The safety switch heater is removed from the circuit when what happens?

The safety switch in a heating system is designed to ensure safe operation by monitoring critical conditions. It typically functions to prevent potentially hazardous situations, such as overheating or flame loss, from occurring.

When the hot contacts are closed, this generally indicates that the switch is in a position allowing current to flow, maintaining the function of the heater. In contrast, the safety switch will remove itself from the circuit, cutting off power, especially when specific safety conditions are not met—such as when the flame goes out or the system overheats. Thus, in a correctly functioning system, the closure of the hot contacts indicates that everything is operational and within safe parameters, allowing the system to run normally.

Removing the safety switch when the hot contacts are closed indicates that the system is safely operating, thus preventing any active heat generation in unsafe conditions. This understanding assists in maintaining safe operational practices in HVAC systems.