R22 R23 Refrigerant Summary
R22 R23 Refrigerant Summary explained.
R-23 - Very low temperature and cascade refrigeration (R-13 and R-503 type) Component weight Pure, Charging Original 95%
ASHRAE # (Trade Name) R508B and SUVA 95 Components (Weight %) 23/116 Charging (% Original) 13: 105-110% 503: 90-95%
ASHRAE # (Trade Name) R-403B and ISCEON 69L Components (Weight %) 290/22/218 (5/56/39) Charging (% Original) NA
Application Comments
R-13 systems can retrofit to R-23 (but suffer higher heat at discharge) or R-508B (but the pressures are different). R-503 systems should use R-508B. R-13B1 systems can operate with R-403B, but often in vacuum conditions.
R-22 – Low medium temperature refrigeration (R-502 type) Component weight Pure, Charging Original 100 – 105%
ASHRAE # (Trade Name) R-402A (HP80) Components (Weight %) 125/290/22 Charging (% Original) 95-100%
ASHRAE # (Trade Name) R-402B (HP81) Components (Weight %) 125/290/22 (38/2/60) Charging (% Original) 95-100%
ASHRAE # (Trade Name) R-404A (HP62, FX70) Components (Weight %) 125/143a/22 (44/52/4) Charging (% Original) 85-90%
ASHRAE # (Trade Name) R-408A (FX10) Components (Weight %) 125/143a/22 (7/46/47) Charging (% Original) 85-90%
ASHRAE # (Trade Name) R-507 (AZ50) Components (Weight %) 125/143a (50/50) Charging (% Original) 85-90%
Application Comments
Overall concerns:
Discharge temperature is important as it can’t tolerate a large increase. Higher discharge pressure can affect controls. Oil return is traditionally a problem in 502 low temperature. Most blends are very low glide with no problems.
Retrofit recommendations in order of preference based on performance ease of use.
R-408A Closest match to R-502 properties and performance with slightly higher discharge temperatures.
R-402A Higher discharge pressure, lower discharge temperature than 408A.
R-402B Similar discharge pressure, higher discharge pressure. Good for ice machines. All retrofit blends should consider oil change to AB in order to improve oil circulation.
R-404A or R-507 can be used to retrofit, however mineral oil must be flushed, POE used.
R-404A or R-507 can be used to retrofit, however mineral oil must be flushed, POE used and system components (valves, etc) may have to be changed.
R-417A warmer temps with existing oil. Loses performance and needs POE at low temp.
Long term HFC options
R-404A and R-507 off the shelf equipment is interchangeable with each other.
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