Maintenance Inspection
SiBE281013
82
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