Daikin VRV II RXYQ8MY1K, Service Manual

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Precautions for New Refrigerant (R-410A) Si39-502A
284 Precautions for New Refrigerant (R-410A)
1. Precautions for New Refrigerant (R-410A)
1.1 Outline
1.1.1 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
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 JFC125
(*1)
Single-component
refrigerant
Design pressure
3.2 MPa (gauge pressure)
= 32.6 kgf/cm
2
4.0 MPa (gauge pressure)
= 40.8 kgf/cm
2
2.75MPa (gauge pressure)
= 28.0 kgf/cm
2
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%)