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Power flushing

  • 30-01-2013 1:07pm
    #1
    Dtp79
    Closed Accounts Posts: 2,097 ✭✭✭


    Anybody any tips for powerflushing underfloor heating? Anything different to a normal system?


Comments

  • #2
    shane0007
    Closed Accounts Posts: 4,677 ✭✭✭shane0007


    Dtp79 wrote: »
    Anybody any tips for powerflushing underfloor heating? Anything different to a normal system?
    Are their rads also installed or just UFH? There are certain procedures for PFing UFH.


  • #3
    Dtp79
    Closed Accounts Posts: 2,097 ✭✭✭Dtp79


    shane0007 wrote: »
    Are their rads also installed or just UFH? There are certain procedures for PFing UFH.
    No rads just underfloor Shane.


  • #4
    shane0007
    Closed Accounts Posts: 4,677 ✭✭✭shane0007


    Dtp79 wrote: »
    No rads just underfloor Shane.
    What's the issue?


  • #5
    Dtp79
    Closed Accounts Posts: 2,097 ✭✭✭Dtp79


    shane0007 wrote: »
    What's the issue?
    Some zones not heating. One in particular. System was badly installed.


  • #6
    shane0007
    Closed Accounts Posts: 4,677 ✭✭✭shane0007


    Why do think its a sludge issue that requires a powerflush?


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  • #7
    Dtp79
    Closed Accounts Posts: 2,097 ✭✭✭Dtp79


    shane0007 wrote: »
    Why do think its a sludge issue that requires a powerflush?
    Very black water for a start. I've tried to get other zones working but nothing. Can't think of much else to do with it


  • #8
    shane0007
    Closed Accounts Posts: 4,677 ✭✭✭shane0007


    If the water is very black there is an underlying problem with oxygen entering the system. Check the barrier pipe & see if it is oxygen free. The older ones (10 years plus) were not & oxygen seeps through the pipe. Also check for leaks/seeps under each actuator.

    To powerflush, heat the system before you arrive. Turn off & isolate the manifold, via the isolation valves. Remove the UFH pump, isolating the electrics to same. Powerflush the system from there. You will need to remove each actuator & bring some closing caps. Note the flow rate settings. Open & powerflush each circuit individually, removing the closing cap for each circuit. Re-instate each flow regulator.

    You will need to repeat this for each manifold, possibly reheating the system before moving on.

    Finally, close off the all the manifolds & powerflush via the boiler pump, opening any bypass valves to the closed manifolds. Open the cylinder balancing valve & flush the primary circuits.


  • #9
    shane0007
    Closed Accounts Posts: 4,677 ✭✭✭shane0007


    You could also take a sample of water from the system, buy a Fernox test kit for €25. Send it off to Fernox & they will return a full analysis of the system, so you will know if it is an oxygen issue or a electrolysis issue.


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