What Does Routine Maintenance Include?

In addition to making sure that your equipment is receiving adequate air circulation, routine service looks at the health of your entire heating and air conditioning unit, including all moving parts.

Electrical Relays

Electrical relays are designed to open and close a certain number of times with a particular current load before the contact points are damaged and relay require replacement. If more than the design current is passed through this relay due to a motor working too hard or low voltage conditions, the contact points overheat and become damaged. If the electrical contacts in a contactor (large relay) begin to get pitted, and the contactor is not replaced, eventually the air conditioner’s compressor motor or the fan motor controlled by the contactor will burn up and require replacement. Once again, if we exceed the design limitations of the device or its anticipated lifespan, additional damage is caused. It’s cheaper to replace a relay or contactor during a preventative maintenance. Certainly, it’s much less expensive than a full motor or compressor replacement!

Run Capacitor

A run capacitor uses the charge stored in the dielectric in order to boost the electrical current providing power to an electric motor. A lower rated start capacitor will decrease the motor’s RPM, increase motor amp draw, increase motor starting torque. An incorrectly rated capacitor will result in a shortened life of the motor, compressor, and the capacitor.


Bearings and other rotating parts are designed to have a useful lifespan of hundreds of thousands of hours, provided they are lubricated at appropriate intervals and are not overloaded due to vibration from defective drive belts or dirty blower wheels. If bearings are not lubricated regularly, they will overheat and eventually seize. When this occurs, the bearings fall apart, and the blower wheel, shaft, and housing are destroyed. This is a prime example of a situation where inexpensive preventative maintenance was neglected with catastrophic results.

Insufficient Refrigerant Charge

This can ruin a compressor in two ways: icing or overheating. The unit icing up due to a low-pressure condition causes the compressor to fail due to liquid slugging, as described in our earlier post. The second type of failure is due to the fact that the compressor requires a certain quantity of cool refrigerant vapor to cool its motor windings. If the refrigerant charge is not sufficient, the motor within the compressor will overheat and burn up. A preventive maintenance program would spot this condition and save you money.

Properly maintained air conditioning and heating equipment operates more efficiently consumes less energy and lasts longer.  Contact TBT HVAC to prolong the life of your heating and cooling systems