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Type: Posts; User: malcor

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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
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    993

    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
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    6,973

    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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    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
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    2,562

    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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    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
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    6,973

    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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    6,973

    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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    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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    6,973

    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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    6,973

    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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    6,973

    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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    6,973

    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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    6,973

    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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    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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    6,973

    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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    3,226

    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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    1,694

    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...
  26. Replies
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    603

    The maximum limit of a TXV is its rated capacity,...

    The maximum limit of a TXV is its rated capacity, and the power element in the case of a MOP rated valve. The capacity of a TXV shouldn't be significantly greater than the design cooling capacity of...
  27. Replies
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    That's interesting, as I didn't know that about...

    That's interesting, as I didn't know that about the new R22 replacements. They are not available here at the moment.

    I thought he meant R134a from a parts house that was sold as R134a but wasn't...
  28. Replies
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    3,643

    He must be referring to the counterfeit R134a...

    He must be referring to the counterfeit R134a from China, which consists of R22, R142b and R40.

    When this gas (the R40 component, methyl chloride) comes into contact with aluminium, it forms a...
  29. Replies
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    3,643

    I think it was just methanol. It was used to...

    I think it was just methanol. It was used to prevent any moisture in a system from forming ice and causing irregular flow out of the metering device.
  30. Replies
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    6,690

    So the Android app doesn't work at this point in...

    So the Android app doesn't work at this point in time? I was starting to think I had to be a professional member to use it!

    That would explain why I can't long in as well. I will uninstall it and...
  31. Well, that will fix it! It's a lot of money...

    Well, that will fix it!

    It's a lot of money for a customer to spend on an old AC, but they were up for the cost of the new compressor anyhow and in the end the repair cost would be less than that...
  32. Since both coils appear to be feeding at the same...

    Since both coils appear to be feeding at the same rate then the restriction is likely at the inlet of both cap tubes. Does it have a strainer?

    I would cut the liquid line before the cap tubes and...
  33. I thought that I explained myself clearly. :( ...

    I thought that I explained myself clearly. :(

    I have never worked on a RUUD split before, not living in the USA, and I can only go by what information the OP and everyone else has provided.
    ...
  34. I think that there is an interpretation error...

    I think that there is an interpretation error here.

    You are correct. A restriction in the feed circuit for an evaporator coil will result in high superheat and lower than normal suction pressure...
  35. The nominal capacities for the faulty and the...

    The nominal capacities for the faulty and the replacement compressors are 60800 and 61200 BtuH @45’F SST respectively. I am not familiar with imperial units, however, converting to metric leaves a...
  36. Actually, the suction line can frost up with a...

    Actually, the suction line can frost up with a restricted cap tube. If one of the two cap tubes were blocked, or severely restricted, then only half of the evap would feed correctly. As a result the...
  37. Were you able to determine why the compressor...

    Were you able to determine why the compressor failed?
    If may have failed as a result from liquid flood back to the compressor. The current operating conditions that you describe appear to point to...
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