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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