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AC Repair Killeen | CWS Services

Preventive Maintenance Services | CWS Services

Everything of value requires some kind of preventive maintenance to keep the item running properly, looking good and extend its life. There are many many reasons why you need preventive maintenance.

Preventive Maintenance for Heating and Cooling

When it comes to your HVAC, heating and cooling system, preventive maintenance services is the key to ensuring you get all the years out of the warranty. Preventive maintenance or service is essential to the proper functioning of air conditioning and heating equipment. If preventive maintenance is not performed regularly or if it is done haphazardly, the equipment will require extensive and costly repairs at a later date that is sooner than it should be. Preventive maintenance means spend a little now to avoid spending a lot later. CWS Services offers preventive maintenance programs to help you get the most from your heating and cooling system. A proper preventive maintenance program involves regular inspections of your equipment.

Changing the system filter and or filters is an important step to ensuring your heating and cooling system is working properly. Air conditioning equipment is designed to operate with a specific quantity of air passing over its indoor coil surface. When air filters are not replaced, they clog and become coated with dirt. Similarly, the indoor coils get coated with dirt. This dirt reduces the amount of air through the unit below the design limit, leading to catastrophic failure.
In the cooling mode, if there is not enough air over the indoor coil, the coil temperature drops. When it drops below the freezing point, ice forms on the coil, which further reduces the airflow, which further reduces the coil temperature. The compressor within the unit is a pump, which is designed to pump a vapor. As the airflow through the indoor coil drops, there isn’t enough heat being removed from the air passing over the coil to vaporize the liquid refrigerant inside the coil. Thus, instead of receiving a vapor, the compressor receives liquid refrigerant. This is called “liquid slugging”. The effect of “liquid slugging” is similar to the effect of pouring liquid into the cylinders of a gas engine. As liquids are not compressible, cylinder pressure exceeds the design limits of the cylinder, and the valves, connecting rods, pistons, or other internal components are destroyed.

In the heating mode, low airflow causes the heat ex-changer to overheat. Heat ex-changers are designed to operate at temperature between 120°F and 200°F. At higher temperatures, the heat ex-changer oxidizes, its life-span is reduced, or it cracks and breaks. In either case, It makes far more sense to replace air filters regularly than to replace a heat ex-changer costing far more.