AirStage AO54FJ, Service Manual

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Estimated details Estimated details :
1.EV 1.EV – – KIT (Open excessively) 4. Normal Function KIT (Open excessively) 4. Normal Function
2.Installed piping 2.Installed piping 1) Refrigerant flow sound 1) Refrigerant flow sound
3.Indoor unit 3.Indoor unit 2) Defrost operation 2) Defrost operation
1)Installation 1)Installation
2)FAN & FAN MOTOR 2)FAN & FAN MOTOR
Check Point 1: EV - KIT (Open excessively) Check Point 1: EV - KIT (Open excessively)
When the EV-kit Valve is open excessively, other indoor units
may not operate at full capacity or a loud refrigerant rushing
sound may be generated.
Turn off the power source of PCB of the indoor unit to initialize
the EV-KIT for several times.
Put 3 minute interval between each initializations. The EV-KIT
VALVE may return to normal.
Check EV-KIT (SERVICE INFORMATION)
6. ABNORMAL SOUND IS
HEARD FROM INDOOR UNIT
Check Point 2: Check Point 2: Installed piping Installed piping
When the liquid Pipe diameter is large, a refrigerant rushing
sound will be generated and when the diameter is small,
capacity will be insufficient.
Check the design of piping installation
Check Point 3 Check Point 3 - - 1: 1: Installation Installation
Check if sound will stop, when touch the unit by the hand.
Check installation of indoor unit.
Check the grill contact with the chassis.
Check Point 3 Check Point 3 - - 2: 2: FAN & FAN MOTOR FAN & FAN MOTOR
Check contact of casing with a fan.
Check the contact of the shaft of the fan.
Normal Function Normal Function : : Refrigerant flow sound Refrigerant flow sound
During operation and immediately after stopping the unit, the sound of water flowing in the air conditioners
piping may be heard. Also, noise may be particularly noticeable for about 2 to3 minutes after starting
operation (Sound of refrigerant flowing)
Normal Function Normal Function : : Defrost operation sound Defrost operation sound
During heating operating, a sizzling sound may be heard occasionally. This sound is defrost operation.
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