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  1. Replies
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    To me, their approach is much ado about nothing. ...

    To me, their approach is much ado about nothing. Your method is basic loop piping, which has proven to be both effective and economical.

    Depending on how they intend to control temperatures in...
  2. Replies
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    My guess is it's a Copeland ZF scroll...

    My guess is it's a Copeland ZF scroll short-cycling on the LP control on pumpdown.

    Very common issue easily fixed with a time delay relay.
  3. Replies
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    880

    The site wouldn't load for me at around 7 AM but...

    The site wouldn't load for me at around 7 AM but works fine now. I also experienced loading issues yesterday.
  4. Replies
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    It's a paper by Temprite discussing oil issues,...

    It's a paper by Temprite discussing oil issues, focusing on the high efficiency (99.997%) of coalescing type oil separators.

    https://www.temprite.com/downloads/oilCarryOverandSludge.pdf
  5. Replies
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    961

    Riser sizing is all about maintaining a minimum...

    Riser sizing is all about maintaining a minimum suction riser velocity of 1500 ft/min.

    Downsizing the riser isn't necessary in every case. You really need to check your riser velocity at design...
  6. Replies
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    When psecmsg said, "SH at the compressor trumps...

    When psecmsg said, "SH at the compressor trumps evaporator SH" it means that you adjust the evaporator superheat first (at 6-8F for a cooler) and then check the superheat at the compressor. If the...
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    961

    Whose manual is it? I think one of the best...

    Whose manual is it?

    I think one of the best manuals for system installation is Heatcraft's Refrigeration Systems Installation & Operation Manual (H-IM-64L): ...
  8. Replies
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    961

    If the system is set up properly with pumpdown...

    If the system is set up properly with pumpdown control, the possibility of migration would be eliminated.
  9. Replies
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    961

    Migration generally refers to the refrigerant's...

    Migration generally refers to the refrigerant's tendency to move due to temperature gradient...ie, hot to cold...more so than simply running downhill.

    The primary purpose of the inverted trap is...
  10. Replies
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    961

    The "middle" trap is known as an intermediate...

    The "middle" trap is known as an intermediate trap.

    More than one intermediate trap may be required for systems with a rise exceeding 30 ft.
  11. I played around with Copeland's PSS program and...

    I played around with Copeland's PSS program and found that the MRA2-050 at -20F SST/110F SCT with R502 the capacity is 15,000 Btuh. It also tells you that the refrigerant flow rate at that...
  12. I'm thinking if this system was originally R12,...

    I'm thinking if this system was originally R12, then to have the same capacity as the current MRA-0500 with R404A the original compressor must have been a much larger displacement 5 hp R12 low temp...
  13. Looking at the photo the oil separator appears to...

    Looking at the photo the oil separator appears to be a Temprite 500 series accessible impingement type, probably a model 504 (1⅛") or 505 (1⅜") depending on the connection size. The 500 separator...
  14. Replies
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    953

    The minimum number of posts is 15 to qualify for...

    The minimum number of posts is 15 to qualify for Pro Technical membership and 30 posts for Business & Marketing.

    It's true that they must be technical in nature HVAC-related. In addition,...
  15. Replies
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    579

    One thing I would be concerned about is how the...

    One thing I would be concerned about is how the insects are to be presented...ie, obviously they can't be spread out loosely on trays, exposed to fairly high air velocity. To successfully chill them...
  16. Replies
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    887

    If it would actually run at 20F evaporator...

    If it would actually run at 20F evaporator temperature the condensing temperature would increase around 6 deg F or so, but it depends on what you do with the cap tube.

    According to the Tecumseh...
  17. Replies
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    887

    The AKA4460YXA with R134A at 20F/120F has a...

    The AKA4460YXA with R134A at 20F/120F has a capacity of 3060 Btuh

    Using 40% loss converting from R404A to R134A I get these capacities for the R404A compressors you have:

    AKA9438ZXA 3750 Btuh ...
  18. Replies
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    No...not yet anyway. ;) I just heard from Andy...

    No...not yet anyway. ;) I just heard from Andy yesterday.
  19. Replies
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    7,078

    Fo those who are interested, I have saved the...

    Fo those who are interested, I have saved the ColdWar series here: https://icemeister.net/backroom/valves/sporlan/cold-wars
  20. Replies
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    Andy's working on a new website and has indicated...

    Andy's working on a new website and has indicated that he'll also be creating some new apps soon, so stay tuned!
  21. Replies
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    Mazak, Your Pro Membership application has been...

    Mazak,
    Your Pro Membership application has been received and all looks good. Well done!
    I will send it out to The Committee for a vote later this morning, so I'll be back at you with the results...
  22. Replies
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    751

    masak, I haven't received an application from...

    masak,

    I haven't received an application from you. However, recently I received documents with no accompanying application.

    You should submit another application along with the required...
  23. Replies
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    Me too;) OK, I got that. In my...

    Me too;)



    OK, I got that.



    In my experience it's possible to have an evaporator superheat which is greater than the evaporator TD...ie, if you have a 35F box and 25F evaporator...
  24. Replies
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    Hey, sorry. I read it and thought I had replied....

    Hey, sorry. I read it and thought I had replied. It's possible I forgot to hit Submit. That kind of f-up happens more often than I'd like these days. ;)

    Climacheck isn't something I was aware...
  25. Replies
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    Sorry, but in my experience I have only used...

    Sorry, but in my experience I have only used Sporlan or Also (Emerson) expansion valves and neither of them use evaporator superheat as a parameter in valve selection. So when you ask about how...
  26. Replies
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    While I agree only an OEM trap will fit, but I've...

    While I agree only an OEM trap will fit, but I've seen cases where the drain was reduced to 1" to accomodate a running trap.
  27. Replies
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    Bob, you're mixing up you're terms and making a...

    Bob, you're mixing up you're terms and making a simple selection procedure much more difficult,

    The static superheat value has no relationship to the valve's rated capacity, so disregard it when...
  28. It's basically the same material as the pipe...

    It's basically the same material as the pipe insulation but it's in sheet form. Here's a link: https://www.armacell.us/products/aparmaflexaparmaflexfs/
  29. I haven't read his book, but I've watched most of...

    I haven't read his book, but I've watched most of his YouTube videos. He explains how we're being scammed through our health insurance and how their Medicare advantage and Supplement plans simply...
  30. Replies
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    I started a thread some time ago about how to...

    I started a thread some time ago about how to diagnose a cap tube system with what I call the Touchy Feely method, using only your sense of touch...ie, no tools.
    ...
  31. Replies
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    You can use the Tecumseh Cap tube app that I used...

    You can use the Tecumseh Cap tube app that I used and select .042", which is the closest size J.B has.
    Or you can use J.B.'s resizing chart to find the equivalent length of .042" cap tube:
    ...
  32. Replies
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    The standard box temperature for an ice...

    The standard box temperature for an ice merchandiser is 20F. I usually use a +10F evaporator temperature for these cap tube selections.

    The performance data sheet for a Tecumseh AEA4440 goes...
  33. Thread: one drive??

    by icemeister
    Replies
    3
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    1,602

    For a How-To guide to get rid of the OneDrive...

    For a How-To guide to get rid of the OneDrive popups go here: https://www.howtogeek.com/342550/get-rid-of-the-annoying-microsoft-onedrive-sign-in-popup/
  34. Replies
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    The 04 orifice looks good for a quick selection,...

    The 04 orifice looks good for a quick selection, but before finalizing your job planning it's always a good idea to do a longhand selection using the manufacturer's selection procedure. I've done a...
  35. Replies
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    E&E, the QR3-112 will work fine. I agree at 2C...

    E&E, the QR3-112 will work fine. I agree at 2C (35F) box temperature it will run a higher TD of about 8.2C (15F) as well as a higher capacity of about 7750 w. A TD of 8.2C (15F) is quite...
  36. Replies
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    Left-Handed Twist Ties

    Why is it in this right-hand dominant, righty-tighty / lefty-loosey world do I find so many twist ties that have been twisted on counter-clockwise?
    Is it because bakeries somehow attract lefties?
  37. Replies
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    Wow, I really messed up in my numbers above. ...

    Wow, I really messed up in my numbers above. :eek:
    I think I tripped interpreting my scribbled calculations likely due to my Metric disabilities.
    The last paragraph should read:

    The medium...
  38. Replies
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    950

    I can see that the original compressor and...

    I can see that the original compressor and evaporator would be a decent match at an evaporator temperature of approximately -23C (-10F). This was assuming the evaporator capacity of 5600 watts ...
  39. Replies
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    Dad summed up the history of HVAC-Talk and Snuffy...

    Dad summed up the history of HVAC-Talk and Snuffy here:
    https://hvac-talk.com/vbb/showthread.php?2214301-Sold-again-Welcome-to-Endeavor-Business-Media-!!
  40. One great thing about Packless is they will help...

    One great thing about Packless is they will help you with the proper selection of heat exchanger. So if you need a minimum of 20F superheat at the compressor, they can size it for you.

    They say...
  41. To have 3F superheat at the evaporator outlet...

    To have 3F superheat at the evaporator outlet and 0F superheat after the accumulator makes no sense, unless the accumulator is metering back some liquid from a recent liquid slug.

    What is the...
  42. Replies
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    I've seen combo cooler/freezer walk-ins where the...

    I've seen combo cooler/freezer walk-ins where the cooler had no floor and had 4" high floor screed sections to make up the difference.

    As crazzycajun suggested, contact the manufacturer and ask...
  43. Here's a good read from Fluke on HVAC motors...

    Here's a good read from Fluke on HVAC motors Insulation Resistance Testing (IRT):

    https://www.fluke.com/en/learn/blog/hvac/insulation-resistance-and-electrical-testing-for-hvac-compressor-motors
  44. I don't recall posting that video, but I do have...

    I don't recall posting that video, but I do have that publication by Megger:

    819495
  45. The refrigerant is a blend which probably...

    The refrigerant is a blend which probably contains R404A and several other components. Such refrigerants are typically proprietary so it is only available from its manufacturer.

    I suggest you...
  46. The nominal pressure drop for an expansion valve...

    The nominal pressure drop for an expansion valve isn't fixed at 100 psi. For R404A at 40F evaporator temperature it's 100 psi, but at 20F it's 125 psi and at -20F it's 150 psi. The temperature of...
  47. Replies
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    Scroll down the page to the capacity chart. I...

    Scroll down the page to the capacity chart. I selected -20F SST at 95F ambient. I notice now I got the NDB50 capacity wrong. I was in the wrong column. Oops!
    It should have been 217,094/2 or...
  48. Replies
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    1,879

    It's impossible to put numbers on something like...

    It's impossible to put numbers on something like this. That 5% number is just a typical oil circulation rate that I've seen used quite often when describing a pumper. Also higher compression ratios...
  49. Replies
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    1,879

    The unit in your pic shows a single wide NSB...

    The unit in your pic shows a single wide NSB model. The 50 hp unit is a double wide NDB, so there's plenty of room for two compressors.

    819375819376
  50. Replies
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    This isn't referring to the oil pump, but rather...

    This isn't referring to the oil pump, but rather it's about the amount of oil leaving the compressor due to worn rings, pistons and/or cylinders. The normal amount of oil leaving is about 1% whereas...
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