Daikin VRV II REYQ10MY1B, Service Manual

Page: 293 / 309

Precautions for New Refrigerant (R410) Si39-306
282 Precautions for New Refrigerant (R410)
1. Precautions for New Refrigerant (R410)
1.1 Outline
1.1.1 About Refrigerant R410A
„
Characteristics of new refrigerant, R410A
1. Performance
Almost the same performance as R22 and R407C
2. Pressure
Working pressure is approx. 1.4 times more than R22 and R407C.
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 R407C R410A R22
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
3.80 MPa (gauge pressure)
= 38.7 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%)