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  1. Follow up: On R404a side; installed new filter,...

    Follow up: On R404a side; installed new filter, cap tube and removed the suction drier. Vacuumed to 200 microns, charged 12 oz R404a. Suction 18#, suction line 38*F, Holding -60*C. Not bad for over...
  2. Good point. The cap tube is in an extension piece...

    Good point. The cap tube is in an extension piece sticking out of the low side condenser; I think and can take it out and protect the condenser section it goes into.
  3. Thank you. Sorry I was snippy.

    Thank you. Sorry I was snippy.
  4. I take all answers with a grain of salt. Even...

    I take all answers with a grain of salt. Even from the super smart people on this site.
  5. Keep looking.

    Keep looking.
  6. I thought my questions were reasonable, for...

    I thought my questions were reasonable, for reasonable answers, if not perfect in every detail.
    I emailed the same questions to the factory. They responded: "It does sound like a restriction,...
  7. It's as if nobody reads questions. I see better...

    It's as if nobody reads questions. I see better answers on facebook lately.
  8. Small old Tenney test chamber, high side questions.

    Test chamber, Tenney, TJR, S#25548-12
    What suction and discharge pressure should I expect on the high side, 404A, at startup, and at operation after 20 minutes? I believe my system has a restriction...
  9. I'm not a recruiter or manager, so I don't have...

    I'm not a recruiter or manager, so I don't have much details. I'm just a service guy, so I threw it out there to be nice.
    401K is 5% match I think and fully vested right away.
    Healthcare and...
  10. It's not supposed to be a selling point. It is...

    It's not supposed to be a selling point. It is the truth about Arizona. I'm not trying to keep unions out. I'm just telling you how it is here. I would not want some union person getting the wrong...
  11. Tucson AZ, commercial service manager and a good tech needed.

    DP Air Corp. is looking for a service manager and another experienced tech in Tucson, AZ. We have more work than we can do. Our work is mostly commercial package units, data centers, some hospitals...
  12. Replies
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    On gas pipes I don't tape over the first 2...

    On gas pipes I don't tape over the first 2 threads. Then I dope over all male threads and tape. They never leak.
    On refrigeration I tape if I think the fitting is going to go in too far, otherwise,...
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    4,203

    If you place a covid on an AC unit and you smash...

    If you place a covid on an AC unit and you smash another AC unit on it. The AC unit will kill the covid.
  14. Interesting. That the check valve takes the...

    Interesting. That the check valve takes the liquid into the condenser for one more loop. Do they do that to subcool it, or just to confuse me? So it looks like in cooling, the check valve screen is...
  15. Trane 2007 heat pump RTU piping understanding wanted

    I'm trying to understand the refrigeration flow of a 2007, Trane heat pump RTU, model WSC060A3R..
    It has a one direction drier, so the drier is only operative in heat. The check valve branches off...
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    That's good information you guys. I'm going to...

    That's good information you guys. I'm going to try to get back there ASAP. Thank you.
  17. Replies
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    1,408

    Water flow noise in chilled water pipes

    A one year old 2 story building has large chiller supply and return pipes making what sounds like flow noise throughout the 2nd floor. Sometimes the noise becomes loud high obnoxious pitch. Sometimes...
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    784

    Yes I did the plug already. Going back to replace...

    Yes I did the plug already. Going back to replace the pump.
  19. Replies
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    784

    That would be too smart to put a panel to inspect...

    That would be too smart to put a panel to inspect something. No, it does not have one. It's a nice office so I best put down a tarp. Arrrg. If someone could take photos of me removing it and...
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    4,911

    This has been fun reading.

    This has been fun reading.
  21. Replies
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    784

    Mini-split cassette pump replacement?

    LG, cassette mini-split, LMCN125HV, in an office.
    Is it difficult to remove the foam water pan to access and replace the condensate pump? I assume that's what needs to be done. The service manuals...
  22. So I went back in the cool morning to restart it....

    So I went back in the cool morning to restart it. It was low on refrigerant, which is interesting how the AXV operated giving high suction. Also found that this condenser will not work with this...
  23. That sounds like a bummer too. I've been...

    That sounds like a bummer too. I've been researching this condenser and compressor. The Copeland Mobile App shows running this at 38*F SST puts this compressor outside its' design. I will try to...
  24. Wine cooler, AXV, automatic expansion valve and other issues.

    I have never dealt with this type of wine cooler.
    Evaporator is an IRC coil, HS-31, designed for wine cooling apparently.
    Condenser, Copeland M6QM-H049-IAA-272
    I came to a wine cooler walk-in....
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    While the economy is hot because of the tax cuts,...

    While the economy is hot because of the tax cuts, deregulation, low fed rates and the general business cycle, it's a good time to try to fix some things with China. Tariffs are scary and may not...
  26. Thread: Liebert Parts

    by mccann
    Replies
    6
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    1,188

    Liebert is now Vertiv. Check their web site for...

    Liebert is now Vertiv. Check their web site for distributors, though the site seems to be down at this moment.
  27. It's for a Siemens MRI. What is a PITA? I can...

    It's for a Siemens MRI. What is a PITA? I can tell I don't like these CBox's before this is even started. The side panels look like they can't be removed when it's running without causing high head;...
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    I like the idea of dishwashing detergent.

    I like the idea of dishwashing detergent.
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    Safari 12.1.1

    Safari 12.1.1
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    I can not "Like" post

    When I click on the Like post, nothing happens.
  31. Manufactures instructions are not completely...

    Manufactures instructions are not completely clear. Mfg. instruction says vent the highest point. It should say vent all high points where air might get trapped.
  32. Thanks, I will look for those B&G books. To know...

    Thanks, I will look for those B&G books. To know is good.
  33. Yes, MRIs are a bear because when you're doing a...

    Yes, MRIs are a bear because when you're doing a PM, you can't shut them down without major scheduling. I hate when vents don't have a ball valve below them. You're like: I wonder if that vent works?
  34. If our installers had this knowledge before they...

    If our installers had this knowledge before they started piping, they could have avoided that highpoint and used less fittings. They did not need those 90s there. It was an unnecessary configuration,...
  35. Oh, that makes sense. Awesome.

    Oh, that makes sense. Awesome.
  36. Thank you. I have instructed the install crew to...

    Thank you. I have instructed the install crew to put air vents there.
    This chiller is a small Kraus process chiller for MRIs and CT scanners at a radiology place, which we have a lot of around...
  37. Here is a photo of the concern:

    Here is a photo of the concern:
  38. Will a small high point cause an air lock if not vented?

    How large of a high point in a closed loop chilled water piping system would require an air vent?
    I am tasked to fill and start a small Kraus process chiller for an MRI. It has air vents at the...
  39. It has an expansion tank, which is built into the...

    It has an expansion tank, which is built into the chiller and it is a bladder type, so what? That has nothing to do with the air vents that are supposed to be put at high points. I wanted to know if...
  40. It is a completely closed loop with no buffer...

    It is a completely closed loop with no buffer tank. The chiller is a new KKT Kraus small process chiller for a MRI machine.Process chiller piping.JPG
  41. Is an air vent always needed at every high point in a closed loop?

    How large of a high point in a closed loop chilled water piping system would require an air vent?
    I am tasked to fill and start a process chiller for an MRI. It has an air vent at a high point, but...
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    The controller expects the compressor to start...

    The controller expects the compressor to start and stop and pump down, so will give you an alarm regardless of what you jump out. Just go into alarm settings and disable that alarm for that circuit....
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    That's awesome!

    That's awesome!
  44. Thanks, but I was looking for fellow technicians...

    Thanks, but I was looking for fellow technicians who have experienced developing something or submitting ideas who might have some insight.
    99% of patents do not make money and probably 99.999% had...
  45. Thread: Sight glass

    by mccann
    Replies
    39
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    4,495

    Safety has never been a concern in where I am in...

    Safety has never been a concern in where I am in Arizona. It's a right to fall state.
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    I did 18 years in supermarkets and have now been...

    I did 18 years in supermarkets and have now been in commercial for 6 years.
    I was surprised to find unlike a nice supermarket where they have a store plan on the mechanical room wall with...
  47. When should I call an idea a business and what about selling an idea?

    I recently wrote a provisional patent application and registered an idea. I have several question about developing my idea and selling it.

    Should I start a business if: in my first year I may not...
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    10,154

    Oversized computer room cooling is getting very...

    Oversized computer room cooling is getting very common. On these smaller Liebert units, open the hot gas bypass some to rase suction pressure to give yourself a longer run time. Hot gas valve...
  49. Zone system on small office building confusion

    How does a zone, Trane Integrated Control System decide which thermostat or sensor is controlling the AC unit to come on or is it using some combination of sensors to decide? I have little experience...
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    If you invent a tool, and you don't get a patent...

    If you invent a tool, and you don't get a patent or provisional right away, and you use it at work, and someone sees it, it is considered as disclosed publicly, especially if you have waited a year...
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