The low water cut off alarm is typically found in which circuit?

The low water cut-off alarm is primarily part of the auxiliary control circuit. This circuit is designed to monitor and provide alerts for conditions that may not directly control the primary operation of the system but are critical for safe and efficient operation.

The low water cut-off serves as a safety feature that prevents the boiler from operating with insufficient water levels, which could lead to overheating and potential damage. When the water level drops below a certain point, the low water cut-off activates the alarm, signaling that corrective action is required.

The operating control circuit is responsible for the basic functions of the heating system, while the safety control circuit encompasses critical safety interlocks that shut down the system in unsafe conditions. The high limit control circuit is specifically designed to protect against excessive temperature conditions. Thus, while those circuits play important roles, the specific function of the low water cut-off and its associated alarm fit best within the auxiliary control circuit, which is intended to enhance the overall safety and reliability of the system.