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  1. Thread: Duct Cleaning

    by ehsx
    Replies
    9
    Views
    190

    Direct contact cleaning on metal ducts may be...

    Direct contact cleaning on metal ducts may be beneficial.
    Otherwise limited improvements or potential damages. Last time I checked there were no approved encapsulants.
  2. Replies
    6
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    135

    Commercial ac has far less late night and weekend...

    Commercial ac has far less late night and weekend calls than refrigeration. Little or no difference in pay. Usually cleaner work & easier.
  3. Replies
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    334

    Service history?

    Service history?
  4. Replies
    6
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    225

    Buy a detec or h-10. Only two Iíve found...

    Buy a detec or h-10. Only two Iíve found reliable or accurate enough
  5. [QUOTE=VTP99;25988228]What's the difference...

    [QUOTE=VTP99;25988228]What's the difference between operating & shipping ?[/QUOTe
    Shipping includes crating, operating include water in tower.
  6. No excuse with new equipment. Had an old bac,...

    No excuse with new equipment. Had an old bac, rust & scale probably as heavy as the tower. Crane tilted and tower sides collapsed, but no other damages other than underwear.
  7. Thread: Exam question

    by ehsx
    Replies
    2
    Views
    417

    TABLE 403.3.1.1 MINIMUM VENTILATION RATES J. ...

    TABLE 403.3.1.1
    MINIMUM VENTILATION RATES

    J. If the tenants of the dwelling have exclusive use of the garage below, no exhaust is required.

    100 cfm per car if multiple tenants
  8. Replies
    34
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    967

    What's wrong with a mixing tank? You need to...

    What's wrong with a mixing tank?
    You need to look at the controls sequence.
  9. Replies
    34
    Views
    967

    ????? using 44* water to make 42*f water?

    ?????
    using 44* water to make 42*f water?
  10. Replies
    6
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    542

    Wolverine used to have cross reference numbers...

    Wolverine used to have cross reference numbers for old York chiller tubes, they went bankrupt and recently reopened but not doing chiller tubes .
    Typically need equipment order specs since a...
  11. Replies
    146
    Views
    74,181

    Good if heat exchangers have glycol or are...

    Good if heat exchangers have glycol or are drained. Butterfly and check valves should not be trusted. Larger valves have more leak potential. Always evaluate worst case potentials. Saving a few...
  12. Thread: Share Your Story

    by ehsx
    Replies
    147
    Views
    4,227

    Thats what i call a survivalist!

    Thats what i call a survivalist!
  13. sent

    sent
  14. Replies
    146
    Views
    74,181

    So long as you have isolation valves that hold. ...

    So long as you have isolation valves that hold. Always skeptical about leaving unattended charge in condenser or evap. Seen a few chillers freeze up if water left in heat exchangers.
  15. There are three manuals, 050, 063/087, 100/126. ...

    There are three manuals, 050, 063/087, 100/126.
    Which is needed?
  16. Evaporator approach?

    Evaporator approach?
  17. Replies
    64
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    2,691

    Would love to see the piping drawing for that...

    Would love to see the piping drawing for that system. Most of issues that Iíve seen required adjusting the charge as seasons changed.
  18. Replies
    64
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    2,691

    If you have a receiver you must maintain a liquid...

    If you have a receiver you must maintain a liquid seal to the expansion valve be either using elevation, pressurized control, or suction/liquid line heat exchangers. Seen a number of r22 systems...
  19. Replies
    23
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    858

    Lots of free power points online. Danfoss ,...

    Lots of free power points online.
    Danfoss , emerson/copeland has a couple of dozen shorts ,some with quiz's.
    email me and Iíll send a few Items next week.
  20. Replies
    64
    Views
    2,691

    Under all loads there must be adequate subcooling...

    Under all loads there must be adequate subcooling at the expansion valve to feed without flashing before the valve seat, ~2-4*f sc. subcooling drops as you unload, line and components cause sc loss,...
  21. Replies
    68
    Views
    2,578

    Stranded and twisted groups give better...

    Stranded and twisted groups give better flexibility , what has not been addressed is how twisted groups reduce induction.

    Mfgís have changed to twisted or shielded, added movs or other...
  22. Replies
    55
    Views
    1,551

    Guess you have never seen a mollier diagram. Or...

    Guess you have never seen a mollier diagram. Or does science not apply in your world?

    Iím done with your non- sense.
  23. Replies
    55
    Views
    1,551

    General info, listed water cooled & air cooled

    General info, listed water cooled & air cooled
  24. Replies
    55
    Views
    1,551

    Trane is the only company that Iím aware of that...

    Trane is the only company that Iím aware of that balances a wheel on the compressor. The term would indicate a different procedure in most cases. I had asked earlier that you clarify the procedure,...
  25. Replies
    55
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    1,551

    York used to test run closed systems with ďdryĒ...

    York used to test run closed systems with ďdryĒ air. Combination of pressure and temp caused combustion of oil and chiller exploded killing the testers. That was when ashrae changed the policy on...
  26. Replies
    55
    Views
    1,551

    See ashrae 15- 1994. Air shall not be used for...

    See ashrae 15- 1994. Air shall not be used for pressure testing or run test.

    Air run implies running a machine using air. Used to be a common test procedure on older equipment. Running a...
  27. Replies
    55
    Views
    1,551

    List the complete procedure for discharge gas for...

    List the complete procedure for discharge gas for air run. Canít recirculate was what i was referring to. Hot air from compressor air run blew up at York and same has happened at allis chambers.
  28. Replies
    55
    Views
    1,551

    Run with air and risk combustion. Probably...

    Run with air and risk combustion.
    Probably been working on centrifugal before you was born.
  29. Replies
    55
    Views
    1,551

    Clarify ďair runĒ. Air run is illegal since 90ís...

    Clarify ďair runĒ. Air run is illegal since 90ís accident at York that killed a few. Nitrogen ok.
  30. Replies
    16
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    733

    Ceramic or oil filled. Nothing with red hot...

    Ceramic or oil filled. Nothing with red hot elements or anything hot enough to catch a paper towel on fire.
  31. Replies
    55
    Views
    1,551

    Best to start with 80-90% of name plate and trim...

    Best to start with 80-90% of name plate and trim based on full log sheet and design data. Mfg literature or as sold design info as reference.
  32. Replies
    55
    Views
    1,551

    Assuming full load design conditions, charge by...

    Assuming full load design conditions, charge by subcooling. Verify ssh, dsh sh, evap approach, liquid line approach, & condenser approach.

    Subcooling will drop as load decreases.
    Ssh with txv...
  33. Thread: The fuse of shame

    by ehsx
    Replies
    33
    Views
    2,340

    Use gum wrappers for < 2 amps...

    Use gum wrappers for < 2 amps...
  34. Thread: The fuse of shame

    by ehsx
    Replies
    33
    Views
    2,340

    That's better than the "Darwin Award winner" who...

    That's better than the "Darwin Award winner" who used a 22 rimfire in a truck fuse holder, shot his self in his pride, ran into a canal and drowned....


    Tech told me once he knew how may strands...
  35. Replies
    20
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    1,373

    Just a fyi. Electronic air cleaners can create...

    Just a fyi. Electronic air cleaners can create ozone & odors when connected directly to a tight 90 due to extreme flow variations.
    Air flow needs to be fairly even across the elements. Couldn't...
  36. Replies
    15
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    1,470

    Yea, but they are made in China and doesnít...

    Yea, but they are made in China and doesnít affect global warming!
  37. New or existing older job? How much of the...

    New or existing older job?
    How much of the condenser water piping is higher than the tower basin? Type tower, model? Iso?
  38. Smacna has good manuals

    Smacna has good manuals
  39. Replies
    4
    Views
    859

    Line reactor is listed as an accessory. Do you...

    Line reactor is listed as an accessory. Do you have it?

    Line reactor:
    Increased reliability and life span of the VFD
    Provide some protection against over-voltage trips
    A cost-effective...
  40. Replies
    22
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    589

    Being near so many oil and chemical refineries...

    Being near so many oil and chemical refineries check with some of the construction and maintenance companies also. They typically will have hvac service techs plus call in outside help where you may...
  41. Replies
    4
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    700

    Never heard of aluminum out gassing? Heat...

    Never heard of aluminum out gassing? Heat pump? Model?

    I had a new rooftop Carrier installation that smelled like sewer gas. Third trip there I found the roofers broken the sewer vent pipe low...
  42. Thread: compressor H.P

    by ehsx
    Replies
    14
    Views
    998

    Chill water: Once you get into design build,...

    Chill water: Once you get into design build, motors maybe oversized as much as 50% to get best full load efficiency, closer to nominal gives better part load.
    To get hp/fla you have to request...
  43. Replies
    63
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    2,084

    Some techs like the digital gauges because some...

    Some techs like the digital gauges because some give a digital log. I don't like the printout because 30-50% of the info needed for through analysis on a log sheet is missing.

    No expendables, no...
  44. Replies
    2
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    843

    Don Derfler, Westinghouse/McQuay/Daikin

    Don passed away last week due to Covid. He was 75 years old, retired about 4 years ago from chiller training position at Daikin, Staunton VA. He started with Westinghouse after leaving the Navy,...
  45. Replies
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    1,817

    "Any opinions about this "BAD ASS HVAC" video?" ...

    "Any opinions about this "BAD ASS HVAC" video?"

    .
  46. Replies
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    1,817

    Not upsetting me, just showing your lack of...

    Not upsetting me, just showing your lack of professionalism. If this is your way of having fun I feel sorry for your customers and "guild" members.
  47. Replies
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    1,817

    "Guys, my Tesla went up $250k on Friday alone. A...

    "Guys, my Tesla went up $250k on Friday alone. A year ago that amount of money was mind boggling to me. My year has been insane not just in bad ways.
    So no, IDGAF about making any wrinkles, or...
  48. Thread: R114 replacement

    by ehsx
    Replies
    14
    Views
    4,396

    R134a pressures much higher, check asme vessel...

    R134a pressures much higher, check asme vessel ratings.
  49. Replies
    23
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    1,128

    I just see it as commitment. Parables can mean...

    I just see it as commitment. Parables can mean different things ... all Iíve expected is honesty, leave if you like.
  50. Replies
    23
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    1,128

    These discussions remind me of the vineyard...

    These discussions remind me of the vineyard workers parable, Matthew 20:1-16

    Donít expect more than originally agreed, Do what you agreed and are paid to do. Change jobs if not satisfied,...
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