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Relay problem

Discussion in 'Electronic Basics' started by Pooh Bear, Jan 26, 2006.

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  1. Pooh Bear

    Pooh Bear Guest

    Many possibles. Get a heating engineer in to look at it.

    Graham
     
  2. Art

    Art Guest

    Inproper current draw, unregulated control voltage, protective circuits,
    maultple things. As suggested, HVAC Technician time, would probably save you
    a bunch in the long run.
     
  3. Rich Grise

    Rich Grise Guest

    It's ON-topic for s.e.basics, so no worries on that account. The only
    OFF-topic questions on s.e.b are those that don't involve electrons in one
    way or another. ;-)

    I'd look at the physical condition of the relay, like dirt or some
    obstruction; and check all of the connections in the relay's coil
    circuit. It sounds like it's not pulling in fully.

    It used to work, and this symptom appeared recently, right?

    Thanks,
    Rich
     
  4. Chris

    Chris Guest

    Hi, Rich. Always good to hear from you. Nice to see you're spending
    some time amidst us groundlings on s.e.b.

    You're right, it's probably a good idea to look at the physical
    condition of the relay first. Since it's a heating application, I'd
    guess it's probably an AC relay, so I'd also suspect a partial short in
    the coil, or a loose shading ring. Sometimes the shading ring comes
    loose, and can be snapped back into place.

    http://www.geindustrial.com/pm/notes/artsci/art02.pdf

    Less likely, the thermostat or sensor switch driving the relay might
    not be closing fully, or has gotten resistive.

    Best solution might be to replace the relay, and see if that solves the
    problem. If it doesn't, the solution is probably in the switch or
    thermostat.

    I hope this does something to improve the knowledge : baggage ratio.

    Good luck
    Chris
     
  5. Guest

    This could be OT, but I'm posting here to get replies with no
    baggage....
    I have a relay in my boiler which buzzes/arcs I'm trying to diagnose
    the fault, probably in my wiring. What conditions (eg shorting) would
    cause a relay to switch on & off very rapidly (leading to a buzzing
    noise) & arc?
    Many thanks
    Jonathan
     
  6. Oh, puh-leeze! I'm a groundling too, just I've been in the trenches for
    going on forty years. ;-) (i.e., I've learned the difference from my
    elbow to a hole in the ground. I made up that expression by incorporating
    two old cliche's[1], by the way. I've heard it on TeeVee. Anyway....

    Admittedly, the accolades make my ego get too big for the cubicle, and it
    makes me want to dance and shtuff, but please don't gush!

    I got a stipend from a benefactor once, (benefactress, actually, but I
    don't want to be sexist), and when I went to kiss her feet, she said,
    "Oh, don't grovel!" If you want to find somebody to fawn at the feet of,
    lurk for awhile. ;-)
    <AOL>
    Me, Too!
    </AOL> ;-)

    Cheers!
    Rich
    [1] apostrophe used in lieu of accent grave
     
  7. John Fields

    John Fields Guest

    ---
    If the boiler and all the rest of it is brand new, and you wired it
    together and it doesn't work right, guess what... It's probably your
    wiring that's at fault.

    You've posted no schematics, nothing about what the problem is other
    than that the relay is buzzing, and nothing about what you've done
    to isolate the problem, and yet you seem to expect us to pinpoint
    the solution for you because you say you can't afford to have a
    professional come in and do it properly.

    What's wrong with that picture?...
     
  8. Guest

    Graham & Art wrote,
    HVAC Technician time, would probably save you
    a bunch in the long run.
    Many possibles. Get a heating engineer in to look at it.

    Thanks - I am somewhat impecunious at present & also trying to check
    whether my wiring is at fault or if therelay is defective from new -
    and therefore who should foot the bill. If I had the cash I would
    quite happily call an engineer. In fact, if I'd had several grand
    spare, I would have got a pro to install the whole CH system and save
    me a lot of time & effort. But I haven't.

    Rich Grise wrote:
    I'd look at the physical condition of the relay, like dirt or some
    obstruction; and check all of the connections in the relay's coil
    circuit. It sounds like it's not pulling in fully.

    It used to work, and this symptom appeared recently, right?

    The boiler & all controls are brand new, so it SHOULDN'T be u/s.
    No, the arcing was there at the start. I looked at Schrack's website
    at the spec, hoping the relay was plug-in rather than soldered in
    directly, but alas not. I can't see into the casing of the relay as
    it is too small & too crowded. I don't want to go opening stuff up
    until I know the fault is mine not the boiler manufacturers.
     
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