Hfo1234Yf
The Service Sector Prepares for HFO-1234yf
Paul DeGuiseppi MACS Worldwide Mary Koban, DuPont Fluoroproducts
Agenda
HFO-1234yf Review Service Differences Technician Training Recovery/Recycle/Recharge Equipment Storage and Handling
HFO-1234yf Properties
Properties Pvap, MPa (25oC) Pvap, MPa (80oC) GWP (100 ITH) Toxicity Flammability 1234yf 0.677 2.44 4 A-Low Mild 134a 0.665 2.63 1410 A-Low None
Vapor Pressure
3.5 3
Pressure (MPa)
2.5 2 1.5 1 0.5 0 -40
REFPROP Equation Of State available
134a HFO-1234yf
Temperature, oC
-20 0 20 40 60 80 100
HFO-1234yf has vapor pressure, toxicity class A, similar to R-134a, but has mild flammability
Servicing Differences
Some potential service differences for HFO-1234yf are: Service shops and technicians may need to purchase/use new equipment (flammability/product differences)
Recovery/recycle/recharge equipment Refrigerant identifiers Leak detection equipment
HFO-1234yf refrigerant system components should not be replaced with ones removed from a system that uses another type of refrigerant, or from a salvaged vehicle
Replacement evaporators should meet SAE J2842
HFO-1234yf is mildly flammable
Precautions used with other flammables (gasoline, oil) are applicable to HFO-1234yf
Servicing Differences
Some potential service differences for HFO-1234yf are: Lubricants used with HFO-1234yf systems may be different than those currently used
Hybrid compressors, driven by high-voltage electric motors, or equipped with hermetic mobile A/C systems, use different oils Necessary to check oil requirements
Do-it-yourselfers may charge non-approved refrigerants into HFO-1234yf systems
Result – refrigerant cross contamination Could cause system failure and/or system misdiagnoses
Servicing Differences
Typical OEM R-134a Label Proposed OEM HFO-1234yf Label
Additional Information:
Refrigerant flammability symbol J2845 Technician Training for Safe Service and Containment of Refrigerants
6
Paul DeGuiseppi MACS Worldwide Mary Koban, DuPont Fluoroproducts
Agenda
HFO-1234yf Review Service Differences Technician Training Recovery/Recycle/Recharge Equipment Storage and Handling
HFO-1234yf Properties
Properties Pvap, MPa (25oC) Pvap, MPa (80oC) GWP (100 ITH) Toxicity Flammability 1234yf 0.677 2.44 4 A-Low Mild 134a 0.665 2.63 1410 A-Low None
Vapor Pressure
3.5 3
Pressure (MPa)
2.5 2 1.5 1 0.5 0 -40
REFPROP Equation Of State available
134a HFO-1234yf
Temperature, oC
-20 0 20 40 60 80 100
HFO-1234yf has vapor pressure, toxicity class A, similar to R-134a, but has mild flammability
Servicing Differences
Some potential service differences for HFO-1234yf are: Service shops and technicians may need to purchase/use new equipment (flammability/product differences)
Recovery/recycle/recharge equipment Refrigerant identifiers Leak detection equipment
HFO-1234yf refrigerant system components should not be replaced with ones removed from a system that uses another type of refrigerant, or from a salvaged vehicle
Replacement evaporators should meet SAE J2842
HFO-1234yf is mildly flammable
Precautions used with other flammables (gasoline, oil) are applicable to HFO-1234yf
Servicing Differences
Some potential service differences for HFO-1234yf are: Lubricants used with HFO-1234yf systems may be different than those currently used
Hybrid compressors, driven by high-voltage electric motors, or equipped with hermetic mobile A/C systems, use different oils Necessary to check oil requirements
Do-it-yourselfers may charge non-approved refrigerants into HFO-1234yf systems
Result – refrigerant cross contamination Could cause system failure and/or system misdiagnoses
Servicing Differences
Typical OEM R-134a Label Proposed OEM HFO-1234yf Label
Additional Information:
Refrigerant flammability symbol J2845 Technician Training for Safe Service and Containment of Refrigerants
6