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ChokDee4213

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Everything posted by ChokDee4213

  1. Difficult to say, I haven't checked it directly and it's too late now that the technician just added refrigerant. I am hoping the coils are not the issue given that they were just recently replaced less than a year ago. There was no condensation coming from the unit inside the house itself if that's an indicator. The coil is copper. The return line was noticeably warmer prior to the technician's visit as well if that helps, but I didn't record exact temperature change. Someone above said that I cannot check if there is a leak by purging the system, taking it to 100PSI and measuring any drop off, is that true? If so, I think the best I can do is spray soapy water on the connection manifold and copper lines external to the compressor, but it could be a wild-goose chase. I imagine checking the coils specifically involves removing and submerging them and I might be better off just contacting the guy that recently replaced it.
  2. I didn't know that and was asking for confirmation on that point. 3 for 3 are pretty incredible odds for incompetency. Just out of curiosity, does anyone here have experience with HVAC that can comment on the situation with a little less conjecture? If not, that fine, thanks for your time.
  3. OK, what should it tell me? What would cause a reduction in refrigerant other than a leak that they are refusing to check for? Please enlighten me, so far your response is just not useful, I'm sorry.
  4. Not 100% on exact measurements, but around 10,000BTU for a 3x3x3m room I thought this was the DIY forum, not the quitter-talk forum. ???? kidding Really doesn't seem that hard or expensive though when the same tools and skills can be used over a lifetime.
  5. Hey guys, after a few months, the refrigerant in our mini split unit reduces and the air gets warm. From what I understand, the only cause of this is a leak. We've had 3 different AC repair guys come, they do a routine clean and add refrigerant for around ฿500. Each time we ask them to check for a leak and each time, they plug in a pressure gauge, confirm the refrigerant is low, take a cursory look at the copper tubing, then inform me that there isn't a leak. The last one even charged us ฿200 for this 2 minute facade assessment. They aren't charging the system to 100+PSI and measuring input and return pressure over time. They are not spraying the tubing with soapy water. They claim that a dirty filter, blocked exhaust, etc., is the culprit, but I understand these wouldn't typically cause a drop in refrigerant pressure. So my questions are these: Is my (admittedly limited) understanding about HVAC misinterpreting the situation(s)? Could they deliberately be facilitating a slow leak for repeat business? Or are they lazy and/or incompetent (3 for 3 though, surely this is unlikely)? And finally, anyone ever test for leaks themselves? If so, any areas I should check first other than the brazed joints throughout the line? General estimate on cost of tools? Can I just use a friend's air compressor and spare gauges, or will I need nitrogen specifically? I'd probably want an empty refrigerant tank to collect the refrigerant, then a full one to replace the refrigerant in the purged system right? Thanks, appreciate any advice anyone may have! The unit in question is probably about 4-5 years old and is in use every day. At this use rate, it needs servicing every 6 months(ish). This is an ongoing issue with all of our AC units depending on frequency of use since they were first installed.
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