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  1. Replies
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    Started with relays, now solid state controls &...

    Started with relays, now solid state controls & processors.

    Tístats an many ac & chiller controllers have minimum off time function and a minimum start to start function.
  2. Manual does not list High Discharge SH as an...

    Manual does not list High Discharge SH as an alarm. Sensor failure, Low dsh sh & high dsh temp is listed.....
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    NC is a right to work state. When I worked for...

    NC is a right to work state. When I worked for York, there was no incentive to be union.
  4. Replies
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    Reminded me of my grandmother telling me that she...

    Reminded me of my grandmother telling me that she and my greatuncle just sat around all day telling each other lies. Couldnít hear, see, or remember well enough to get their stories straight.
  5. Mosquitoes 🦟 lay eggs in bamboo and attract other...

    Mosquitoes 🦟 lay eggs in bamboo and attract other 🐜 . Invasive species. All according to online sources. I would have only assumed.
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    If its the expansion tank, when hot the relief...

    If its the expansion tank, when hot the relief would blow water. As the water temp drops air is circulated causing flow to swing, and ssh drop as the load is lost.
    Makeup automatic or manual? ...
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    Late 80's , early 90's. Facebook 2004 Body...

    Late 80's , early 90's. Facebook 2004

    Body wraps & decals for trucks are fairly inexpensive. Rare to get unjustified driving complaints and many places name & license # is required on service...
  8. First if you are only looking at 5,000 btuh there...

    First if you are only looking at 5,000 btuh there must not be any nighttime load.
    Need day & night loads.
    Heat exchanger could be tube in tube as used in water source heatpump or just use a water...
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    Tístat stickers, truck decals, radio ads. Always...

    Tístat stickers, truck decals, radio ads. Always looking for substandard maintained and operating commercial systems for cold calls.
    Prefacebook!
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    At Design dt flow is 2.4 gpm/ton. If you have...

    At Design dt flow is 2.4 gpm/ton. If you have 8-10 dt with one compressor you have closer to 40gpm.
  11. Thread: Causes of mold

    by ehsx
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    306

    oa humidity > 70% low evap dt check mixed air...

    oa humidity > 70%
    low evap dt

    check mixed air and air flow
    insure stable operation
    review chart conditions....


    825090
  12. Thread: Causes of mold

    by ehsx
    Replies
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    306

    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,...
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    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.
  14. Thread: Vacuum Pumps

    by ehsx
    Replies
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    2,458

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

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

    by ehsx
    Replies
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    2,458

    825034 hose size matters

    825034

    hose size matters
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    What he said. Inadequate defrost cycles.

    What he said. Inadequate defrost cycles.
  17. Replies
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    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.
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    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.
  19. What does the condenser nameplate list?

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

    by ehsx
    Replies
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    2,458

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

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

    by ehsx
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    274

    Check shipping before buying. Requires hazardous...

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

    Only needs a couple of screws and some paint!
    🙈🙊🙉
  23. 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.
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    5í 12Ē? 6í & 165# sounds boney thin.

    5í 12Ē? 6í & 165# sounds boney thin.
  25. 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...
  26. Thread: Short radius 90į

    by ehsx
    Replies
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    1,310

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

    Short els are more prone to vibration and stress breaks + more pressure drop.
  27. 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.
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    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 wonít freeze. Canít freeze unless...
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    Possible high & low pressure issues. Poor...

    Possible high & low pressure issues. Poor efficiency, high amps, poor motor cooling, voided agency approvals, probable code violation......
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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?...
  31. Thread: maitnenace of AHU

    by ehsx
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    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...
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    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.
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    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....
  34. Replies
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    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.
  35. Thread: Best install yet

    by ehsx
    Replies
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    2,351

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

    What he said & check for short cycling & adequate discharge sh.
  37. Replies
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    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
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    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...
  39. 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...
  40. Replies
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    How about a pressure test with an electronic leak...

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

    by ehsx
    Replies
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    2,351

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

    What part of illegal do you not understand?
  43. 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...
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    Increases heat, reduces voltage, increases amps....

    Increases heat, reduces voltage, increases amps.

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

    by ehsx
    Replies
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    2,351

    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 ?
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    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...
  47. Thread: 5$ bet

    by ehsx
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    1,091

    Need to change out the duct xtion?

    Need to change out the duct xtion?
  48. 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 .
  49. Replies
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    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.
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    Found my grandmother's recipe for molasses cakes....

    Found my grandmother's recipe for molasses cakes.
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