Retrofit Refrigerants – A-Gas Quick Selection Guide
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Application
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System type
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Recommended refrigerant*
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Additional Considerations
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Air conditioning
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Capillary systems/fixed orifice
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R424A (RS44) or R417A (ISCEON MO59)
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Potential loss of capacity
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TEV systems
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R434A (RS45) or R422D (ISCEON MO29)
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Seals, potential loss of capacity
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Large A/C
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R434A (RS45) & R422D (ISCEON MO29)
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Seals, TEV sizing
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Medium Temperature Refrigeration
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Water Chillers
Cold Rooms
Cabinets & Display Cases
Process Cooling
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R434A (RS45) & R422D (ISCEON MO29) or R438A (ISCEON MO99)
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Pay careful attention to:
· Potential loss of capacity
· Seals
· Oil return
· Undersized TEVs
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Flooded systems
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R434A (RS45)
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Call for advice
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LPR systems
Jacketed Vessels
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R434A (RS45) or R422D (ISCEON MO29)
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Call for advice
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Low temperature refrigeration
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Freezer Rooms
Ice Cream Machines
Cabinets & Display Cases
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R428A (RS52), R422A (ISCEON MO79) (or R404A/R507 with an oil change)
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Must change TEV to R404A/R507 type
Pay careful attention to:
· Potential loss of capacity
· Seals
· Oil return
· Higher discharge pressures
· Condenser capacity
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Flooded systems
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R428A (RS52) or R507
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Call for advice
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*Please note these recommendations are based on industry experience and manufacturers current recommendations. There is no one single direct drop-in replacement for R22 and careful attention should be paid to the known problem areas
For further advice, retrofit guidelines and additional technical information:
Telephone: 01275 376600 or visit www.refsols.com www.isceon.com/uk
Trade Name ASHRAE number Trade Name ASHRAE number
RS44 R424A ISCEON MO29 R422D
RS45 R434A ISCEON MO59 R417A
RS52 R428A ISCEON MO79 R422A
ISCEON MO99 R438A