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  1. I understand each plate has a flow orifice for...

    I understand each plate has a flow orifice for even distribution from supply header and different sizes for ammonia and freon refrigerants.
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    Hi edward 301. First establish a heat load for...

    Hi edward 301.
    First establish a heat load for each temperature control space.
    R22 and 404a are history so do not go there.
    I would recommend a self contained ammonia plant, plate heat exchangers...
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    529

    Check the sump strainer as well, pre oil pump and...

    Check the sump strainer as well, pre oil pump and if OPS has cycled too many times the bi metal trip can go out of spec., so new OPS needed as well. Good luck. Maka.
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    Probably not relevant but some low SST scrolls...

    Probably not relevant but some low SST scrolls have a third port for liquid injection oil cooling down by the oil sight glass.
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    529

    Is the crankcase oil heater getting oil temp up...

    Is the crankcase oil heater getting oil temp up to temperature before starting ?
    maka
  6. Hi Ohio Tech. thanks for up date. You are busy...

    Hi Ohio Tech.
    thanks for up date. You are busy with summer no doubt, we are in middle of a cold winter down here.
    Maka
  7. Hi TechmanTerry. I totally agree, identifying...

    Hi TechmanTerry.
    I totally agree, identifying the actual reason for winding failure is debatable and open to discussion always. I am just adding 10 cents worth to trigger more input from forum....
  8. An interesting debate on going. Where is...

    An interesting debate on going.
    Where is ohioTech in all this discussion, conspicuous by his non-comment.
    Add to the mix if a Y delta open transition starter system phase orientation L1L2L3...
  9. Hi. The first pic is a definite coil slot...

    Hi.
    The first pic is a definite coil slot failure, if first start failure then probably damaged insulation on wire when hammered into slots, would not necessarily show up with a meggar test but...
  10. System imbalance out of control and most likely...

    System imbalance out of control and most likely incorrectly designed and probably over loaded with high usage.
    Cyclic defrost if multiple evaps installed. One at a time.
    maka
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    The best thing you can do is educate your...

    The best thing you can do is educate your students in the SI Metric system. Seriously a lot easier for them to understand and grasp, and your self to teach.
    Maka.
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    Lower RPM with original fan blades will result in...

    Lower RPM with original fan blades will result in proportionally less air possibly less than. So when possible fit original OEM motor. Will save call backs at your expense.
    Maka
  13. Thread: NH3 Subcooling

    by maka
    Replies
    3
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    384

    The closer the liquid leaving temperature is to...

    The closer the liquid leaving temperature is to Saturated discharge temperature, indicates low non condensables factor in system.
    There should be no real issues working into ammonia systems the...
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    condensate carry over to ducting could be related...

    condensate carry over to ducting could be related to low dew point and high latent cooling effect stemming from under charged system.
    maka
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    AS PER POODLE. check phase identification, get...

    AS PER POODLE.
    check phase identification, get it wrong and you will get a vector shift and high transitional spikes and nuisance tripping.
    maka
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    Hi tcy612 Heat recovery is limited to de super...

    Hi tcy612

    Heat recovery is limited to de super heating discharge gas so as not effect the initial refrigeration plant.
    Use HX with double wall separation between water and refrigerant.
    Standard,...
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    890

    I understand R22 compressors are filled with...

    I understand R22 compressors are filled with synthetic oil to be compatible with R407C an R22 alternative. But still suitable for R22 if available.
  18. Thread: High pressure

    by maka
    Replies
    29
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    1,416

    Asking the obvious, did you charge system with...

    Asking the obvious, did you charge system with gas in liquid phase?
    Had a bottle the other day saying keep up right for liquid phase charging. Wrong had to be inverted for liquid.
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    As per previous comment, stops liquid migration...

    As per previous comment, stops liquid migration in off cycle. Plus reduces risk of freeze up in a pump down cycle.
  20. Thread: TXV

    by maka
    Replies
    9
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    583

    Possibly reversing valve passing hot gas to...

    Possibly reversing valve passing hot gas to suction.
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    1,302

    I have literally given up trying to carry all...

    I have literally given up trying to carry all possibilities, I would need a 10 ton truck just for multi refrigerants possibilities alone, recovery system unit and , recovery bottles. Let alone all...
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    Had an unfortunate experience commissioning a...

    Had an unfortunate experience commissioning a super large cold store room with multi evaps electric defrost and termination stats on each each evaporator. PLC control system programmed wrong, first...
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    986

    Try extending coil pre chill period after defrost...

    Try extending coil pre chill period after defrost and before fans start, to remove excess defrost heat from coils. Reduces room pressurization and blowing out flexible roller door.
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    This is the Ask Our Pro's forum. In order to post...

    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread....
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    549

    Hi, TXV are designed to regulate/ control with...

    Hi,
    TXV are designed to regulate/ control with specific conditions, ie., evaporator TD., air on versus coil evaporation condition them regulate the suction super heat accordingly. By reducing...
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    Can only suggest you create a deception and paint...

    Can only suggest you create a deception and paint literally everything above a practical level mat black and have suspended down lights at that level. So as there is no upward light or reflection....
  27. Thread: evaporator td

    by maka
    Replies
    11
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    3,233

    It is important to know the evap TD as described...

    It is important to know the evap TD as described by phase loss when checking and or adjusting super heat on expansion valves. The method applies to all evaps, water , air . Airconditioning and...
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