Daikin RZQ Series FCQ20EVA Service Manual page 82

Maintenance Inspection
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
Air Conditioner Status
Air Filter Fouling
Short Circuit of Indoor Unit Inlet/Outlet
Air
Outdoor Unit Fin Fouling
Short Circuit of Outdoor Unit Inlet/Outlet
Air
Air Mixed in Refrigerant
Water Mixed in Refrigerant
Dirt Mixed in Refrigerant
Refrigerant (Gas) Shortage
Insufficient Compression
Heating
Air Conditioner Status
Air Filter Fouling
Short Circuit of Indoor Unit Inlet/Outlet
Air
Outdoor Unit Fin Fouling
Short Circuit of Outdoor Unit Inlet/Outlet
Air
Air Mixed in Refrigerant
Water Mixed in Refrigerant
Dirt Mixed in Refrigerant
Refrigerant (Gas) Shortage
Insufficient Compression
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 slight.
73
Low Pressure High Pressure
Lower
Lower
Higher
Higher
Higher
Lower 1
Lower 2
Lower
Higher 3
Low Pressure High Pressure
Higher
Higher
Lower
Lower
Higher
Lower 1
Lower 2
Lower
Higher 3
SiME281501E
Running Current
Lower Lower
Lower Lower
Higher Higher
Higher Higher
Higher Higher
Lower Lower
Lower Lower
Lower Lower
Lower Lower
Running Current
Higher Higher
Higher Higher
Lower Lower
Lower Lower
Higher Higher
Lower Lower
Lower Lower
Lower Lower
Lower Lower
Service Diagnosis