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.



Return from R22 R23 Refrigerant Summary to Home Page

Return from R22 R23 Refrigerant Summary to Explain Refrigerant

Hard copy and E book for sale. Introduction to Building Mechanical Systems. Click here.

Hard copy and E book for sale. What's Killing You and What You Can Do About It. A humourous look at ageing and disease. Click here.