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Type: Posts; User: 71CHOPS

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  1. Replies
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    Maybe, but there is supposed to be a drain...

    Maybe, but there is supposed to be a drain too....sooooooo.
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    Be careful draining the tank, don't just unscrew...

    Be careful draining the tank, don't just unscrew that plug with the system under pressure.

    Drain all the system pressure to zero psi, close the isolation ball valve to the tank, then drill a small...
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    The equipment installation manual covers the...

    The equipment installation manual covers the required flu piping.....and no manual will tell you to just shove the flu pipe into an existing chimney.....unless the pipe is ran to the roof.

    Just...
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    Yup, sounds like it's toast. When you fix it,...

    Yup, sounds like it's toast.

    When you fix it, be sure to install a T fitting with a drain between the existing ball valve and the tank.
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    DO NOT drain the system. Follow the procedure...

    DO NOT drain the system.

    Follow the procedure I outlined.

    Shut the pump off, bleed air at the highest point, start the pump, let it run about 10 minutes or less, shut it off, bleed air. Rinse...
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    Plugged filter drier or plugged screen at the...

    Plugged filter drier or plugged screen at the txv, or txv issue.
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    Shut down the pump, go to the highest point on...

    Shut down the pump, go to the highest point on the loop, bleed air. Start the pump for a few minutes, shut it down, rinse and repeat.

    Basically you have air in the system, but you can't get it...
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    Thats funny, I bet he about crapped his pants...

    Thats funny, I bet he about crapped his pants when that thing collapsed! Lol!
  9. Replies
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    Discussions like this help raise the trade as a...

    Discussions like this help raise the trade as a whole.
  10. Replies
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    The one that gets me is TXV valve.

    The one that gets me is TXV valve.
  11. Replies
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    1,686

    I've known worthless techs that can BS anyone,...

    I've known worthless techs that can BS anyone, while really good techs that can't express themselves professionally, are thought of as being idiots.

    Regardless of your skill level, a high level...
  12. Replies
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    Wayne does make a good point. I've always used...

    Wayne does make a good point. I've always used that as a gauge with techs also.

    If you're getting into commercial, its even more important to raise your level of professionalism. When you start...
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    Old instructor of mine was a residential guy. He...

    Old instructor of mine was a residential guy. He had a package unit mounted to a trailer. When he did change outs, he would drop it at the customer's house and flex duct it through windows, so they...
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    We have some job site heaters going now, GC...

    We have some job site heaters going now, GC ordered them. They are trailer mounted, diesel fuel powered. No emissions in heat stream, so safe for enclosed spaces.

    Can't get anything else, buy...
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    I'm leaning toward a motor problem....although...

    I'm leaning toward a motor problem....although I'm considering dropping a line into Jay's end of the pool. Only cause I would like to be a participant in one of those finds! LOL!!

    I would think...
  16. Thread: Oil Traps

    by 71CHOPS
    Replies
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    670

    ESHX works for a manufacturer, and gave you their...

    ESHX works for a manufacturer, and gave you their recommendations.

    As long as you're not exceeding the equivalent pipe length, it comes down to space or looks.

    The fact that the dupont...
  17. Thread: Oil Traps

    by 71CHOPS
    Replies
    17
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    670

    Hang out awhile before you jump to conclusions!

    Hang out awhile before you jump to conclusions!
  18. Thread: Oil Traps

    by 71CHOPS
    Replies
    17
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    670

    Visualize a pipe mounted vertically to a wall. ...

    Visualize a pipe mounted vertically to a wall. Then a P trap points left, then straight up. On top of that, you install 2 45's going right, then facing up.....this puts the top section of pupe...
  19. Thread: Oil Traps

    by 71CHOPS
    Replies
    17
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    670

    If you have enough piping that traps are...

    If you have enough piping that traps are necessary, I would be more concerned about adding equivalent pipe length by installing more fittings.

    If you're not exceeding the recommended pipe length....
  20. I just went through that emotional roller...

    I just went through that emotional roller coaster. I guess the advantage i had was that I had to get 22 years worth of crap into a 20' box trailer, then move 1200 miles across the country.

    The...
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    Could also be the return duct design causing...

    Could also be the return duct design causing turbulent or dead areas around the heat exchanger.....aka crappy design that needs a baffle or deflector near the limit.
  22. I just dumped 10 years worth of commercial parts....

    I just dumped 10 years worth of commercial parts. 3 garages full of everything from motors and speed drives, to controls and chiller parts, even had an 800 lb. Low pressure tank mounted recovery...
  23. look at the Dupont refrigeration piping hand...

    look at the Dupont refrigeration piping hand book.

    the reason trane doesn't talk about double risers is that (theoretically) 410A is 100% miscible with POE, so it doesn't require oil traps in...
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    so, why do you need that split?

    so, why do you need that split?
  25. If you already suspect equipment sizing issues,...

    If you already suspect equipment sizing issues, you might want to reevaluate your design.

    I would install a dual circuit unit, which will allow for a back up system, and be closer to actual size.
  26. Replies
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    looking for: pipe threading...

    looking for:

    pipe threading equipment....preferably something like a 300 that can take a grooving machine also.

    oil pumps

    liquid refrigerant pumps

    large recovery and vacuum equipment
  27. Replies
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    whenever I have an intermittent oddball issue,...

    whenever I have an intermittent oddball issue, the very first step I take is to tighten every single electrical connection, and do the tug test on all wires to make sure they're seated.
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    I've had several ground source systems, but they...

    I've had several ground source systems, but they were all closed loop. They pumped glycol through the ground with another heat exchanger between that and the building loop.

    An open ground loop...
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    Could use a refrigeration condenser.

    Could use a refrigeration condenser.
  30. Replies
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    Find the unit operating charge for the condenser...

    Find the unit operating charge for the condenser and whatever length of lineset that will work with. Calculate the total charge for any additional line set, and thats the system field charge.

    If...
  31. You can, if you follow the manufacturer's...

    You can, if you follow the manufacturer's guidelines. Trane centrifugals come to mind.
  32. Do a search in pros commercial, we had a...

    Do a search in pros commercial, we had a discussion a year or so ago, and someone posted the copeland literature on them.
  33. If your meter reads into the mega ohm range. It...

    If your meter reads into the mega ohm range. It will show resistance to ground.

    I use 1,000 ohms per volt. So a 480 volt motor should be above 480,000 ohms (48M). But that is just a rule of...
  34. A megger is an invaluable tool.....if you...

    A megger is an invaluable tool.....if you understand what its telling you.

    Goole search "a stitch in time", published by Megger. That document pretty much explains everything you ever wanted to...
  35. I used to have a site with "dead leg" 480v......B...

    I used to have a site with "dead leg" 480v......B phase to ground was zero potential. No one could explain it to me, so I started researching power generation and transmission. Finally found out...
  36. the basics of AC started with Willis Carrier. ...

    the basics of AC started with Willis Carrier. He invented the psychrometric chart, and laid out all the properties of air. I read the story years ago about why 55* ended up being the standard...
  37. I can't find my book right now......if you really...

    I can't find my book right now......if you really want to understand transformer theory, start looking at some material regarding utility power generation transformers.

    there are some great basic...
  38. Replies
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    I just visited a state facility. they recently...

    I just visited a state facility. they recently switched to all merv 13, no thoughts towards equipment, just "we need better filters for covid".....morons.
  39. Looks to me like they expect the discharge air...

    Looks to me like they expect the discharge air temp. To match the thermostat reading.
  40. Replies
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    yeah, the coremax fittings are used for charging...

    yeah, the coremax fittings are used for charging by the factory, as CC said, there should be another suction port.
  41. Replies
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    interesting, I wonder if the motor/sensor is...

    interesting, I wonder if the motor/sensor is correct for the unit? could be the wrong one for that exact model.

    Also, might wanna check the parts lists, it's possible that there should be an...
  42. can you even buy separate parts (motor/module)...

    can you even buy separate parts (motor/module) for those?

    I always figured it would be all or nothing.
  43. Thread: York Rtu

    by 71CHOPS
    Replies
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    1,420

    Sign up for PRO membership.

    Sign up for PRO membership.
  44. Replies
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    Good deal, being open and honest about your work...

    Good deal, being open and honest about your work is the best way to work!

    I don't pay much attention to subcooling on an industrial refrigeration system....especially with receivers.

    I...
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    LOL! No biggie man, I've been there too.

    LOL! No biggie man, I've been there too.
  46. Replies
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    I've seen vapor lock on refrigeration skids with...

    I've seen vapor lock on refrigeration skids with liquid refrigerant pumps, but that was due to the lack of pressure differential in the vessels...well, some other issues also...

    Anyway, with 40%...
  47. Replies
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    you'll likely just have to play with it. you...

    you'll likely just have to play with it.

    you should be able to get into the PID loop adjustments...they may or may not be using the Derivative....prolly not.

    you can also change the number of...
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    I don't do rack work, but If that were me, I...

    I don't do rack work, but If that were me, I would suspect the system is low on charge.

    do supermarket racks use liquid refrigerant pumps to circulate to the cases?
  49. Replies
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    yeah, it's actually quite impressive what an ABB...

    yeah, it's actually quite impressive what an ABB (and others) can do as a stand alone "controller".....we never really even scratch the surface of what can be accomplished with one.
  50. So do you guys condemn heat exchangers strictly...

    So do you guys condemn heat exchangers strictly on combustion analysis, or do you use that as the first step, then do a visual to confirm?
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