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Three connections on top of new hot water cylinder

  • 24-12-2014 8:27am
    #1
    pogman
    Registered Users Posts: 3 ✭


    I got a new joule hot water cylinder the other day and I'm scratching my head why it's got three connections on top. The one in the centre is hot water out. The one on the left is blocked but is obviously the immersion because it's so wide. But what's the third one. Looks like a 3/4 inch. I'm thinking it could be a separate feed for the shower but I'm not sure.


Comments

  • #2
    Dtp1979
    Registered Users, Registered Users 2 Posts: 12,840 ✭✭✭✭Dtp1979


    pogman wrote: »
    I got a new joule hot water cylinder the other day and I'm scratching my head why it's got three connections on top. The one in the centre is hot water out. The one on the left is blocked but is obviously the immersion because it's so wide. But what's the third one. Looks like a 3/4 inch. I'm thinking it could be a separate feed for the shower but I'm not sure.

    Ye it's for a shower or shower pump. Just blank it. Do no use a gunbarrell plug. Use a brass plug


  • #3
    pogman
    Registered Users Posts: 3 ✭pogman


    Dtp1979 wrote: »
    Ye it's for a shower or shower pump. Just blank it. Do no use a gunbarrell plug. Use a brass plug

    Thanks I managed to get one in Churchtown Stores. Strangely it's not a Irish 3/4 but a UK size. Thanks again I should have hot water for Christmas :-)


  • #4
    Dtp1979
    Registered Users, Registered Users 2 Posts: 12,840 ✭✭✭✭Dtp1979


    pogman wrote: »
    Thanks I managed to get one in Churchtown Stores. Strangely it's not a Irish 3/4 but a UK size. Thanks again I should have hot water for Christmas :-)

    It's 3/4 bsp thread. It's the same thread over here


  • #5
    TheChizler
    Registered Users, Registered Users 2 Posts: 9,474 ✭✭✭TheChizler


    Said I'd jump in this thread rather than start another!

    My parents got a solar heating system installed a few years back, the system has never been perfect, there have always been problems with the panels overheating, subsequent plumbers have repeatedly said the panels are too big for the amount of water used. It's a 300 L tank.

    I've moved back in temporarily and to earn my keep I was investigating (eventually) something my mother has always been mentioning and I've noticed occasionally but never really been bothered to look into. The solar controller says the top of the tank is hot but lukewarm water is coming out of the taps. I noticed the hot water feed was taken from the secondary return connector on the tank, instead of the top feed outlet which would normally be correct, wouldn't it? The top feed in fact leads up into the attic, where I presume it overflows back into the tank. This would explain why we're getting cool water when the top of the tank is hot.

    cylinder1.jpg

    cylinder2.jpg

    I'm now suspicious that the solar installers thought we had a re-circulating hot water setup, the booster pump was present before the bigger tank was installed, and since the change the booster pump wont shut off automatically unless you close the hot tap quickly, and if the pump is left to run without a tap open for a while hot water comes out of the cold tap, which I know probably isn't right... :rolleyes: I'll leave looking for the loop for another day, but for now I'm wondering is this sort of cylinder connection normal or even ok? It could partly explain the panels overheating, as a good portion of the buffer tank might was well not exist. The solar installation to say the least was less than satisfactory, the company made a load of stupid mistakes, including originally making hot water pour into the drain for a few years and covering the house interior in glycol.

    Here's the guide for the cylinder we're using: CY300L.


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