21 point Preventative Maintenance Checkup
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- Check refrigerant pressures and look for visible oil leaks around condenser and evap coil
- Calculate sub-cooling and superheat in the system.
- Check motor and pulleys, lubricate bearings on blower shafts if needed.
- If the motor has grease cert, add grease to bearings.
- Ensure bearings have no side to side play and smooth rotation.
- Check belts for wear, cracks or fraying. Align belts and pulleys as needed along with tension belts.
- Measure motor amperages on compressor, condenser fan motor and blower motor.
- Verify proper CFM settings on variable speed blower motors and condenser fan motors.
- Check compressor terminals and electrical connections and tighten connections if needed.
- Check contractor contacts for pitting or signs of overheating.
- Inspect disconnect box for damage or signs of overheating.
- Check expansion valves and bulbs.
- Measure evaporator temperature drop: make adjustments for optimal cooling performance.
- Clear condensate drains secure drain lines and verify proper termination point.
- Inspect safety shut off switch and condensate drains.
- Check and verify operation of pressure switches and safety devices for compressor and air handler
- Measure capacitance of capacitors.
- Washing condensing coil.
- Check air filters. Wash permanent filters.
- Check thermostat settings, temperature display and programming.
- Check supply and return temperatures
- Cycle equipment at the thermostat.
- Check overall operation and make adjustments necessary for the maximum efficiency of air conditioning equipment
