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Thread: out of ideas

  1. #27
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    Dec 2009
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    Buffalo, N.Y
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    Quote Originally Posted by tipsrfine View Post
    Ten ft of wire, a terminal block and a contactor-plenty enough room for something going to ground causing high amps, but not enough to cause a voltage drop. Get a virgin supply of 240 going to it that motor-preferably at your shop for peace of mind-and if amps are normal go back and find that grounding issue. I'm no where near some of these other guys, or you probably, in experience. I do know that when something just don't make sense it's because something you're assuming to be right is not.
    I love that last sentence.

  2. #28
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    Quote Originally Posted by DeltaT View Post
    What's the make and model of this unit? Something doesn't add up.

    I think on your first post you mentioned too much humidity? You can't reset the air temp back if this is a typical pool dehumidification system as on reset the running of the compressor will overheat the pool water resulting in too much humidity and loss of the envelope control of the room.

    Make and model of the unit to see the original design concept would be of great help.
    This is an E.P.S. Dry-Air unit. M# hd96, serial # in my van, I'll find that later. The pool cover is designed as a vapor barrier, and I was told by the engineer and read in job specs that the room temp can be set back to any desired temp as long as humidistat is kept at or below 60%. I'll be the first to admit pool rooms and natatoriums are not my specialty, but this sounded reasonable to me. The pool will not overheat because of heat rejection of this unit. Pool temp is monitored and I have the ability to reject excess heat to the geothermal field.

  3. #29
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    Seattle, WA
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    7,756
    "The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money.
    - Alexis de Toqueville, 1835

  4. #30
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    Quote Originally Posted by fruecrue View Post
    I love that last sentence.
    To explain that last sentence so it means something: It's like doing math and you are adding up 2+2=4, but you keep getting 0. Then you realalize one of those 2's is a negative 2. Same thing when you're trying to diagnose a problem. Example: I've been adding a lot of refrigerant to this unit and I don't understand why my pressures are not going up. Problem:I assumed my gages were right. What didn't make sense: There's no way I added this much refrigerant and my pressures havn't gone up. Solution: Maybe my gages are broke.

    I just saw the similarity in your statement about the ten ft. of wire, terminal block, contactor, nothing wrong with the wires, a new motor with correct voltage, no load, and high amps=wtf. If all you said was correct and there was not a missing variable, then the motor would draw normal amps. Either there is a missing variable affecting the equation or one of the factors used in the equation is incorrect. This is my brain on service.

  5. #31
    Join Date
    Dec 2006
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    Middle Tennessee
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    *

    Quote Originally Posted by fruecrue View Post
    New motor runs the same, 12.6 amps. Motors all the same- 208/230 single phase. Line voltage is 246.5 with unit off, 244.9 running. Block the return air with cardboard- 12.6 amps. run without belt, 12.6
    exactly how are you obtaining amp draw?

    i bet your adding both leg's together, that's not how it's done!



    .

  6. #32
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    Sep 2008
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    Western PA
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    Quote Originally Posted by Airmechanical View Post
    exactly how are you obtaining amp draw?

    i bet your adding both leg's together, that's not how it's done!



    .
    How could he be doing that and still cooking the motor windings and cycling on overloads?

    Doesn't make sense.

  7. #33
    Join Date
    Jul 2006
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    6,486
    Wrong motor ? Strange, if the manufacturer cant help you go vsp and see what happens?
    You sure are cocky for a starving pilgrim.

  8. #34
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    Jul 2007
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    Mount Airy, MD
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    Someone here mentioned the blower curve, forgive me for being to lazy too see whom, but that is where ya need to start.

    I see a lot of this and that and no actual data, i.e. STATIC?? is this thing in cavitation? do we have an over-sized duct and no static? etc...

    The designed blower curve chart for your application, at designed static, at designed RPM and blah blah blah is doing what real world?? way out of specs?

    wrong this and that, possible? but doubt it, your missing something here...

  9. #35
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    Quote Originally Posted by Chris_Worthingt View Post
    Someone here mentioned the blower curve, forgive me for being to lazy too see whom, but that is where ya need to start.
    sorry, but the motor is overamping without a load, forget about the blower curve until the initial motor problem is diagnosed

    JP after further review, i agree, with what you said about it overloading, so he probably did not take a false readings

    is it a dual voltage motor, maybe wired incorrectly


    .

  10. #36
    Join Date
    Dec 2003
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    2,390
    Can this unit pull in return air and/or outside air? Im wondering if the resistance of the return air duct is more than if its pulling outside air. Maybe when it goes to outside air there is less resitance and the fan loads up more.

    If you get another motor, go to a 3hp. Make sure the wiring is adequate for the upgrade.

  11. #37
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    Quote Originally Posted by Airmechanical View Post
    sorry, but the motor is overamping without a load, forget about the blower curve until the initial motor problem is diagnosed

    JP after further review, i agree, with what you said about it overloading, so he probably did not take a false readings

    is it a dual voltage motor, maybe wired incorrectly


    .
    Agreed.

    Since it is an overamping/overheating problem, the place to start is on the supply side. You have, what, 3 motors from 2 manufacturers? Nah. Not a motor problem anymore. At least that's my take.

    Power each motor from a good power source. Take them off site to do it if needed, and take readings again.

    I'm thinking that you have a power supply problem either within the unit or in the building as a whole.

  12. #38
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    Jul 2007
    Location
    Mount Airy, MD
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    So your saying an oversized/undersized/caveatting blower motor will not run hot/over amped? I find this hard to believe http://lmgtfy.com/

    Why would one, not consider the designed curve as a tool for diagnosis to a problem with the blower motor/section?

    The OP has apparently checked the incoming power supply, so now we just blindly change parts at random till it works? makes no sense to me, I would check the fundamentals and go from there ;-)

  13. #39
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    Jan 2008
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    michigan
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    Quote Originally Posted by Chris_Worthingt View Post
    So your saying an oversized/undersized/caveatting blower motor will not run hot/over amped? I find this hard to believe http://lmgtfy.com/

    Why would one, not consider the designed curve as a tool for diagnosis to a problem with the blower motor/section?

    The OP has apparently checked the incoming power supply, so now we just blindly change parts at random till it works? makes no sense to me, I would check the fundamentals and go from there ;-)
    He ran the new motor with no load and still was over FLA

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