TT terminals are primarily used for what purpose?

TT terminals are primarily utilized for thermostat connections in heating systems, particularly in oil heat applications. These terminals serve as the interface where the thermostat connects to the heating unit, allowing the thermostat to communicate the desired temperature settings to the system. When the temperature drops below the set point, the thermostat completes the circuit through the TT terminals, signaling the burner to ignite and heat the space to the desired temperature. This function is crucial for maintaining the efficiency and effectiveness of heating systems, as the proper regulation of temperature directly impacts the comfort of the environment being heated.

In an oil heating system, the reliability of the TT terminal connection ensures that the heating system operates at optimal levels, responding correctly to changes in temperature settings provided by the thermostat. Hence, understanding the purpose of TT terminals is vital for any technician involved in servicing or installing heating systems.