Blockage detector with separate alarm and shut-off functions

Abstract

A blockage detector initially sounds an alarm while permitting the air cooling system to continue to operate when a first level of liquid is detected within the drain pan of an air cooling system. The blockage detector will turn off the air cooling system when a second level of liquid, which is greater than the first level of liquid, is detected in the drain pan of the air cooling system. This enables the resident(s) of the building (which could be a single family-dwelling or a multiple-family dwelling, such as an apartment building) to contact a technician to correct the blockage condition before the air-cooling system is turned off. If the alarm is not detected, or if the blockage is not eliminated quickly enough, the detector will turn off the air cooling system before water overflows from the drain pan and causes water damage to the building.

Dependencies are inferred from the claim text.