2.1.2 Pressure and temperature of refrigerant
The pressure in normal condition shows the figure in the right side
table, but the pressure (P1) of high pressure side tube is affected
greatly by the temperature change and about 16kg/cm
2
.G in a low
temperature condition (indoor/outdoor 21°C).
The pressure fluctuation is affected by the tube length or insulation
as well as temperature change, so measure the pressure (P2) of low
pressure side for the trouble shooting of refrigerant system.
<Trouble finding by pressure/temperature>
Note) The high/low temperature is a figure converted into pressure.
The low pressure is normally 4.5-6.0kg/cm
2
G.
(Temperature is normally 3°C-10°C.)
Measuring place Pressure(kg/cm
2
G)
P1 About19.5
P2 About 5.0
Pressure Temperature
Cause Explanation
(than normal) (than normal)
Higher
Higher
Bad compression:
Compressor failure, Bad revers-
ing Valve
Current flows weakly.
Cooling load is small. Current flows weakly.
Liquid refrigerant suction:
Excessive refrigerant charging
Gas short : Gas leak
Closed : Pipe internal
Current is low.
Current is low.
High pressure is not
increased rapidly in early
running stage.
Higher
Normal
Lower
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