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  1. Replies
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    The trap is for oil, not condensed liquid.

    The trap is for oil, not condensed liquid.
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    The trapped line is a discharge line so the trap...

    The trapped line is a discharge line so the trap makes sense.

    The insulated line must be subcooled liquid, hence the need for insulation.

    My guess is the discharge line goes to an...
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    That's not my photo, but I have one just like it...

    That's not my photo, but I have one just like it that I bought from a local supply house. I also have a R134A for the car. (I sold the car but still have the FREON ;) )

    They have a different...
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    https://external-content.duckduckgo.com/iu/?u=http...

    https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Ftse4.mm.bing.net%2Fth%3Fid%3DOIP.N0dfDqTBE82TSAdKQ0Eq5gHaJ4%26pid%3DApi&f=1
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    걱정 하지마 친구

    걱정 하지마 친구
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    75F / 55% RH

    75F / 55% RH
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    That first unit I installed had the optional...

    That first unit I installed had the optional "Orbus" variable speed condenser fan which I sold the customer on for its "energy saving" features. The pressure transducer failed twice within two...
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    I installed my first one in 2009. The only info...

    I installed my first one in 2009. The only info we had back then was this which is buried in the Literature section under Miscellaneous: http://www.heatcraftrpd.com/PDF/Misc/H-HTS-QA.pdf

    It only...
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    If you look at the wall thickness for 3/8"...

    If you look at the wall thickness for 3/8" through 5/8" in the Sporlan 90-30-1 Table 1, they're basically linear...ie, .016", .017", .018". You might assume then that the wall thickness for .1/4" OD...
  10. I hadn't really considered the low side. The...

    I hadn't really considered the low side. The R410A evap coils can have some pretty small tubing. Good point.
  11. The mass flow increase for R404A is irrelevant...

    The mass flow increase for R404A is irrelevant when the resulting EER (Btu/kw) numbers are as good as those for R410A.
  12. To check the claim that R404A is not efficient at...

    To check the claim that R404A is not efficient at higher evaporator temperatures I made a comparison of two Copeland scrolls at 45F SST and 130F SCT with oF liquid subcooling. One is the...
  13. Heatcraft rates all of their medium temperature...

    Heatcraft rates all of their medium temperature scroll units up to 40F evaporator temperature and Copeland rates the ZS scroll compressor up to 45F evap temp for R404A. I see no problem using them...
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    Looking at the picture, it appears that the nylon...

    Looking at the picture, it appears that the nylon cam is worn causing the door to sag. It's a very common issue for older doors.

    If it's a Kason 1256, this is the part:...
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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...
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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.
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    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.
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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
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    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...
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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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    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): ...
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    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.
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    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...
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    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.
  25. 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...
  26. 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...
  27. 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...
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    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,...
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    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...
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    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...
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    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 ...
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    No...not yet anyway. ;) I just heard from Andy...

    No...not yet anyway. ;) I just heard from Andy yesterday.
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    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
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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!
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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...
  36. Replies
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    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...
  37. 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...
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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...
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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...
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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.
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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...
  42. 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/
  43. 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...
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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.
    ...
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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:
    ...
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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...
  47. Thread: one drive??

    by icemeister
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    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/
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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...
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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...
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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?
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