Precautions for New Refrigerant (R-410A)
SiUS28-902_B
164
Appendix
5. Precautions for New Refrigerant (R-410A)
5.1
Outline
5.1.1 About Refrigerant R-410A
Characteristics of new refrigerant, R-410A
1. Performance
Almost the same performance as R-22 and R-407C
2. Pressure
Working pressure is approx. 1.4 times more than R-22 and R-407C.
3. Refrigerant composition
Few problems in composition control, since it is a Quasi-azeotropic mixture refrigerant.
1.
Non-azeotropic mixture refrigerant: mixture of two or more refrigerants having different
boiling points.
2. Quasi-azeotropic mixture refrigerant: mixture of two or more refrigerants having similar
boiling points.
3. The design pressure is different at each product. Please refer to the installation manual for
each product.
(Reference) 1 MPa 10.19716 kgf / cm
2
1 MPa 145 psi
HFC units (Units using new refrigerants)
HCFC units
Refrigerant name
R-407C
R-410A
R-22
Composing
substances
Non-azeotropic mixture
of HFC32, HFC125 and
HFC134a (*1)
Quasi-azeotropic mixture
of HFC32 and HFC125
(*2)
Single-component
refrigerant
Design pressure
(*3)
3.2 MPa (gauge pressure)
= 32.6 kgf/cm
2
= 464 psi
4.0 MPa (gauge pressure)
= 40.8 kgf/cm
2
= 580 psi
2.75MPa (gauge pressure)
= 28.0 kgf/cm
2
= 399 psi
Refrigerant oil
Synthetic oil (Ether)
Mineral oil (Suniso)
Ozone destruction
factor (ODP)
0
0
0.05
Combustibility
None
None
None
Toxicity
None
None
None
Pressure-Enthalpy curves of HFC-32/125 (50/50wt%)
