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  1. Replies
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    "Important: Use only R-134a and Trane Oil 00048...

    "Important: Use only R-134a and Trane Oil 00048 in RTAC chillers."
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    Iím used to terminology difference verbal and...

    Iím used to terminology difference verbal and written. Reviewed and written mfg literature. Edited out trade names and tried to use industry standards and often found there is no standard so just...
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    Pulley and Sheave: Difference Ever Power Ever...

    Pulley and Sheave: Difference
    Ever Power
    Ever Power
    Dec 6, 2019∑3 min read

    Pulleys have been used by mankind from time immemorial. They are used to make lifting heavy objects easier. A pulley...
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    Rarely find dampers stroked and operating...

    Rarely find dampers stroked and operating properly, especially on the coast.

    At least looks like a fairly easy fix.
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    One is as good as the other. Look at the mfg...

    One is as good as the other. Look at the mfg literature; Carrier may be worded either way, McQuay mostly uses sheave, Trane uses sheave, Aaon, York, Climate craft uses pulley.

    Far more...
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    First thing an apprentice should be trained to do...

    First thing an apprentice should be trained to do when changing filters.... should always use a tension gauge until you are used to the feel.

    Tension gauge, new & used settings.
    Correct pulleys &...
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    Had one vendor shipping wet coils to equipment...

    Had one vendor shipping wet coils to equipment mfg, water was from water based lube used on the expanders. 50 cfm vac pump would pull down to 500 microns rapidly, but would not pass a 30 minute hold...
  8. Thread: Odd motor problem

    by ehsx
    Replies
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    953

    I found if you rolled a crystal ball across the...

    I found if you rolled a crystal ball across the service literature it made a good magnifier and you sometimes could find the answer by looking into it.
  9. Thread: Odd motor problem

    by ehsx
    Replies
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    953

    Probably had to find someone to fill them out,...

    Probably had to find someone to fill them out, and who was able to fix the problem.

    Often, like here you canít make adequate recommendations without complete info. Was either a log sheet or a...
  10. Thread: Odd motor problem

    by ehsx
    Replies
    33
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    953

    I'm in agreement, but too often I've seen...

    I'm in agreement, but too often I've seen problems overlooked due to incomplete diagnostics. Will already be the second trip.

    There should already be a complete summary of reading and...
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    Key is donít get old. All the abuses you put...

    Key is donít get old.
    All the abuses you put your body thru in your 20ís & 30ís bite you in your 50ís- 60ís
  12. Thread: Odd motor problem

    by ehsx
    Replies
    33
    Views
    953

    Need mfg fan performance data. Model and...

    Need mfg fan performance data. Model and selections?
  13. Thread: Odd motor problem

    by ehsx
    Replies
    33
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    953

    Take total static pressure readings & motor rpm...

    Take total static pressure readings & motor rpm reading during both conditions. This will verify if air side.

    Check voltage, voltage imbalance, amp imbalance. Megg the motor & supply line...
  14. Thread: Oil Traps

    by ehsx
    Replies
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    523

    There is no definitive answer to your question. ...

    There is no definitive answer to your question. Simpler is better, but there may be a reason the offsets are not desired. The limited tel addition (~2.5-8') will have minimal effect that probably...
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    I was training manager for Dunham Bush 90ís. ...

    I was training manager for Dunham Bush 90ís. Used to say there would never be an oil shortage if everyone had a DB screw, typically always had excess oil, removed 5 to as much as 45 gals from...
  16. Thread: Oil Traps

    by ehsx
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    Don't think the difference in oil return would be...

    Don't think the difference in oil return would be measurable. More of an issue of space restraints than additional pressure drop.

    Cycles times need to be long enough to insure return oil. ...
  17. Hardly... ...

    Hardly...

    https://worldpopulationreview.com/country-rankings/countries-where-weed-is-illegal
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    Epa does not allow oil at pressures over 5psi to...

    Epa does not allow oil at pressures over 5psi to drain to open containers. Most scrolls do not have oil drains. Flooded evaps take the longest to recover the oil...
  19. Thread: Oil Traps

    by ehsx
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    365

    First sentence addressed you questions. 45 or...

    First sentence addressed you questions. 45 or 90 has no difference in velocity except based on circumference due to oil volume in the line.
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    One I got called in for: KYMFHO: keep your mud...

    One I got called in for:

    KYMFHO: keep your mud flipping hands off
  21. Thread: Oil Traps

    by ehsx
    Replies
    16
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    365

    Streel el 90s will move oil a small degree...

    Streel el 90s will move oil a small degree faster, 45s have a lower pressure drop but will hold slightly more oil. With single risers don't think much overall difference. On risers traps may be...
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    NO. Low dsh sh with normal ssh is main...

    NO. Low dsh sh with normal ssh is main indication.

    Used to see it frequently on McQuay ALS and other screw chillers, but without the pressure swings with tube/fin or water cooled condensers. ...
  23. Thread: Heat pump History

    by ehsx
    Replies
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    448

    As you stated duct design and diffuser selections...

    As you stated duct design and diffuser selections & placement were major issues in acceptance. Used to always heat "heat pumps blow cold air". That said I have dual fuel and the wife, always cold,...
  24. Often related. In high school during 69-72...

    Often related.

    In high school during 69-72 always wondered about "what's happening" until getting high ONCE years later. Never tried again.

    Went dove hunting once with a stoner, lit up in...
  25. Thread: Heat pump History

    by ehsx
    Replies
    8
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    448

    Heat pump History

    Summary of info exerts, not in order. Conflicting credits.:

    The principle of the scroll compressor was patented in 1905 by L.Creux. But the precision machining of these uniquely shaped parts was...
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    Summary from my training preso research:...

    Summary from my training preso research:
    Expansion tanks: used on closed loop circuits.
    Should be installed at a point where pressure changes are minimum when pumps are started and stopped.
    Open...
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    From observations I use the 1 in 8 rule for top...

    From observations I use the 1 in 8 rule for top techs, 2 in 8 for half a..., 1 in 20 I would put in the expert category and that is usually limited to areas of specialty. As a small business it is...
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    sent

    sent
  29. "The legal history of cannabis in the United...

    "The legal history of cannabis in the United States pertains to the regulation of cannabis (legal term marijuana or marihuana) for medical, recreational, and industrial purposes in the United States....
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    Need email address

    Need email address
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    You have the Turbocor cage valve, butterfly,...

    You have the Turbocor cage valve, butterfly, gate, or plug?

    Plug type was the latest. Normal flange bolt torque spec.

    I can email you a table if needed.
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    Eddie Murphy is really good .... A factory...

    Eddie Murphy is really good ....

    A factory product engineer told me one time to adjust the txv till the screw compressor sound changes, then back off 1/2 turn. Won't repeat what I told him.
    Next...
  33. Kind of like the torque method we used on nuclear...

    Kind of like the torque method we used on nuclear turbines when I was younger. Lapped the bolt & nuts, miked the bolt, used knocker wrench & 16# sledge to stretch the bolt a calculated %.
    I always...
  34. Inverted traps are recommended when connecting to...

    Inverted traps are recommended when connecting to a horizontal line with multiple connections where gas flow would pass over another tie in or if the connection is to a horizontal line where slope...
  35. Thread: Foot problems?

    by ehsx
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    Had plantar fasciitis a couple of times, came and...

    Had plantar fasciitis a couple of times, came and went, arch supports helped. Flat feet so picky on shoes. Mild Neuropathy due to diabetes, diagnosed 4 yrs ago, mostly feel like my socks have...
  36. How does digital prevent over-torque? Never used...

    How does digital prevent over-torque? Never used one.

    Personally prefer mechanical tools over electronic because of batteries and storage.

    Stop when it clicks and you donít over-torque. Back...
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    ASHRAE HVAC Applications, Chapter 8.15 (2015 ed)...

    ASHRAE HVAC Applications, Chapter 8.15 (2015 ed)

    ASHRAE standard 170 ; ...
  38. Thread: Recommended books

    by ehsx
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    I'm for free on the web. Danfoss, Trane,...

    I'm for free on the web. Danfoss, Trane, Sporlan/Emerson and others have free online training programs with test. Thousands of other free literature sources.

    The books I find most useful: ...
  39. Thread: Recommended books

    by ehsx
    Replies
    22
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    745

    A lot of the older materials have been scanned...

    A lot of the older materials have been scanned and are online. I spent a couple of years rebuilding a few York YAC chiller plants at Savanah River Plant & a couple of DuPonts, but the most...
  40. Thread: Recommended books

    by ehsx
    Replies
    22
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    745

    Thinking about either a book burning or ebay...

    Thinking about either a book burning or ebay sale. Retiring in Jan and have several book cases of reference materials acquired over the past 48 years. Couple of the interesting ones, ~1902 sailing...
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    .

    .
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    Try 48 years of factory services for 5...

    Try 48 years of factory services for 5 manufactures. Service, warranty, training, & consulting. Canít argue physics so attack .... sounds like politics.
  43. Replies
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    Not following mfg recommendations or best...

    Not following mfg recommendations or best practice is your choice.
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    From the cylinder. Thats why they make liquid...

    From the cylinder. Thats why they make liquid charging restrictors for low side charging.
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    1. Sump heater should be on prior to opening 2....

    1. Sump heater should be on prior to opening
    2. Charge should be in condenser
    3. Compressor discharge valves or check will limit rate of pressurization
    4. Typically the compressor sump volume will...
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    Tell me the saturated temp of R-22 or R-410a is...

    Tell me the saturated temp of R-22 or R-410a is at 500 microns.
    Guess you know better than all of the mfg designers and engineers. Unless all liquid boils out in your manifold or hoses it will...
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    Bad practice is bad practice. Always break deep...

    Bad practice is bad practice.
    Always break deep vac with vapor.
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    Liquid would enter the line set at temperatures...

    Liquid would enter the line set at temperatures way below your tp charts causing thermal shock to the evacuated portions. Opening the suction first allows only vapor to enter evacuated components...
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    downflow? might decrease or limit if up-flow...

    downflow?

    might decrease or limit if up-flow for oil return...
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