Refrigerator Troubleshooting Diagram

Commercial Air-Conditioning Systems Maintenance

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Before performing any maintenance on the unit, make sure the main line switch is open or in the OFF position. Label the switch so that someone will not turn it on while you are working.

The components should be checked and serviced as follows:

• Blower motor oil. According to the manufacturer’s recommendations, the rating plate will usually give lubrication instructions.

• Electrical connections. The electrical connections should be checked periodically and retightened.

• Pulley alignment and belt tension. Check the blower and motor pulley for alignment. Also check the belt for proper tension. It should have approximately 1 in. of sag under normal finger pressure.

• Blower bearings. Blowers are equipped with prelubricated bearings and need no lubrication. If, however, there are a blower unit and blower motor without sealed bearings, a few drops of oil must be added occasionally.

Condenser and evaporator coils. Coils should be inspected occasionally and cleaned as necessary. Be careful not to bend the soft aluminum fins.

• Filters. System air filters should be inspected every two months for clogging because of dirt. When necessary, replace disposable-type filters.

Special Instructions
• Do not rapid-cycle the unit. Allow at least 5 min before turning on the unit after it has shut oil.

• If a general power failure occurs, the electrical power supply should be turned off at the unit disconnect switch until the electrical power supply has been restored.

• Air filters should be cleaned or replaced at regular intervals to ensure against restricted airflow across the cooling coil.

• During the off season, the main power supply may be left on or turned off. Leaving the power turned on will keep the compressor crankcase heaters energized.

• If power has been off during the winter, it must be turned on for at least 12 h before spring start-up of the unit. This allows the crankcase heaters to vaporize any liquid refrigerant that may be condensed in the compressor.

Written by sam

February 7th, 2011 at 7:41 am

Posted in Air Conditioning

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