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  1. What? I admittedly don't know anything about...

    What? I admittedly don't know anything about MVAC, but I know that there's no "max desired temp of 60 degrees". Most automotive refrigeration compressors are designed to operate in the winter when...
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    Sure "you're never too old", but getting hired by...

    Sure "you're never too old", but getting hired by somebody in the real world might be tough. I went to tech school with a guy who was around that age. Towards the end of the program we found that...
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    No! The way that a bypass humidifier works is...

    No! The way that a bypass humidifier works is that the air that goes through it is pushed into it from the supply, and sucked out of it from the return. This is the only way that air (and humidity)...
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    This thread's gone off of the rails a little bit,...

    This thread's gone off of the rails a little bit, but now I get what you're saying. When I think of that training center I always think Crystal, not Brooklyn Park. Whatever. I'm a proud 539 boy...
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    Oh, there's lots of pneumatics still out there in...

    Oh, there's lots of pneumatics still out there in lots of old schools and churches and government buildings. It's funny you mention Brooklyn Park since the company I work for takes care of some of...
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    One of these... ...

    One of these...

    https://i.ytimg.com/vi/9wakNyrf4dE/hqdefault.jpg

    I'm just kidding, kind of. Thought I'd just throw this up here to see how many people actually know what it is. My real vote...
  7. Kind of an odd question. Steam boilers can be...

    Kind of an odd question. Steam boilers can be used for anything from dry-cleaning to generating electricity. My guess would be that for an office building, the steam is probably used for comfort...
  8. Probably because it's a used piece of junk. ...

    Probably because it's a used piece of junk. That's the risk you take when buying used stuff without knowing what you're looking at and/or being able to test the thing before purchase. ...
  9. Well, not really but kind of. They make an...

    Well, not really but kind of.

    They make an adapter to be able to screw an air/acetylene regulator onto a little mc tank. So that might be able to get you out of a jam if you run out of O2 and you...
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    Conduit does not make for very good insulation,...

    Conduit does not make for very good insulation, and insulation does not prevent damage very well. If you were to theoretically use refrigerant hoses you would need to insulate them with INSULATION,...
  11. Thread: Need work

    by ammoniadog
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    Good point. I sure hope his resume doesn't say...

    Good point. I sure hope his resume doesn't say that he's "detail oriented". Kids these days. :whistle: :gah: :Faint:
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    Thanks. There's a lot of union fitters within...

    Thanks. There's a lot of union fitters within HVAC-Talk. I realize that unions aren't for everybody, but I am very proud to be a part of the union that I belong to. From what I can tell, there's...
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    I must have had a different experience than most...

    I must have had a different experience than most of you guys. I went to a 2 year tech college and very much thought it was worth it. They taught me ohms law and how to read wiring diagrams and how...
  14. I doubt moisture could somehow make the...

    I doubt moisture could somehow make the refrigerant slip through the metering device faster. :whistle:

    Moisture could cause a restriction (high superheat), but if you are saying you have low...
  15. Could you explain more about this extra suction...

    Could you explain more about this extra suction line? Are you saying it was an evap coil with one inlet and 2 outlets, or was it a normal evap coil with the 2nd suction line added after it? Double...
  16. Nice guess rider, but if he was getting 220 psi...

    Nice guess rider, but if he was getting 220 psi on one of the access ports, then I think that rules out a mini-split.

    Blackburn, did you have low superheat to go along with your low suction...
  17. I'm sure R410a would probably work, it's just...

    I'm sure R410a would probably work, it's just that (to my knowledge) there aren't any medium temperature expansion valves designed for use with R410a. I have a feeling that a normal air-conditioning...
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    Like rider77 said, compressor failures are...

    Like rider77 said, compressor failures are usually caused by something. Could be an oversized system hooked up to undersized ductwork, could be a mis-matched indoor coil, could be a faulty or...
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    As to my understanding, locking caps are now...

    As to my understanding, locking caps are now required by national code on any refrigerant schrader valve that might be accessible by the public. In my area, this means pretty much anything that...
  20. Do they still sell residential dry-charged "R22"...

    Do they still sell residential dry-charged "R22" type condensing units? I'm thinking a cheap one of those hooked up to a real walk-in cooler evap, pumping either 404A or 407C. You would probably...
  21. It sounds to me like the insulation within the...

    It sounds to me like the insulation within the unit's walls may have broken down. I recommend calling for service and paying someone to reinsulate the unit's walls.
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    Yeah, when its -20°F that CCH is a good thing to...

    Yeah, when its -20°F that CCH is a good thing to have
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    Where I am, in Minnesota, most walk-in...

    Where I am, in Minnesota, most walk-in cooler/freezer condensing units are not in a penthouse or any type mechanical room. They sit out in the open on top of flat roofs and need to keep operating...
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    YOU are the one who needs to think about how a...

    YOU are the one who needs to think about how a txv works. This might be a hard concept for someone from Texas, but imagine it's colder outside than it is inside of the cooler or freezer, and you...
  25. Well, that's a relief! (Not so much that it's...

    Well, that's a relief! (Not so much that it's going to be OK, but more-so that you didn't post any more pictures). We'll take your word on it.

    :cheers:
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    Huh? A window unit has "wings" or whatever...

    Huh?

    A window unit has "wings" or whatever they're called that expand to hold them into a window opening. A PTAC (which is what I think you are asking about) doesn't. Also, a PTAC usually won't...
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    I'll take a quick stab at a couple of your...

    I'll take a quick stab at a couple of your misconceptions...

    The liquid line and the expansion device are BEFORE the evaporator. If they were restricted, it wouldn't cause "liquid to back up in...
  28. Your solution of putting a cap over the pipe is...

    Your solution of putting a cap over the pipe is probably about the best that can be done.

    I don't think there's anything specifically wrong with your furnace. I agree that it's probably not a...
  29. When I first started out I was given a garden...

    When I first started out I was given a garden hose, a pump sprayer, and a van. I was sent to wash a bunch of rooftop unit condenser coils with pretty much zero clue as to what I was doing. I was...
  30. Aeroquips are still around. For some reason they...

    Aeroquips are still around. For some reason they are common on ice machines that have remote condensers, and every once in a while I'll see a walk in cooler with those fittings.
  31. Of course I can't see it from here, and there may...

    Of course I can't see it from here, and there may be other issues with it that we don't know about, but if one circuit still has refrigerant and a working compressor it should be fairly easy to rig...
  32. Yikes! Sounds like you need to start looking for...

    Yikes! Sounds like you need to start looking for another free home, one with a better air conditioner.

    Do you know if both compressors are dead? Melted wires don't always mean a bad compressor. ...
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    Most walk-in freezer condensate pan heaters are...

    Most walk-in freezer condensate pan heaters are wired up with the rest of the heating elements. They usually are energized only in defrost mode. The drain pipe heat is usually energized all of the...
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    Wrong again. Strike two. Not low on...

    Wrong again. Strike two. Not low on refrigerant, because like you almost said, that would give you HIGH superheat (and LOW subcooling). From what I can tell from here, it's not a refrigerant...
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    Nope, not a refrigeration restriction, since that...

    Nope, not a refrigeration restriction, since that would RAISE your superheat.

    Sorry to hear about you having to try to deal with going to school during all of this COVID uncertainty. Good luck...
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    Please explain how a suction pipe that's 35°F...

    Please explain how a suction pipe that's 35°F could "show some icing".

    Also explain how it could have "nil superheat" and not be overcharged, especially when it also has high subcooling (do not go...
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    Except for alcohol. Disinfect yourself from the...

    Except for alcohol. Disinfect yourself from the inside out as often as you feel might be needed. :cheers:
  38. Capacitors don't care what direction they are...

    Capacitors don't care what direction they are mounted. Potential relays do, but not the capacitors. The 521 should work pretty much the same as the Kickstart, I wouldn't expect much difference. I...
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    Huh? I've heard of having to chase after a...

    Huh? I've heard of having to chase after a freezer that's running, but not one that's just walking? Either way, hopefully you're faster than it. :grin2:

    Are you asking about a drain PAN heater?...
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    What type of systems did your apartment building...

    What type of systems did your apartment building use for cooling before these things were installed?
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    Sorry, but that's not a living space. The living...

    Sorry, but that's not a living space. The living space is on the other side of the door that's shown in your 3rd picture. I'd bet most others who live in your building don't spend much time out on...
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    Poll: You ask a lot of questions. I feel bad for...

    You ask a lot of questions. I feel bad for whoever you eventually find to install this stuff and for the company that sells you the equipment. Actually I changed my mind, the company that sells you...
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    You're former HVAC president friend is wrong. ...

    You're former HVAC president friend is wrong. I'm guessing he was never an installer or service tech? That ENTIRE fan WOULD have to be ABOVE the slats for the unit to operate correctly. That...
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    I have also used R448a and/or it's identical twin...

    I have also used R448a and/or it's identical twin cousin R449a. I also agree that you should use a R22 expansion valve if going this route. Of course, if you're changing to a R22 expansion valve,...
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    I woldn't drill a bunch of extra holes and put...

    I woldn't drill a bunch of extra holes and put bunch of rods through the ceiling if the manufacturer doesn't tell you to. They designed and engineered it and said it would work, it probably will. ...
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    I guess that's better than 12" wide, or maybe...

    I guess that's better than 12" wide, or maybe not. Those are going to be some heavy bastards. Just getting them off of the truck will probably be enough fun, I don't have any idea how you're going...
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    Ha! You might be on to something. It's a lot...

    Ha! You might be on to something. It's a lot easier to insulate that suction line when that stupid thing-a-ma-jiggy isn't in the way. There... That's way better! :cheers:
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    Next guess would be dead animal inside of your...

    Next guess would be dead animal inside of your ductwork. If the main supply/return runs are accessible, have someone inspect them for tears or openings, or maybe a place where one of the 2" ducts...
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    How much of your "new system" is actually new? ...

    How much of your "new system" is actually new? What is the new Bosch outdoor unit hooked up to? I'm guessing you didn't get all new ductwork and diffusers? If so, are you still using a Unico air...
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    I don't know, but if the thing is a freezer, that...

    I don't know, but if the thing is a freezer, that means the refrigerant coming back through the "Suction side line" is probably SUPPOSED TO BE below freezing. That means that the copper will usually...
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