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  1. Master bilt Bitzer Very low temp plasma unit

    Working on a plasma unit, SST temps in the -50 to -60 range. This particular unit has been a sneaky problem this year and I am wondering about the actual cause of the issue.

    The unit would fail...
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    High torque part winding start motors often won't...

    High torque part winding start motors often won't rotate until the second contactor pulls in.
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    Yeah, I got one getting on a plane in the AM. ...

    Yeah, I got one getting on a plane in the AM.

    They sure are proud of them.
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    Protocol rack, sq d remote breaker

    Anyone have much problem with the remote breakers in the protocol units?

    I haven't danced with many of these protocol units and was surprised to see them remotes in use for the defrost.
    ...
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    Lolely to indicate when the comp is running, when...

    Lolely to indicate when the comp is running, when defrost is on , and to power led temp read out is my guess
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    It will work just fine.

    It will work just fine.
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    Still fun to see folks from the past when these...

    Still fun to see folks from the past when these threads pop up. Many D's was certianly an interesting guy for sure, he hasn't posted for several years. Dave is still bouncing around here a bit.
    ...
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    https://www.trutechtools.com/Supco-Magnetic-Umbrel...

    https://www.trutechtools.com/Supco-Magnetic-Umbrella-Kit?gclid=CjwKCAiA5JnuBRA-EiwA-0ggPUcheoZj_RmqjoM10qjvfkOjZl3__TxEdDc4E27yDRT49cFue5xAYRoCv70QAvD_BwE

    Also have a 10 by 10 pop up.

    Take...
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    Pretty common on walk in freezers of the heat...

    Pretty common on walk in freezers of the heat craft group, they use those same valves on the tin can and scroll condensing units.

    They usally just split on that outer seam, the star cracks in the...
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    Bar coded by specification and compatibility then...

    Bar coded by specification and compatibility then indexed across search engines with geographical availability and cost.
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    We may be a lot closer aligned than you thought,...

    We may be a lot closer aligned than you thought, however, I must add "heavy is the head that wears the crown" to my comments.

    While I completely get that the rules must apply to everyone equally,...
  12. Uhm it was supposed to be a bit funny, see the...

    Uhm it was supposed to be a bit funny, see the smile face at the end???

    Its ok either way, we are all gonna live through it.
  13. What should you do?? Try and not post to topics...

    What should you do?? Try and not post to topics that started 8 years ago :)
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    There is a difference in "overload protection"...

    There is a difference in "overload protection" and "overcurrent protection" despite it being somewhat common for folks to use them interchangeably.

    There are a lot of things needed to be fully...
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    hvacker, clearly you completely fail to...

    hvacker, clearly you completely fail to understand what the word "right" means. Rights are protection from government, not employers. it is in no way a violation of law for an employer to opt to have...
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    Actually the inrush is the current to saturate...

    Actually the inrush is the current to saturate the rotor and starter with magntism.since it applies to transformers, coils and such I digress, it is not the "same" as LRA. Inrush doesnt account for...
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    309

    Oh my lol

    Oh my lol
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    It's a 10 to 1 transformer so you can expect the...

    It's a 10 to 1 transformer so you can expect the output to be 20.8 volts
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    Yes

    Yes
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    LRA is a little deceiving in terms, "Locked Rotor...

    LRA is a little deceiving in terms, "Locked Rotor Amps" is the amount of inrush current the motor will have MOMENTARILY as it begins to turn. It only exist for a few hundredths of a second. When the...
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    LOLOL LMAO LOL OHHHHH the irony, they called...

    LOLOL LMAO LOL

    OHHHHH the irony, they called you on your personal phone during working hours to offer you a job where they don't allow you to have your phone... uhm, perhaps they don't want you ...
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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...
  23. Add principles of refrigeration by Roy dosset

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

    I prefer a dial a charge.
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    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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    Actually there is significant differences in the...

    Actually there is significant differences in the refrigerant densities.
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    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...
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    Master bilt has some nice stuff.

    Master bilt has some nice stuff.
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    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....
  31. 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...
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    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...
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    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...
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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...
  35. 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...
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    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.
  37. Side jobber not wanting to leave money on the...

    Side jobber not wanting to leave money on the table :)
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    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...
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    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....
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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...
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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...
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    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...
  43. Thread: Airtime 500

    by idontgetit
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    I thought airtime 500 was one hour many years ago

    I thought airtime 500 was one hour many years ago
  44. 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...
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    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.
  46. 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...
  47. 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...
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    Poll: Only on hot gas defrost and then is usually 1"

    Only on hot gas defrost and then is usually 1"
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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
  50. Thanks for the feedback, I am indeed happy with...

    Thanks for the feedback, I am indeed happy with both of them as well.
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