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Section 6
Maintenance
Preventive Maintenance Tasks
Check for proper defrosting
Clean the coil and drain pan
Check for proper drainage
Inspect /clean the coil if the air supply is near polluting sources (such as cooking
appliances)
Check/tighten all electrical connections
Check all wiring and insulators
Check contactor for proper operation and contact point deterioration
Tighten fan set screws, and motor mount nuts and bolts
For semi-hermetics, check the oil level in the system
Check the operation of the control system
Make certain all safety controls are operating properly
Check operation of the drain line heater and examine for cuts and abrasions
Check/tighten all mechanical/flare connections
Failure to keep the condenser coil clean will result in reduced airflow through the condenser, resulting in poor system
performance and premature compressor failure.
Polyol Ester (POE) Lubricants
• Polyol Ester (POE) lubricants quickly absorb moisture from the ambient surroundings.
• POE lubricants absorb moisture more rapidly and in greater quantity than conventional mineral oils.
• Because moisture levels greater than 100 PPM will result in system corrosion and component failure, it is essential
that system exposure to ambient conditions be kept to a minimum.
• If a system is left open to the atmosphere for more than 15 minutes, the liquid line drier and compressor oil must be
replaced.
• Drain at least 95% of the oil from the compressor suction port.
• Measure the amount of removed oil, and replace it with exactly the same amount of new POE oil.
• Mobil EAL™ ARCTIC 22 CC is the preferred Polyol Ester lubricant because of its particular additives.
• ICI Emkarate RL 32S is an acceptable alternative when the Mobil is not available.
• These POE lubricants must be used with HFC refrigerants.
• Lubricants are packaged in specially designed, sealed containers.
• Once opened, use the lubricant immediately.
• Properly dispose of any unused lubricant.
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