Help needed with homebuilt glycol beer cooler, capilary size and length

Hello everyone

I am hoping someone smarter than me can help me out.
I have built a home made glycol cooler much like this one.…e-13-hp-air-75

it is using a dan foss compressor 1/3hp using 134a
it has a 1/2hp condenser with a variable speed fan.
it is using about 90 feet of 3/8 copper tube in a coil as the evaporator.
it has a tub of 50/50 glycol water that holds 3 gallons, the entire system holds about 4 gallons of 50/50

I need to get the glycol down to about -20f to send it to my ice beer tower.

I need to know what size and what length capillary tube is needed
and also how much refridgerant should I use.

if there is anyone out there that can help me out please let me know

Thank you.

P.s. I know that in the web page it says .054, @ 112″ but this is with a matching condenser. ie. 1/3hp compressor to 1/3 condenser

BUT my unit is 1/3 compressor to 1/2hp condenser. and I am un sure of the final bath temp in the one in the web page, this is why I need help.

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There’s got to be something I’m missing. Any ideas of what else I can look for or check?

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I have difficulty triggering it by leaving either fridge or freezer door open. I’m also not sure if it associated with when the compressor kicks in…I really can’t tell.

Any hypotheses on what might be the cause is very welcome!


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American Retro Coke Cooler, Need small refrigerator help.

I have a small coke cooler box made by American Retro. It had a Zel compressor that died, so I picked up a similar compressor by Emraco Model # FF8.5HBK that runs on R134a. I have a few concerns about the replacement. I will be replacing the dryer tube and adding an access valve at the same time. Here are my questions:

  1. What oil do I add? The manufacturere says use 9+ ounces of ISO 22. I cannot find any oil with that rating.
  2. How do I determine the exact amount of refrigerant to add? There is no tag whatsover with fill specifications or pressure.
  3. At what pressure should it be operated?

If there are any specifics I can find, please let me know. The manufacturer is in China and the owners manual or info from manufacturer is a no-go.

Thanks in advance!!

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