Emerson SmartCabinet User Manual page 94

90 Chapter 7 Maintenance
Note
All circuit boards are not hot-pluggable. Big instant current will be produced when the board is plugged or unplugged with
powering on and it may lead to unrepairable damage to the circuit. The control board can only be maintained after the
micro-processing controller is powered off.
2. Indoor unit maintenance
1) Fan
Since the fan kit operates 24 hours every day continuously, any unusual airflow obstruction must be cleared in time to
avoid the damage to the cooling system and other system components caused by reduced air volume.
2) Drain pipe
Inspect water pan periodically for normal operation of the drain pipe. Ensure that no foreign matter or leakage exits in
the drain pipe.
3. Outdoor unit maintenance
1) Refrigeration system
The components of the refrigerant system should be inspected monthly for finding abnormal operation phenomenon
in time. Refrigerant pipes must be properly fixed and not allowed to vibrate against wall, floor or the unit frame.
Inspect all refrigerant pipes every six months for signs of wear.
2) Air-cooled condenser
When the airflow through the outdoor unit is restricted, use compressed air or fin cleaner (alkalescence) to clean the
condenser off the dust and debris that inhibit airflow. The compressed air should be blown at the reversed airflow
direction. In winter, do not let snow to accumulate around the side or underneath the condenser. Check for bent or
damaged fins and simply repair them if necessary. Check all refrigerant pipes and capillaries for vibration and support
them if necessary. Carefully inspect all refrigerant pipes for signs of oil leakage, thus determining the leakage
position.
3) Compressor
The compressor fault is generally classified into two types:
Motor fault (such as winding burnout, insulation failure, short-circuit between coils and so on).
Mechanical fault (such as compressing failure, relief valve fault, therm-o-disc fault and so on).
If the operation pressure is not established, it indicates that the compressor has failed. It can be confirmed if the
suction pressure and discharge pressure are balanced and the motor does not rotate reversely.
The controller has powerful alarm and protection functions to ensure safe operation of the compressor. The
maintenance personnel should record the high pressure and low pressure and find out the cause of an alarm
protection during periodical maintenance and inspection.
Note
1. Avoid touching or contacting the residual gas and oils in compressor with exposed skin. Wear long rubber gloves to handle
contaminated parts.
2. System contains refrigerant. Reclaim the refrigerant using standard reclaiming equipment before maintenance. Release of
refrigerant to the atmosphere is harmful to the environment. Refrigerant must be recycled in accordance with state and local
regulations.
4. Maintenance inspection checklist
Note
Regular inspections are necessary to ensure proper operation of the AC unit.
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