the fan blade does physically interfere with other components. Ensure that the air discharge path is
free from any obstacles to the airflow.
• If the EC fan does not rotate, check the analog signal cable, rotating speed feedback cable, power
module power cable, and the power module.
• Do not operate the fan during maintenance to avoid injury to the operator or damage to the fan
blades.
• During the unit operation, do not touch the fan cover as the fan rotation may cause mechanical
damage.
7.12 Cooling System Maintenance
The cooling system components must be inspected monthly for abnormalities in the operation which can
cause abrasions due to continuous operation. As the failure or damage of components is usually
accompanied by corresponding faults, check regularly to prevent system faults.
The surface of the evaporator coil should be kept clean and have no rupture.
The major reasons for electronic expansion valve failure are related to electrical failure and/or mechanical
failure. The electrical failure may be attributed to the failure of the power supply of the electronic
expansion valve control panel and coil, loosely connected control board wiring, and pressure and
temperature sensor failure. The mechanical failure may be caused by blockage in the refrigerant flow in an
electronic expansion valve. Therefore, when the electronic expansion valve is faulty, pay close attention to
the control panel power supply, control board wiring, pressure and temperature sensor wiring or the valve
itself.
NOTES:
• It is not recommended to adjust the electronic expansion valve without prior permissions.
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