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  1. I hope you don't have a direct radiant path,...

    I hope you don't have a direct radiant path, because it will never read the correct ambient under static conditions. The sensor will get heated by the sun during the day and read way high. You won't...
  2. Dew and frost on things overnight is a different...

    Dew and frost on things overnight is a different phenomena. Night sky is in subzero range and it is like a cooling panel, so things can cool down below ambient which is why its possible to get frost...
  3. Without air, there will be no "relative"...

    Without air, there will be no "relative" pressure. it will always be at full saturation as long as long as there's liquid phase remaining.

    So for practical purpose, thinking air as the solvent...
  4. Do you have rest of the data?

    Do you have rest of the data?
  5. Cultural change making CRAC/precision cooling obsolete

    A BTU is a BTU regardless of temperature. A 1,000W worklight (~3,400 BTU) gives off the same heat as 1,000W of IT equipment, but the IT equipment's lower tolerance for temperature requires more...
  6. You guys are over thinking it. It's easier to...

    You guys are over thinking it.
    It's easier to visualize using liquid and solids, because you can see it.

    Dissolve as much sugar as you can in a jar at 140F and skim the liquid layer into...
  7. Describe how the needle moves. Jumpy, abrupt, or...

    Describe how the needle moves. Jumpy, abrupt, or sweeping smooth and steady between 300 and 500? I know many have switched to digital, but you should always have a set of analog unless the digital...
  8. Came across this online. Not sold for this...

    Came across this online. Not sold for this purpose, but could work.

    Probably not too hard to rig up 1/4" ice maker line to fill up the tank from a faucet somewhere.
    It's $1,500. It's a gas...
  9. Replies
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    It sounds like you're their promo agent or a...

    It sounds like you're their promo agent or a sales rep. R-421A is nearly identical to Nu422B sans the 3% 600a, and online literature suggests it is similar to automotive 12->134a retrofit kit which...
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    http://www.achrnews.com/articles/108910-ice-breake...

    http://www.achrnews.com/articles/108910-ice-breaker-refrigerant-numbering-system-explained

    The A, B, C. .. uppercase suffix is in chronological order. ...
  11. Replies
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    1,686

    Where on earth did you come up with this? The...

    Where on earth did you come up with this? The uppercase suffix is used to indicates different ratio versions of refrigerants with same components in the order they were added to ASHRAE registry. ...
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    It's kind of the same question as Can you put...

    It's kind of the same question as
    Can you put install a mini-split with the condensing unit in the living room to cool a bedroom?

    There's that part of code that says "installed per the...
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    All condensers on cars are aluminum microchannel...

    All condensers on cars are aluminum microchannel and it is exposed to the elements before the radiator. Sometimes you'll lose a condenser when a rock hits just the right part but they're constantly...
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    Something seemed off about your posts and I feel...

    Something seemed off about your posts and I feel more confident about my hunch.

    You can get a heat exchanging air exchanger which lets you bring in outside air and cool it/dehumidify it using the...
  15. It says it can be repeatedly bent without work...

    It says it can be repeatedly bent without work hardening. I wonder if they mean flexible enough to be bent on a regular basis. I wouldn't mind having a portable AC unit a detachable fan coil unit.
  16. The metal jacket has the same purpose as the...

    The metal jacket has the same purpose as the cords in tires. If you didn't have the jacket the hose would inflate like an inner tube. When you have that much refrigerant behind the case it's a good...
  17. Perhaps the installation practice or usage...

    Perhaps the installation practice or usage violated minimum radius specs and the metal core snapped. You know the leaf springs on your truck can bend repeatedly with no limit on how many times they...
  18. Hang onto your old ones with high quality valve...

    Hang onto your old ones with high quality valve body. I'm quite disappointed with the crap valves you see on some digital gauges out there. Some are basically digital module bolted onto the same...
  19. Have one analog with 410A gauges and one digital....

    Have one analog with 410A gauges and one digital. Analogs are superior for getting a snapshot of what the system is doing and digitals are better for getting exact measurements.

    Digitals can quit...
  20. I don't really have suggestions on the...

    I don't really have suggestions on the instrumentation part, but it's the mechanical parts where quality really counts. I recommend Imperial brand diaphragm manifold for vacuum work. I have their...
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    Yep, if you're somewhere geographically proper to...

    Yep, if you're somewhere geographically proper to benefit from additional dehumidification capacity. You'll probably hear from a dehumidifier sales guy here soon.
  22. Replies
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    You can't consider that a failure within normal...

    You can't consider that a failure within normal usage. if you wrap a penny in aluminum foil and put it in salt water, the foil will corrode away. For this reason the common aluminum fin on copper...
  23. Any idea what the hose is made from under the...

    Any idea what the hose is made from under the sheath? Every refrigerant gas has a different leakage character unless the inner core is corrugated metal. It seeps through the same way balloons shrink...
  24. That depends on where you're at. Inches of...

    That depends on where you're at. Inches of mercury is a relative unit and it is backward. It's an archaic measurement that's still used because of traditions. Zero micron is 23-24" Hg in not some...
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    There are two many situations to count when you...

    There are two many situations to count when you could use 2-3 meters. A phase rotation that strictly does just that will take up space in your bag and it's just dead weight if you don't use it all...
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    Well put it this way. The acidity can be bad...

    Well put it this way. The acidity can be bad enough for there to be a safety warning about chemical burns from burnout oil. The stuff that forms is HF which even eats glass. One of the most dangerous...
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    Clear the cache.

    Clear the cache.
  28. Replies
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    1,393

    wow the like button worked for the first time for...

    wow the like button worked for the first time for me
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    is this a pumped refrigerant economizer? ...

    is this a pumped refrigerant economizer?

    http://www.cfroundtable.org/pdf/101615/Emerson-Pumped-Refrigerant-Economization-Title-24.pdf


    If you've got two ref. jugs linked up by a vapor pipe...
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    This is perhaps one of the worst thing to try out...

    This is perhaps one of the worst thing to try out of all the hack techniques out there. An empty 410A jug weighs about 8 lbs and a 22 jug weighs about 5 lbs and they're about the same size. guess...
  31. I have no clue how to install anything in Linux....

    I have no clue how to install anything in Linux. It's not easy to configure for me. Adding apps within Linux seems to be a steep learning curve. I just downloaded a bootable bundle and burned it on a...
  32. Economics of refrigerant heat pump is entirely...

    Economics of refrigerant heat pump is entirely dependent on your climate as well as utility situations. Your friend two miles down the road outside of natural gas service might have a lot of nice...
  33. Thread: 3 phase help?

    by ICanHas
    Replies
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    487

    The official voltages are 120, 208 and 240 which...

    The official voltages are 120, 208 and 240 which corresponds to adjusted values 115, 200 and 230, but it's common to see 208 expressed as 208. A 208v service running towards the top end allowance and...
  34. Thread: 3 phase help?

    by ICanHas
    Replies
    9
    Views
    487

    See the note on 1/1.73 relationship instead of...

    See the note on 1/1.73 relationship instead of 1/2? Wye system is convenient for serving a lot of 120v loads while providing light three phase equipment from the same service. For wye to work, it's...
  35. Thread: 3 phase help?

    by ICanHas
    Replies
    9
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    487

    You can't have both 240 and 120 from the same...

    You can't have both 240 and 120 from the same wye. A 240 wye would get you 138v to ground. The reason we have the peculiar 208v is so that standard 120v is available for outlets.
  36. I am surfing here with Linux operating system

    On my old crappy mini laptop using two flash drives.
    One for booting up and other for saving stuff onto.

    Not too bad for browsing the web.
  37. Thread: 3 phase help?

    by ICanHas
    Replies
    9
    Views
    487

    Wye would be 208 between any two legs and 120v to...

    Wye would be 208 between any two legs and 120v to ground.
    The 240/120 is more consistent with a delta system however you would generally read 240 between poles and either 120, 120, 208 with a high...
  38. Anything WiFi linked (Internet of Things) is...

    Anything WiFi linked (Internet of Things) is scary, because they're an embedded system. Many of today's embedded spyware calls home regularly and factory often have the power to tamper with the...
  39. Please provide the outdoor temperature, indoor...

    Please provide the outdoor temperature, indoor temperature+wet bulb, refrigerant pressures and corresponding saturated temperatures and measured line temperatures
  40. Replies
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    Cold air is dense and tends to pool near the...

    Cold air is dense and tends to pool near the floor level. Get a CO2 filled balloon and a helium filled balloon. The CO2 balloon will fall down to the floor and linger on the floor. Helium balloon...
  41. If the roof is fairly easy for teens to access,...

    If the roof is fairly easy for teens to access, have them install tamper resistant caps. Refrigerant shrinkage due to huffing causes very frustrating leak search effort so being able to detect that...
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    Sales pitch and theory are cheap. We assume ideal...

    Sales pitch and theory are cheap. We assume ideal conditions in classrooms to learn the theory. A simple "+/- 0.5C" can mean so many things. Some brands are a lot more conservative. China made goods...
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    are you mikey poodle head's boy?

    are you mikey poodle head's boy?
  44. I have to agree with FrostyRyan. The compressor...

    I have to agree with FrostyRyan. The compressor and condenser fan are coil and core and they're usually not even connected electrically to rest of the HVAC system. The condensing unit is like an...
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    It's basically a heavier duty version of mylar...

    It's basically a heavier duty version of mylar party balloon.
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    Forgive me for posting in this old thread.. what...

    Forgive me for posting in this old thread.. what brought my attention back to them is seeing their December 2015 refrigerant application in ASHRAE application list with pending designation of R-458A...
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    Speaking of 1234yf, it's A2L or slightly...

    Speaking of 1234yf, it's A2L or slightly flammable. Other than that, it behaves closer to R12 than R134a, and some cars like the newest Dodge RAM 1500 and Challenger use it.




    Transition from...
  48. RSD has a workshop on new refrigerants 4/27/16 in Los Angeles.. and in Montana in May

    I'm always referencing to Gary's "Changing State of refrigerants". I've never attended one in person, but I'm always reading their slides and find it useful.

    It's a constantly changing subject....
  49. Freon is coming back and we can proudly call it Freon again

    https://www.chemours.com/Refrigerants/en_US/
    All the ISCEON stuff has been renamed FREON. Look under products
  50. Replies
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    They've done goofed. Oopsie Catalog A-1 April...

    They've done goofed. Oopsie
    Catalog A-1 April 2015
    http://i.imgur.com/MfSSlRq.gif
    In US it holds a shy of pound, but in Europe the same thing holds 9.7 lbs of refrigerant.
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