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  1. matvic1 The maximum pressure at case should be...

    matvic1

    The maximum pressure at case should be about 50psi at the case for 407A.

    Others have covered issues like: are CDS actually 100%, is the rack properly sized, are all compressors running,...
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    I don't see how that is with just one suction...

    I don't see how that is with just one suction line, but I have lots to learn.
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    For the stuff that need to be super accurate we...

    For the stuff that need to be super accurate we use Pace Scientific, I think they are based in North Carolina.

    Used them for years great support
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    Carlyle says a 3 psi drop per min this is after...

    Carlyle says a 3 psi drop per min this is after initial drop after you turn off compressor. This is a high side pressure.

    I believe copeland states a max rise of 2 psi per min from 0 psi.

    Make...
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    Alex It is really more like a text book, but it...

    Alex
    It is really more like a text book, but it is specific to industrial refrigeration.
    It covers both NH3 and HFC systems.

    The folks on this site hvac-talk will be a big help too.

    This is a...
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    As you learn more and are able to do more you...

    As you learn more and are able to do more you will be given more responsibilities, learn the basics, have a thorough understanding of the basics, when all else fails go back to the basics.

    A good...
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    High compression ratios and high suction return...

    High compression ratios and high suction return gas temerature greatly contribute to high discharge temps. R22 is one of the higher heat of compression refrigerants so that is a big contributor too....
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    We have used the media you ask about, like 270...

    We have used the media you ask about, like 270 indicated if you don't have enough cond fan power you can do more harm than good.

    I have found those thin sponge filters to be worthless if there is...
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    If building looses power expect to looses lots of...

    If building looses power expect to looses lots of co2, and expect to spend lots of time recharging it!

    They seem to use more energy than a conventional rack system, at least in our applications.
    ...
  10. All that work for nothing

    All that work for nothing
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    855

    No slime, a kind of an aqua green. We don't...

    No slime, a kind of an aqua green.

    We don't use any dye (at least that's what my guys tell me Ha!)

    I think I'm gonna hunt that dye thing, but I looked over past service history today and the...
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    Drier core green

    Pulled out drier cores (liquid line) the other day that were green.

    Low temp, scotch foursome rack, 404a, POE lubricant, oil clean.

    I'm guessing copper sulfate what you all think?
  13. Yep, I have my last drum of r12 to an aviation...

    Yep, I have my last drum of r12 to an aviation mechanic.

    Don't tell your wife.
  14. I would check those line sizes for proper minimum...

    I would check those line sizes for proper minimum velocity.

    As Mike says how about those t-stat and solenoid valve per coil, I'm not sure that would be a good thing.

    I have used Zerol 150 to...
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    I have seen screens sucked in like an accordion....

    I have seen screens sucked in like an accordion.
    Like JP lots of powdered aluminum and iron powder, and like rock says since POE lots of soapy gook with the other mixed in.

    I still say need to...
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    Actually the motor and control board are not...

    Actually the motor and control board are not synchronized are they, doesn't the board drive the motor a certain number of steps regardless of where the motor is positioned?

    I'm thinking the motor...
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    Chops that was a great video I gain from your...

    Chops that was a great video

    I gain from your hours of research

    Thanks
  18. Replies
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    Brian I do keep them laughing, but it's not my...

    Brian
    I do keep them laughing, but it's not my jokes it's the stupid stuff I do.
    I do like the FP they seemed a little hard to read in the sun (but I'm an old man and can hardly see anything)
    ...
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    Drill bit, I've been looking for that! Your...

    Drill bit, I've been looking for that!

    Your right probably all kind of scrambled parts in there, and it is probably plugging the oil intake screen.

    I have never had the "swap two legs" work...
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    I think you miss my point, if it throws a rod you...

    I think you miss my point, if it throws a rod you will blow oil out of the crank oil galley. Then you will have very low net oil pressure

    We don't have all the data but the suction looks high to...
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    Electronic manifold

    I'm going to get a set of electronic manifold, with micron gauge.

    I've had the Fieldpiece I liked them.

    Want to gets some ideas
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    How about the amp draw? Looks like lo head and...

    How about the amp draw? Looks like lo head and hi suction, is there vibration, if it's thrown a rod you can have very low net oil pressure.

    Refrigerant charge should not affect net oil pressure
  23. Replies
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    H-10 worth the extra money and trouble, a little...

    H-10 worth the extra money and trouble, a little harder to use, much mire accurate when properly used, just my opinion
  24. Replies
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    Most of my experience is with the Sporlan CDS...

    Most of my experience is with the Sporlan CDS valves

    I have found that when you have to reset the control board (or power it off) often that you generally end up replacing the operator (motor)....
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    Do you think most top techs are more interested...

    Do you think most top techs are more interested in real world training than an actual certification?

    I know I like the half and one day seminars that are about stuff I work on like supermarket...
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    Well it's 2013 and RSES is still here, I don't...

    Well it's 2013 and RSES is still here, I don't say that in a boasting way recent years have been tough.

    We do need to keep and grow our membership in a big way. We really need the support of the...
  27. Does anybody know of a dependable portable...

    Does anybody know of a dependable portable detector that read direct ppm?
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    Wouldn't the bulbs actually be connected parallel...

    Wouldn't the bulbs actually be connected parallel to the windings?
  29. Thread: Amp meter

    by steve wright
    Replies
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    9,161

    Thanks to all you for your input it is very...

    Thanks to all you for your input it is very helpful.

    I'm going to try the Fluke 376 or 902, I currently have a Fluke 30 so I'm comfortable with it.

    Thank so much
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    Removed sorry no *

    Removed sorry no *
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    Gary makes an important point you are using cfm...

    Gary makes an important point you are using cfm you have to look at mass flow in #/min
  32. Thread: Amp meter

    by steve wright
    Replies
    57
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    9,161

    Strkout I saw where it has the hold but does...

    Strkout

    I saw where it has the hold but does it hold max hold like when checking peak LRA?
  33. Replies
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    Hey I'm at 41 years and the only thing I know for...

    Hey I'm at 41 years and the only thing I know for sure is the more I learn the more there is to learn.

    In the field there are many things like instrument error that can make not add up.

    :grin2:...
  34. Thread: Amp meter

    by steve wright
    Replies
    57
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    9,161

    Amp meter

    What are some good meters that will lock in peak amps?
  35. Replies
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    It does for resistive loads the CCH is resistive....

    It does for resistive loads the CCH is resistive.

    You are right that it will not work with capacitive or inductive loads.
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    Better to eat crow with us than the customer! ...

    Better to eat crow with us than the customer! They make you eat the feathers too.

    Your doing what you should staying with the problem, I bet they will understand
  37. Replies
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    Yea I agree. Sometimes you can add a little AB...

    Yea I agree.

    Sometimes you can add a little AB lubricant and it will help bring oil back
  38. Replies
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    If you google copeland AE 4-1312 then go the list...

    If you google copeland AE 4-1312 then go the list of CCH for described scroll comp.

    They are heater wire not solid state in this range size.

    You might be waiting a while for them to get back. ...
  39. Thread: AB Oil

    by steve wright
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    2,774

    I don't know about Copeland but Genetron R422C...

    I don't know about Copeland but Genetron R422C says it will work with MO AB or POE lubricants, hence no oil change.

    My experience tells me that the AB will have fewer oil return problems in your...
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    Most of those heaters I've seen about 70 watts...

    Most of those heaters I've seen about 70 watts (with comp # we can find out exactly) with 230V that wold be about 0.3 amps. Hard to read.

    To get more accurate reading you can loop wire five times...
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    Are you saying you have less superheat after the...

    Are you saying you have less superheat after the heat exchanger? Colder at the outlet of heat exchanger than the inlet?
  42. Replies
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    If that comp had mineral oil and you put r401...

    If that comp had mineral oil and you put r401 without changing to alky oil I bet comp seizing up.

    As a last ditch effort you might try some Supco 88, sometimes it works sometimes not.
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    While you have that valve plate off you want to...

    While you have that valve plate off you want to check piston and bore for wear and damage, if it is air cooled (no oil pump) you will need to check the wrist pin too.

    When you drop a suction valve...
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    FYI to all regarding CM Exam, Jayson Goff will be...

    FYI to all regarding CM Exam, Jayson Goff will be presenting a CM Prep Session at the RSES Conference next week (11-14-2012 to 11-16-2012).

    There will be a lot of other educational stuff going on...
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    Installing a systematic leak detection system...

    Installing a systematic leak detection system will help and i guarantee you it will pay for its self. But like jp says you gotta fix the leaks.

    If the store is r22 and has a high concentration...
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    now your talking Mike

    now your talking Mike
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    That is a good point if you make everything up...

    That is a good point if you make everything up ahead of time you could prob change real quick.

    Most of those nozzles are removable, i wont say easily though, if it is corroded in it could be tough.
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    Mikeacman that was meant for Mrak you all were...

    Mikeacman that was meant for Mrak you all were talking about all kind of misspelled stuff your post 14 I think, I sure don't cast stones cause I'm the worst.

    I did think it was interesting how our...
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    Another point is if system was charged during the...

    Another point is if system was charged during the summer they may not have put enough in to flood the condenser during lower ambients when the OROA (or LAV) valve comes into play it will loose liquid...
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    Are we still talking about Mrak's unit? I'm...

    Are we still talking about Mrak's unit? I'm confused but that dont take much.
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