just moved in and need to turn off hot water

Discussion in 'Plumbing and Central Heating' started by leebarlow, 14 Jul 2013.

  1. leebarlow

    leebarlow

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    Hi all
    I just moved in and need to turn off my hot water so I can fit a new bath tap.
    I looked at the hot water cylinder and Im not sure whats what.
    I see 4 red gate taps but it looks to me that you have to empty the cylinder to do any work.
    can anybody help describe my system from the photo ?
    http://media.diynot.com/207000_206023_63718_45636458_thumb.jpg

    thanks
    Lee
     
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  3. D shuts off HW, A will probably go to a shower, the rest are for CH.
     
  4. leebarlow

    leebarlow

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    thanks for the reply :)
    I thought that the hot water was drained from the top of the tank ?
    Valve D pipes off the bottom ..are you sure thats where my hot water and shower would come from

    BTw I do have a gravity fed shower

    Can anybody tell me what the other pipe above A will supply ?

    thanks
    Lee
     
  5. Pipe above A is the HW supply to the whole house, valve D is on the CW supply pipe to the cylinder which enters at the bottom of the cylinder & pushes the HW out of the top based on the fact hot water rises.
    When you shut of the HW you don't actually drain the cylinder you just stop the water flowing through it, even when the water stops you will always have a cylinder full of residual water until you either drain off from the drain off valve on the elbow or syphon it off.
    If pipe A is going to your shower the you do have a gravity fed shower & your CH system is a Y plan.
     
  6. leebarlow

    leebarlow

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    thanks I understand this much better now.
    So can I ask how come the central heating seems to feed from the bottom of the tank ??
    Also do you have any idea what that pipe is half way up the cylinder ?

    thanks for all your help
     
  7. The pipe half way up on the left side is the flow, if you follow the pipe back it goes to a 3 port valve (the bit with the silver box marked Honeywell), this is the bit that gives you CH & HW or CH or HW only. The pipe on the bottom is the return these feed the coil inside the cylinder which in turn heats the water.
     
  8. Jibbs

    Jibbs

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    Hello leebarlow

    Point D is where you can turn off the hot water as this pipe is feeding the cyclinder from the tank. Just open up the various hot water taps in the house and drain the water down. The water is drained down from the pipes leading to the hot water taps and the top of the cyclinder.

    The central heating heating feeds from the bottom of the tank as hot water is primary and central heating is secondary.

    Hope i've explained it okay :)

    P.s. may be worthwhile installing 2 isolating/ service valves on the cold and hot water pipes to the bath in case you want to change the taps or have problems in the future
     
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