Daikin REYQ8-48PY1B, Service Manual

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SiBE37-701_B Precautions for New Refrigerant (R-410A)
Precautions for New Refrigerant (R-410A) 456
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 HFC125
(*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%)
0.005
100 150 200 250 300 350 400 450
h / k J
•
k g
-1
50 500 550 600 650
0.01
0.02
0.05
0.1
0.2
0.5
1.0
2.0
5.0
10.0
20.0
HFC-32/125 (50/50 wt%)
0
.0
0
0
7
m
3
/k
g
0
.0
0
0
7
5
m
3
/k
g
0
.0
0
0
8
m
3
/k
g
0
.0
0
0
8
5
m
3
/k
g
0
.0
0
0
9
m
3
/k
g
0
.0
0
0
9
5
m
3
/k
g
0.
0
01
m
3
/k
g
0.
001
1
0.
00
12
0.
00
13
0.0
014
0.0
01
5
0.0
02
m
3 /kg
0.00
5 m
3
/kg
0.01 m
3 /kg
0.02 m
3 /kg
0.05 m
3 /kg
0.1 m
3 /kg
0.2 m
3 /kg
0.5 m
3
/kg
1 m
3
/kg
2 m
3
/kg
5 m
3 /kg
10 m
3 /kg 2.
9
2.
8
2.
7
2
.6
2
.5
2.
4
2
.3
2
.2
2
.1
1
.0
2
.0
k
J
/(
k
g
•
k
)
1
.9
1
.8
1
.7
1
.6
1
.5
1
.4
1
.3
1
.2
1
.1
1
.0
k
J
/(
kg
•
k
)
0
.9
0
.8
0
.7
0.
6
0.
5k
J/
(k
g
•
k)
-1
0
0
°C
x=
0
.0
-90
0
.9
0
.8
0
.7
0
.6
0
.5
0
.4
0
.3
0
.2
0
.1
-80
-70
-60
-40
-30
-20
-10
0°C
10
20
30
40
50°C
60
-50°C
70
80
90
100
°C
110
120
13
0
14
0
15
0°C
16
0
170
180
190 200
°C
P
/
MP
a