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  1. Thread: txv selection?

    by cretan
    Replies
    15
    Views
    906

    Thanks

    Thanks
  2. Thread: txv selection?

    by cretan
    Replies
    15
    Views
    906

    Ok,forget about the previous post.If I have a...

    Ok,forget about the previous post.If I have a evaporator rated at 980 btu per 1 degree TD,it would supply 9800 btu at 10TD.correct?Now my question is how would I size the txv?1 ton,1.5 ton?now...
  3. Thread: txv selection?

    by cretan
    Replies
    15
    Views
    906

    txv selection?

    I used to know how to select txv's.I have been out of the trade for a couple of years.If a wic needs 8000 btu's of cooling, what size of txv do I use?Is there a chart I can use?
  4. Replies
    3
    Views
    511

    Thank you!!

    Thank you!!
  5. Replies
    3
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    511

    equipment sizing

    Can someone point me into the right direction?I need some info on sizing evaporators\txv's\compressors for walk in coolers\freezers.I was in the trade a few years ago and i am getting into it again...
  6. Replies
    3
    Views
    1,209

    Much appreciated.

    Much appreciated.
  7. Replies
    3
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    1,209

    m track controller

    Need info on make up airs equipped with the m track controller.manuals,scematics ect.thanks!!
  8. Thread: Myth or Fact?

    by cretan
    Replies
    14
    Views
    1,754

    Thanks guys.

    Thanks guys.
  9. Thread: Myth or Fact?

    by cretan
    Replies
    14
    Views
    1,754

    Myth or Fact?

    According to manuals,a compressor should not be bumped/started in a vaccum.I read a thread a while back that said the comp. could explode if stared in a vac.Is this true or false? PS:installed a...
  10. Thread: shocking!

    by cretan
    Replies
    11
    Views
    843

    assuming it runs on 120 volt.....check how it is...

    assuming it runs on 120 volt.....check how it is wired.many years ago(and still in older houses) if two appliances were plugged into the wall a certain way,touching the two appliances would give the...
  11. Replies
    35
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    9,920

    if no plaque showing charge,check superheat when...

    if no plaque showing charge,check superheat when box is down to temp.10 degrees SH would probably be fine.
  12. Replies
    4
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    737

    Thanks guru for the reply and info.In response to...

    Thanks guru for the reply and info.In response to skpkey9,No water in bearing.it was dry as could be.
  13. I have heard of this,but only on water lines in...

    I have heard of this,but only on water lines in the ground.Google and see what you can find...
  14. Replies
    4
    Views
    737

    Scotsman Flaker?

    A 400 pound flaker only about one year old.Bearings and auger were replaced 3 months ago on warranty.Worked on the machine the other day and found the top bearing coming apart.Customer is furious as...
  15. Replies
    29
    Views
    2,611

    I use a cooper clamp on thermometer.It is has...

    I use a cooper clamp on thermometer.It is has fast response time,is sensitive and seems to be accurate enough to get the job done.Yes,some responses given are not so helpful.I have been on the...
  16. Replies
    13
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    1,007

    I think "Blower" is slang/term for evaporator.I...

    I think "Blower" is slang/term for evaporator.I understood the posts,started as a joke.Some took it as a joke and some seriously.Oh....anyone with user name Satan here?Cuz some may find that...
  17. Replies
    13
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    923

    Here are a few other ideas and questions...

    Here are a few other ideas and questions also....If there's a history of electrical component failures,check for correct wire size going to the cond.unit.A long run of wire combined with too small a...
  18. Replies
    12
    Views
    951

    Thanks for the replies everyone.I don't plan on...

    Thanks for the replies everyone.I don't plan on touching the system.It has worked like this for years.So I won't fix if it ain't broken(Just as Executioner says).So now another question....since we...
  19. Replies
    12
    Views
    951

    I did a ptr check on the system.Worked on the...

    I did a ptr check on the system.Worked on the unit quite a while ago....High side acts like r22 and low side as R12/134.Txv is adjusted just about all the way open.Its a mix and matched system that...
  20. Replies
    12
    Views
    951

    It works.But why?

    Walk-in cooler 8x10
    RSN4-0050 r12 compressor
    keeprite R375 evap
    R12 txv
    air cooled
    Now here are some numbers:
    Box temp 37f
    suction line temp 63f
    subcool 46f
    HS 240 psi
  21. Replies
    8
    Views
    1,167

    Gradually add refrigerant,wait for the cooler to...

    Gradually add refrigerant,wait for the cooler to get to temp,then check superheat,this way you are assured it is not over/undercharged.It takes a little longer but it will be charged properly.
  22. Replies
    11
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    2,192

    Looks like a very thorough manual.Alot of...

    Looks like a very thorough manual.Alot of electronics on these new machines.Are there variable speed drive motors for the augers on these things?
  23. Replies
    11
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    2,192

    As far as what the machines do and how they work...

    As far as what the machines do and how they work is simple.There are alot of controls ect. that can get confusing but found them relatively easy to work on once I spent some time with them.And no I...
  24. Replies
    79
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    6,131

    Slow pumpdown?mabey the LLSV leaking by or bad...

    Slow pumpdown?mabey the LLSV leaking by or bad valve in comp.High evap superheat?Were evap fans changed recently?
  25. Replies
    28
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    2,328

    How about using a r22 replacement.R422 is one of...

    How about using a r22 replacement.R422 is one of them.Here is a link:http://www.refrigerants.dupont.com/Suva/en_US/products/isceon29.html
  26. Replies
    8
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    724

    All great replies,thanks.I am not working on a...

    All great replies,thanks.I am not working on a system now,just wanted to get some of the ideas out there.Thanks again!!
  27. Replies
    8
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    724

    How to diagnose LLSV?

    What is the best way to diagnose a leaking solenoid valve.Keep in mind some compressors don't have a rotolock to isolate the compressor.
  28. Replies
    25
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    1,903

    One more thing to look at..........Since the case...

    One more thing to look at..........Since the case is from italy the compressor probably runs on 50hz.
  29. Replies
    6
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    591

    I have seen alot of older than dirt units also...

    I have seen alot of older than dirt units also and thats what got me thinking.I have also noticed that the water cooled seem to be more efficient also.
  30. Replies
    6
    Views
    591

    Air cooled or water cooled?

    Would a compressor last longer with an air cooled or water cooled condensor?Water cooled units usually have a lower cond.temp right?Would that increase longevity?
  31. Replies
    7
    Views
    737

    What ambient temps at the condensor?

    What ambient temps at the condensor?
  32. Thread: Hp ratings

    by cretan
    Replies
    8
    Views
    628

    Hp ratings

    In the below pdf file the same compressor is rated both 1.5 hp and 3 hp.How do they come about this? Is the hp rated on btu capacity of different refrigerants?
  33. Replies
    11
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    2,192

    I worked for a company last year and did some...

    I worked for a company last year and did some service on slush machines mostly.A refractormeter is required to get the syrup/carbonation mixture correct.Alot of the newer machines have a digital...
  34. Thread: 404a or 134?

    by cretan
    Replies
    13
    Views
    1,426

    Well we will see if it works.The guy is using it...

    Well we will see if it works.The guy is using it for a cooler that is 8x10x8.I will post results.
  35. Thread: 404a or 134?

    by cretan
    Replies
    13
    Views
    1,426

    Thanks for the info ice.What is weird though is...

    Thanks for the info ice.What is weird though is that in my suppliers book this compressor is rated 5220@20 evap,120 cond,and 95 ambient,with 404a.What do you make of this?
  36. Thread: 404a or 134?

    by cretan
    Replies
    13
    Views
    1,426

    I know what you mean. I have a compressor rated...

    I know what you mean.
    I have a compressor rated for 134 that has 22 in it.Cooler works fine and low side pressures act like its 134 also.High acts like 22 though.
  37. Replies
    3
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    469

    Yes,the room the condensing unit is in..

    Yes,the room the condensing unit is in..
  38. Thread: 404a or 134?

    by cretan
    Replies
    13
    Views
    1,426

    So capacity would be lost in this case right?The...

    So capacity would be lost in this case right?The reason I asked was that I know someone that was sold a condensing unit and was told 134 would be used in system.I checked the compressor...
  39. Thread: 404a or 134?

    by cretan
    Replies
    13
    Views
    1,426

    404a or 134?

    Can a compressor that is listed in the copeland book as a 404a compressor be used with 134?
  40. Replies
    7
    Views
    659

    Copeland make the compressors.they list med temp...

    Copeland make the compressors.they list med temp and med ext temp
  41. Replies
    7
    Views
    659

    Compressor question

    I am looking in my suppliers book and there is a 404a med temp compressor and a 404a ext med temp.What does the ext stand for?
  42. Replies
    3
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    469

    Ambient temps and capacity?

    Lets say the required btu for a cooler is 7000 btu.At 25sst and 95 ambient this condensing unit puts out lets say 7700 btu.Another condensing unit is rated 25sst at 95 ambient but puts out 10,000...
  43. Replies
    25
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    2,227

    Thanks 404.I am also a mechanic but grew tired of...

    Thanks 404.I am also a mechanic but grew tired of that to make a living.I love refrigeration,its awesome.
  44. Replies
    24
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    1,099

    The headmaster,as mentioned above by-passes the...

    The headmaster,as mentioned above by-passes the condensor at low ambient temps to keep liquid line pressures up.proper refrigerant levels in these systems are imortant.
  45. Thread: Accumulator

    by cretan
    Replies
    5
    Views
    805

    Thanks for all the great info.Got one more...

    Thanks for all the great info.Got one more question though.Is compressor SH affected with an accumulator?Is compressor SH measured the same way with an accumulator?
  46. Thread: Accumulator

    by cretan
    Replies
    5
    Views
    805

    Accumulator

    Can an accumulator be used on a system with a ZP charged TXV?
    the accumulator helps reduce the chance of liquid back to the compressor right?
    any downside to having an accumulator on a system?
    ...
  47. Replies
    25
    Views
    2,227

    Thanks for the great info.Now more questions.. ...

    Thanks for the great info.Now more questions..
    Evaporator superheat should be around 10f correct?
    Lets say there is 10f @ evap and 40 sh at the compressor.
    some say it doesn't matter how much...
  48. Replies
    25
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    2,227

    Thanks 404

    Thanks 404
  49. Replies
    25
    Views
    2,227

    TXV selection confusion

    Lets say the compressor is rated at 6000 btu.The txv would be .50ton,correct?Now,here is where I am confused.What if the it is 8000 btu what txv do I use?.50 ton is too small and 1 ton is too big.
  50. Replies
    29
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    2,550

    400 psi was on the first compressor.I replaced...

    400 psi was on the first compressor.I replaced the compressor and since I couldnt figure out the problem,put a smaller charge in the system(which seemed to help a bit).mabey oil slugging was the...
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