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  1. 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...
  2. 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
  3. 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
  4. 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...
  5. 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...
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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...
  22. 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
  23. Replies
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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...
  25. 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...
  27. What is the model number of the existing...

    What is the model number of the existing compressor?
  28. 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...
  29. 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
  30. 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. ;)
  31. Replies
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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...
  33. 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...
  34. 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.
  35. Replies
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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...
  36. Replies
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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...
  37. Replies
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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...
  38. Sporlan's R410A ZGA and ZCP180 powerheads are...

    Sporlan's R410A ZGA and ZCP180 powerheads are rated for 40F, 20F and 0F
  39. 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...
  40. Replies
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    Either suction stub will work. They're simply...

    Either suction stub will work. They're simply stubbed into the shell so the refrigerant dumps directly into it.

    If I did anything with how you have it piped, I get rid of that tap valve and burn...
  41. Replies
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    The heat exchange length refers to the length of...

    The heat exchange length refers to the length of cap tube which is in contact with the suction line. This length, more specifically, would be equal for both the cap tube and the suction line as it...
  42. Replies
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    I used the Tecumseh Cap Tube Selection based on...

    I used the Tecumseh Cap Tube Selection based on the Embraco Toolbox app capacity of 630 Btuh at -13F evap temp and 113F condensing temperature. Using .026" as the cap tube ID I got 79" length is...
  43. Replies
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    This for a domestic refrigerator/freezer, so it's...

    This for a domestic refrigerator/freezer, so it's a low temp system that runs R134A at or slightly below 0 psig. The limiting factor then would be the AEV's operating range is typically 0-90 psig.
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    Will it work? Yes, it can work; but obviously,...

    Will it work? Yes, it can work; but obviously, the pulldown will be slower and it may not cut it in hot ambients.

    The cap tube will be need to be resized and replaced. Size the cap tube for...
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    Google the part #P5F5700100 and you'll find that...

    Google the part #P5F5700100 and you'll find that it's a Tecumseh CAJ2446Z (AJE2433Z)

    https://www.tecumseh.com/en/na/products/recip/aje2433zxa?fromSearch=1
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    That Heatcraft condensing unit is designed for...

    That Heatcraft condensing unit is designed for low temp operation only. (Read the post by idontgetit) It can be forced to cool the box and hold 35F, but it would be slowly kill the compressor. Tell...
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    Northstar recommends starting at 100-200 ppm and...

    Northstar recommends starting at 100-200 ppm and then adjust the feed rate of your salt feeder to get the best ice removal from the drum.

    817695
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    Fasco's Fast Facts brochure is a good resource to...

    Fasco's Fast Facts brochure is a good resource to have for motor information. See p.19-20 where it talks about oversized motors:
    ...
  49. The general rule, "compressor superheat trumps...

    The general rule, "compressor superheat trumps evaporator superheat", is a good one to follow, however it should be applied after adjusting the TXV to the the proper superheat for the application,...
  50. That's the approach I would take, except I would...

    That's the approach I would take, except I would be also take a closer look a that Parker CE-AA-VW TEV for use with R404A. I agree the thermostatic element must be changed to an "S" charge, but it's...
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