Precautions For New Refrigerant (R410); Outline - Daikin VRV II RXYQ5MY1B Service Manual

Precautions for New Refrigerant (R410)

1. Precautions for New Refrigerant (R410)

1.1

Outline

1.1.1 About Refrigerant R410A
1. Performance
2. Pressure
3. Refrigerant composition
Refrigerant name
Design pressure
Ozone destruction
H1. Non-azeotropic mixture refrigerant: mixture of two or more refrigerants having different
H2. Quasi-azeotropic mixture refrigerant: mixture of two or more refrigerants having similar
H3. The design pressure is different at each product. Please refer to the installation manual for
318
Characteristics of new refrigerant, R410A
Almost the same performance as R22 and R407C
Working pressure is approx. 1.4 times more than R22 and R407C.
Few problems in composition control, since it is a Quasi-azeotropic mixture refrigerant.
HFC units (Units using new refrigerants)
Non-azeotropic mixture
Composing
of HFC32, HFC125 and
substances
HFC134a (*1)
3.2 MPa (gauge pressure)
= 32.6 kgf/cm
Refrigerant oil
factor (ODP)
Combustibility
Toxicity
boiling points.
boiling points.
each product.
(Reference) 1 MPa 10.19716 kgf / cm
20.0
10.0
5.0
2.0
1.0
0.5
0.2
0.1
0.05
0.02
0.01
0.005
50 100 150
Pressure-Enthalpy curves of HFC-32/125 (50/50wt%)
R407C R410A
Quasi-azeotropic mixture
of HFC32 and JFC125
(*1)
3.80 MPa (gauge pressure)
2
= 38.7 kgf/cm
Synthetic oil (Ether)
0
None
None
2
HFC-32/125 (50/50wt%)
200 250 300 350
h /kJ kg
HCFC units
Single-component
refrigerant
2.75MPa (gauge pressure)
2
= 28.0 kgf/cm
Mineral oil (Suniso)
0
None None
None None
400 450 500 550
-1
Precautions for New Refrigerant (R410)
SiE39-404
R22
2
0.05
600 650