Pressure Characteristics - Mitsubishi Electric PQRY-P200YEM-A Service Handbook

[3] Pressure Characteristics

Compared to the previous refrigerant (R22), the pressure of the new refrigerant (R407C) is higher.
Pressure (Gauge)
Temperature (°C)
-20
0
20
40
60
65
Data source: Japan refrigeration and air conditioning association thermal characteristics chart NIST REFROP
V5.10. Asahi Glass, other
Note:
1. Mixing of refrigerants
R407C is a refrigerant which is a mixture of HFC32, HFC125 and HFC134a. R407C has different characteris-
tics from R22, so absolutely do not mix them.
Also, absolutely do not add R410a to this refrigerant.
2. Moisture control
If a lot of moisture is mixed into the refrigeration system, it will cause hydrolysis of the organic materials used
in the refrigerator oil or compressor motor, etc., and this could cause capillary clogging or failure of the
insulation on the compressor or other components.
3. Impurities control
If a lot of dirt, air or flux are mixed into the refrigerant, it could accelerate decomposition or aging, etc. of the
refrigerator oil, or could cause clogging of capillaries or failure of the compressor.
R407C
MPa (Gauge)/kgf/cm 2 (Gauge)
0.18/1.8
0.47/4.8
0.94/9.6
1.44/14.7
2.44/24.9
2.75/28.0
–156–
R22
MPa (Gauge)/kgf/cm 2 (Gauge)
0.14/1.4
0.40/4.1
0.81/8.3
1.44/14.7
2.33/23.8
2.60/26.5