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  1. Replies
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    Using similar logic (albeit simpler) to the...

    Using similar logic (albeit simpler) to the above, if the indoor unit coil was 1 and the outdoor unit coil was 2, then in cooling mode:

    2 + 1 = 3

    In heating mode:

    1 + 2 = 3

    Yes? :)
  2. Replies
    5
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    900

    Sounds like liquid refrigerant had condensed...

    Sounds like liquid refrigerant had condensed inside the compressor’s sump while it was off. Unless there was recent work done where oil was added to the system and it had somehow been accumulating...
  3. Replies
    49
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    6,209

    The problem with typing here on the forums is...

    The problem with typing here on the forums is that you don’t get the visual and tonal cues that you get from a normal face to face conversation. I'm not a condescending person at all and I really...
  4. Replies
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    6,209

    After noticing hostility towards me I started...

    After noticing hostility towards me I started reading around the other topics here. I have come to realise that people who are learning the trade are encouraged to ‘get their post count up’ with...
  5. Replies
    26
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    2,217

    This particular equipment is a S.E.T (Single...

    This particular equipment is a S.E.T (Single Electron Transistor) depositor. They use it in R&D for the design of hybrid semiconductors. The design that they were/are working on at the time was some...
  6. Replies
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    2,217

    I've done a bit of work on Edwards Cryodrive...

    I've done a bit of work on Edwards Cryodrive units, chilling an evaporator to about -450'F!

    The most recent repair was to replace a locked compressor. It was an off the shelf Copland compressor...
  7. Replies
    49
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    6,209

    You misunderstood what I wrote. I stated that...

    You misunderstood what I wrote.

    I stated that if R404a were contaminated with R410a or R407c (or any other refrigerant) that it would be highly possible. That is because there would be a lot of...
  8. Replies
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    6,209

    I agree with you. I just said that if a...

    I agree with you.

    I just said that if a customer told me that they thought that ‘such and such’ was wrong with their equipment that I would verify their claim.

    Almost on a daily basis I get...
  9. Replies
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    6,209

    You should re-read what I wrote. I wrote about...

    You should re-read what I wrote. I wrote about -40’F, about being the operative word. I intentionally wrote about because the actual set value of the particular TXV's superheat is unknown.




    ...
  10. Replies
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    6,209

    I'm not saying that by replacing the refrigerant...

    I'm not saying that by replacing the refrigerant it is the wrong thing to do either.

    The reason why I joined in this discussion was because I was questioning the method of diagnosis. I don't...
  11. Replies
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    6,209

    In my experience with R404a I would say a...

    In my experience with R404a I would say a definate no.

    However, fractionation would be highly possible if the refrigerant was contaminated with say R407c, R410a or even any other refrigerant I...
  12. Replies
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    6,209

    First of all, the OP stated that the owner said...

    First of all, the OP stated that the owner said that there were 'a possibility of mixed refrigerant' in the system. No other information in regard to that was given by the OP.

    So there may or may...
  13. Replies
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    6,209

    I disagree. Even mixed/contaminated refrigerant...

    I disagree. Even mixed/contaminated refrigerant can be diagnosed.

    If you have a proper understanding of the fundamentals of refrigeration and how the various components function then you can...
  14. Replies
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    6,209

    I agree with you on all of the above. We can only...

    I agree with you on all of the above. We can only go by what information the OP provides us, which in his view would be all the relevant information pertaining to the fault. Any other system...
  15. Replies
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    6,209

    You are right in the limited amount of...

    You are right in the limited amount of information. One of the most useful tools you possess is your powers of observation, and that is something that can’t be substituted for in a remote diagnosis....
  16. Replies
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    6,209

    Customers can sometimes provide useful...

    Customers can sometimes provide useful information or clues. In this example the customer said that there was a possibility of mixed refrigerant. That information may or may not be helpful, depending...
  17. Replies
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    I'm curious, do you actually repair commercial...

    I'm curious, do you actually repair commercial refrigeration equipment?

    Don't mean to be rude but your recommendations, and a couple of others, really has me wondering...
  18. I think one of the best preventions of theft is...

    I think one of the best preventions of theft is to not leave anything valuable in visible sight. If a thief can't see anything of interest, or of potential interest, then they would be less inclined...
  19. Thread: Mystery leak

    by malcor
    Replies
    27
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    2,985

    I have encountered that before. A couple of times...

    I have encountered that before. A couple of times it was due to refrigerant traveling up the condensate pipe from a leak that was in the water evaporator tray. I wasted time and effort looking for a...
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    I know this wasn't aimed at me, however, I just...

    I know this wasn't aimed at me, however, I just wanted to add that the wireless capabilities of the 570 are limited to IRDA (infrared) 1 meter Line-of-Sight. It was only intended to be used for...
  21. Replies
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    1,528

    I have a 570 and think the way the third input is...

    I have a 570 and think the way the third input is integrated into the instrument could have been done better. As it is, it's about only useful for documenting purposes. Well, I suppose that is one of...
  22. You must be a student. :) I can understand...

    You must be a student. :)

    I can understand why you would want to do that, as there isn't always a convenient access point to measure the pressure at the evaporator.

    Yes, you could measure the...
  23. Replies
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    Based on the those measurements and your...

    Based on the those measurements and your observations I would suspect contamination of the refrigerant (R22/R410a mix).

    Recover the refrigerant and try a clean charge in it.
  24. I now understand why you used the term total...

    I now understand why you used the term total superheat. You are thinking in reverse order and it is confusing you. :)

    The amount of superheating which occurs is in itself not meaningful....
  25. There is no such term as total superheat, in a...

    There is no such term as total superheat, in a typical system. There is only superheat.

    Superheat is a principle function of a system, and its measurement provides the means to correctly adjust...
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