What is a common voltage range for low voltage HVAC control systems?

The common voltage range for low voltage HVAC control systems is 24 volts AC. This voltage is widely used in HVAC applications for thermostat control, system interlocks, and various control devices.

Using 24 volts AC allows for safer operation, as lower voltages are generally less hazardous and easier to work with than higher voltages. It also minimizes the risk of electric shock to technicians during maintenance. Additionally, this voltage is highly effective for providing adequate control signals for various components like relays and actuators in HVAC systems, allowing for reliable operation without the complications that would arise from using higher voltages.

Moreover, 24 volts AC systems are compatible with most commercial and residential HVAC equipment, standardizing installation and maintenance procedures across many types of systems. In contrast, the other voltage options listed, such as 120 volts AC, 240 volts AC, and 48 volts AC, are not typically utilized in low voltage control applications within HVAC systems.