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  1. Replies
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    i dont check insulated lines. removing the...

    i dont check insulated lines. removing the insulation can speed up the degradation process. i will replace when they are leaking or at a major overhaul or other some such major repair.
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    What do you need it for?

    What do you need it for?
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    Not to say that creative innovation canít happen,...

    Not to say that creative innovation canít happen, however, manufacturers scrimp and pinch to get every energy dollar out of their units. While some will sacrifice energy savings in the name of first...
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    Cause carbon steel is cheaper. I do see more...

    Cause carbon steel is cheaper. I do see more lines going stainless every year.
  5. Thread: YAEP99XD9B50PA

    by jayguy
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    299

    Maybe the display has failed.

    Maybe the display has failed.
  6. Thread: YVAA fan motors

    by jayguy
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    390

    i went through my current notes and didn't find...

    i went through my current notes and didn't find anything from the factory. i have only had 1 condenser fan issue on 1 unit. several of the other techs in my office have noted more condenser fan motor...
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    The L10 bearing life is based on an idealized...

    The L10 bearing life is based on an idealized load and other design factors that most people wonít have access to. And it only pertains to bearings.
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    Not sure what kind of equipment you have, but...

    Not sure what kind of equipment you have, but R134a typically will not have bubbles in the liquid line sight glass. With 8K subcooling, I would suspect non-condensibles in the system, a different...
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    While I havenít been a part of an energy...

    While I havenít been a part of an energy management company, I have seen companies that come in promising to save money. One of their caveats is that any equipment problems are on the hospitals bill...
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    i apologize...i was shooting from the hip a bit...

    i apologize...i was shooting from the hip a bit and thinking of Refrigerant Flow Rate instead of COP. you are correct that you don't need the enthalpies to determine COP.
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    this measurement method is used in some chillers,...

    this measurement method is used in some chillers, however, there is something to be noted...the temperature at the outlet of the TXV is not necessarily the same as the temperature after the...
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    for COP, you will need to calculate the enthalpy...

    for COP, you will need to calculate the enthalpy of the evaporator, condenser and discharge refrigerant.
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    The "30" is a common misconception. it is 24 for...

    The "30" is a common misconception. it is 24 for evaporator and condenser. the 30 is an attempt to take into account full load motor heat as well as the refrigeration load. But in todays world of...
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    i dont see any diagrams except for part of one...

    i dont see any diagrams except for part of one that shell posted
  15. Thread: At speed alarm

    by jayguy
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    358

    If you are at speed, the cops shouldnít have...

    If you are at speed, the cops shouldnít have pulled you over. Donít pay the ticket.
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    I was told by a Trane bearing engineer that if...

    I was told by a Trane bearing engineer that if you have to use the puller to remove the bearings, you will need to get new bearings. Apparently, they are damaged (or damaged just enough) when moved...
  17. Thread: Trane Headache

    by jayguy
    Replies
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    892

    If you donít know whether or not it is flooding...

    If you donít know whether or not it is flooding back, than you havenít done your job yet. You need to actually put your gages on it. You need to put your temp sensors on it. You need to log the...
  18. Thread: York YR

    by jayguy
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    535

    what does this mean? and what error EXACTLY?

    what does this mean? and what error EXACTLY?
  19. Thread: Trane Headache

    by jayguy
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    892

    yes it can. or between circuits but that is rare....

    yes it can. or between circuits but that is rare. it could be that a leak was repaired and the circuit wasn't fully recharged. it could be that someone removed charge due to a dirty condenser coil...
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    I do not know. I wouldnít put the Danfoss back in...

    I do not know. I wouldnít put the Danfoss back in anyway.
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    I have . It comes as a kit and is pretty easy...

    I have . It comes as a kit and is pretty easy except for some miscellaneous copper fittings and insulation you may need. The Sporlan EEVs work very well. The Danfoss EEVs suck and are only slightly...
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    I didnít know they discontinued the TXV. Of...

    I didnít know they discontinued the TXV. Of course, the Danfoss TXVs were junk on their best day.
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    just joking around with shell. as for the...

    just joking around with shell.

    as for the refrigerant, R123 weighs 25% more than R22 per cubic foot. also, oil is approximately 56 to 65# per cubic foot, so if you have a lot of oil in your...
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    I know you are finished with this job, but once...

    I know you are finished with this job, but once you switch to vapor recovery, install a portable purge on the tank. It will speed up the recovery in vapor mode by keeping the tank pressure down....
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    I put fieldpiece meters in them myself.

    I put fieldpiece meters in them myself.
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    Depends on what you are putting in it.

    Depends on what you are putting in it.
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    It does matter but he is in charge and...

    It does matter but he is in charge and responsible for the job so leave it alone.
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    If you have a primary lower voltage than the...

    If you have a primary lower voltage than the transformer is rated for, you will put out a lower secondary voltage. If you have the ability to change the tap to a more accurate entering voltage, then...
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    Diagnosing a contactor based on how its contacts...

    Diagnosing a contactor based on how its contacts looks is damn near impossible unless you are looking for work.

    but a very easy way to diagnose their condition is to measure across the...
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    We are well known for our large fish in Iowa.

    We are well known for our large fish in Iowa.
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    We have a 5000# fish scale. Works well for that...

    We have a 5000# fish scale. Works well for that size.
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    I would ask why the filtration needs to be that...

    I would ask why the filtration needs to be that good. Perhaps there is something in the water? “Normally” you do not need such high filtration after start up.
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    I only perform oil changes when the oil analysis...

    I only perform oil changes when the oil analysis says to or a major overhaul or a problem developed that would require it. This is for low pressure, high pressure, whatever pressure chiller I have.
    ...
  34. Your welcome! Of course, I didn’t invent it....

    Your welcome! Of course, I didn’t invent it. There is a downside. Obviously, every actuator has to have a feedback signal..which is more money. And this means that every actuator could overdrive the...
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    A phase rotation meter is handy in such cases.

    A phase rotation meter is handy in such cases.
  36. Thread: Big wheel

    by jayguy
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    678

    keep on turnin’. Proud Mary keep on burnin’.

    keep on turnin’.
    Proud Mary keep on burnin’.
  37. Replies
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    A “one size fits all refrigerants” sensor isn’t...

    A “one size fits all refrigerants” sensor isn’t likely to ever happen or be reasonably priced. I am waiting for the day when a manufacturer quits the “old stuff” in order to make a more sensitive...
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    So, are you stating this or are you...

    So, are you stating this or are you reading/quoting it from somewhere? And if it is true, it means that there is a lot of union potential out there or the unions are in serious decline. If it isn’t...
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    What does this mean? one of the problems in...

    What does this mean?

    one of the problems in this industry (and perhaps in all industries) is common terminology. However, the terminology can also limit the industry to “standards” and those...
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    I prefer to talk to my customers leak rates in...

    I prefer to talk to my customers leak rates in terms of hogsheads/millennia. Perhaps you do as well so I converted your 0.00000107 ounces/sec to roughly 41.8446 hogsheads/millennia.

    your welcome....
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    I would think that “Reefer Hand” would mostly...

    I would think that “Reefer Hand” would mostly apply to California and Colorado residents.
  42. Replies
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    The noise changes when you adjust the valve...

    The noise changes when you adjust the valve position? Seems like that is where your problem lies. Many valves aren’t meant to be at a very small open position. It may be that your pump is running too...
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    Brand? Model? Do you have any...

    Brand? Model? Do you have any readings/measurements? Anything possible with speculation.
  44. Replies
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    to tag onto B, a leak is an unacceptable orifice....

    to tag onto B, a leak is an unacceptable orifice. as such, if the pressure is 10 psig at one leak rate (i.e. 1 oz/year) and then you pump up the pressure to 50 psig, the leak rate changes to 2.24...
  45. I would also say no.

    I would also say no.
  46. Replies
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    Amen

    Amen
  47. If a valve is 95-98% open, speed up the pump. You...

    If a valve is 95-98% open, speed up the pump. You usually don’t wait until it gets to 100%. they may not get to 100% so you pick an arbitrary number close to 100%. There are drawbacks like any other...
  48. I donít usually get past the chiller paint but I...

    I donít usually get past the chiller paint but I have investigated the concepts and formulas to try and understand how they are messing with my chillers. I havenít seen anything discussed in...
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    I am not familiar with a voltage code of "52" in...

    I am not familiar with a voltage code of "52" in your model number. it is likely that you have "50".

    34% @ 4F FP means you are running propylene glycol.

    YLAA, size 350, 50 Hz, Brazed Plate Heat...
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    this is what i do and unfortunately, this is...

    this is what i do and unfortunately, this is true. let's say they are using the "wrong grease". you switch to the "right grease". the bearings fail (because of the years of "wrong grease")...who gets...
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