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Non Return Valve

  • 01-09-2010 8:37am
    #1
    Pataman
    Registered Users, Registered Users 2 Posts: 1,543 ✭✭✭


    Hi
    I have my solar installed for about a year, all working well. However I just realised I forgot to install a non return valve. Is it really necessary?

    Cheers
    Pat


Comments

  • #2
    Evergreen
    Registered Users, Registered Users 2 Posts: 254 ✭✭Evergreen


    There is probably a NRV built into your pump station, if it is a twin line pump station there may even be two built in NRV's

    If you have no NRV then the heat from your hot water cylinder can flow backwards through the panels when the pump switches off. It will cool your tank off pretty quick in the night time, handy for keeping your panels frost free in the Winter though:D


  • #3
    Pataman
    Registered Users, Registered Users 2 Posts: 1,543 ✭✭✭Pataman


    Hi I dont have a pump station. Just a pump, pressure vessel etc. THanks for your reply, i will fit one soon.


  • #4
    Evergreen
    Registered Users, Registered Users 2 Posts: 254 ✭✭Evergreen


    If you are going to fit an NRV make sure that you use a solar rated one, ie one that can be used with glycol and rated up to 160 degrees. If you use a standard NRV the plastic ball will just melt in it


  • #5
    Pataman
    Registered Users, Registered Users 2 Posts: 1,543 ✭✭✭Pataman


    Will do. Do you usually get temperatures over 100? Mine only go to a max of 47C, thats from the thermostat on the tubes.


  • #6
    Evergreen
    Registered Users, Registered Users 2 Posts: 254 ✭✭Evergreen


    I have 3 x 2.1 meter Austrian panels on my roof for the last 5 years, at the moment they are reading 55 degrees on the roof. It is Midday and overcast.

    During the Summer my panels often went up to 120 degrees


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  • #7
    reverenddave
    Registered Users, Registered Users 2 Posts: 805 ✭✭✭reverenddave


    Pataman wrote: »
    Will do. Do you usually get temperatures over 100? Mine only go to a max of 47C, thats from the thermostat on the tubes.


    WOW 47 seems pretty shít there must be something wrong somewhere

    OH WAIT it's because you have no NRV :D

    yeah i'd get that fitted as soon as possible :D


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