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  1. Replies
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    You could check for a phantom voltage or backfed...

    You could check for a phantom voltage or backfed voltage by putting a 100w incandescent bulb across this voltage and see if the 120v holds up.

    On a normal 120v house outlet with this bulb you...
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    Funny you should mention that. . . The average...

    Funny you should mention that. . .
    The average age of the worlds greatest civilizations has been two hundred years [I've heard 500] . These nations have progressed through a nine stage sequence:
    1...
  3. Follow up: "I had the coolant put in this...

    Follow up:
    "I had the coolant put in this morning. It took a little less than an hour. The system was checked for leaks. Total cost: $[xxx].-
    Yesterday I contacted my mechanic (whom I trust). He...
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    You'd think the Federal Trade Commission would...

    You'd think the Federal Trade Commission would prevent this kind of stuff from being sold here.

    Maybe they are described by
    "Regulatory capture occurs when a regulatory agency, created to act in...
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    I hope they value human life more than NASA. ...

    I hope they value human life more than NASA. I've read accounts of the reasons for the shuttle failures and when I was at NASA as a contractor I read a memo detailing possible reasons for the loss...
  6. I think 'll tell her: "Less than 1 hr to...

    I think 'll tell her:
    "Less than 1 hr to recharge and wait to see if it leaks. For very slow leaks just keep recharging once in a while."
    Thanks.
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    JKopp's attachment claimed a 60,000 hr MTBF and...

    JKopp's attachment claimed a 60,000 hr MTBF and you had [<3 mons x 24 hr/day x 30 days/mon]/10 = <216 hr MTBF. If the AC ran half the time it's a 400 hr MTBF.

    Bad caps, or severe abuse from some...
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    If they estimate getting back 120M in revenue or...

    If they estimate getting back 120M in revenue or prestige then they give this thing a 50-50 chance of working in the near term.
  9. The two estimates she got several years apart...

    The two estimates she got several years apart were '5 minutes' and '1 hour' so I'm leaning toward telling her "about 10 minutes" to refill & check & repair leaks.

    Thanks.
  10. Look up the cooling degree days for your area. ....

    Look up the cooling degree days for your area. . .
    http://www.degreedays.net/
    for the before- and after- periods. It will help you eliminate unlikely causes.

    The more clues you get and the more...
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    Heat is one cap failure mode due to excessive ESR...

    Heat is one cap failure mode due to excessive ESR but cap makers may not publish their ESR values.

    Voltage stress on the cap dielectric is another which you can probably minimize by using the...
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    This is the Ask Our Pro's forum, and only Pro...

    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise, commentary, or ask questions of the OP here.

    You can find the rules for posting and...
  13. How long to recharge freon in a ten-year-old Toyota?

    Assuming this is the cause of an "inadequate cooling"
    complaint?
    The blower works.

    TIA
  14. Thread: sorry

    by WhoIsThat?
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    sorry

    for breaking the AOP rules.
  15. Replies
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    The AOP forums/Ask Our Pro's forums, are...

    The AOP forums/Ask Our Pro's forums, are restricted to only Pro members that have been vetted by the AOPC can post advise, questions or commentary in a thread created by someone else. You need to...
  16. The AOP forums/Ask Our Pro's forums, are...

    The AOP forums/Ask Our Pro's forums, are restricted to only Pro members that have been vetted by the AOPC can post advise, questions or commentary in a thread created by someone else. You need to...
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    The voltage of the electrical service drops...

    The voltage of the electrical service drops slightly when a heavy load is switched on because the output impedance of the PoCo system is not zero, but it is pretty low. At my house it measures about...
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    Yes. Is this average or exceptional for...

    Yes. Is this average or exceptional for contractors like yourself? It sounds good to me but I don't know what to compare it to.
    If most contractors go 40 years without a single claim this is not...
  19. There are integrated circuits that do frequency...

    There are integrated circuits that do frequency to voltage conversion.
    http://www.alldatasheet.com/datasheet-pdf/pdf/8824/NSC/LM2917N.html
    You need to find one that is boxed up for ease of use.
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    If you have a bike with a speedometer, MPH =...

    If you have a bike with a speedometer, MPH = FPM/88, so 360 FPM = 4.1 MPH. Just don't let anyone see you checking your anemometer using your bike. :D
    ...
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    If half or more of the contractors have claims...

    If half or more of the contractors have claims made at or before the 10 year mark then you are doing better than average, possibly much better than average.
    Is there any way to confirm this? ...
  22. He's trying to put the Burden of Proof on you....

    He's trying to put the Burden of Proof on you.
    I'd first ask him
    What bad thing would have to happen?
    for him to finally follow good HVAC practice.

    There's what can happen.
    There's how...
  23. I think almost anyone would say that the present...

    I think almost anyone would say that the present method that the tech is using is not working.

    For power line problems the Power Companies have recording voltmeters that babysit the power line...
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    If you put them in series then only one of the...

    If you put them in series then only one of the two has to open for the pump to shut off and so this has a higher likelihood of shutting off when it is supposed to and a lower likelihood of turning on...
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    They did meet and they lived happily ever after....

    They did meet and they lived happily ever after. . .:D
  26. Replies
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    Yeah. There was a guy in EC&M who got 120v and...

    Yeah.
    There was a guy in EC&M who got 120v and seemed OK but later developed problems. His expert witness said that the guy might have gotten 500 mA through his body.
    This is 120v/0.5A = 240...
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    Let's say a float switch can only fail by not...

    Let's say a float switch can only fail by not closing or not opening.
    The paralleling of two (or more) switches helps the first problem but makes it at least 2x as likely that the combination will...
  28. Is there no way to modify what he has to make it...

    Is there no way to modify what he has to make it work?

    If no, then say you will do what he says and if it doesn't work he has to pay you $X each time, and $X is a substantial sum to him.
    This...
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    Well, I guess you don't need this book...

    Well, I guess you don't need this book
    http://www.amazon.com/iDisorder-Understanding-Obsession-Technology-Overcoming/dp/0230117570
    :D
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    You need to somehow avoid giving them the...

    You need to somehow avoid giving them the impression that you are desperate. Don't act cocky, just quietly confident.
  31. Replies
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    Don't forget that the time delay electronics has...

    Don't forget that the time delay electronics has to work down to the outside design temp at the location without getting flaky; where I am the ODT is +14F.
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    Keep looking for job opportunities in any case,...

    Keep looking for job opportunities in any case, and I hope you are good at bluffing.

    A desperate employee is a "good" employee and companies want you to be desperate, and in this economy there...
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    Sounds good. The contactor coil is an inductive...

    Sounds good. The contactor coil is an inductive load so make sure this relay doesn't mind switching a low-current inductive load, or that the contactor coil has a spike suppressor/Transorb wired...
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    Concrete is a semiconductor and wet concrete is a...

    Concrete is a semiconductor and wet concrete is a pretty good conductor. See if you can light a 7-1/2W bulb that's hooked up between the hot line and the floor. If that works, try a 100W bulb.
    ...
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    Except this relay only handles a 10A resistive...

    Except this relay only handles a 10A resistive load and at least 35A is necessary, if I understand the hookup correctly.

    With resistive loads there is no startup current surge. They are easier to...
  36. Thread: Motor

    by WhoIsThat?
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    You can also figure it by motor weight or motor...

    You can also figure it by motor weight or motor volume but the link above is probably more accurate than either of these two methods.
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    Not that I know of. You may want to derate the...

    Not that I know of. You may want to derate the contacts for longer life or higher reliability.

    General search...
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    Because 20 tons at 230v/1 ph probably needs to...

    Because 20 tons at 230v/1 ph probably needs to draw 200A?
  39. Thread: #10 fuse?

    by WhoIsThat?
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    The HO might actually get away with this, if. . ....

    The HO might actually get away with this, if. . .
    -there's a line to line short and so the real fuse blows
    -the equipment eventually dies without ever shorting
    -there's a line to neutral short on...
  40. Thread: #10 fuse?

    by WhoIsThat?
    Replies
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    2,319

    For #8 or larger wire??? :whistle:

    For #8 or larger wire??? :whistle:
  41. So even if the HO thinks he got away with having...

    So even if the HO thinks he got away with having only one guy come for two separate issues, he may not have.

    BTW, what issues do new units have? I'd think there would at least be a honeymoon...
  42. Yes, the advantage to the HO is only one service...

    Yes, the advantage to the HO is only one service call. What are all the disadvantages to the HO of sending an HVAC for a plumbing job and vice versa if the person sent does not want to admit that...
  43. Just for my own education, what are all the...

    Just for my own education, what are all the disadvantages to the HO of sending an HVAC for a plumbing job and vice versa?

    We're assuming that no one wants to admit that a job is over their head...
  44. What must he believe for him to hire a plumber? ...

    What must he believe for him to hire a plumber?

    He wants to save some money but he doesn't yet know the downside?
    He wants to save some money and he doesn't care about any downsides?
    He is...
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    Thanks, folks. . .

    Thanks, folks. . .
  46. Replies
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    Transporting an upright freezer

    Lay it over, transport it, and then wait 24 hours in the upright position to power it? OK?

    This issue seems to be controversial.
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    Have I ever written a post you approved of?

    Have I ever written a post you approved of?
  48. Replies
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    no burn ever at 42C(108F) burned in 30 sec at...

    no burn ever at 42C(108F)
    burned in 30 sec at 54C(129F)
    5 sec at 60C(140F)
    1 sec at 71C(160F)

    I'd think mild overload; confirm by having the tech check that the output voltage is...
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    Questions: Statements by bystanders: ...

    Questions:



    Statements by bystanders:



    My answers to both questions and statements:
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    If you just need the endpoints, 4.00 mA and 20.00...

    If you just need the endpoints, 4.00 mA and 20.00 mA and 0v and 10.00v, it's easier. Would you also need midpoints [12.00 mA and 5.00 v]?

    You want to go that way?
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