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Rads

  • 31-10-2018 4:24pm
    #1
    cosmowillie53
    Registered Users Posts: 445 ✭✭


    Hi folks..
    A quick question on bleeding rads...
    I have a small single story cottage with six rads..One Slow to heat up so I was thinking it may need to be bled. Other haven't been touched in a few years..
    Q. Should they be done when cold or warm and should they all be done..
    Thanks for help.


Comments

  • #2
    cosmowillie53
    Registered Users Posts: 445 ✭✭cosmowillie53


    cosmowillie53 wrote: »
    Hi folks..
    A quick question on bleeding rads...
    I have a small single story cottage with six rads..One Slow to heat up so I was thinking it may need to be bled. Other haven't been touched in a few years..
    Q. Should they be done when cold or warm and should they all be done..
    Thanks for help.

    Can I have this moved to diy ?


  • #3
    Lumen
    Registered Users, Registered Users 2 Posts: 31,166 ✭✭✭✭Lumen


    I do mine when they're warm.

    Do them all. Why wouldn't you?

    Don't over think it.


  • #4
    Dtp1979
    Registered Users, Registered Users 2 Posts: 12,852 ✭✭✭✭Dtp1979


    Lumen wrote: »
    I do mine when they're warm.

    Do them all. Why wouldn't you?

    Don't over think it.

    Cause potentially it can work in reverse and you’d end up sucking air into the rad if the heating is on


  • #5
    listermint
    Registered Users, Registered Users 2 Posts: 34,138 ✭✭✭✭listermint


    Dtp1979 wrote: »
    Cause potentially it can work in reverse and you’d end up sucking air into the rad if the heating is on

    Not if you let the water properly piss out.

    I've never had a problem with sucking air back in


  • #6
    Dtp1979
    Registered Users, Registered Users 2 Posts: 12,852 ✭✭✭✭Dtp1979


    listermint wrote: »
    Not if you let the water properly piss out.

    I've never had a problem with sucking air back in

    I’m plumbing 20 years and I have.


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  • #7
    Lumen
    Registered Users, Registered Users 2 Posts: 31,166 ✭✭✭✭Lumen


    Dtp1979 wrote: »
    I’m plumbing 20 years and I have.
    But wouldn't that mean the system is under pressurized?


  • #8
    Dtp1979
    Registered Users, Registered Users 2 Posts: 12,852 ✭✭✭✭Dtp1979


    Lumen wrote: »
    But wouldn't that mean the system is under pressurized?

    It’s nothing to do with pressure. Pump speeds/position and badly piped systems play a big part.


  • #9
    quazzy
    Registered Users, Registered Users 2 Posts: 1,315 ✭✭✭quazzy


    Dtp1979 wrote: »
    It’s nothing to do with pressure. Pump speeds/position and badly piped systems play a big part.

    So whats the best process for bleeding rads? Heating On /OFF? Start with upstairs or downstairs. (I know OP is about bungalow but for those with 2 stories).

    regards,

    Q


  • #10
    listermint
    Registered Users, Registered Users 2 Posts: 34,138 ✭✭✭✭listermint


    Dtp1979 wrote: »
    I’m plumbing 20 years and I have.

    If theres water coming out, Air is not coming back in though....


  • #11
    muffler
    Registered Users, Registered Users 2 Posts: 46,408 ✭✭✭✭muffler


    listermint wrote: »
    If theres water coming out, Air is not coming back in though....
    Agreed. I bleed my rads when necessary just after I switch the heating on thus ensuring that the air is pushed out of the system and not the other way round.


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  • #12
    cruizer101
    Registered Users, Registered Users 2 Posts: 3,205 ✭✭✭cruizer101


    I'm no expert but slow to heat up doesn't really say need to be bled to me.
    Need to be bled means air is trapped in it which results in cold at the top part of radiator and warm further down. That said no real harm in giving bit of bleed to ensure no air in them.

    Slow to heat up could be that they need to be balanced, although unless some changes have been made recently I don't think that should be case.
    Possibly also sludge build up.

    Edit to add you might be better in plumbing forum to get better advice on diagnosing problem


  • #13
    Markcheese
    Registered Users, Registered Users 2 Posts: 8,644 ✭✭✭Markcheese


    Anyways, get an absorbant cloth, get a rad key, and bleed them..
    The system mightnt be properly "balanced" which could be why they one or two rads aren't heating properly (basically the rads may need tweaking to adjust the flow of hot water so they all heat evenly)
    Or after 20 years you could well need to get a plumber in to do a system flush... (clear all the crap/sludge out of the pipes rads and boiler...
    Any who have a go

    Slava ukraini 🇺🇦



  • #14
    Dtp1979
    Registered Users, Registered Users 2 Posts: 12,852 ✭✭✭✭Dtp1979


    listermint wrote: »
    If theres water coming out, Air is not coming back in though....

    Yes I know. Can you distinguish the sound between air sucking and air blowing?


  • #15
    Dtp1979
    Registered Users, Registered Users 2 Posts: 12,852 ✭✭✭✭Dtp1979


    listermint wrote: »
    If theres water coming out, Air is not coming back in though....

    If there’s water coming out it dosent need to be bled


  • #16
    Dtp1979
    Registered Users, Registered Users 2 Posts: 12,852 ✭✭✭✭Dtp1979


    If it’s slow to heat there’s a good chance the balancing valve on the cylinder is fully open.


  • #17
    cruizer101
    Registered Users, Registered Users 2 Posts: 3,205 ✭✭✭cruizer101


    Dtp1979 wrote: »
    Yes I know. Can you distinguish the sound between air sucking and air blowing?

    How does air get sucked in to rads?
    The pressure would have to be lower than outside, can't understand how that would happen.
    Maybe in sealed system with leak but even then would it pull a vacuum?


  • #18
    Dtp1979
    Registered Users, Registered Users 2 Posts: 12,852 ✭✭✭✭Dtp1979


    cruizer101 wrote: »
    How does air get sucked in to rads?
    The pressure would have to be lower than outside, can't understand how that would happen.
    Maybe in sealed system with leak but even then would it pull a vacuum?

    I’m only talking about when the heating is on and there being potential for this to happen if a few things line up


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