Importance

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Abstract

A drain tube that can be used, for example, in an air cooling system, includes an inlet end for attachment to the drain pan of the air handler, and an outlet end for transporting liquid out of the drain pan. A liquid sensor probe is located at least partially in the drain tube, and includes a probe end that extends from the drain tube inlet end into the drain pan when attached to the drain pan. The liquid sensor probe detects the undesired accumulation of liquid in the drain pan caused by a blockage in the drain pan, in the drain tube, or in any other portion of the drainage tubing. A control circuit generates an output signal when excess liquid is present at the probe end of the liquid sensor so as to sound an alarm and/or turn off the air cooling device. The outlet end of the drain tube can be attached to a first leg of a cross-shaped fitting. The cross-shaped fitting includes a second leg opposite to the first leg through which a cleaning device can access the first leg, the drain tube, and the drain pan. A U-shaped trap also can be attached to the cross-shaped fitting and can be cleaned by insertion of the cleaning device through the cross-shaped fitting and the U-shaped tube.

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First Claim