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  1. Replies
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    4,098

    Problem solved! We just started working on this...

    Problem solved!
    We just started working on this facility this month.

    We replaced the 1967 circuit setter with a modern B&G circuit setter.
    I was then able to measure the amount of water flowing...
  2. Replies
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    4,098

    the coils are stacked one on top the other, the...

    the coils are stacked one on top the other, the piping does make it look like the top one is out in front, but it isnt. Each supply line goes to a separate coil. I just started working on this...
  3. Replies
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    3,789

    Static Pressure (Sp) This is pressure that is...

    Static Pressure (Sp) This is pressure that is exerted in all directions of a duct. When static pressure = total pressure there would be no flow.

    Velocity Pressure (Vp) The difference between...
  4. Replies
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    4,098

    no, according to the teachers, it has been hot...

    no, according to the teachers, it has been hot for 10 years
  5. Replies
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    4,098

    today i valved off the water and opened up the AB...

    today i valved off the water and opened up the AB side of the 3-way valve.
    I watched the internal piston/plunger stroke all the way up then all the way down. It fully seated in both directions.
    ...
  6. Replies
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    4,098

    Lic to chill i measured the r/a temp at the...

    Lic to chill
    i measured the r/a temp at the mixing box before the chw coil,
    the outside air dampers have been disconnected by someone else.

    maxster
    its not glycol, the actuator is 100% fully...
  7. Replies
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    4,098

    chill water AHU, not cooling properly

    43932
    43942

    43952 43962 43972 43982




    Ok, AHU 1
    York M: CS402SVMP D AHU-1
  8. Replies
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    10,529

    80 + 15 = 95 220 + 15 = 235 235/95=2.47 2.5 to...

    80 + 15 = 95
    220 + 15 = 235
    235/95=2.47
    2.5 to 1 compression ratio
  9. Replies
    19
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    2,449

    Where did you here that a pitot tube can be off...

    Where did you here that a pitot tube can be off +/- 20%????
  10. Replies
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    13,487

    http://members.cox.net/epittman2/hvac-talk/sheetme...

    http://members.cox.net/epittman2/hvac-talk/sheetmetal%20cost-weight.jpg

    how is this???

    jwp
  11. Replies
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    3,132

    http://i159.photobucket.com/albums/t127/joeywpittm...

    http://i159.photobucket.com/albums/t127/joeywpittman/shaft%20seal/026_26_0001.jpg



    check out the photo album
    link on the link
    ...
  12. Replies
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    1,107

    too low

    too low
  13. Replies
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    1,283

    what is the ambient temp. when this happens???

    what is the ambient temp. when this happens???
  14. Replies
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    1,283

    no subcooling?? A)is that assumed because...

    no subcooling??

    A)is that assumed because there was a flashing sight glass.
    or
    B) the sat. temp. minus LL temp. = 0*
  15. Replies
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    5,295

    http://members.cox.net/epittman2/hvac-talk/part%20...

    http://members.cox.net/epittman2/hvac-talk/part%20winding%20start.JPG
  16. Replies
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    7,869

    home depot ownes trane

    home depot ownes trane
  17. Replies
    18
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    2,399

    ?1 77* loop is that temp the supply or return ...

    ?1 77* loop is that temp the supply or return

    ?2 how did you verify 12 gpm

    ?3 what is the chances of the original charge having air in it. was the original charge put back in



    [Edited...
  18. Replies
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    831

    what brand and model compressor are you referring...

    what brand and model compressor are you referring to??
  19. Replies
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    912

    there are two basic types of compressors:...

    there are two basic types of compressors: positive-displacement and dynamic.

    Positive-displacement compressors increase refrigerant vapor pressure by reducing the volume of the compression...
  20. Replies
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    831

    the compressor's oil pump has to build up oil...

    the compressor's oil pump has to build up oil pressure before the oil can be used to hydraulicly activate the unloader assemble.

    if the compressor is not running there is no net oil pressure.
    ...
  21. Replies
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    2,399

    http://members.cox.net/epittman2/hvac-talk/FHP%20E...

    http://members.cox.net/epittman2/hvac-talk/FHP%20EM048.JPG
  22. Replies
    7
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    1,144

    send off for an oil analysis

    send off for an oil analysis
  23. Replies
    6
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    1,301

    what are white papers?

    what are white papers?
  24. try (20) 50-gallon drums

    try (20) 50-gallon drums
  25. Replies
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    4,120

    Trane Voyager restricted orifices

    Trane Voyager restricted orifices
    M#YCD180B3L0EA
    S#M451022097D

    has any one found an easy way to clean out the restricted orifices without installing a new orfice tube kit or and without...
  26. Replies
    8
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    2,510

    alot of times there isn't a...

    alot of times there isn't a water-regulating-valve
    in these units.

    a circuit setter is installed to set the proper GPMs for that unit
  27. Thread: PTAC

    by joeywpittman
    Replies
    7
    Views
    886

    what is a VX??

    what is a VX??
  28. Replies
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    1,446

    buy a little yellow jacket hand oil pump...

    buy a little yellow jacket hand oil pump
    http://i10.ebayimg.com/02/i/08/52/0c/46_2.JPG

    [Edited by joeywpittman on 09-21-2006 at 05:39 PM]
  29. In regard to multi-stage centrifugal compressors...

    In regard to multi-stage centrifugal compressors it can be said that each stage?

    d-has a smaller volume

    i interpretted "volume" as the amount of refrigerant inside each impeller wheel
    verse...
  30. http://members.cox.net/epittman2/hvac-talk/multist...

    http://members.cox.net/epittman2/hvac-talk/multistage%20centrifugal.jpg
  31. e. none of the above what weights more a pound...

    e. none of the above

    what weights more a pound of feathers or a pound of bricks??
  32. Replies
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    1,025

    try this file...

    try this file
    http://members.cox.net/epittman2/hvac-talk/ca-sb-19-d-65-28.pdf
  33. Replies
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    8,773

    is there a recall from trane??? will trane pay...

    is there a recall from trane???
    will trane pay for the txvs???
  34. Replies
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    2,410

    deleted

    deleted
  35. Thread: 19 XR

    by joeywpittman
    Replies
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    4,548

    i'll sell you the "impeller spacing" for a dollar...

    i'll sell you the "impeller spacing" for a dollar

    http://members.cox.net/epittman2/hvac-talk/19xr%20impeller%20spacing.pdf

    i accept "IOU" or "thank you"
  36. read the opening paragraph on chapter 3. "design...

    read the opening paragraph on chapter 3.
    "design criteria"
  37. Replies
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    2,175

    I agree with joebear York Condensers are known...

    I agree with joebear

    York Condensers are known for having this problem.
    Change the fan cycle controller from the temp. switch to a nice adjustable pressure controller. This will solve your...
  38. Replies
    5
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    1,126

    quote orland25 "Everytime I change the oil" ...

    quote orland25 "Everytime I change the oil"

    Question: why are you changing the oil

    you could do an oil analysis to get your answers, but it wont tell you anything if you just replaced the oil....
  39. Replies
    5
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    782

    you forgot a 0 350 k

    you forgot a 0
    350 k
  40. Replies
    5
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    1,842

    whats the model and serial number???

    whats the model and serial number???
  41. Replies
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    4,643

    HVAC3901 i'm trying to be more polite when...

    HVAC3901

    i'm trying to be more polite when responding on this forum.
    just in case i'm wrong (40% of the time)
    i wrote "i maybe mistaken"



    [Edited by joeywpittman on 04-04-2006 at 08:23 PM]
  42. Replies
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    4,643

    who cares Did you read AM-CON18???? it has all...

    who cares
    Did you read AM-CON18????
    it has all the information you could ever dream about reguarding Trane's w7900 controller


    [Edited by joeywpittman on 04-04-2006 at 07:42 PM]
  43. Replies
    29
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    4,643

    hvac3901 i maybe mistaken but on a 1988 CGAC...

    hvac3901
    i maybe mistaken but on a 1988 CGAC trane using a W7900 controller the third knob controls the number of stages

    verses

    on a w7100 controller the number of stages is controlled by a...
  44. Replies
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    2,383

    Thats a dang good idea!!

    Thats a dang good idea!!
  45. Replies
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    4,643

    who cares Is the controller a W7900 or a W7100???

    who cares
    Is the controller a W7900 or a W7100???
  46. Replies
    29
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    4,643

    The resistor is for setting the (LTC) low...

    The resistor is for setting the (LTC) low temperature cutout. If there is no resistor in place the controller defaults to 35*F
  47. Replies
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    4,643

    Honeywell w7000 and w7901 Control Checkout...

    Honeywell w7000 and w7901 Control Checkout Procedures
    http://members.cox.net/epittman2/hvac-talk/CGWC-SB-2A.pdf

    AM-CON18 <-- Trane's Literature Number
    23 pages of how the w7900 controller works...
  48. Replies
    9
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    1,163

    Does the compressor have any type of unloading...

    Does the compressor have any type of unloading capabilities?

    Are there any solenoid valves installed in the liquid lines
    of the evaporator circuits?
  49. Replies
    33
    Views
    2,857

    I agree you could move more cfms by increasing...

    I agree you could move more cfms by increasing the rpms
    BUT take this hypothetical situation for an example.

    On a 1000 ton system with standard design conditions.
    If we wanted to use R-123 with...
  50. Replies
    33
    Views
    2,857

    Back to the question at hand. Typically the...

    Back to the question at hand.
    Typically the bigger the wheel the more cfms it will move.

    Lower pressure refrigerants require much larger compressor suction flow rates. (cfm/ton)

    i.e. a bigger...
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