Maintenance Inspection ESIE15-13B
98 Service Diagnosis
Correlation of Air-Conditioner’s Operation Status and Pressure / Running Current
What happens in comparison to normal values is summarized in the table below.
(Measured for 15 ~ 20 minutes or more after operation starts.)
Cooling
Heating
Note:
*1. Water in the refrigerant freezes inside the capillary tube or electronic expansion valve, and is basically the
same phenomenon as pump down.
*2. Dirt in the refrigerant clogs filters inside the piping, and is basically the same phenomenon as pump
down.
*3. Pressure differential between high and low pressure becomes low.
Air-Conditioner Status Low Pressure High Pressure Running Current
Air Filter Fouling Lower Lower Lower
Short Circuit of Indoor Unit Inlet/Outlet
Air
Lower Lower Lower
Outdoor Unit Fin Fouling Higher Higher Higher
Short Circuit of Outdoor Unit Inlet/Outlet
Air
Higher Higher Higher
Air Mixed in Refrigerant Higher Higher Higher
Water Mixed in Refrigerant Lower *1 Lower Lower
Dirt Mixed in Refrigerant Lower *2 Lower Lower
Refrigerant Shortage Lower Lower Lower
Unsatisfactory Compression Higher *3 Lower Lower
Air-Conditioner Status Low Pressure High Pressure Running Current
Air Filter Fouling Higher Higher Higher
Short Circuit of Indoor Unit Inlet/Outlet
Air
Higher Higher Higher
Outdoor Unit Fin Fouling Lower Lower Lower
Short Circuit of Outdoor Unit Inlet/Outlet
Air
Lower Lower Lower
Air Mixed in Refrigerant Higher Higher Higher
Water Mixed in Refrigerant Lower *1 Lower Lower
Dirt Mixed in Refrigerant Lower *2 Lower Lower
Refrigerant Shortage Lower Lower Lower
Unsatisfactory Compression Higher *3 Lower Lower
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