Freon 23 is an HFC retrofit refrigerant for R-13 and R-503 in very low temperature applications [below -40°F to -100°F (-40°C to -73°C)] such as medical freezers and environmental chambers. It can be used in new systems as well as to retrofit existing systems.
ASHRAE: R-23; A1 Safety Classification
Replaces: R-13 and R-503
Benefits: Can be used where high compressor discharge temperature is not a concern.
Very Low Temperature (VLT) [below -40°F to -100°F (-40°C to -73°C)]: