is switched off at the power source, it will keep on running.
    Air must be getting into the sysytem somehow and creating an air-lock, but we are at a loss as to how it's getting in or why. There are no water leaks between the pump and the en-suite outlets (approx 4 metres).

    Any ideas how to keep the hot working like the cold, - as it should?


Comments

  • #2
    rightjob!
    Registered Users, Registered Users 2 Posts: 478 ✭✭rightjob!


    sounds like he took the hot feed of the expansion pipe instead of using an essex flange


  • #3
    Tullogher
    Registered Users, Registered Users 2 Posts: 71 ✭✭Tullogher


    Is he missing some non return value s


  • #4
    Chippy01
    Registered Users, Registered Users 2 Posts: 627 ✭✭✭Chippy01


    rightjob! wrote: »
    sounds like he took the hot feed of the expansion pipe instead of using an essex flange

    Quite possible - TBH I don't know. The problem now is trying to fix the problem.
    Ideally, a new feed back to the hot water cylinder would probably sort it, but he's had the place newly decorated and his OH goes ape**** at the mention of even thinking of pulling the place apart to put in more pipes.

    So, how can we stop it airlocking without tearing his house apart?


  • #5
    rightjob!
    Registered Users, Registered Users 2 Posts: 478 ✭✭rightjob!


    Chippy01 wrote: »
    Quite possible - TBH I don't know. The problem now is trying to fix the problem.
    Ideally, a new feed back to the hot water cylinder would probably sort it, but he's had the place newly decorated and his OH goes ape**** at the mention of even thinking of pulling the place apart to put in more pipes.

    So, how can we stop it airlocking without tearing his house apart?

    put the pump in the hotpress,surrey flange and thats it sorted.
    no problems then
    sounds like thats the problem,and if its not sorted he could end up buying a new pump if it runs dry


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