Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi all,
Vanilla are planning an update to the site on April 24th (next Wednesday). It is a major PHP8 update which is expected to boost performance across the site. The site will be down from 7pm and it is expected to take about an hour to complete. We appreciate your patience during the update.
Thanks all.

Riello G5X "50V" Capacitor.

Options
  • 21-09-2020 7:52pm
    #1
    John.G
    Registered Users Posts: 3,466 ✭✭✭


    Riello G5X burner fitted in 15 year old Firebird Boiler was making buzzing sound which would point to a faulty capacitor, however I found that the fan was binding in its housing. I duly freed up same and burner fired up.
    This burner motor is 50V and is started wit a 4UF capacitor, the original capacitor shown has a screw stud on its end which means it can be neatly attached to the fan housing.

    My query is would any 4UF capacitor be OK to use if this one failed and a OEM spare wasn't available.

    Energy monitor numbers from motor: 235V, 0.645A, 0.70 PF, 105.5W.

    Edit: Got a bit mixed up, the motor is actually 230V but sends 50V to the control box so no query really.


Comments

  • Options
    #2
    whizbang
    Registered Users Posts: 1,924 ✭✭✭whizbang


    my experience would say yes, anything similar will work,

    Generally I find the bigger the capacitor, the more robust.


  • Options
    #3
    [Deleted User]
    Posts: 7,499 ✭✭✭ [Deleted User]


    I'll just add that the 50v is the max voltage it can take.
    You could use a 4uf 100vor 4uf 200v etc if you can't get the 50v


  • Options
    #4
    John.G
    Registered Users Posts: 3,466 ✭✭✭John.G


    BrownFinger wrote: »
    I'll just add that the 50v is the max voltage it can take.
    You could use a 4uf 100vor 4uf 200v etc if you can't get the 50v

    As per my edit above, the motor is actually 230V, the 50V is generated in the motor via a transformer and is the supply for the control box, its one of the fault finding items if burner not working......"check for 50V on the white wire, if no voltage then replace the motor" any idea why the 50V is supplied this way and not from a external transformer?, maybe space saving?.

    Back to the capacitor, the OEM supplied one seems to give a very very long life, mine is still going strong at 15 years and a relation has one +17 years. I read somewhere that the higher the voltage rating the better. This capacitor has 450V A, 475V B and 500V C with other numbers stamped on it, maybe this is of some significance regarding longevity, presumably there is a hour rating for different quality/grades.


  • Options
    #5
    brightspark
    Registered Users Posts: 2,637 ✭✭✭brightspark


    In general it is okay to replace a capacitor rated with one rated for a higher voltage. Unless you really know what you are doing you should never use one with a lower voltage rating.

    A different value of capacitance (Farad) will affect the starting torque etc.

    As regards the ABC values.

    https://www.ien.com/product-development/article/20850180/understanding-selecting-capacitors

    In this standard, different class ratings specify different field life for capacitors. The different class ratings depend on the amount of test hours that a capacitor goes through.

    Class A specifies an applied life of 30,000 hours
    Class B specifies an applied life of 10,000 hours
    Class C specifies an applied life of 3,000 hours
    Class D specifies an applied life of 1,000 hours


  • Options
    #6
    John.G
    Registered Users Posts: 3,466 ✭✭✭John.G


    Mine based on its 15 year life and ~ 8100 hour (burner) run time might see my boiler out so.


  • Advertisement
Advertisement