Video Transcript:

All those central air conditioners differ from model to model. They operate on similar principles. In this video we will address how central air conditioners work as well as potential problems you may encounter.

Included among the components that make up a central air system is a condensing unit which is located outside the home? The condensing unit contains the air conditioner condenser coils the compressor and the condenser fan motor. The evaporator coils or cooling coils are located inside the home and are mounted on top of a furnace or air handler. The furnace or air handler uses a circulation blower fan to draw air through the return vent blow at past the evaporator coils and force the air through the home’s venting.

The room air is then drawn back through the return and the airflow cycle continues. Once the room air has cooled sufficiently. The wall thermostat signals the circulation blower fan and condensing unit to turn off until the room temperature increases.

This process can be broken down into three main factors temperature control cooling and air circulation. The temperature in the home is regulated by the wall thermostat. The thermostat can be powered by the furnace control board or by batteries. The thermostat must be in a central location in the home positioned at eye level and away from direct sunlight for proper temperature regulation.

When the thermostat detects an increase in temperature it closes the cooling circuit allowing voltage to travel to the control board. The control board uses a time sequence to send 120 volts of alternating current to the circulation blower fan motor in the furnace and 24 volts to the condensing unit contact her, when the condensing unit contractor is energized.

It allows 240 volts to flow through a nearby disconnect box to the compressor and condenser fan motor. The disconnect box which provides a way to turn off power to the condensing unit outside includes a cartridge which may contain fuses. If the compressor and condenser fan motor fail to work. The disconnect box fuses can be tested for continuity to determine if a continuous electrical path is present.

The compressor acts as a pump compressing refrigerant in gas form into the condenser coils where the gas is condensed into a hot liquid the condenser coils dissipate the heat as the liquid travels through them and a fan is used to assist the coils in this process. Once the refrigerant has passed through the condenser coils. It travels to the evaporator coils located on the furnace or air handler as the refrigerant liquid enters the coils it expands into a gas which makes the coils cold.

The gas flows through the coils to a suction line attached to the compressor. The compressor converts the gas back into a liquid and the cooling cycle continues. The humidity in the air condenses on the cold evaporator coils and drips down into a set of collection trays the trays are attached to either a condensate pump or a floor drain.

It’s important to keep the condenser clean if leaves or other debris clogged the coils. The heat will not be dissipated properly and the system will not function efficiently. You can use a garden hose to clean the condenser by spraying the coils from the inside out.

The most important factor in efficient operation is airflow to ensure proper airflow. The air filter should be checked monthly and replaced as needed. There are several types of filters available and range from one to five inches thick. The filter can be installed into the slot in the return or in an air cleaner. Some homes will have an electronic air filter which is powered by the furnace or air handler control board. When the circulation blower fan turns on.

The blower fan motor can run at multiple speeds to improve efficiency, lower speeds are used when the furnace is heating and higher speeds are used for air conditioning.

If the circulation blower fan becomes noisy during use the set screw on the blower wheel may have loosened causing the wheel to wobble on the motor Shaft. You can fix this problem by tightening or replacing the screw or replacing the blower wheel altogether. Repair clinic has a solution for many of the problems you may be experiencing with your central air system. To find a complete list of compatible parts you should enter the appropriate model number in our website search engine.

Keep in mind that the condensing unit and furnace will have separate model numbers to find parts such as the circulation blower fan motor or control board. You will need to enter the furnace model number to find a contractor or condenser fan motor. The model number found on the condensing unit will be required.

Our site also has an extensive selection of instructional videos to assist you covering topics like part testing disassembly and part replacement at repair clinic.We make fixing things easy.

Some Frequently Asked Questions

The air conditioner in a central heating and cooling system provides cool air through ductwork inside your home, by providing a process that draws out the warm air inside, removing its heat. From that point, the condenser or outdoor unit then turns the refrigerant vapor back into a liquid, removing any heat.
about 15 to 20 years
The standards do not require you to change your existing central air conditioning units, and replacement parts and services should still be available for your home’s systems. The “lifespan” of a central air conditioner is about 15 to 20 years.
An air conditioning breakdown

Fans in the home blow air across the evaporator’s coils. “As air from the house moves across the evaporator, refrigerant within the coil picks up the temperature of the air,” said Hourahan. “The refrigerant is absorbing heat from the air and turns from a liquid to a vapor.

Condenser, Compressor And Evaporator

Evaporator (in the indoor unit of a split air conditioner): It is a heat exchanger coil that takes heat from the room and moves it outside. The heat is absorbed by the refrigerant and in turn, the air inside the room becomes cool.

On average, expect to pay between $1,500 and $4,000 for a central air conditioner. However, the price varies greatly depending on your needs. And installation costs can make the price soar quickly. To get an accurate idea of what you’ll spend, determine the size of the unit you’ll need.

How Often Should I Replace My Air Conditioner? According to Energy Star, you should consider replacing your AC when it’s over 10 years old. So in a perfect world, you should only have to replace your A/C once every 10—maybe 15—years.

So while your unit might make more noise initially cooling a space down from 80 to 75 degrees, running all day at a less powerful speed requires more energy overall. They’re also better at dehumidifying your house when going at full blast.

On average, expect to pay between $1,500 and $4,000 for a central air conditioner. However, the price varies greatly depending on your needs. And installation costs can make the price soar quickly. To get an accurate idea of what you’ll spend, determine the size of the unit you’ll need.
Do-It-Yourself Central Air Conditioning Installation. You should not handle A/C refrigerants unless you are certified to do so. But you can cut costs out of your installation by setting up the condenser and evaporator coils and running the connecting lines yourself.
ductless heat pump or air conditioner typically consists of a wall-mounted indoor unit combined with an outside compressor. It’s most often used in a situation where a window AC unit or baseboard heating would be considered, such as a new addition to a house.

*The information above does not constitute legal advice or opinion, nor is it a substitute for the professional judgment of a qualified attorney.