What is the minimum interlock setting on automatic changeover thermostats commonly called?

What is the minimum interlock setting on automatic changeover thermostats commonly called?

• A. Hysteresis
• B. Deadband
• C. Setpoint
• D. Threshold

Answer: (B)

The concept here is the intentional gap between heating and cooling calls in an automatic changeover thermostat. That gap, which keeps the system from switching both heating and cooling on at the same time, is called the deadband. It represents the minimum interlock setting between the heating and cooling setpoints, so when the room temperature falls to the heating point, heat turns on, and when it rises to the cooling point, cooling turns on. The deadband is what prevents rapid cycling and overlapping actions, keeping the system stable and efficient. While setpoint refers to the target temperature, and threshold is a generic trigger level, and hysteresis describes a broader on/off behavior, deadband is the precise term for this interlock gap in HVAC changeover systems.

The concept here is the intentional gap between heating and cooling calls in an automatic changeover thermostat. That gap, which keeps the system from switching both heating and cooling on at the same time, is called the deadband. It represents the minimum interlock setting between the heating and cooling setpoints, so when the room temperature falls to the heating point, heat turns on, and when it rises to the cooling point, cooling turns on. The deadband is what prevents rapid cycling and overlapping actions, keeping the system stable and efficient. While setpoint refers to the target temperature, and threshold is a generic trigger level, and hysteresis describes a broader on/off behavior, deadband is the precise term for this interlock gap in HVAC changeover systems.