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  1. For any standard coil types you can get download...

    For any standard coil types you can get download a free coil selection program from just about any coil manufacturer. I have used Nationwide coils in the past for replacement coil with good results....
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    I think the key here is to do a detailed...

    I think the key here is to do a detailed calculation. Then show the engineer your numbers and say, "Where am I wrong?"
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    There are a couple of sound reason why Mexico...

    There are a couple of sound reason why Mexico doesn't appear to be hard hit with COVID-19.

    First, their first reported case didn't appear until about a month after the first reports in the US. ...
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    It's true. As trippintl0 said, the ZS low temp...

    It's true. As trippintl0 said, the ZS low temp scrolls can handle the amp load over a wide range of suction temps. It's true for the ZF series as well.

    It's also true that the condenser size...
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    Here's the MasterBilt walk-in manual (See...

    Here's the MasterBilt walk-in manual (See p.14-15): https://master-bilt.com/docs/default-source/specification-sheet/walk-ins-manual.pdf?sfvrsn=19

    You'll need some shims to put under the door to...
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    You must have missed the scrolling yellow banner...

    You must have missed the scrolling yellow banner notice at the top of the home page that Dad had up for weeks stating that all content would be lost forever when the switch is made back to the old...
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    Sorry....I had a brief BIden event. ;) The...

    Sorry....I had a brief BIden event. ;)

    The time delay would still be the way to go to eliminate the possibility of excessive short-cycling. If the Core Sense still trips at least you've...
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    I first started seeing this short-cycling on...

    I first started seeing this short-cycling on shutdown about 10 years ago with Copeland scrolls, both low and medium temp. typically it was just one or two quick re-cycles but sometimes I observed up...
  9. As explained earlier, frost doesn't always mean...

    As explained earlier, frost doesn't always mean floodback. Here's a pic of a supermarket rack with a measured 28F of suction superheat...ie, textbook normal conditions for the application:

    ...
  10. Good explanation, but you forgot to include the...

    Good explanation, but you forgot to include the evaporator TD.

    So assuming a -12F box temp and a 10F TD, the SST would be -22F.
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    Probably the most useful capability of the Supco...

    Probably the most useful capability of the Supco Balance Tester is you can install a new cap tube and test it to see if it properly balances with the compressor capacity. If the test pressure is too...
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    The cap tube balance tester is intended to be...

    The cap tube balance tester is intended to be used for testing the captube to see if it's partially plugged up, for testing the capacity of the cap tube compared to the capacity of the compressor as...
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    Burning HFC refrigerants cannot produce phosgene...

    Burning HFC refrigerants cannot produce phosgene because HFCs contain no chlorine, however they do contain fluorine and so produce hydrogen fluoride (hydrofluoric acid) which can be as bad or worse...
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    "Guests" include much more than just unregistered...

    "Guests" include much more than just unregistered members and lurkers. The majority of hits on the site are from search engine bots from Google, Yahoo, Bing, etc. as they index the site. They help...
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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...
  16. 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...
  17. Thread: Impossible?

    by icemeister
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    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...
  20. Thread: Penn tstat

    by icemeister
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    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...
  22. LG Panasonic

    LG
    Panasonic
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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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    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...
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    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?...
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    and raise your suction pressure

    and raise your suction pressure
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    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...
  30. 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. ;)
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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...
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    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.
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    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...
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    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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    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...
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    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.
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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...
  39. Thread: Attachment

    by icemeister
    Replies
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    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
  42. Thread: delta T

    by icemeister
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    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...
  43. Thread: delta T

    by icemeister
    Replies
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    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...
  44. 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...
  45. 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,...
  46. Endeavor Business Media's website: ...

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

    It says they're based in Nashville, TN
  47. 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
  48. 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...
  49. 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.
    ...
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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 . ...
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