Precautions For New Refrigerant (R-410A); Outline - Daikin RTSQ20PY1 Service Manual

SiBE31-801_C

1. Precautions for New Refrigerant (R-410A)

1.1

Outline

1.1.1 About Refrigerant R-410A
1. Performance
2. Pressure
3. Refrigerant composition
Ozone destruction
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★
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Precautions for New Refrigerant (R-410A)

Characteristics of new refrigerant, R-410A
Almost the same performance as R-22 and R-407C
Working pressure is approx. 1.4 times more than R-22 and R-407C.
Few problems in composition control, since it is a Quasi-azeotropic mixture refrigerant.
HFC units (Units using new refrigerants)
Refrigerant name
Non-azeotropic mixture
Composing
of HFC32, HFC125 and
substances
HFC134a (*1)
3.2 MPa (gauge pressure)
Design pressure
= 32.6 kgf/cm
Refrigerant oil
factor (ODP)
Combustibility
Toxicity
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
20.0
10.0
5.0
2.0
1.0
0.5
0.2
-40
-50°C
0.1
-60
0.05
-70
0.02 -80
0.01
-90
0.005
100 150
50
Precautions for New Refrigerant (R-410A)
R-407C
Quasi-azeotropic mixture
of HFC32 and HFC125
(*1)
4.0 MPa (gauge pressure)
2
= 40.8 kgf/cm
Synthetic oil (Ether)
0
None
None
2
HFC-32/125 (50/50 wt%)
60
50°C
40
30
20
10
0°C
-10
-20
-30
200 250 300 350
h / k J
Pressure-Enthalpy curves of HFC-32/125 (50/50wt%)
HCFC units
R-410A
Single-component
refrigerant
2.75MPa (gauge pressure)
2
= 28.0 kgf/cm
Mineral oil (Suniso)
0
None
None
70
400 450 500 550
-1
•
k g
R-22
2
0.05
None
None
600 650
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