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  1. Replies
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    No mfg that Iím aware of will recommend it and...

    No mfg that Iím aware of will recommend it and most say any additives not used by the mfg will void warranty.

    Who much is used? How many times? How compatible with internal components, oil & ref?...
  2. Thread: maitnenace of AHU

    by ehsx
    Replies
    10
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    368

    Dilute per instructions, once clean throughly...

    Dilute per instructions, once clean throughly rinse with a mild detergent, then with plane water. Problems occur when not properly used.
    Then maintain with self rinsing cleaner.

    Alkaline will...
  3. Replies
    19
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    630

    Did you evacuate the unit? Air will give a false...

    Did you evacuate the unit? Air will give a false sc. Test for non-condensables.
    Trim charge to ~15*f sc.
  4. Replies
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    475

    In the pic hard to tell if crimp or loose screw....

    In the pic hard to tell if crimp or loose screw.
    Looks like something missing....
  5. Replies
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    765

    Iíve had rolled flanges (over torqued raised...

    Iíve had rolled flanges (over torqued raised face) and shaft seals leak under vacuum and not show under pressure on chillers.
  6. Thread: Best install yet

    by ehsx
    Replies
    54
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    1,919

    You lose subcooling by: ll pd, ll high ambient...

    You lose subcooling by: ll pd, ll high ambient exposure, static elevation .
    Line sizing and insulation help the first two. Only way to compensate for elevation is add subcooling.
  7. Replies
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    386

    What he said & check for short cycling & adequate...

    What he said & check for short cycling & adequate discharge sh.
  8. Replies
    8
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    386

    Excess oil or water. Acid test oil. Extreme...

    Excess oil or water. Acid test oil.
    Extreme excess oil will cause low discharge sh, lp, and high evao approach
  9. Replies
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    369

    Low differential pressures will cause the evap to...

    Low differential pressures will cause the evap to starve, reduces evap capacity, lower suction pressures, higher compressor amps. High differential pressures risk floodback. Listed efficiency is...
  10. Always exceptions, having a license does enable a...

    Always exceptions, having a license does enable a crook to solicit and advertise for more business and it can take months or years to weed out.

    But a lack of respect for laws usually has...
  11. Replies
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    765

    How about a pressure test with an electronic leak...

    How about a pressure test with an electronic leak detector?
  12. Thread: Best install yet

    by ehsx
    Replies
    54
    Views
    1,919

    If you used compressors like the Tecum... sf,...

    If you used compressors like the Tecum... sf, discharge cooled motors, even the slightest floodback or flooded start would kill em. Anytime the evap was high an inverted trap to the coil height was...
  13. What part of illegal do you not understand?

    What part of illegal do you not understand?
  14. A little hypocrisy here. Some people loved Jessy...

    A little hypocrisy here. Some people loved Jessy James. Licenses and inspections are for consumer protection to insure MINUMIM safety standards. Most consumers have no clue of legal requirements...
  15. Replies
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    831

    Increases heat, reduces voltage, increases amps....

    Increases heat, reduces voltage, increases amps.

    Decrease amps only if it was your design load.
  16. Thread: Best install yet

    by ehsx
    Replies
    54
    Views
    1,919

    Been a while since doing any duct designs, but no...

    Been a while since doing any duct designs, but no take-offs in first x' of discharge plenum ?
  17. Replies
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    831

    Wiring or contactor. Had a call once from a...

    Wiring or contactor.

    Had a call once from a Mr. Trip, he said he had to keep flipping his tripper. I'm thinking "does your wife know about this?". Finally 10 minutes later in the conversation...
  18. Thread: 5$ bet

    by ehsx
    Replies
    5
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    890

    Need to change out the duct xtion?

    Need to change out the duct xtion?
  19. Guess what? People who thump their noses at laws...

    Guess what? People who thump their noses at laws and regulations will also lie to, steal from , & cheat their customers. Also usually less training and more incompetent .
  20. Replies
    19
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    765

    Is it possible to blow up a tire and then have it...

    Is it possible to blow up a tire and then have it go flat shortly? Either way pressure equalizes.
  21. Replies
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    902

    Found my grandmother's recipe for molasses cakes....

    Found my grandmother's recipe for molasses cakes.
    824575
    824576
  22. Thread: Can' t fix stupid

    by ehsx
    Replies
    21
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    859

    I used to carry shovel, rake, hedge clippers &...

    I used to carry shovel, rake, hedge clippers & pressure washer. Keep em clean and clear.
  23. Replies
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    902

    Oatmeal rasin.

    Oatmeal rasin.
  24. Regularly see active jail sentences in North...

    Regularly see active jail sentences in North Carolina for incompetence & working without a license. Usually after multiple citations & no response.
  25. Replies
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    1,099

    Hfcís in open flame form hydrofluoric acid &...

    Hfcís in open flame form hydrofluoric acid & carbonyl fluoride gases. Both highly toxic.

    Hcfc forms hydrofluoric & hydrochloric acid gases. All highly toxic.

    Read the sds on each....
  26. Replies
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    1,153

    I had to explain to a manager once who asked me...

    I had to explain to a manager once who asked me why i had a ladder rack, that it wasnít a ladder rack, but a canoe rack. Was on the road a lot so carried my canoe and fishing gear.
  27. I always left those issues to the equipment...

    I always left those issues to the equipment owners. In my report, in severe cases, would list contact info for local inspectors, state board, small claims court & bbb; licensed contractor or not. ...
  28. Replies
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    1,099

    Hardly. The best US brazer came in 57th. They...

    Hardly. The best US brazer came in 57th. They typically do brazing on production lines, well trained and had mentors. Plenty of practice. Competition is judged on time & quality. Would like to...
  29. Thread: Mcquay ACZ045AS27

    by ehsx
    Replies
    7
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    375

    Then it has the unt controller. That will...

    Then it has the unt controller. That will require pulling the wiring diagram and troubleshooting.
  30. Thread: Mcquay ACZ045AS27

    by ehsx
    Replies
    7
    Views
    375

    Does the unit have the microtech 200 or the unt...

    Does the unit have the microtech 200 or the unt 33 (johnson)?
    Mt 200 would have alarm history
    Unt 33 only alarm light
  31. Replies
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    1,099

    824499824500824501824502 From Daikin...

    824499824500824501824502

    From Daikin International skills competition in Japan. First 3 place competitors, 0hp rods, no nitrogen, near perfection.
  32. Replies
    27
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    1,099

    Recommended. But if oxygen flow to the inside is...

    Recommended. But if oxygen flow to the inside is blocked and the pipe is not overheated brazing will not cause carbonizing inside of the pipe and no discoloration.
    Larger pipes this becomes more...
  33. Detek or H10 used properly are more than adequate...

    Detek or H10 used properly are more than adequate for field use. .006-.1oz per year .....
    Better to invest difference in training.
  34. Replies
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    529

    carrier charging fixed

    824490
  35. Replies
    14
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    529

    66*f return air? Really need air? Return ewt...

    66*f return air? Really need air?
    Return ewt bulb? Ssh appears low/over charge.
    Low dt would not indicate low air flow.
    Evap approach does not appear high. Leaving wbt?

    Refer to orifice...
  36. Replies
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    673

    I would add, donít stop there. Continue taking...

    I would add, donít stop there. Continue taking individual classes related to this field; computer, welding, controls, first aide, etc, and any available workshops and any other available training, in...
  37. Decide which one is primarily, have it energize a...

    Decide which one is primarily, have it energize a relay to open the control circuit on the other unit.
    Or use a timer with no/nc contacts and a relay to alternate the units during peak.
  38. Replies
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    600

    Chatter due to low voltage at the coil or coil/...

    Chatter due to low voltage at the coil or coil/ relay issue.
  39. Thread: TXV Freeze up?

    by ehsx
    Replies
    5
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    436

    Suction must be below 32*f sat and there must be...

    Suction must be below 32*f sat and there must be water in the circuit.

    The txv equalizer line may be plugged. What is the ssh and air temps? Other readings? Txv controls ssh not pressure so...
  40. Replies
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    680

    Couple of old school conflicts: No double risers...

    Couple of old school conflicts:
    No double risers on scroll or low oil volume compressors. Rarely needed for comfort cooling.
    Use ASHRAE riser tables for minimum velocities for oil return in all...
  41. Replies
    14
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    7,327

    Refer to Trobocor application manual for the...

    Refer to Trobocor application manual for the compressor envelope. At chillwatetr setpoint of 45*f tower water should not go below ~ 70*f. Problem is during pulldown if tower water is not high...
  42. Replies
    5
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    329

    Depends. May have to be a "certified" or...

    Depends. May have to be a "certified" or "approved" class. In some cases good for license renewals or other certifications. You will need to verify.
  43. Replies
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    742

    Are you getting a water flow alarm or freeze...

    Are you getting a water flow alarm or freeze stat? Typically flow is auto reset. What is the panel alarm?
    1. Have water pressure taps installed across the chiller barrel to verify flow is within...
  44. Replies
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    1,019

    Less than 70% fill when cut open. Lack of...

    Less than 70% fill when cut open. Lack of preheat, heat location application. More focus on cap than flow. Using Harris 0, 5%, 15% & 45%.
  45. Replies
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    1,807

    Boil not freeze.

    Boil not freeze.
  46. Replies
    61
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    1,807

    824184 Need to have the water tp chart as...

    824184

    Need to have the water tp chart as much as a ref tp chart. Use for testing vacuum hold to tell if water in system or leak. Water will rise to saturation, leak will continue to rise.
  47. Replies
    18
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    1,153

    Had a cool pic of a Daikin van a few years back,...

    Had a cool pic of a Daikin van a few years back, completely upside down. Got t-boned by a Mercedes sports car, nosed under the van a flipped it. Tech said hanging upside-down helped his prior back...
  48. Replies
    20
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    1,019

    Most people can do fairly well up to 1 1/8" pipe....

    Most people can do fairly well up to 1 1/8" pipe. Most failed initial testing on larger piping in classes I've taught.
  49. Replies
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    1,019

    Wet rags on larger parts. Like thermal trap...

    Wet rags on larger parts. Like thermal trap where rags may interfere with heat application.

    Main problems I've seen with most brazers are improper preheat, wrong tip size, wrong pressure...
  50. Replies
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    Harris 0ģ Description: Silver PhosCopper Brazing...

    Harris 0ģ
    Description: Silver PhosCopper Brazing Alloy
    This low cost alloy is suitable for most copper-to-copper or brass joints where close tolerance can be maintained.

    This is used by some of...
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