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  1. Replies
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    That is indeed exactly what I am talking about,...

    That is indeed exactly what I am talking about, however your chart refrences only 3 refrigerants and we tend to deal with a lot more than that and the densities are far more broad.

    You may put 155...
  2. Add principles of refrigeration by Roy dosset

    Add principles of refrigeration by Roy dosset
  3. I prefer a dial a charge.

    I prefer a dial a charge.
  4. Replies
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    316

    I am discounting the evap and suction for smaller...

    I am discounting the evap and suction for smaller and simpler systems that are going to pump down so the amount of refrigerant in the low side is minimal. I agree on e it is up and running, the mass...
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    316

    Actually there is significant differences in the...

    Actually there is significant differences in the refrigerant densities.
  6. Replies
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    316

    How much refrigerant does it hold?

    So I get this question a lot from newer and some older techs a lot so I went on a quest to try and gather some info to share with them. I came up pretty dry actually, there are a couple of really...
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    Probably the main tools a refrigeration guy will...

    Probably the main tools a refrigeration guy will use that air guys won't use nearly as often would be a service wrench and a flaring tool.

    Air guys tend to have a TON MORE tools they need and...
  8. Replies
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    Master bilt has some nice stuff.

    Master bilt has some nice stuff.
  9. Replies
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    715

    Have had good luck with the bitzer set ups too...

    Have had good luck with the bitzer set ups too but no hot gas concerns at all, in fact other than a damaged 4 way valve on the one I installed about a month ago the hot gas hasn't given any problems....
  10. Sight glass is clear because you have 100% vapor...

    Sight glass is clear because you have 100% vapor going through it. 86 saturated and 98 line temp is 12 degrees superheated vapor.

    You need to measure your reciever and get your correct charge in...
  11. Replies
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    715

    Not sure why -40 is hard to explain, it can be...

    Not sure why -40 is hard to explain, it can be and is regularly done 6 hp is a little light unless there is a lot of time to cool the solvent before use.

    Using a 14 by 14 freeze to store and...
  12. Replies
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    715

    You can actually do the -40 with a 404a system...

    You can actually do the -40 with a 404a system running at a near vacuum SST. Depending upon the speed the load will be introduced will determine the size unit you are going to need.

    Not sure about...
  13. Replies
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    That you shouldn't be working on it??? Sorry...

    That you shouldn't be working on it???

    Sorry couldn't resist.

    You didnt mention leak repair so no idea, what made you think it had one?

    Frost at the compressor means virtually nothing on a...
  14. Get the degree, if you move to more commercial...

    Get the degree, if you move to more commercial work it will be of great benifit.

    An accounting degree is quite valuable but your working in a mechanical field. If you were going to open an...
  15. Replies
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    1,440

    Couple of small fans to circulate air with a...

    Couple of small fans to circulate air with a switch on the lid to cut them off when open seems a far more logical approach.
  16. Side jobber not wanting to leave money on the...

    Side jobber not wanting to leave money on the table :)
  17. Replies
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    1,530

    I would say my own observations led themselves to...

    I would say my own observations led themselves to the air to refrigeration transition being the more difficult one. it is not so much that it is different, it is how much less forgiving refrigeration...
  18. Replies
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    2,444

    Was tough week, started good, only 7.5 hours on...

    Was tough week, started good, only 7.5 hours on Monday, woo hoo turned into boo hoo and every day after that was a long one with Thursday and Friday going the 15 route and Saturday went long as well....
  19. Replies
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    Q = gpm x 500 x td Assuming 3 ton unit your...

    Q = gpm x 500 x td

    Assuming 3 ton unit your gonna need 7.2 gpm plus overcoming pipe loss, strainer, filtration and lift.

    By the time you get done, the power to move the water may eat up your...
  20. Replies
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    Pump down, inside or out if configured as...

    Pump down, inside or out if configured as described.

    Outside: pump down will keep the refrigerant out of the oil which will foam on start if saturated with it and can result in oil slugging as...
  21. Replies
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    628

    Most of the Asian junk hitting the market is...

    Most of the Asian junk hitting the market is throw away stuff. Had a customer get bent out of shape over the repair quote on a salad table. I was able to calm her down and advise her to buy a new one...
  22. Thread: Airtime 500

    by idontgetit
    Replies
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    280

    I thought airtime 500 was one hour many years ago

    I thought airtime 500 was one hour many years ago
  23. Well it's back online, freakin strange the second...

    Well it's back online, freakin strange the second vac took longer than it did the first time.

    Boss not going to can him which is good, trainees make mistakes and I am sure the boss has done it at...
  24. Replies
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    646

    Poll: Yeah I am with looney 100% on this. The ari...

    Yeah I am with looney 100% on this.

    The ari design standard is 125 act and the efficiency requirements of equipment are going to put that liquid line at design below the 105 threshold.
  25. Not really a tent, one of those 10 by 10 canopy...

    Not really a tent, one of those 10 by 10 canopy which is pretty handy when working in the rain or searing hot sun when you know your going to be there a while. I have worked out of service tents as...
  26. Sometimes it just darn near hurts when your work goes kaboom

    Long week for sure!

    Monday customer calls me direct and lets me know freezer is going down and they want me there asap so I tell em to call the office and that I have about an hour left on my...
  27. Replies
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    646

    Poll: Only on hot gas defrost and then is usually 1"

    Only on hot gas defrost and then is usually 1"
  28. Replies
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    Not cheap at all but hands down a solid and very...

    Not cheap at all but hands down a solid and very fast probe. I have the big brother as well for the larger systems and I couple them to the fluke 52
  29. Thanks for the feedback, I am indeed happy with...

    Thanks for the feedback, I am indeed happy with both of them as well.
  30. Replies
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    https://www.cpomilwaukee.com/milwaukee-48-22-8315-...

    https://www.cpomilwaukee.com/milwaukee-48-22-8315-packout-15-in--tote/miln48228315,default,pd.html?ref=pla-mobile&zmam=31282435&zmas=47&zmac=722&zmap=absneatag02s1p&gclid=Cj0KCQjwj_XpBRCCARIsAItJiuTI7...
  31. Opinions Appion core removal tool vs c&d core removal tool

    Well my finger slipped off the handle while pulling a high side core Monday and the roll pin sheared off my 18 year old c&d core tool. I would offer this tool sees a lot of use and while a large part...
  32. Mismanagement is what killed Sears, not Amazon....

    Mismanagement is what killed Sears, not Amazon. Sears more or less invented online ordering with catalog sales, they knew folks would order stuff from a picture in a book, often a black and white pic...
  33. Replies
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    Explore other sources of high inrush current...

    Explore other sources of high inrush current especially since it is a center tapped delta electrical system.

    Are the outdoor fan motors single phase? Are they drawing from B, the high leg? Are...
  34. Another in agreement about a solid ad. My...

    Another in agreement about a solid ad.

    My grandbabies are too important to bounce across the country these days.

    Travel yes, relocate not in my want list.
  35. Replies
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    Safety first, there is a reason commercial...

    Safety first, there is a reason commercial drivers are limited in the hours they can drive legally.

    I have had more than a few tough weeks and a couple we at the 80 hour range and I suspect I was...
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    Actually a very good idea if one sizes it up...

    Actually a very good idea if one sizes it up correctly, I have seen them engineered for conditioned space humidity removal and they worked quite well.
    I can't really think of a mini split...
  37. Just recently condemned a system for the same...

    Just recently condemned a system for the same reason as there is virtually no way to warranty any work.
  38. Lol

    Lol
  39. Replies
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    Defrost time with a water solenoid and spray...

    Defrost time with a water solenoid and spray nozzles to rinse them down a couple of times a day.

    The coils not the cows ;)
  40. If anyone really wants a good learn on PH...

    If anyone really wants a good learn on PH diagrams and the way enthalpy and entropy work check out sporlan literature, some of the best written stuff around
    ...
  41. Hi PHM, increasing the superheat closes the...

    Hi PHM,

    increasing the superheat closes the valve.

    I am going to try and explain this one more time.

    AC system, call it the perfect system running with a 40 SST, a 75 return, a 55 discharge,...
  42. [QUOTE=icemeister;25744364] I think your last...

    I think your last comment may indeed be false as there is no point in the thread that I said it was to maintain a set pressure.

    I made a very simple and accurate comment regarding increasing the...
  43. [QUOTE=icemeister;25744263]Either you have no...

    [QUOTE=icemeister;25744263]Either you have no idea how a thermostatic expansion valve actually works or you simply like to argue. :rolleyes:
    /QUOTE]

    I know exactly how they work, and I am well...
  44. Replies
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    1,010

    I have had them and haven't noted any strange...

    I have had them and haven't noted any strange readings. They spent a lot of time in the cold freezer and then taken to the 90 degree roof 3 floors up and no significant differences have been noted.
    ...
  45. Well since the suction line temp is going to be...

    Well since the suction line temp is going to be quite close to the leaving air temp and the valve can only open or close which is regulating the pressure I am not sure I agree.

    When the load...
  46. Simply to identify that the temperature change is...

    Simply to identify that the temperature change is what it is the molecular movement and not necessarily a change in heat content.

    If you crank the valve wide open and have 0 degrees of SH do you...
  47. About 35% of the heat leaving the compressor is...

    About 35% of the heat leaving the compressor is from the cooling of the electric motor and friction within the pump, if you are saying all of that applies the it is more, if it is only the pump like...
  48. Actually Ice, I identified it as a simple...

    Actually Ice, I identified it as a simple explanation and qualified it as "near adiabatic" as well.

    If you want a really good discussion on the 2nd law of Thermo, I would suggest Andy if he is...
  49. Then "by allowing it to occupy more space with...

    Then "by allowing it to occupy more space with the same heat content and reduced internal friction" would be the answer
  50. Replies
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    All of em, the air flow are the ones I was...

    All of em, the air flow are the ones I was worried about most as they sense moisture and not sure how good the after frost is for them.

    None have ever shown signs of dieing or shutting down early...
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