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  1. Thread: Causes of mold

    by ehsx
    Replies
    4
    Views
    105

    Outside air conditions are not listed. Supply...

    Outside air conditions are not listed.
    Supply and return air conditions?

    Need complete log.

    Latent capacity is affected by coil refrigerant temperature, short cycling, air flow, approach,...
  2. Replies
    6
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    144

    Expansion tank? Size? Exv or txv? Air vented? ...

    Expansion tank? Size?
    Exv or txv?
    Air vented?
    8-10 dt with one compressor= low flow
    Ssh dip = probable flow loss= pressure swings

    Need complete log info.
  3. Thread: Vacuum Pumps

    by ehsx
    Replies
    79
    Views
    1,985

    If I cant get anything with one straw, I use a...

    If I cant get anything with one straw, I use a spoon.
  4. Thread: Vacuum Pumps

    by ehsx
    Replies
    79
    Views
    1,985

    825034 hose size matters

    825034

    hose size matters
  5. Replies
    12
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    336

    What he said. Inadequate defrost cycles.

    What he said. Inadequate defrost cycles.
  6. Replies
    23
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    850

    Ul, etl or listing agency for electrical ratings....

    Ul, etl or listing agency for electrical ratings. Components may not be sized for larger compressor& name plate ratings not correct.
    Check local codes.
  7. Replies
    4
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    250

    See if the chiller mfg requires the flow...

    See if the chiller mfg requires the flow switches, most do or include as standard.

    Bid spec should list requirements. Check job prints also.
  8. What does the condenser nameplate list?

    What does the condenser nameplate list?
  9. Thread: Vacuum Pumps

    by ehsx
    Replies
    79
    Views
    1,985

    If you are pulling thru 1/4 hoses, manifold, and...

    If you are pulling thru 1/4 hoses, manifold, and schraders; any pump over ~ 1 cfm is wasted effort. I think its Robinaire that has a chart showing effectiveness of pumps with different hose sizes.
  10. Thread: What's R12 worth?

    by ehsx
    Replies
    3
    Views
    228

    Check shipping before buying. Requires hazardous...

    Check shipping before buying. Requires hazardous materials processing. Limited shippers.
  11. Only needs a couple of screws and some paint! 🙈🙊🙉

    Only needs a couple of screws and some paint!
    🙈🙊🙉
  12. Short cycling will not remove moisture, can lower...

    Short cycling will not remove moisture, can lower temp causing more moisture migration.

    Typically 5-7 minute run times needed to begin condensation removal.
  13. Replies
    23
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    857

    5 12? 6 & 165# sounds boney thin.

    5 12? 6 & 165# sounds boney thin.
  14. The title of this thread is factious. Same...

    The title of this thread is factious. Same applies to methods of charging & leak testing.
    Recommendations and requirements vary with systems, history, conditions, ambient temperatures, critical...
  15. Thread: Short radius 90

    by ehsx
    Replies
    39
    Views
    1,261

    Short els are more prone to vibration and stress...

    Short els are more prone to vibration and stress breaks + more pressure drop.
  16. Dollar Tree, $1, pick up 2-3 different strengths....

    Dollar Tree, $1, pick up 2-3 different strengths.
    I use readers when at the computer or fixed close distance, trifocals if moving around.
  17. Replies
    4
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    242

    If the compressor will run, first do a service...

    If the compressor will run, first do a service pumpdown, with chill water flow. That will remove most refrigerant.
    If you recover from the bottom of the evap it wont freeze. Cant freeze unless...
  18. Replies
    23
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    850

    Possible high & low pressure issues. Poor...

    Possible high & low pressure issues. Poor efficiency, high amps, poor motor cooling, voided agency approvals, probable code violation......
  19. Replies
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    497

    No mfg that Im aware of will recommend it and...

    No mfg that Im 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?...
  20. Thread: maitnenace of AHU

    by ehsx
    Replies
    10
    Views
    481

    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...
  21. Replies
    19
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    757

    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.
  22. Replies
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    703

    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....
  23. Replies
    23
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    1,210

    Ive had rolled flanges (over torqued raised...

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

    by ehsx
    Replies
    54
    Views
    2,248

    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.
  25. Replies
    8
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    473

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

    What he said & check for short cycling & adequate discharge sh.
  26. Replies
    8
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    473

    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
  27. Replies
    12
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    467

    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...
  28. 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...
  29. Replies
    23
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    1,210

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

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

    by ehsx
    Replies
    54
    Views
    2,248

    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...
  31. What part of illegal do you not understand?

    What part of illegal do you not understand?
  32. 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...
  33. Replies
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    973

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

    Increases heat, reduces voltage, increases amps.

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

    by ehsx
    Replies
    54
    Views
    2,248

    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 ?
  35. Replies
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    973

    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...
  36. Thread: 5$ bet

    by ehsx
    Replies
    5
    Views
    1,031

    Need to change out the duct xtion?

    Need to change out the duct xtion?
  37. 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 .
  38. Replies
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    1,210

    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.
  39. Replies
    28
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    1,293

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

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

    by ehsx
    Replies
    21
    Views
    952

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

    I used to carry shovel, rake, hedge clippers & pressure washer. Keep em clean and clear.
  41. Replies
    28
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    1,293

    Oatmeal rasin.

    Oatmeal rasin.
  42. 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.
  43. Replies
    27
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    1,229

    Hfcs in open flame form hydrofluoric acid &...

    Hfcs 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....
  44. Replies
    18
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    1,258

    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 wasnt a ladder rack, but a canoe rack. Was on the road a lot so carried my canoe and fishing gear.
  45. 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. ...
  46. Replies
    27
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    1,229

    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...
  47. Thread: Mcquay ACZ045AS27

    by ehsx
    Replies
    7
    Views
    441

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

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

    by ehsx
    Replies
    7
    Views
    441

    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
  49. Replies
    27
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    1,229

    824499824500824501824502 From Daikin...

    824499824500824501824502

    From Daikin International skills competition in Japan. First 3 place competitors, 0hp rods, no nitrogen, near perfection.
  50. Replies
    27
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    1,229

    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...
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