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  1. Replies
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    Fluke 116

    Fluke 116
  2. Replies
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    Start with the wiring diagram & schematic. ...

    Start with the wiring diagram & schematic. Determine what you want to measure. Know ahead of the measurement what "good" and "bad" readings are. Think about the sequence of operation.

    Why...
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    X2. Leaving the sensing bulb like that is...

    X2. Leaving the sensing bulb like that is inexcusable. And no LL filter/drier? Really?
  4. I believe the common for the capacitor connects...

    I believe the common for the capacitor connects to one leg of the 240 V contactor output (say, L1), which is where the motor *run* winding also connects.

    The "common" terminal on the motor...
  5. If you understand how one motor works, you...

    If you understand how one motor works, you understand how two motors work.

    Draw two separate circuits, one for the compressor motor, and one for the condenser fan motor.

    Notice how they're...
  6. Because in actuality it is one leg of the 240...

    Because in actuality it is one leg of the 240 volt circuit.
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    If you really understood what SH & SC are, I...

    If you really understood what SH & SC are, I don't think you'd be asking the question this way. What do the charts say?
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    If you've got the textbook, then you've probably...

    If you've got the textbook, then you've probably got all the information your teacher's gonna give you in class next year. Read ahead. Think about what you're seeing, and about what the purpose of...
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    Had one like this a month ago. When I pulled the...

    Had one like this a month ago. When I pulled the coil to look at supply plenum, found about 3" of hot water in it. Turned out there was a leak in the hot water supply line (HWT is right next to...
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    4,190

    One of the best books I can recommend is an older...

    One of the best books I can recommend is an older copy of "Trane Air Conditioning Manual". I'm talking like the 1950s versions. They're written much, much better than more modern stuff, and cover...
  11. Trane/AS 950 Comfort Control - "Raptor algorithms" ???

    I'm reading the Technical Service Manual for the 950 Control trying to learn more about how it does its thing. In it, there is a reference to the use of "Raptor algorithms".

    What are Raptor...
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    High suction could be caused by high heat load on...

    High suction could be caused by high heat load on the evap. What is the air temperature entering the coil?
  13. Replies
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    695

    Ditto. No DIY here.

    Ditto. No DIY here.
  14. Replies
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    6,158

    Does China even have a minimum wage?

    Does China even have a minimum wage?
  15. Replies
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    I'll try it next time. Always looking for a...

    I'll try it next time. Always looking for a better way.
  16. Replies
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    I went on one a couple of weeks ago where the...

    I went on one a couple of weeks ago where the lady had called one of these companies (their TV pitchman is a former local college football QB) and they told her she needed to replace her system. ...
  17. Replies
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    2,117

    I never thought about cleaning a blower wheel...

    I never thought about cleaning a blower wheel without taking the blower housing out & taking the motor off. I use a toothbrush & shop vac. It's a nasty job.
  18. Replies
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    Not to be picky, but the 12 degrees of superheat...

    Not to be picky, but the 12 degrees of superheat is not picked up during evaporation - latent heat is picked up during evaporation.

    Then after complete evaporation, more heat (superheat) is...
  19. Replies
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    1,234

    The bulletin, disappointingly, had nothing to say...

    The bulletin, disappointingly, had nothing to say about *why* mismatches cause premature compressor failure. I don't question that it's true, necessarily, its just something I'm trying to understand.
  20. Replies
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    Voltage doesn't "go in" or "come out", as I know...

    Voltage doesn't "go in" or "come out", as I know you know. It's measured between two points in the circuit.
  21. Replies
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    Can you post a better copy of the bulletin? I'd...

    Can you post a better copy of the bulletin? I'd like to read it.
  22. Replies
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    X2. The wiring / schematic diagram is your best...

    X2. The wiring / schematic diagram is your best friend. Use it.

    The sum of the voltage drops around the load side of the circuit will equal the supply voltage. Use your meter to find the one...
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    X2

    X2
  24. Replies
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    Sent it back to Testo & they fixed it.

    Sent it back to Testo & they fixed it.
  25. I really need to learn how to weld...

    I really need to learn how to weld...
  26. Where did you buy the angle iron stand (or did...

    Where did you buy the angle iron stand (or did you make it)?
  27. You mean before setting the curb? That stuff is...

    You mean before setting the curb? That stuff is pretty well embedded in the tar...?
  28. Second link says photo's no longer there. I'd...

    Second link says photo's no longer there. I'd really like to see this, as I have the same situation next week. Setting a 3 ton American Standard on a tar & gravel flat roof.
  29. Thanks rundawg & mark. I was astounded they had...

    Thanks rundawg & mark. I was astounded they had 3-1/2 tons in an 1150 sq. ft. house. But then I discovered they had floor returns up through the walls & across to a pan duct made of ceiling wall...
  30. Help reading old GE/TRANE model & serial numbers

    One of the old "cube" type condensers by GE / TRANE:

    Model # BGTA742B1A01
    Serial # 201948301

    Is this a 3-1/2 ton unit made in 1st week of 1983?

    House was built in 1964, 1150 sq. ft.
  31. Thread: Bathroom scale

    by bobster
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    X2

    X2
  32. Replies
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    Expectations are premeditated resentments...

    Expectations are premeditated resentments :whistle:
  33. Replies
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    I don't look at the maximum return velocity as a...

    I don't look at the maximum return velocity as a (primary) design value. I look at it as a value not to be exceeded due to noise considerations. The primary focus is on static pressure drop.
    ...
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    After thinking about it some more, it seems to me...

    After thinking about it some more, it seems to me that I would need to create a wall construction which added the U values for the garage - interior wall to the U value for the exterior garage door...
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    447

    Manual J question

    I'm trying to get better at doing Man Js, so I'm practicing on my house. I have an attached, unconditioned 2 car garage. How should the walls between the garage and the interior of the house be...
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    X2...

    X2...
  37. Replies
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    Does the compressor & outdoor fan turn on with a...

    Does the compressor & outdoor fan turn on with a call for heat?
  38. It's OK to replace with a tighter tolerance ...

    It's OK to replace with a tighter tolerance (i.e., motor came with +/- 10%, replace with +/- 5%), but not a larger one than what was originally specified by the designer for the motor. The designer...
  39. Yes, that's what I said - at full rated load.

    Yes, that's what I said - at full rated load.
  40. The article is entitled "Design of Capacitor...

    The article is entitled "Design of Capacitor Motors for Balanced Operation" by P.H. Trickey. I don't have a link. I found it on the IEEE archives, and paid $10.00 to download a copy. You might try...
  41. The capacitor's value is selected based on the...

    The capacitor's value is selected based on the parameters of the motor windings. The objective is to shift the phase of the auxiliary winding's *current* (not voltage) by 90 degrees relative to the...
  42. Replies
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    They still make them! And they're pretty...

    They still make them! And they're pretty pricey...

    - - - Updated - - -

    Fluke 116 works great for me.
  43. Replies
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    To get all the paint out of the system...:whistle:

    To get all the paint out of the system...:whistle:
  44. I'm glad I'm not the only one who's done this. ...

    I'm glad I'm not the only one who's done this. Found mine on my flashlight magnet, might want to check there...
  45. Replies
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    There should be a wiring & schematic diagram in...

    There should be a wiring & schematic diagram in the Installer's guide. There should also be one somewhere on the furnace / air handler unit. Like on the back of one of the cover panels. It'll tell...
  46. Replies
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    Or you could look at the wiring diagram (in the...

    Or you could look at the wiring diagram (in the Installer's guide) to determine what B is for...
  47. Replies
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    1,273

    I've not worked with a NEST, but I've seen...

    I've not worked with a NEST, but I've seen similar comments from a lot of guys on this site. Help me understand the problem with NEST...(I have a couple of customers who love it)
  48. Replies
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    What is manufactured gas?

    What is manufactured gas?
  49. Replies
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    Did you look to see where the other end of the...

    Did you look to see where the other end of the blue wire is connected?
  50. "Trust, but verify..." - Ronald Reagan :whistle:

    "Trust, but verify..." - Ronald Reagan :whistle:
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