does ac contactor controll ac blower


Does AC Contactor Control AC Blower


When it comes to controlling the components of an air conditioning system, the AC contactor plays a crucial role. One such component that is often controlled by the AC contactor is the AC blower. But how does the AC contactor actually control the AC blower? In this article, we will delve into this topic and explore the functionalities and operations of both the AC contactor and the AC blower. By the end of this article, you will have a clear understanding of how these two components work in tandem to provide efficient cooling in an air conditioning system.

The AC Contactor: An Overview

The AC contactor is an electrical device that is responsible for controlling the flow of electrical current to various parts of the air conditioning system. It acts as a switch that allows or interrupts the current flow, depending on the control signals it receives. The AC contactor is an essential part of the system, ensuring that all components are supplied with the necessary power to function properly.

The AC contactor is typically located in the control panel of the air conditioning unit. It consists of a set of contacts, a coil, and an electromagnet. When a control signal is received, the coil of the contactor creates a magnetic field, which pulls the contacts together, allowing current to flow. Conversely, when the control signal is removed, the contacts separate, interrupting the current flow.

Understanding the AC Blower

The AC blower, also known as the air handler or fan, is responsible for circulating the conditioned air throughout the space being cooled. It is a critical component that ensures the proper distribution of cooled or heated air. The blower consists of a motor, a fan, and a series of blades or fins. The motor drives the fan, creating the necessary airflow within the system.

How the AC Contactor Controls the AC Blower

The AC contactor plays a vital role in controlling the AC blower. It acts as a switch that allows the blower motor to receive electrical power from the main power source. When the control signal is received by the contactor, it enables the flow of current to the blower motor, activating it. This, in turn, starts the fan, and the conditioned air is forced through the air ducts to cool or heat the desired area.

During operation, the AC contactor continuously monitors the control signal from the thermostat or the control board in the air conditioning unit. If the desired temperature is reached or the system is turned off, the control signal is removed. As a result, the AC contactor interrupts the current flow to the blower motor, deactivating the fan. This helps conserve energy and prevent unnecessary operation of the blower when not required.

The Significance of the AC Blower Control

The control of the AC blower by the AC contactor is vital for several reasons. First and foremost, it ensures that the blower operates only when necessary, preventing the unnecessary consumption of electricity. By controlling the blower, the AC contactor helps optimize the energy efficiency of the system, leading to cost savings and reduced environmental impact.

Furthermore, proper control of the AC blower enhances the overall comfort level in the cooled space. The blower distributes the conditioned air evenly, ensuring that all areas receive sufficient cooling or heating. By controlling the blower operation, the contactor maintains a consistent and comfortable indoor temperature, providing an enhanced experience for the occupants.

Factors Affecting AC Blower Control

While the AC contactor is responsible for controlling the AC blower, there are various factors that can affect this control. One such factor is the size and capacity of the blower motor. A larger blower motor may require a more robust contactor to handle the increased load. Therefore, it is essential to select a contactor that is compatible with the specific requirements of the blower motor.

Additionally, the control signals from the thermostat or control board must be accurate and reliable. Faulty or inconsistent control signals can lead to improper blower control, resulting in temperature fluctuations and reduced system performance. Regular maintenance and calibration of the control components are necessary to ensure accurate and consistent control of the blower.

The Role of Other Components

While the AC contactor is primarily responsible for controlling the AC blower, it is not the only component involved in this process. Other components, such as relays, limit switches, and control boards, work in conjunction with the contactor to ensure proper blower control.

Relays act as control devices that amplify and redirect electrical signals. They provide additional assistance to the contactor by strengthening the control signals and protecting the contactor and other components from excessive electrical loads.

Limit switches, on the other hand, function as safety devices that prevent the blower motor from overheating or operating under unfavorable conditions. They can shut down the blower motor if it exceeds safe temperature limits or encounters a malfunction.

Lastly, control boards are electronic circuit boards that receive and process control signals from the thermostat or other control devices. They relay the signals to the contactor and other components to enable or disable the blower motor as required.


The AC contactor acts as a crucial link between the power source and the AC blower motor. It controls the flow of electrical current to the blower, ensuring that it operates efficiently and only when needed. The contactor works in tandem with other components, such as relays, limit switches, and control boards, to provide reliable and accurate control of the blower motor.

Understanding how the AC contactor controls the AC blower helps us appreciate the intricate workings of an air conditioning system. By optimizing the control of the blower, we can achieve improved energy efficiency, comfort, and overall performance in our cooling systems. So, the next time you enjoy the cool breeze from your AC, remember the pivotal role played by the AC contactor in controlling the AC blower.


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