Is mo99 compatible with POE oil?

Asked By: Nirmala Tropinsky | Last Updated: 14th January, 2020
Category: home and garden indoor environmental quality
4.6/5 (62 Views . 18 Votes)
Freon™ MO99 matches R-22 in terms of capacity and efficiency in most systems, is compatible with mineral oil and POE oil providing a quick, cost-effective R-22 replacement, and it can be topped off during service without removing the entire refrigerant charge.

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Also question is, can mo99 be mixed with r22?

There are "drop-in" R22 replacement in the market like R421a, R422B and MO99 (also MO29 for low-temp applications) but NONE of those can be mixed with R22.

Subsequently, question is, can I mix mineral oil and POE oil in a system? When using CFC or HCHC refrigerants, POE and MO can be mixed. The exception is R12 that only uses MO or Alkyl Benzene Mineral Oil (ABMO) blend. HFC refrigerants can only use POE oil.

Regarding this, is mo99 a blend?

R438A, also known as ISCEON® MO99, is an HFC blend designed to be a "drop-in" replacement for R22 across a wide range of applications, including low, medium and high temperature refrigeration, and residential, commercial and industrial air conditioning.

What is the best replacement for r22 refrigerant?

The best replacement for R-22 Freon is usually R-407c. It has a very low loss in capacity (0 – 5%) relative to R-22 and is less expensive than many other R-22 replacement refrigerants. If a system has R22 in it already you cannot use a replacement refrigerant to simply add to the R22.

25 Related Question Answers Found

What refrigerant is a direct replacement for r22?

RS-44b is a direct replacement for R22, providing an easy and long term solution. Because there is no need to use expensive and hygroscopic synthetic lubricants (POE), the risk of moisture ingress into a refrigeration system is completely avoided.

What happens if you put 410a in a r22 system?

No, you cannot. To make a short story long, R410A and R22 are refrigerants. They are both good refrigerants and they both work, but they have to be charged in the system at different pressures. R410A is a higher pressure system and R22 is a lower pressure system.

What happens if you mix refrigerants?

When an alternative refrigerant is mixed with R-22, there is no pressure-temperature chart to refer to and therefore no way to optimize the system charge. Improper superheat or subcooling can lead to compressor floodback, overheating, and dramatically reduce system efficiency and compressor lifetime.

How do you convert r22 to mo99?

How to Convert R22 to MO99 Refrigerant Retrofit Guide
  1. Establish baseline performance with existing refrigerant. (
  2. Remove all the old (R22 or other) refrigerant from the system into a recovery cylinder.
  3. Replace the filter drier and critical elastomeric seals/gaskets.
  4. Evacuate system and check for leaks.
  5. Charge with ISCEON® MO99.
  6. Remove liquid only from charging cylinder.

What is mo99?


Freon™ MO99 is a non-ozone depleting HFC refrigerant designed to replace R-22 in existing DX residential and commercial AC and medium- and low-temperature refrigeration systems. Freon™ MO99 is compatible with traditional and new lubricants; in most cases, no change of lubricant type during retrofit is required.

What is R 438a?

R-438A is a non-ozone depleting hydrofluorocarbon (HFC) refrigerant blend which can be used to retrofit existing hydrochlorofluorocarbon (HCFC) refrigerant R-22 refrigeration and air conditioning systems with direct expansion evaporators and positive displacement compressors.

What happens when you mix Poe and mineral oil?

When POE oils first gained common use it was widely rumored that mixing POE and mineral oil would result in “sludge”. This has been proven to be a myth, and to some extent manufacturers of retrofit, refrigerants have been suggesting adding small amounts of POE to mineral oil to help carry it through the system.

Can you mix PAG and POE oil?

PAG oil and POE oil do not mix properly. A high percentage of POE will reduce lubrication performance.

What is the difference between mineral oil and POE oil?

It is compatible with mineral oil and compared to mineral oil, it has improved refrigerant miscibility with R-22 at low-temperature conditions. Polyolester (POE) – the primarily synthetic oil for refrigeration systems using HFC refrigerants. It is more hygroscopic than POE oil but less than PAG oil.

What refrigerants use POE oil?


Polyolester oil (POE oil) is a type of synthetic oil used in refrigeration compressors that is compatible with the refrigerants R-134a, R-410A and R-12. It is recommended by experts as a replacement for hydrofluorocarbons (HFCs).

Can you use 407c with mineral oil?

For safe system operation it is essential to remove the mineral oil from the existing system, as R407C is not compatible with mineral oil.

What is Poe in HVAC?

POE Oil, or Poly Olester Oil, is a synthetic oil that is used in refrigeration compressors and the refrigeration system with Hydroflurocarbon refrigerants. These oils really became popular with the debut of R-410A refrigerant about ten years ago.

Is ester oil and POE oil the same?

The transitional solution was polyol ester oil (“esteroil or POE). Ester oil is often called “retrofit oil” because it mixes with both R-12 and R-134a. Like PAG oil, Ester oil is a synthetic lubricant. Ester oil comes in only one viscosity so it does not include the viscosity numbers associated with PAG oils.

Does mineral oil absorb moisture?

Unlike DOT fluid, Mineral Oil is hydrophobic and does not absorb moisture from the environment. This is because as the fluid repels any water ingress, it causes it to pool at low points within the brake system, usually the caliper, since water is heavier than brake fluid it will settle at the lowest point.

How do you get moisture out of Poe oil?


Moisture will stay dissolved in the oil and cannot be readily removed by applying a vacuum; moisture can only be removed from POE oil with the use of a desiccant. Again, normal servicing practices always recommend replacing the liquid line filter-drier when a system is opened for service.

What is r422d refrigerant?

R422D (Freon™/Isceon® MO29) is a HFC blend, originally designed to replace R22 in direct expansion water chillers. It is now used as a retrofit refrigerant for R22 in low and medium temperature refrigeration and air conditioning systems.

What is MO 99 freon?

FreonMO99 (R-438A) refrigerant has proven to be a reliable and cost-effective, non-ozone depleting retrofit refrigerant. FreonMO99 matches R-22 in terms of capacity and efficiency in most systems, but with a significantly lower discharge temperature that may prolong the life of the compressor.