Search:

Type: Posts; User: bobster

Page 1 of 10 1 2 3 4

Search: Search took 0.01 seconds.

  1. Replies
    5
    Views
    319

    It was about 90 the other day, and the system...

    It was about 90 the other day, and the system wouldn't pull down below 77. He wanted 72. I had already cleaned the condenser coils when I was there the first time, but the outside temp was only 64,...
  2. Replies
    5
    Views
    319

    Thanks, rundawg, for both the "what" and the...

    Thanks, rundawg, for both the "what" and the "why" answer!
  3. Thread: TXV flow rate

    by bobster
    Replies
    14
    Views
    3,166

    Amen, jp! The ability to think is becoming...

    Amen, jp! The ability to think is becoming scarcer & scarcer...
  4. Replies
    5
    Views
    319

    TXV Theoretical Question

    Suppose I have a 20 year old Goodman 2.5 ton R-22 (CLJ30-1A) condenser on which someone has installed a 4 year old American Standard 3 ton evaporator coil with a TXV (4TXCB036BC3HAA).

    Since the...
  5. Replies
    14
    Views
    3,896

    My brand new out of the package YJ 69086 wouldn't...

    My brand new out of the package YJ 69086 wouldn't register anything but >25000 microns. I could wiggle on the connector between the sensor and the electronics, and it would show readings which...
  6. Replies
    40
    Views
    4,041

    Fluke 116

    Fluke 116
  7. Replies
    16
    Views
    1,173

    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...
  8. Replies
    181
    Views
    14,010

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

    X2. Leaving the sensing bulb like that is inexcusable. And no LL filter/drier? Really?
  9. 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...
  10. 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...
  11. Because in actuality it is one leg of the 240...

    Because in actuality it is one leg of the 240 volt circuit.
  12. Replies
    15
    Views
    1,250

    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?
  13. Replies
    39
    Views
    2,724

    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...
  14. Replies
    21
    Views
    1,461

    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...
  15. Replies
    15
    Views
    4,711

    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...
  16. 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...
  17. Replies
    35
    Views
    1,879

    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?
  18. Replies
    13
    Views
    971

    Ditto. No DIY here.

    Ditto. No DIY here.
  19. Replies
    49
    Views
    7,192

    Does China even have a minimum wage?

    Does China even have a minimum wage?
  20. Replies
    38
    Views
    2,965

    I'll try it next time. Always looking for a...

    I'll try it next time. Always looking for a better way.
  21. Replies
    49
    Views
    7,192

    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. ...
  22. Replies
    38
    Views
    2,965

    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.
  23. Replies
    14
    Views
    1,622

    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...
  24. Replies
    18
    Views
    1,736

    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.
  25. Replies
    23
    Views
    2,014

    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.
  26. Replies
    18
    Views
    1,736

    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.
  27. Replies
    23
    Views
    2,014

    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...
  28. Replies
    168
    Views
    11,873

    X2

    X2
  29. Replies
    15
    Views
    3,566

    Sent it back to Testo & they fixed it.

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

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

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

    You mean before setting the curb? That stuff is pretty well embedded in the tar...?
  33. 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.
  34. 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...
  35. 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.
  36. Thread: Bathroom scale

    by bobster
    Replies
    66
    Views
    5,700

    X2

    X2
  37. Replies
    16
    Views
    2,037

    Expectations are premeditated resentments...

    Expectations are premeditated resentments :whistle:
  38. Replies
    4
    Views
    876

    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.
    ...
  39. Replies
    3
    Views
    607

    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...
  40. Replies
    3
    Views
    607

    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...
  41. Replies
    75
    Views
    5,141

    X2...

    X2...
  42. Replies
    5
    Views
    610

    Does the compressor & outdoor fan turn on with a...

    Does the compressor & outdoor fan turn on with a call for heat?
  43. 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...
  44. Yes, that's what I said - at full rated load.

    Yes, that's what I said - at full rated load.
  45. 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...
  46. 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...
  47. Replies
    49
    Views
    4,207

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

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

    - - - Updated - - -

    Fluke 116 works great for me.
  48. Replies
    95
    Views
    7,497

    To get all the paint out of the system...:whistle:

    To get all the paint out of the system...:whistle:
  49. 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...
  50. Replies
    19
    Views
    1,831

    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...
Results 1 to 50 of 458
Page 1 of 10 1 2 3 4

Related Forums

Plumbing Talks | Contractor MagazineThe place where Electrical professionals meet.
Quality Home Comfort Awards