Hitachi air core 600 Installation & Maintenance Manual page 22

3. Not Cooling or Heating Properly
•
Check for obstruction of air flow in outdoor or indoor units.
•
Check if there are too many heating sources in the room.
•
Check if the air filter is clogged with dust.
•
Check if the doors or windows are open.
•
Check if the temperature condition is within the operation range.
4. This is Not Abnormal
•
Odor from Indoor Unit
Unpleasant odor diffuses from indoor unit after a long period of time. Clean the air filter and panels
or allow a good ventilation.
•
Sound from Deforming Parts
During system starting or stopping, a sound might be heard. However, this is due to thermal normal wear of
plastic parts. It is not abnormal.
•
Steam from Outdoor Heat Exchanger
During defrosting operation, ice on the outdoor heat exchanger melts resulting in steam.
•
Dew on Air Panel
When the cooling operation continues for a long period of time under high humidity conditions, dew may
form on the air panel.
•
Refrigerant Flow Sound
While the system is being started or stopped, the refrigerant flow sound may be heard.
•
Protection for First Heating Run
If the air conditioner is stored below 0℃ for a long time ,the unit might stop to protect the compressor when
running heating mode for the first time especially in the condition of long pipe, and it will restart after that.
It is not abnormal.
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Operation Manual