What function does a water level detection device provide if the primary drain is blocked?

A water level detection device serves a crucial safety function in HVAC systems, particularly by monitoring the water level in a collection pan or drain line. If the primary drain becomes blocked, the device is designed to detect the rising water level, which could lead to potential flooding or water damage.

By shutting off the equipment, the device prevents the continuation of any processes that could exacerbate the water accumulation problem, such as heating or cooling operations that would cause more condensation or water generation. This proactive measure protects the overall system from operational failure and reduces the risk of water damage to the surrounding environment.

Furthermore, while certain devices might perform functions such as notifying users or activating alarms, the primary and most immediate action taken in response to a blockage is typically to shut down the equipment to prevent complications. This makes the function of shutting off the equipment a vital safety feature in mechanical systems governed by code requirements.