R-407A is a close match to R-22's capacities and flow rates, making it well suited as a retrofit for R-22 in supermarket and food storage applications. Additionally, R-407A is one of the more energy efficient R-22 retrofit options available for refrigeration applications.
Freon™ 407C is suitable as a replacement for R-22 in medium-temperature (20 to 40 °F [-6.7 to 4.4 °C]) evaporator conditions, but loses capacity at lower temperatures, where higher pressure refrigerants such as Freon™ 404A are recommended.
Heating mode The compressor pressure ratio of R-407C was 0.7% to 9.3% higher than R-22 for the two heating mode test conditions.
R-407C should be used only in systems that currently use R-22. It should not be mixed with R-22 or any other refrigerant. 5. The capacity of the existing R-22 thermal expansion valve (TEV) will be approximately the same when using R-407C.
An R-22 Refrigerant Replacement for Direct Expansion Refrigeration. Freon™ MO29 (R-422D) refrigerant is a low-toxicity, non-ozone depleting hydrofluorocarbon (HFC) replacement for R-22.
R-407A is a close match to R-22's capacities and flow rates, making it well suited as a retrofit for R-22 in supermarket and food storage applications. Additionally, R-407A is one of the more energy efficient R-22 retrofit options available for refrigeration applications.
Freon MO99 is the closest capacity match to R-22, compared with most other no-oil change refrigerants.
Mixing R22 with R407C or any other refrigerant. According to the 609 EPA rule, mixing refrigerants is illegal and anybody caught doing so will be heavily fined.
Genetron 407C and Genetron 422D are HFC refrigerants and are not scheduled for phaseout under current law. Descriptive information including refrigerant type, ASHRAE number, constituents and applications appear in the table below. Genetron 407C is not a “drop-in” Replacement.
The commonly used synthetic refrigerants such as R134a, R407C and R410A have a GWP value higher than 2,500. As a result, their production is being phased out.
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.
So… what refrigerant can be mixed with R-22? None. You can't mix refrigerants.
R-407C has the closest capacity to R-22 for air conditioning, while R-407A offers performance similar to R-22 in supermarket refrigeration. R427A is a hybrid blend that mirrors R-22's operating pressures, allowing it to be used in a wider range of systems.
Freon™ 407A (R-407A) refrigerant is a reliable, stable, and nonflammable option for low- and medium-temperature refrigeration systems. This non-ozone depleting, hydrofluorocarbon (HFC) refrigerant is a replacement for R-22 and provides a lower global warming potential (GWP) alternative to R-404A and R-507.
407C REQUIRES AN OIL CHANGE TO POE OIL WHEN RETROFITTING A R22 SYSTEM! All HFC refrigerants are made to be used with and are only truly miscible with polyolester oil (POE).
Opteon™ XP20 (R-449C) refrigerant is a hydrofluoroolefin (HFO) option that replaces R-22 and R-407C in residential and commercial air conditioners, as well as direct expansion chillers. It has similar performance and properties to R-22 and R-407C and can be used in both retrofit and new equipment.
Features and Benefits. Freon™ 407C has been a popular R-22 replacement because of its properties, which include: Similar cooling capacity, energy efficiency, and pressures as R-22 in systems. An ability to be topped off after a leak, multiple times, with minimal impact on system performance.
The compressor pressure ratio of R-407C with the original coil configuration was up to 12.7% higher during air-conditioning operation than R-22, but when the evaporator coil was changed to counterflow the pressure ratio dropped to 10% higher than R-22.
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. They are known as Polyolester or POE oils.
Comstar RS-44b is the closest, market available drop-in replacement for R22 that requires no oil changes and no system changes. Other features include: Equal Flow Rate & Cooling Capacity as R22. Lower Discharge Pressure compared to R-407A, R-407C and R-427A.
The biggest problem of using refrigerant R404A to replace refrigerant R22 is the problem of lubricating oil. PVE ester oil must be used to replace the mineral lubricating oil for R22. Ester lubricants have high affinity with water and poor dehydration.
Due to the zeotropic nature of R-407C, it should be charged as a liquid to prevent fractionation (changes in refrigerant composition due to vapor charging.
Freon™ MO99 can be used to retrofit R-22 heat pumps .
The pressure can become high enough for parts of the system to rupture. At the very least, leaks will occur.
Final answer: Of the provided options, R-407C is the approved 'drop-in' replacement for R-22, commonly used in air conditioning systems.