Operation Manual; Special Remarks; Troubleshooting - Hitachi air core 600 Installation & Maintenance Manual

Special remarks

•
3-minute protection after the compressor stops
To protect compressor, the system implements a 3 minutes once operation is stopped.
•
5 minute-protection
Compressor must run for at least 5 minutes once operation starts. During the 5 minutes, compressor will not
stop even after set point is reached. The system will shut off if manually turned off using the remote controller.
•
Cooling operation
The fan of the indoor unit will never stop running in cooling operation. It continues to operate even if the
compressor stops working.
•
Heating operation
Heating capacity depends on external factors like outdoor unit temperature. Heating capacity might decrease
if outdoor ambient temperature is too low.
•
Anti-freezing function during cooling
When the air temperature from the indoor outlet is too low, the unit will run for some time
to avoid frost or ice forming on the indoor heat exchanger.
•
Cold air prevention
Within several minutes after the heating mode is selected, the fan of the indoor unit will not run until the heat
exchanger of the indoor unit reaches a certain temperature to prevent cold draft.
•
Defrosting
When the outdoor temperature is too low, ice may form on the outdoor heat exchanger, reducing heating
performance. When this happens, the defrost cycle of the system will start. During the defrost cycle, the indoor
unit fan stops (or runs at a very low speed in some cases), to prevent cold draft.
Once the defrost cycle is complete, heating operation and the fan speed resume.
•
Discharging the residual heating air
When stopping the air conditioner in normal operation, the fan motor will run with low speed for a while to
blow out the residual hot air.
•
Auto restart from power outage
When the power supply is recovered after power outage, all presets still be in effect and the system will
run according to the previous settings.

Troubleshooting

CAUTION
When drain water overflows from the indoor unit, stop the operation and contact your dealer.
When you smell or see white smoke coming out of the unit, turn OFF the main power supply and
contact your dealer.
1. If Trouble issue persists ...
If the trouble issue persists even after checking the following, contact qualified, licensed service provider，
and inform them of the following items.
(1) Unit Model Name
(2) Details of the issue
2. No Operation
Check if there's power and the unit is turned ON.
Check whether the SET TEMP is set at the correct temperature.
19

Operation Manual

under the fan mode,