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How Does the AC Turn On and Off?

Published in Air Conditioning Basics 2 mins read

The air conditioner (AC) is turned on and off by the thermostat.

The Role of the Thermostat

The thermostat is the primary control for your AC system. It functions by:

  • Sensing Room Temperature: The thermostat constantly monitors the ambient temperature of the room.
  • User-Defined Settings: Users set the desired temperature on the thermostat.
  • Signaling the AC: When the room temperature exceeds the set temperature, the thermostat sends a signal to the AC unit to turn on. Conversely, it signals the AC to turn off when the desired temperature is reached.

Potential Issues

According to the reference, issues with the thermostat can lead to problems:

  • Faulty Wiring: If the wiring between the AC and the thermostat is faulty, the AC may not receive the correct signals, causing it to turn on and off erratically, a process known as "short cycling."
  • Miscalibrated Thermostat: If the thermostat is not accurately reading the temperature, it could cause the AC to turn on and off at the wrong times, including too frequently.

How It Works

Here's a breakdown:

  1. Temperature Rise: When the room temperature rises above the set temperature on the thermostat, the thermostat activates.
  2. Signal Transmission: The thermostat sends an electrical signal to the AC unit.
  3. AC Activation: The AC unit starts its cooling process by engaging the compressor and fans.
  4. Temperature Drop: As the AC cools the air, the room temperature starts to drop.
  5. Desired Temperature Reached: Once the room temperature reaches the temperature set on the thermostat, it signals the AC to turn off.
  6. Cycle Repeats: This on/off cycle repeats as needed to maintain the desired room temperature.
Component Function
Thermostat Senses temperature, signals AC to turn on/off
Wiring Connects the thermostat to AC
AC Unit Cools the air

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