Adding Sentinel Rapid Dose to Radiator

Discussion in 'Plumbing and Central Heating' started by f1arp72, 29 Apr 2015.

  1. f1arp72

    f1arp72

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    Hi.

    I apologise if this is a daft question, but I need to add some Sentinel X200 to my system and am interested in the Rapid Dose system for ease.

    However, I was wondering how it works with the Open Vented System that I have.

    If you close off a radiator, and add the dose via the bleed valve, surely there isn't "room" in the radiator for the X200 due to the fact it's full of water. Surely just letting the water drain from the bleed valve first doesn't release enough water due to the fact it's a top of the radiator!!

    Am I missing something. Do you need to partially drain radiator (in which case I may as well drain system a bit until F&E tank has emptied.

    Thanks
     
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  3. oldbuffer

    oldbuffer

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    Close both radiator valves, noting 1/4 turns required to fully close. (If TRV, note position number).
    Remove bleed screw.
    Attach Rapid Dose
    Open one radiator valve.
    Inject Sentinel.
    Close radiator valve.
    Remove Rapid Dose.
    Replace bleed key and tighten.
    Open both valves to original number of 1/4 turns
     
  4. f1arp72

    f1arp72

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    Thanks, but if the radiator is already full up with water, how is there room to inject more liquid, or will removing the bleed screw allow enough water to drain before injecting Sentinel ?
     
  5. oldbuffer

    oldbuffer

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    Closing both valves initially enable you to remove the bleed screw and connect the Rapid Dose without any significant leakage.

    Opening one radiator valve while the Sentinel is injected, enable the extra liquid to displace water from the base of the radiator into the pipe work and feed and expansion tank.

    Closing that one valve after injection enables you to remove the Rapid Dose and re-insert the bleed screw, again without significant leakage.

    Then open both valves to their previous positions to put the system back as it was previously.
     
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  7. footprints

    footprints

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    It works!
    Trust me, I'm a builder! ;) ;) ;)
     
  8. JohnD

    JohnD

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    With an open vented system, there is no need to try and squeeze it into a radiator
     
  9. footprints

    footprints

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    The only ones it will not work on are the vents that have a little hole on the side for the water to escape from ('cos it will squirt it in your eye!)often seen on ladder rads.

    As said you can just add it to the tank but the nice thing with injecting is you KNOW it is all in the system and not some just left in the tank. ;)
     
  10. f1arp72

    f1arp72

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    Ah, that makes perfect sense now !! Thanks for clarifying that.

    Is it better to do it on an upstairs radiator (less volume of water to push upstairs against gravity as the X200 displaces some to get into the radiator) ??

    Yeah, I'm in two minds whether to do it the old fashioned way via feeder tank but thought the Rapid Dose looked easier as no need for the hassle of partially draining system. Just being lazy I guess !! :oops:
     
  11. DIYnot Local

    DIYnot Local

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