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  1. Thread: Attachment

    by icemeister
    Replies
    2
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    195

    When you log in to HVAC-Talk using a cell phone...

    When you log in to HVAC-Talk using a cell phone (without a Tap-a-Talk account) you're automatically switched to vBulletin's Mobile mode. You can't attach files and images in Mobile, so need to...
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    Since you can't ID which refrigerant is in there,...

    Since you can't ID which refrigerant is in there, you must recover and charge with the best replacement option, which in this case would be R134A. As mentioned, a close-coupled system (especially...
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    Copeland AE4-1327 Economized Vapor Injection...

    Copeland AE4-1327 Economized Vapor Injection (EVI) for ZF*KVE and ZF*K5ECompressors:

    https://opi.emersonclimate.com/CPID/GRAPHICS/Types/AEB/ae1327.pdf
  4. Thread: delta T

    by icemeister
    Replies
    12
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    522

    The TD being greater for the condenser than the...

    The TD being greater for the condenser than the evaporator may hold true for the typical commercial refrigeration system such as a walk-in cooler which may have a 20-30F TD and the evaporator only...
  5. Thread: delta T

    by icemeister
    Replies
    12
    Views
    522

    Are you referring to the Delta T (ΔT) or the TD? ...

    Are you referring to the Delta T (ΔT) or the TD?

    Where:

    The ΔT of the condenser or evaporator is the temperature difference between the entering and leaving air.

    The TD of the condenser...
  6. To change your username, scroll down to the...

    To change your username, scroll down to the bottom of the page and click on Contact Us.

    That will allow you to send a message directly to the site administrator (Dad) who does all those types of...
  7. I've followed up behind numerous others who...

    I've followed up behind numerous others who obviously had little refrigeration experience and who had severely overcharged the system with results just as you describe.

    On one such occasion,...
  8. Endeavor Business Media's website: ...

    Endeavor Business Media's website: https://www.endeavorbusinessmedia.com/

    It says they're based in Nashville, TN
  9. According to the Metrex catalog sheets I'm...

    According to the Metrex catalog sheets I'm looking at, yes.

    https://docs.google.com/viewer?url=https%3A%2F%2Fwww.metrexvalve.com%2Fuploads%2Ffiles%2Fwccw65.pdf
  10. I can't ID the water regulating valve from the...

    I can't ID the water regulating valve from the pictures. It doesn't look like a Johnson/Penn V46 or a Danfoss, although it resembles a Metrex with that adjuster wheel in the last pic.

    My best...
  11. Copeland (USA) doesn't have a body cooling fan...

    Copeland (USA) doesn't have a body cooling fan kit for the K-body, however they do offer one in Europe for their DK-body Copelametic which is the same compressor.
    ...
  12. Replies
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    According to the Goodman long lineset capacity...

    According to the Goodman long lineset capacity loss chart for a 3-ton R410A unit, if the entire 50 ft run is 3/4" the capacity multiplier would be .93 and if it's 7/8" the multiplier would be .98 . ...
  13. If you can't do the water coil, then add the body...

    If you can't do the water coil, then add the body cooling fan. If they refuse that, just tell them the compressor manufacturer requires it. If the condensing unit is a Copeland, it originally had...
  14. As long as the copper tubing fits fairly snug I...

    As long as the copper tubing fits fairly snug I see no problem with adding the water loop in the field. The alternative would be to simply add a 9W fan to blow air across the body. ;)
  15. The model designation KAKA in the posted pic...

    The model designation KAKA in the posted pic indicates an air-cooled Copelametic compressor, whereas a water-cooled version of this same compressor would be a KWKA.

    Per Copeland, an air-cooled...
  16. Replies
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    606

    Temperature control and/or temperature monitoring...

    Temperature control and/or temperature monitoring by the supply air (commonly called Discharge Air (DA) is used quite often in supermarket cases. You'll likely find it more with cases operating with...
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    1,274

    No, I've never seen one either, but I noticed...

    No, I've never seen one either, but I noticed that Meuller was making them a while back when someone else on here was looking for 3-way valves. I seem to recall seeing a Sporlan modulating three-way...
  18. Replies
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    1,274

    The OP has a previous thread about his "chest...

    The OP has a previous thread about his "chest freezer": https://hvac-talk.com/vbb/showthread.php?2211340-Refrigeration

    It's 15 ft x 15 ft x 5 ft high. :eek:
  19. Replies
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    1,274

    What you're looking for is a full-ported,...

    What you're looking for is a full-ported, three-way refrigeration ball valve...like this:

    http://muellerrefrigeration.com/images/made/uploads/AU17865_160_118_75_c1.jpg
    ...
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    The BQ AAA cartridge should work well. If you go...

    The BQ AAA cartridge should work well. If you go to Bulletin 10-10 and do the recommended selection procedure you'll find the corrected capacity is often higher than the nominal capacity of the...
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    Tapatalk makes it easy to upload an image or file...

    Tapatalk makes it easy to upload an image or file from your phone. They have an upload box directly below where you type in your message, so all you need to do is can copy and paste.

    If you're...
  22. Thread: Signature

    by icemeister
    Replies
    20
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    2,941

    Oops!....I just noticed you're a Regular Member. ...

    Oops!....I just noticed you're a Regular Member. To have the ability to add a Signature you need to have Pro Member status.

    Go here to apply for Pro: ...
  23. Replies
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    679

    As I explained earlier, the envelope defines the...

    As I explained earlier, the envelope defines the limits of normal operation. Conditions outside these limits are considered as potentially damaging and/or unsafe, so protective devices are required...
  24. Thread: Signature

    by icemeister
    Replies
    20
    Views
    2,941

    Since you're using a cell phone, the site senses...

    Since you're using a cell phone, the site senses that and switches from Full Site Mode to Mobile mode. Some regular features like editing your profile to add a Signature aren't available in Mobile. ...
  25. Replies
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    679

    The operating envelope defines the limits of...

    The operating envelope defines the limits of normal operation as determined by the compressor manufacturer.

    The compressor's thermal/overload protection is designed to protect the motor from...
  26. Replies
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    679

    The system components you select should have the...

    The system components you select should have the information you're looking for listed on their data plate. For example, Copeland's condensing units usually include "Max Fuse" as the Maxiumum...
  27. Replies
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    Copeland's Electrical Handbook has a section...

    Copeland's Electrical Handbook has a section defining fuse sizing:

    812644
  28. Replies
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    528

    To get decent search results on this site I...

    To get decent search results on this site I always use the advanced search, which is in the second blue navigation bar (under the logo). The advanced search has two tabs, one for single content type...
  29. Traditionally (prior to high-glide blends) when...

    Traditionally (prior to high-glide blends) when selecting our system components, we simply used the saturated temperature of the refrigerant at the evaporator and at the compressor suction &...
  30. The top chart on p.12 is dealing with net...

    The top chart on p.12 is dealing with net refrigerating effect (NRE) in terms of Btu/lbm where you'll see that R404A is the lowest, however the next chart deals with the mass flow per ton where R404A...
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    It's true that back in the early days a POE oil...

    It's true that back in the early days a POE oil being used in HVACR there was a strict warning from OEMs to use a dedicated manifold gauge set for POE systems. This rule, along with the one for 5%...
  32. Replies
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    518

    I used the NuCalgon silicon spray: ...

    I used the NuCalgon silicon spray: http://www.nucalgon.com/products/aerosols/lubricants/food-grade-silicone
  33. Replies
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    518

    The air pocket you describe is formed during...

    The air pocket you describe is formed during harvest when the ice is melted away from the back side of the ice sheet.. The longer the harvest time, the more ice is melted away.

    As UmmScott said,...
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    Next time, using your iPhone's image app, crop...

    Next time, using your iPhone's image app, crop the picture just a little, save it and then upload it your post.
  35. Replies
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    The B-Series air-cooled machines have a fan cycle...

    The B-Series air-cooled machines have a fan cycle pressure control which cuts out at 200 psig and in at 250 psig. So the fan will usually cycle off if the machine is in a normal room temperature...
  36. Replies
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    You have it correct...Top Notch mean excellent or...

    You have it correct...Top Notch mean excellent or best. So thank you. :)



    That's a good question. I think in practice the error created by not taking pressure drop into account is...
  37. Replies
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    First, thanks for posting this in Imperial units....

    First, thanks for posting this in Imperial units. It's so much easier for us metrically-challenged Yanks. ;)

    The suction line pressure drop should always be taken into consideration when...
  38. You would need to know the entering wet bulb...

    You would need to know the entering wet bulb temperature of the air as well as the design specifics of the coil (size, rows deep, # of tubes high, tube size, circuiting, etc) and then run it all...
  39. Replies
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    Does this "casting" look something like this? ...

    Does this "casting" look something like this?

    https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRqHIkZwTalGzCeZ4r7IIUn9o2Xabvij7TIq_X0cAKaEotTkUrZSQ&s
  40. Replies
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    Traditionally, low temperature condensers are...

    Traditionally, low temperature condensers are sized at a 10F TD to oversize them for the higher post-defrost load and for the higher efficiency form the lower condensing temperature.

    Your...
  41. Replies
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    Yes, decreasing the condenser TD is the same...

    Yes, decreasing the condenser TD is the same thing as oversizing the condenser.



    The TD is deceased to increase the condenser capacity.



    COP (Coefficient of Performance) is a way of...
  42. Replies
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    The short answer is that the condenser is...

    The short answer is that the condenser is typically selected at the normal design conditions for saturated suction and condensing temperatures (SST/SCT). The post-defrost pulldown is accounted for...
  43. Replies
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    Regardless of which defrosting method used, the...

    Regardless of which defrosting method used, the evaporator and all of its electrical would still need to be rated as "explosion proof". There are a number of different NFPA/NEC ratings for hazardous...
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    You could do that, but then the remaining...

    You could do that, but then the remaining compressors would need to run at a -18F suction temperature. That would require bigger compressors and more horsepower...ie, not a very efficient way to go.
  45. Replies
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    Do you mean use EPRs on the two medium...

    Do you mean use EPRs on the two medium temperature evaporators and eliminate the low stage compressor?
  46. Replies
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    923

    The discharge pressure of the low stage...

    The discharge pressure of the low stage compressor would be the same as the suction pressure of the high stage compressors. That's also called the interstage pressure.
  47. Replies
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    :ditto: A -40F box would require a design...

    :ditto:

    A -40F box would require a design evaporator temperature of around -50F. This would put this application outside the operating envelope of the standard Copeland Scroll compressor. ...
  48. Replies
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    923

    The diagram shows an accumulator marked "ACC"...

    The diagram shows an accumulator marked "ACC" upstream of the compressors.

    Floating suction? I dunno. I was thinking that 3-way valve might even be a hot gas bypass for capacity control on...
  49. Replies
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    QUOTE=crazzycajun;25789249]Icemeister it looks...

    QUOTE=crazzycajun;25789249]Icemeister it looks like a crappy way to control a satellite Or defrost if I’m reading this schematic right ( which I probably am not)[/QUOTE]

    Yes, that 3-way valve is...
  50. Replies
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    923

    The system is a compound two-stage rack. The two...

    The system is a compound two-stage rack. The two medium temp, high stage compressors are running at +14F SST and the low temp booster compressor is at -18F SST, discharging to the suction of the...
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