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    For the compressor type, I assume you mean a...

    For the compressor type, I assume you mean a Copeland "Scroll" and not "Screw". They did make screws starting at 20 hp at one time but I believe they have been phased out. The Copeland ZF scroll is...
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    Coconut water is considered Nature's Gatorade. ...

    Coconut water is considered Nature's Gatorade. It's very popular among the drinks sold by street vendors and tiendas here in Ecuador.
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    I agree with the lower temperature for floral...

    I agree with the lower temperature for floral boxes. I had a number of my customer require 36F or lower saying this is what was being recommended by their flower distributors. I heard the same...
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    Chrome is my everyday browser but I haven't been...

    Chrome is my everyday browser but I haven't been able to load the Copeland OPI using Chrome for several months, so I use Firefox for that. In convenient, but it works.
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    I learned something new today from this. I had...

    I learned something new today from this. I had no idea there was such a thing as a Scott T 3-phase motor.

    I installed one maybe 8 years ago but never noticed the difference. Thankfully I...
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    Is the vacuum pump oil getting milky colored? ...

    Is the vacuum pump oil getting milky colored? That would be a sure sign of a lot of moisture in the system and could also explain why you hit a wall at 1700 microns.
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    Here's the installation manual for the 38AH...

    Here's the installation manual for the 38AH (Charging instructions start on p.38): https://dms.hvacpartners.com/docs/1005/public/0b/38ah-22si.pdf
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    I'm glad it helped you understand more about...

    I'm glad it helped you understand more about condenser sizing. If you want a good step-by-step example of a typical selection, I have on my website a short article I wrote a while back:

    ...
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    TD is directly proportional to the capacity of a...

    TD is directly proportional to the capacity of a condenser. The same is true with any heat transfer.



    Larger coils give greater greater surface area for heat transfer.

    The higher...
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    Just remember this is a situation where the...

    Just remember this is a situation where the equipment has already been selected, so you're goal here is to determine if the condenser is a good match. As I said earlier, without any specifics we had...
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    The initial TD is determined by the condensing...

    The initial TD is determined by the condensing temperature you select when you size the compressor. With a condenser selected, the Total Heat of Rejection (THR) determines the final TD.
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    That's what the table says for that condenser for...

    That's what the table says for that condenser for a 25F TD, yes. But where did the 25F TD figure come from? I didn't use it in my calcs.
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    Since all we have for hard performance data on...

    Since all we have for hard performance data on this chiller is at nominal or standard conditions, I chose to use that as the basis for checking the matchup of the remote condenser and the chiller...
  14. Sporlan Bulletin 20-10 / Refrigerant...

    Sporlan Bulletin 20-10 / Refrigerant Distributors: (See p.2-4)
    ...
  15. Actually, with a pressure-drop type of...

    Actually, with a pressure-drop type of distributor like the ones made by Sporlan, you DO need both the TXV and the nozzle. The nozzle isn't there as a metering device per se. It's needed for equal...
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    Since in this case the condenser was already...

    Since in this case the condenser was already selected, I did a little reverse engineering of the standard selection procedure to find where the system balance point would be at the rated condensing...
  17. I recall this being reported here on Htalk once...

    I recall this being reported here on Htalk once or twice before. If they "worked" at all, they would definitely need to have a distributor nozzle installed.
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    The Carrier 30HXA-126 has an AHRI rated capacity...

    The Carrier 30HXA-126 has an AHRI rated capacity with 44F leaving water temp and 125F SCT with R134A of 113.9 tons requiring 125.4 KW input power.

    Calculating for the total heat of rejection...
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    Good catch. Somehow I got the model number as a...

    Good catch. Somehow I got the model number as a 30HXA-161.

    Disregard post #7. I'll redo it and show how I did it.
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    For its nominal capacity of 147.3 tons at a...

    For its nominal capacity of 147.3 tons at a 125F SCT with a power input of 159.9 KW, I get a Total Heat of Rejection (THR) of 2,313,178 Btuh. The Krack condenser has a specific capacity of 114,110...
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    For sealing the seams, use a good quality 100%...

    For sealing the seams, use a good quality 100% Silicone RTV on the outside to prevent moisture from entering and condensing in the joint. You can then seal the inside with the same RTV but it will...
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    Yes, it's basically a matter of scaling the...

    Yes, it's basically a matter of scaling the displacement up or down to get the capacity you need. A manufacturer will come out with a "family " of compressors which are optimized for specific...
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    The suction vapor density difference is just...

    The suction vapor density difference is just another way of comparing the relative capacities. My example is a comparison of the required compressor displacements.

    To do the calculations, go...
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    There would be a reduction of capacity of 40% or...

    There would be a reduction of capacity of 40% or so when using MO99 or R22 in a R410A condensing unit meaning a 5 ton R410A unit would be roughly equivalent to a 3 ton. If you match it up with a 3...
  25. The ZPS two-stage scroll has been around for a...

    The ZPS two-stage scroll has been around for a long time as the old Ultra-Tech two-stage. The latest generation is the ZPS-K6E.
    ...
  26. He's talking about two different units. One is a...

    He's talking about two different units. One is a 5-ton 1 Ph condensing unit and the other is a 10-ton unit with two 5-ton compressors in it.
  27. Since we still don't know what compressor is in...

    Since we still don't know what compressor is in the Bryant 5 ton 1 ph condensing unit, let's assume it's the same model as the 3 ph ZP51K5E-TF5 exception that it's the -PFV 1 ph model. This way we...
  28. We can't help you with a meaningful comparison...

    We can't help you with a meaningful comparison and answer because you omitted the manufacturer & model numbers from both images. Also the single phase RLA is for the unit whereas the three phase RLA...
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    There's really not a lot of written material...

    There's really not a lot of written material available for compound two-stage market systems, primarily because they were a temporary measure taken by rack manufacturers to get arounf the looming ban...
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    Very nice. 33F superheat and a happy...

    Very nice. 33F superheat and a happy compressor. ;)
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    From the way the OP describes it, this is...

    From the way the OP describes it, this is constructed much like a typical home chest freezer with the evaporator in the walls, except it's huge...15 ft x 15ft x 5 ft high. He wants to add evaporator...
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    The ice blocks are made in another unit. This...

    The ice blocks are made in another unit. This chest freezer is only for storage of completed blocks.
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    Here's the spec sheet: ...

    Here's the spec sheet: https://www.hussmann.com/en/Technical%20Documents/0510175_J_RL_III.pdf

    For frozen foods use 970 Btuh/door at -14 and for ice cream use 1065 Btuh/door.

    You'll need ti...
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    !5 ft x 15 ft x 5 ft is an enormous chest...

    !5 ft x 15 ft x 5 ft is an enormous chest freezer. It's simply too big for a cold wall alone to be effective. Consider adding several vertical rows of evaporator tubing to split up the freezer into...
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    Where does the manufacturer;s information state...

    Where does the manufacturer;s information state that?
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    I used them on remote pizza prep tables where...

    I used them on remote pizza prep tables where they get moved every day for cleaning. The only problem I found was these hoses don't like to twist. They only want to bend.

    He should get the...
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    Those pressures appear to be within a normal...

    Those pressures appear to be within a normal range for a R134A prep table. Whey then would you suspect a restricted cap tube? 0 psig suction and 120 pisg discharge perhaps, but not with what we're...
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    Ritchie Engineering - Yellow Jacket makes a...

    Ritchie Engineering - Yellow Jacket makes a braided stainless steel flex hose for refrigeration applications. See p.30:...
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    Another thing about these factory installed TXV's...

    Another thing about these factory installed TXV's is they will be sized for the nominal 10F TD rating of the evaporator coil. IF for example you're doing a convenience store beer walk-in cooler and...
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    I'm glad I told you what happened to me. ...

    I'm glad I told you what happened to me. Otherwise you may not have checked for the loose cartridge.

    When I forgot to tighten the cartridge, it as early days for me and Q-body field assembled...
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    A common rule-of-thumb is 4F per turn, but in...

    A common rule-of-thumb is 4F per turn, but in reality the F per turn of the adjusting stem varies with the refrigerant and the evaporating temperature, so it's difficult to come up with a good rule...
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    The initial head pressure of 257 psig would be...

    The initial head pressure of 257 psig would be high for 80F ambient. The drop to 180 psig is typical with a wet coil.
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    I said that because a ZP TXV would be within its...

    I said that because a ZP TXV would be within its throttling range at 38 psig, so it should have been restricting flow. Typically with these MOP type valves you initially pull down with a starved...
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    R404A and TXV with a ZP pressure limiting...

    R404A and TXV with a ZP pressure limiting powerhead.

    He had 5F superheat at the compressor, which indicates flooding at the evaporator to me. With a 38 psig suction pressure, the evap should be...
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    Suction/liquid heat exchanger.

    Suction/liquid heat exchanger.
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    BTW...I've asked for this to be moved to a new...

    BTW...I've asked for this to be moved to a new thread. ;)
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    I once forgot to tighten down the cartridge in a...

    I once forgot to tighten down the cartridge in a Sporlan Q valve and got the same kind of floodback.
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    Never trust, therefore verify. Replace the valve.

    Never trust, therefore verify. Replace the valve.
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    My initial thought says the TXV isn't doing what...

    My initial thought says the TXV isn't doing what it's supposed to do...ie, control superheat.

    Did somebody assemble this valve for you and forget to put a cartridge in it? I've heard of that...
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    Good news!

    Good news!
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