Page 3 of 3 FirstFirst 123
Results 41 to 49 of 49

Thread: Calling my electric teacherís bluff

  1. #41
    Join Date
    Apr 2021
    Posts
    12
    Post Likes
    thats Capactier series i'm Right?

  2. #42
    Join Date
    Aug 2019
    Location
    Maryland
    Posts
    90
    Post Likes
    Thread Starter
    Quote Originally Posted by VTP99 View Post
    Are we really to discuss higher voltage now ?
    Same principles, just the stakes are higher, why not


    Sent from my iPhone using Tapatalk

  3. #43
    Join Date
    Jul 2000
    Location
    Northern Wisconsin
    Posts
    3,149
    Post Likes
    Quote Originally Posted by Sabr7 View Post


    Context: this is the 24 volt side of a 120 input transformer.

    So he said the last line will cause a direct short. Really? One line is hot and neutral so if there is ever a direct connection, Iím thinking it would be a return path for the power.

    If it were 3 phase, and phase to phase connection then I would agree.

    If Iím wrong, Iím all ears for an explanation.


    Sent from my iPhone using Tapatalk
    That's why it's called a ladder diagram and not a stepladder diagram. The ladder concept is: components are the rungs and the transformer is the dirt/floor it's sitting on.
    Use the biggest hammer you like, pounding a square peg into a round hole does not equal a proper fit.

  4. #44
    Join Date
    Jan 2010
    Posts
    22,862
    Post Likes
    Gets a bit more tricky with power coming at you from to different directions.

  5. #45
    Join Date
    Dec 2000
    Location
    alabama
    Posts
    536
    Post Likes
    Quote Originally Posted by dandyme View Post
    You will definitely come to the realization that all things electrical operate on magic smoke, let that magic smoke out and the electric item will cease to operate.
    Yes exactly

    Working on a device now that puts the magic smoke back in

    Unsuccessful at this time l just keep time traveling

    Dang you canít have nothing

  6. Likes R600a liked this post.
  7. #46
    Join Date
    Mar 2018
    Posts
    101
    Post Likes
    There is a replacement smoke kit for british cars, so maybe someone will make one for HVAC.

  8. Likes VTP99, heatingman, BBeerme liked this post.
  9. #47
    Join Date
    Jul 2007
    Location
    Beautiful, Philadelphia, the City of Brotherly Love!
    Posts
    1,261
    Post Likes
    For a more dramatic answer: Cut of the power cord to a lamp, twist the wires together and then plug into any nearby outlet. The lights going off will be due to the circuit breaker seeing a dead short. The same would be true for your transformer, you'd be letting the smoke out and that voids the warranty.
    ďYou don't get paid for the hour. You get paid for the value you bring to the hour.Ē Jim Rohn

  10. #48
    Join Date
    May 2014
    Location
    Bay Area California
    Posts
    30,729
    Post Likes
    There is something wrong, or maybe I should say 'not complete'. It's very likely, if you were at the stat, there was something not connected at the unit.

    If you have a normal system and the operations are normal, and measuring from R to Y on the thermostat, you would get ~24 volts. The main reason is because with the newer stats out these days, you have to pull the stat off of the sub base to get to the connections.

    On older mercury bulb stats you could often get to some electrical without unscrewing the stat from the sub base.

    Usually when you see something like 3 volts, it's because of the meter. Meaning, that if you had an old analog meter, one that actually a needle that moved instead of a digital readout, you would see zero volts. You see, the meters we typically use every day are EXTREMELY sensitive.


    Quote Originally Posted by Sabr7 View Post
    While weíre on the topic of electricity, I measured from R to Y on a thermostat (24v control) and got 3.7 volts. It wasnít calling for cooling. The tech I called said itís back EMF.

    What causes this? Sorry for getting all theoretical.


    Sent from my iPhone using Tapatalk
    I do a triple evac with nitro to remove non condensables.

  11. #49
    Join Date
    Apr 2020
    Location
    Garner NC
    Posts
    3,576
    Post Likes
    Letís have more fun and throw dual (RA and SA )smoke detectors in it! With 120v powered fire dampers connected to the load side of the GFCI Lol..

  12. Likes R600a liked this post.
Page 3 of 3 FirstFirst 123

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •