Can I mix m099 with R22
William Smith
Updated on April 14, 2026
No. Freon™ MO99 should not be used to top off R-22 systems. Mixing refrigerants is not recommended. R-22 should be recovered using appropriate equipment and managed according to U.S. EPA guidelines specified in Section 608 of the U.S. Clean Air Act.
What refrigerant can you mix with R22?
The most commonly mixed refrigerants in the field are the replacements for R-22 — R-427A, R-438A, R-422D, and R-407C — which are often combined with the remaining R-22 in the system, said Maiorana.
Is MO99 the same as R22?
Of all the “no oil change” replacement refrigerants, Freon™ MO99™ offers the closest performance match to R-22. … It facilitates easy retrofitting in which the technician simply recovers the R-22, replaces critical seals, charges the Freon™ MO99™ refrigerant, and monitors for leaks.
Is MO99 a drop in replacement for R22?
Freon™ M099 is the closest match to R-22 operating pressures and mass flow rates when compared to other “no-oil change” replacements. The use of MO99 will minimize system component changes.What happens if you mix R134A and R22?
R-22 systems are typically about 300 psi maximum. If you add R-22 to an R-134a system, you will not get close to the rated cooling capacity of the A/C system. In conclusion, do not mix R-22 with R-134a refrigerants, you will ruin the charge, and possibly seriously damage or destroy your A/C system.
What is m099 refrigerant?
R438A (Freon™/Isceon MO99) is a HFC blend, used as a replacement for R22 in domestic, industrial and commercial air conditioning systems. It is also a retrofit replacement for R22 in low and medium temperature refrigeration systems and DX chiller systems.
Is it illegal to mix refrigerants?
Due to the destructive effects of the compositions of refrigerants on the environment, the EPA has banned the use of certain refrigerants altogether. These banned refrigerants were to be replaced with new ones, and mixing refrigerants became totally illegal.
Is MO99 any good?
MO99 is simply the best refrigerant if you are considering replacing the refrigerant in your old home air conditioning system. It is ideal because it cools as well as R22 while costing significantly less. Freon™ MO99 refrigerant has proven to be a reliable and cost-effective, non-ozone depleting retrofit refrigerant.Can you add R407C to R-22?
Mixing R22 with R407C According to the 609 EPA rule, mixing refrigerants is illegal and anybody caught doing so will be heavily fined.
How do you convert R22 to MO99?- Establish baseline performance with existing refrigerant. ( …
- Remove all the old (R22 or other) refrigerant from the system into a recovery cylinder. …
- Replace the filter drier and critical elastomeric seals/gaskets.
- Evacuate system and check for leaks.
Is MO99 flammable?
This substance is not flammable in air at temperatures up to 100 deg. C (212 deg. F) at atmospheric pressure. However, mixtures of this substance with high concentrations of air at elevated pressure and/or temperature can become combustible in the presence of an ignition source.
Can a R22 system be converted to R134a?
Using R134a in Systems Designed for R22 If you have a home or auto air conditioner designed to work with R22 refrigerant and the system needs a recharge, a number of issues prevent the direct substitution of R134a.
Can you mix refrigerants in a recovery tank?
In the case of the first category — intentional mixing — an obvious suggestion is to avoid mixing different types of refrigerant in the same recovery cylinder. Unintentional mixing can certainly occur when systems or previously filled recovery cylinders are not labeled correctly.
Can Rs 44 be mixed with R22?
RS-44 is compatible with both mineral and alklybenzene oils found in R22 systems, and also with the polyolester lubricants. Therefore, there is no need to change the lubricant although compressor manufacturers’ recommendations regarding lubricity should be followed.
What happens if you mix refrigerants?
In short, the answer is, “No!” Automotive refrigerants are volatile compounds that can have a negative effect on the environment. Combining them can have adverse effects, and cause damage to your car’s A/C system.
Can you buy R22 refrigerant?
R22 refrigerant is illegal to import and manufacturer in the U.S. But it’s not illegal for anyone to buy R22 freon. And it’s not illegal to sell it IF you have a license. As long as the stocks last, you will be able to continue purchasing R22 from specialized dealers and form your air conditioning company.
What is the best replacement refrigerant for R-22?
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.
WHAT IS 407C refrigerant used for?
R-407C is a non-azeotropic mixed refrigerant composed of the three ingredients R-32, R-125, and R-134a, and was developed as a substitute refrigerant for R-22, used in applications such as air conditioning equipment and chiller equipment for medium temperature ranges.
What is R448A?
R448A (Solstice® N40) is a non-flammable HFO blend, used as a replacement for R404A and R22 in low and medium temperature refrigeration applications.
What is the difference between R22 and 407c?
R407C does not contain the chlorine, necessary for the dissolving of mineral oils, used with R22. It has therefore been necessary to develop oils, which are compatible with the new refrigerants. … Unlike R22, R407C is a mixture of three refrigerants, which boil at different temperatures.
Can I use R32 instead of R22?
Relatively, R32 has very low GWP compared to R22, and therefore leading R32 to be a potential substitute for R22. … The liquid density ratio between R32 and R22 at 0oC is 0.82. As a result, theoretically, for drop-in 100% from R22 with R32, the refrigerant charge amount of R32 is 82% of R22 (by mass).
Can I mix r404a with R407C?
You’re wondering if you can mix different refrigerants for your air conditioning system. The short-long-only answer is no, never. There are many reasons why it’s impractical, illegal, and not economical for a homeowner to mix refrigerant types.
What is r458a?
TdX 20 is described as a next-generation refrigerant blend for use as a replacement for R22, R404A, and R507A refrigerants used in existing HVAC and Refrigeration equipment. …
What is R421A refrigerant?
R421A is an effective refrigerant for process cooling and air-conditioning. R421A has demonstrated its effectiveness at higher temperatures with the benefit of lower discharge temperatures. Charge the equipment with R421A as a liquid.
Is R22 better than R134a?
R134a is more powerful than R22 on the swelling of rubber, and the leakage rate is higher in the actual operation. R134a has a strong corrosive to copper, causing “copper plating phenomenon” in use of the process, so there must additive in the system.
Can you convert a R22 system?
In order to convert an AC unit from R-22 to R-410A, you’ll need a professional to: Evacuate the entire AC (vacuum out all R-22 refrigerant) Flush out any trace of R-22 then wait for the system to dry completely. Sometimes, a tech may have to “flush” the system several times to ensure all R-22 is out of the system.
Can I use R12 in a R22 system?
R12 and R22 are both now banned by the EPA in the United States. Other more environmentally friendly alternatives exist, but even those cannot be changed in air conditioners or other refrigeration units with R12 without a thorough cleaning of the unit.
Why is it important to not mix different refrigerants in the same container when recovering refrigerant?
It is important NOT to mix different refrigerants in the same recovery tank because the mixture may be impossible to reclaim. Recover only one type of refrigerant into a recovery cylinder. If a strong odor is detected during the recovery process, a compressor burn-out has likely occurred.
Are refrigerants interchangeable?
The two types of refrigerants are not interchangeable within a system, so you want to ensure you choose the right one before purchasing your system. There are some other very important differences between the two refrigerants.
Can you mix R22 with r438a?
R-22 penetrates elastomeric seals more substantially than any HFC refrigerant, such as Freon™ MO99. When R-22 is removed from a system, it off-gases and the elastomeric seals shrink and are not likely to return back to that size after charging the system with an HFC blend, leaving an opportunity for a leak.