Troubleshoot challenge!Bad transformer? - Page 2
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  1. #14
    Join Date
    Jul 2004
    Location
    midwest
    Posts
    2,868
    Do you no the difference between sequencers and contactors?

  2. #15
    Join Date
    Mar 2005
    Posts
    65
    That wasn't fair.Contactors use magnetism, sequencers use a bi-metal activated by heat and the two do not even look the same!My point is how the heck does an instructor not no the visual difference between the two at a glance. I mean the wires from the heating elements went directly to the sequencers and he was pointing to the contacters.Sequencers are time delay switches and magnetic switches open and close instantly.

  3. #16
    Join Date
    Apr 2004
    Posts
    7,680
    Ive seen older ones without sequensers, they simply had quiet contactors and limits... Maybe, just maybe you were looking at limits.

  4. #17
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    Some new airhandlers have contactors instead of sequences.
    Karst means cave. So, I search for caves.

  5. #18
    Join Date
    Mar 2005
    Posts
    65
    Fair enough. I'll check it out, but the contactors were not wired to the elements to be fair to me.My memory tells me these "sequencers had low voltage connections for the "load" of the switch, and separate connections for the power they were passing, but I will make sure.Limit switches don't have the same visual as sequencers, so I know I'm right.Same instructor said you could get total cfm from a gas furnace by amping out blower motor and using formula amps x volts = watts x 3.413 = BTU'S and dividing TD x 1.o8 into those BTU'S!Insane.

  6. #19
    Join Date
    Jan 2002
    Location
    Ft.Worth,Tx
    Posts
    4,584

    Unhappy Remember when

    That's nothing 1984 had a technician out of ATI school told me he needed to learn a little bit. The first couple of days he rode with me I asked some simple questions and he could not answer not even one.I walk him through a few calls in the summer as it was almost over and fall start up were soon. I asked if he new about heat pumps, oh yea our teacher was a heat pump specialist. The first unit we did was Coleman Heat Pump I siad go ahead and hook up my gauges ,I am going inside to check filter and blower and turn on thermostat. Came back to my New brass gauges were on the wrong lines, I thought you said you knew heat pumps.

    Well, I got a couple of new gauges and after alot of work he turned out to be a great technician, he now works for Dyna-Ten Corp.and works on high rise buildings.
    "Everyday above ground, is a good day".
    "But everyday that you have made a difference in someones life, may insure you stay above ground a little longer".<aircooled>

  7. #20
    Join Date
    Jul 2004
    Location
    midwest
    Posts
    2,868
    I new a young man once that knew quite a bit and thought he knew everthing. Now I just wish I knew what I thought I did at 25. You are probably at the top of your class and I can tell that you know quite a bit, but trying to prove it on this board will be one challenge after another. It takes someone that wants to learn (like you) to ever make it in this field and it would seem that you are on your way. I once was in a school like you and most students were there to get out of something else and not because they wanted to to be. This was a tech. school in high school.

    [Edited by trane on 03-08-2005 at 08:48 PM]

  8. #21
    Join Date
    Mar 2005
    Posts
    65
    Teacher also said the way to get amp load on electric furnace is to amp out both hot legs, ADD THEM TOGETHER,and then whatever.Point is, everyone screws up and I am scared to think of my future screw ups when I enter the FIELD, but a teacher at a reputable trade school with students paying $20,o00 plus who is so incompetent is inexcusable.The industry should step in to ensure future technicians know their %&^& from the proverbial hole in the ground. This is my last post on this thread.

  9. #22
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    I know my A$$ from a hole in the ground, I'm a caver.
    Karst means cave. So, I search for caves.

  10. #23
    Join Date
    Jan 2005
    Location
    Seattle
    Posts
    191

    Talking Hole in the ground

    karsthuntr.
    So there cave man.How many trips DID it take to get out of the ground? <:}
    41Gasman


  11. #24
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    You will have to ask my wife after I die. I can't get out because I keep going in.
    Karst means cave. So, I search for caves.

  12. #25
    You might be a hack if you measure a ac control circuit to ground. I can't believe that instructor would teach that! Another thing, make sure voltage is still present while the circuit is under load.

  13. #26
    Technical schools.

    We hired a few guys from U.T.I., we rename that school as Un Trained - Idiots

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