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  1. Replies
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    This is basically a classic two-stage cascade...

    This is basically a classic two-stage cascade system. If your low stage condenser is running at 130F saturated condensing temperature, you would typically have about a 10F TD between the...
  2. From my experience living and working in Florida,...

    From my experience living and working in Florida, the humidity is oppressive, especially in the summer when it's common to have dewpoints of 80F or more. Poorly installed Armaflex will get...
  3. Thread: Impossible?

    by icemeister
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    359

    Use a standard low-profile unit cooler (like a...

    Use a standard low-profile unit cooler (like a Bohn ADT) sized for an 8F TD and add a fan speed controller, essentially creating a variable capacity evaporator to allow adjusting of the evaporator...
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    I believe you're over-thinking this and panicking...

    I believe you're over-thinking this and panicking unnecessarily over the cold startup and subsequent shutdown on internal overload.

    Copeland's Application Engineering Bulletin AE4-1331 R8 which...
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    If this buildup were caused by infiltration I...

    If this buildup were caused by infiltration I would expect to see more of the light and fluffy type of frost commonly known as hoar frost. This looks to me to be a defrost issue, possibly steaming...
  6. Thread: Penn tstat

    by icemeister
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    570

    It would be helpful to know how the thermostat...

    It would be helpful to know how the thermostat failed. By that I mean did its setting drift from -20F to +32F which would indicate a loss of charge in the sensing element or were the output...
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    To raise the %RH in a walk-in cooler you need to...

    To raise the %RH in a walk-in cooler you need to have a lower design TD. An 8F TD for example will result in around 90-95%RH.

    If you have a conventional single compressor/single evaporator...
  8. LG Panasonic

    LG
    Panasonic
  9. Replies
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    Basically anything that has prevented the ice...

    Basically anything that has prevented the ice from completely clearing away from the evaporator.

    This would include, but not limited to, scale buildup, low water flow during harvest and/or tube...
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    Systems with partially blocked capillary tubes...

    Systems with partially blocked capillary tubes are often misdiagnosed as having a leak. They see low suction and believe it must be due to a leak. The one place in a leak-free system with moisture...
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    895

    Scroll compressors will tolerate intermittent...

    Scroll compressors will tolerate intermittent slugs and floodback, but like any compressor they cannot handle sustained floodback causing oil dilution and subsequent loss of lubrication.

    My first...
  12. Replies
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    1,150

    If you want to get really nit-picky, temperature...

    If you want to get really nit-picky, temperature in Kelvin isn't expressed in degrees at all, even though a Kelvin unit or "degree" is equal to a Celsius "degree". According to the National...
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    We need more information about the system and...

    We need more information about the system and what it's designed to do before we can give you any real help with this.

    What type of system is this/ Comfort cooling? Process cooling?...
  14. Replies
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    and raise your suction pressure

    and raise your suction pressure
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    649

    What type of fruit is being ripened? Bananas for...

    What type of fruit is being ripened? Bananas for example need to be ripened at 58F-60F and at a high humidity of about 90%-95% RH which can be maintained naturally if your evaporator coil is...
  16. The inspectors I dealt with in Florida had their...

    The inspectors I dealt with in Florida had their laptops, a flashlight and sometimes a small mirror. I figured that one day they'd be issued a screwdriver and we'd suddenly be very busy. ;)
  17. Replies
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    This is a chart from the Ritchie (Yellow Jacket)...

    This is a chart from the Ritchie (Yellow Jacket) catalog showing the weight (per foot) of liquid in their hoses. The top line is their standard service hose:

    813455

    So a typical 6 ft hose will...
  18. Replies
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    1,295

    It's been a long time since I've even seen an...

    It's been a long time since I've even seen an actual catalog.
  19. Replies
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    1,295

    Be aware that the ratio I'm using here is just a...

    Be aware that the ratio I'm using here is just a relative volumetric size comparison between two compressor and nothing to do with a % capacity loss between R22 and R404A. If you had performance...
  20. Replies
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    1,295

    As an employer, he wants to know if you have an...

    As an employer, he wants to know if you have an EPA card so you can pick up refrigerant at the supply house. That's all.

    That the new guy didn't know the ropes is precisely why you were training...
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    1,295

    If that letter indicates that you passed, then...

    If that letter indicates that you passed, then that would suffice. Doesn't your supply house have a copy of your EPA card on file?

    As for the manufacturer certs, they would be OK but I prefer to...
  22. Replies
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    1,295

    It's quite possible this was never a freezer. ...

    It's quite possible this was never a freezer. Many beer coolers are designed to run at a temperature like 32F which would require electric defrost.
  23. Replies
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    If the compressor you have isn't rated for R404A:...

    If the compressor you have isn't rated for R404A:

    1. Look at the physical specs for the compressor model you have and find the cu ft/hr (CFH) displacement. In this case, the CR24K6E-PFV has a...
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    To apply for Pro status here on HVAC-Talk the...

    To apply for Pro status here on HVAC-Talk the most common document used to prove you're an HVACR professional is the EPA card. Take a pic of yours and submit it with your application, which you'll...
  25. Thread: Attachment

    by icemeister
    Replies
    2
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    386

    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
  28. Thread: delta T

    by icemeister
    Replies
    12
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    847

    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...
  29. Thread: delta T

    by icemeister
    Replies
    12
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    847

    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...
  30. 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...
  31. 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,...
  32. Endeavor Business Media's website: ...

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

    It says they're based in Nashville, TN
  33. 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
  34. 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...
  35. 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.
    ...
  36. 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 . ...
  37. 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...
  38. 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. ;)
  39. 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...
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    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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    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...
  42. Replies
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    1,568

    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:
  43. Replies
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    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...
  46. Thread: Signature

    by icemeister
    Replies
    22
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    3,409

    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: ...
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    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...
  48. Thread: Signature

    by icemeister
    Replies
    22
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    3,409

    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. ...
  49. Replies
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    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...
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    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...
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