Hitachi FSG Series Service Manual page 25

1.1.7 ABNORMALITIES OF DEVICES (Cont.)
Phenomenon
Outdoor Unit Propeller Fan is
Cooling or
Heating
Operation with
Abnormal
Sound
Sound from
Compressor
Outdoor Fan is
Not Operated
When
Compressor is
Operated.
Discharge Pressure Does Not
Indoor Fan is
Increase Higher than 1.5MPa
Not Operated
When
Compressor is
Operated.
*1): Refer to Item 16.6 of TC
Cause
Foreign Particles Inside of
Fan Casing
Indoor Unit Fan Runner is
Hitting Casing
Hitting Shroud
Faulty
Installation
Liquid Ref.
Compression
Abnormal
Wear or
Breakage of
Internal
Comp. Parts
No Heating
by Oil
Heater
Hamming Sound from
Magnetic Conductor
Abnormal Vibration of
Cabinets
Obstacle at Outdoor Fan
Watching Condition for
Heating Operation
due to insufficient refrigerant.
Disconnected Wiring for
Indoor Fan
TROUBLESHOOTING
Check Item
Check it by viewing.
Check it by viewing.
Check it by viewing.
Check each Part isTightly
Fixed
Adjust Suction Gas Temp.
and Pressure.
Abnormal Sound from
Inside of Compressor
Check Resistance (Oil
Heater, Fuse)
Check surface of contacts.
Check each fixing screws.
Check obstacles.
Wait for switching of
4-Way Valve.
(1 ~ 3 minutes)
Check operation pressure.
*1)
Check wiring.
1
17
Action
(Turn OFF main switch)
Remove foreign Particles.
Adjust position of fan
runner.
Adjust position of propeller
fan.
Tightly fix it.
Ensure superheat.
Replace compressor.
Replace oil heater or fuse.
Replace magnetic switch.
Tightly fix it.
Remove obstacles.
In case that 4-Way Valve is
not switched, check for
insufficient refrigerant.
Add refrigerant.
Connect wiring correctly.