The Usual Suspects
2. Exploring the Different Controllers
Okay, so we know there’s a controller, but what kind? Let’s look at a few of the frontrunners.
Electromechanical Relays: These are the old-school workhorses of AC control. They use electrical current to open and close circuits, turning components on and off. While reliable, they are less precise than more modern options and tend to be found in older units. Think of them as the AC equivalent of a rotary phone — they get the job done, but they’re not exactly cutting-edge.
Electronic Control Boards: Now we’re talking! These circuit boards are the brains of many modern AC units. They use microprocessors to manage all aspects of the cooling cycle, from temperature control to fan speed. They can also incorporate safety features like overload protection. They’re much more energy efficient than electromechanical relays and offer greater precision.
Thermostats: While technically not the sole controller, the thermostat plays a vital role. It senses the room temperature and sends signals to the main controller to adjust the cooling output. It’s the interface you, the user, interact with most often. From simple dial thermostats to sophisticated smart thermostats, they all serve the same purpose: telling the AC when to kick in (or take a break).
Inverter Technology Controllers: Found in newer, high-efficiency AC units, these controllers regulate the speed of the compressor. Instead of simply turning the compressor on and off, they can adjust its speed to match the cooling demand. This results in more consistent temperatures, lower energy consumption, and quieter operation. It’s like having cruise control for your AC!