Precautions For New Refrigerant (R410A); Outline - Daikin VRV II Series Design, Installation & Testing Instructions

Precautions for New Refrigerant (R410A)

1.

Precautions for New Refrigerant (R410A)

1.1

Outline

1.1.1 About Refrigerant R410A
!
1. Performance
2. Pressure
3. Refrigerant composition
Ozone destruction
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222
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)
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
R407C
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
Pressure-Enthalpy curves of HFC-32/125 (50/50wt%)
HCFC units
R410A
Single-component
refrigerant
2.75MPa (gauge pressure)
2
= 28.0 kgf/cm
Mineral oil (Suniso)
0
None
None
Precautions for New Refrigerant (R410A)
Si39-303
R22
2
0.05
None
None