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  1. 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:
    ...
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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...
  3. 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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    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...
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    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 ...
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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-!!
  10. 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...
  11. 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...
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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...
  13. 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
  14. 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
  15. 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...
  16. 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...
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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...
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    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...
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    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
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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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    That's a good point. I mentioned stranding of...

    That's a good point. I mentioned stranding of oil in the receiver with mixtures of mineral oil and POE, but I've read that stranding can happen with systems with very high oil circulation. The oil...
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    One circuit of a 40 hp condensing unit at -20F/...

    One circuit of a 40 hp condensing unit at -20F/ 95F ambient will do 81,510 Btuh. The 2 5/8"" suction line velocity would be 1481 FPM and the pressure drop over 100 ft would be 0.3 psi.

    One...
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    https://century-refrigeration.com/wp-content/uploa...

    https://century-refrigeration.com/wp-content/uploads/2017/05/NSB-404-507.pdf
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    Discharge on a condensing unit is factory piping...

    Discharge on a condensing unit is factory piping within the unit, not liquid and suction which are field piping.
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    I read that to mean liquid line and suction...

    I read that to mean liquid line and suction line.... 1 1/8" / 2 5/8"
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    Is there a possibility of this circuit's oil...

    Is there a possibility of this circuit's oil having a mix of mineral oil and as well as POE, such as if someone inadvertently added mineral oil instead of POE sometime during all of these service...
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    What you describe is not oil migration, it sounds...

    What you describe is not oil migration, it sounds to me to be oil loss...most likely from the multiple header failures. (I assume these were discharge header cracks.)

    What type of compressors and...
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    Most likely, if there is such a tool as you...

    Most likely, if there is such a tool as you describe, it's only made by Emerson and not available for resale.

    I've never had a need for one and if I had, the timely and least costly solution for...
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    I've done it on ocaission while waiting for the...

    I've done it on ocaission while waiting for the OEM temperature control and had no issues.

    The one thing I can say about it though, is as the box temperature drops, the compressor's going to see...
  30. Replies
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    I agree we fridgies tend not to pay much...

    I agree we fridgies tend not to pay much attention to subcooling, but there are times when it can be a valuable troubleshooting tool...and this is one of them.

    I see this thread as an example of...
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    Basically the effect of the mechanical subcooling...

    Basically the effect of the mechanical subcooling supplied to the case would have little to no difference in the required conditions at the case. The added subcooling is used for system capacity...
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    Tyler Refrigeration specified suction stop...

    Tyler Refrigeration specified suction stop solenoids for some of their cases with conventional or single compressors. They didn't result in floodback or slugging.

    If you think about it, during...
  33. Based on 3000 Btuh at -10F SST and 120F SCT...

    Based on 3000 Btuh at -10F SST and 120F SCT with R404A, a .052" ID x 95" cap tube with 36" of heat exchange length will work well.


    818884
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    You're correct to have heat exchange between the...

    You're correct to have heat exchange between the cap tube and suction line for the added subcooling, but for the wrong reasoning.

    The subcooling gained from this heat exchange doesn't increase the...
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    When there's a possibility of hydrostatic failure...

    When there's a possibility of hydrostatic failure of liquid line piping or component, it's common to install a differential pressure type relief valve. If there's a solenoid valve downstream of a...
  36. In the 50's and 60's my father kept a dozen or so...

    In the 50's and 60's my father kept a dozen or so spare motors on the shelf at the shop. They were 1/4 hp up to maybe 3 hp.
    Whenever a customer's motor died they were installed as "loaners" while...
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    What is the Tecumseh condensing unit's model...

    What is the Tecumseh condensing unit's model number?

    Go to Tecumseh Boxload page, select Condensing Unit Data Sheets and scroll down the dropdown menu to find the model. It'll give you what the...
  38. What is the model number of the existing...

    What is the model number of the existing compressor?
  39. Replies
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    If you think in terms of temperature instead of...

    If you think in terms of temperature instead of pressure, then it's much easier to estimate what the conditions should be regardless of what refrigerant you have.

    So the question should be: What...
  40. Thread: Suspicious

    by icemeister
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    Your link worked, but this one is more direct: ...

    Your link worked, but this one is more direct: https://icemeister.net/backroom/wp-content/uploads/2015/04/AndySchoen_A-Modern-Method-of-Properly-Sizing-Capillary-Tubes.pdf
  41. Thread: Suspicious

    by icemeister
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    I haven't written a cap tube article....yet. ;)

    I haven't written a cap tube article....yet. ;)
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    You are correct that in the real world the...

    You are correct that in the real world the condenser load would in fact be lower. However, in post #4 I first defined the conditions surrounding my imaginary system...one condition being that we'll...
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    The OP was asking how pressure loss in the...

    The OP was asking how pressure loss in the discharge line affects compressor capacity, so I set up an imaginary system to help explain it without getting into line sizing calculations. It just...
  44. When I was with a supermarket chain, during...

    When I was with a supermarket chain, during remodels we'd pull out perfectly good compressors that were 30 years old or more. They were Copeland, Dunham-Bush (semi-hermetic & belt drive) and even...
  45. Thread: Suspicious

    by icemeister
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    I got that yesterday as well. It's just a...

    I got that yesterday as well.

    It's just a notice from RSES about apparent phishing attempts reportedly received by some members. The email itself is clean.
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    Imagine this example: You have an ideal...

    Imagine this example:

    You have an ideal air-cooled system unit running at 200 psig at the compressor discharge and 200 psig at the condenser inlet. We'll assume the compressor load is constant as...
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    Your profile page may be found by clicking on...

    Your profile page may be found by clicking on either your username in any of your posts or the My Profile link at the top RH portion of any page on HVAC-Talk.com. Once at your profile page, click on...
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    You're on the right track, mi amigo. ;) Change...

    You're on the right track, mi amigo. ;)

    Change the refrigerant.

    That AJB2433 is a R404A LT compressor with a displacement of 26 cc. At -10F SST / 120F SCT is has a capacity of 3410 Btuh with...
  49. Sporlan's R410A ZGA and ZCP180 powerheads are...

    Sporlan's R410A ZGA and ZCP180 powerheads are rated for 40F, 20F and 0F
  50. Just for kicks, say the cheapest 1 ton R410A...

    Just for kicks, say the cheapest 1 ton R410A condensing unit you can find has a Copeland ZP16K6E-PFV scroll compressor. Go to the Copeland OPI page for this model and find that at 25F SST/110F...
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