Air Conditioning

PLANNED MAINTENANCE ITEMS PERFORMED:

Check thermostat calibration. Inaccurate thermostats affect comfort and operating costs.

Replace air filters or air cleaner media. Clean filtering media prevents coil clogging and compressor damage. It also ensures adequate airflow for comfort and improved air quality within the occupied space.

Check evaporator & condenser coils for excessive dirt accumulation. A clean evaporator coil is essential for proper system capacity and comfort. A dirty coil will cause the same damage to the system as a dirty air filter. A clean condenser coil is necessary for proper condensing temperature and affects capacity levels and system efficiency. A clogged coil will destroy the compressor and overload the condenser fan motor.

Disassemble outdoor unit & wash dirty condenser coils, if necessary. This will usually necessitate an additional cost to the Planned Maintenance Agreement.

Check blower & condenser motor brackets for breaks or cracks. Vibration and unbalance can weaken and break brackets causing damage to coils and the surrounding area.

Check setscrews on fan & blower wheels for tightness and centered in housing. Setscrews sometimes work loose and cause misalignment resulting in poor airflow and eventually damage to the fan or blower.

Check blower wheels for excessive dirt; wash blower wheel and housing if necessary. Dirt builds up in the blower wheel vanes and restricts airflow, causing poor efficiency in the system.

Check refrigerant charge, pressures, and temperatures. An incorrect refrigerant charge can easily go unnoticed and increase operating costs. More significantly, an improper charge will damage the compressor.

Check superheat and sub-cooling. Accurate diagnostic tests allow fine-tuning of your system. They also will indicate potential problems, which can be eliminated. Records are kept of your systems history.

Check compressor terminals for overheating due to lost continuity. A damaged compressor terminal usually requires compressor replacement. This may be avoided if caught in time.

Inspect controls and safeties for proper operation. Controls and safeties that do not function properly can increase operation cost and cause other components to fail.

Check compressor contactor contacts for pitting or burning. Manufacturers claim this condition is the leading cause of compressor failure in three phase compressors. Timely replacement can avoid compressor failure.

Lubricate motors and bearings if applicable. Motor life can be extended with proper lubrication.

Check for burned wires & terminals. In time, some wires & terminals lose continuity and overheat.

Check and tighten electrical connections. Loose connections cause wire overheating which can cause compressor or motor failure and frequently causes fires.

Check condensate drain for blockages. Clogged drains result in overflowing, which causes damage to equipment and building.

Inspect the exterior of equipment and replace any missing screws to prevent air leakage. As much as 25% of conditioned air can escape due to improperly fitted or secured access panels.

Check defrost controls & auxiliary heaters in heat pumps. Faulty defrost controls can damage coils & compressors and go unnoticed until shocking electric bills come.

Check system overall operation.