ReplyLots of threads on here about Isceon, MO99, Nu22, 422b, 407c, 414b, 438a, etc. ad infinitum
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I was wondering what how well the R-22 replacement refrigerants work. I have a walk in cooler at my cabin which developed a leak at a flare over the summer and rather than shelling out the dough for a cyl. of the real stuff I thought I'd try the replacement. (at about half the cost) Also wondering how the operating pressures compare. Thanks.
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Lots of threads on here about Isceon, MO99, Nu22, 422b, 407c, 414b, 438a, etc. ad infinitum
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Which of these are direct drop in replacements?Originally Posted by Pete838
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MO99/438a is the closest as far as properties/pressures, but there is no "drop-in" you can top off 22 with a secondary gas. It will only save you 20 or 25 percent, though. DuPont has a video on YouTube with more info.
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I give a vote for 407c. Two installs w/ 3 units and one conversion w/ no callbacks yet.
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http://coolantexpress.com/
Just heard about this website today. Sounds like a bunch of b.s.
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R-22 replacement= r-410a
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Not for refrigeration med temp
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Yeah, they only give you 12lbs!!!
Because Coolant Express 22a Refrigerant is so efficient you will use up to 40% less! Please see equivalencies below.
The 30 lb cylinder = 12 lbs of Coolant Express Refrigerant and is EQUIVALENT to 30 lbs of R22a
The 50 lb cylinder = 20 lbs of Coolant Express Refrigerant and is EQUIVALENT to 50 lbs of R22a
Each ounce of Coolant Express 22a Refrigerant is equivalent to 2.5 ounces of R22.
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MANY years ago, in the 1990's, I was doing 134a conversions on R12 systems in cars. The guideline was that you could only charge 80% of the weight of the R12 system label value once you had replaced the receiver or accumulator (depending on the system) and drained out whatever oil you could.
That's probably the reason they say you need less.
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One of the main things that affects that(how many pounds you need) is the refrigerant density.
Goto a thermophysical properties chart for r717 and r22 and compare lb per cubic foot. R22 is over twice as dense.
R22a should publish same info as well as what the components are.
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