Basic Troubleshooting - Hitachi RASC-HNPE CENTRIFUGAL VRF Series Installation And Operation Manual

Basic troubleshooting

7 BASIC TROUBLESHOOTING
C A U T I O N
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This is not abnormal
• Sound from deforming Part
During system starting or stopping, and abrading sound
might be heard. However, this is due to thermal deformation
of plastic parts. It is not abnormal.
• Refrigerant Flow Sound
While the system is being started or stopping, sound from
• Smells from Indoor Unit
Smell adheres on indoor unit after a long period of time.
• Steam from RASC Heat Exchanger
During defrosting operation, ice on the RASC heat
exchanger is melted, resulting in making steam.
• Dew on Air Panel
When the cooling operation continues for a long period
of time under high humidity conditions (higher than 27°C
DB/80% R.H.), dew can form on the air panel.
• Dew on Cabinet
When the cooling operation continues for a long period of
time (higher than 27°C DB/80% R.H.), dew can form on the
cabinet.
• Sound for the indoor unit heat exchanger
During the cooling operation, a sound may be heard from the
indoor unit heat exchanger due to water freezing or melting.
4 PMML0319A rev.1 - 06/2015
No operation
Check whether the SET TEMPERATURE is set at the correct
temperature.
Not cooling well or heating well
units.
Check if too much heat source exists in the room.
Check to see if the doors or windows are opened or not.
Check if the temperature condition is not within the
operating range.
Abnormal swing louver's position
Check if the four louver's position at the air outlet are in same
position.
If trouble still remains...
If the trouble still remains even after checking the above items,
contact your service contractor and inform the following data:
Unit Model Name
Content of Trouble
Alarm Code no. on Liquid Crystal Display
N O T E