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An air conditioner drain blockage alarm system which is designed for application to both horizontally and vertically-mounted heating and air conditioning units, which alarm includes in a preferred embodiment, both a normally open drain line liquid level switch and a normally closed drain pan liquid

An air conditioner drain blockage alarm system which is designed for application to both horizontally and vertically-mounted heating and air conditioning units, which alarm includes in a preferred embodiment, both a normally open drain line liquid level switch and a normally closed drain pan liquid level switch for sensing blockage of a drain line in both the drain line itself and in the condensate drain pan which collects condensate from the air conditioning unit. In addition to the drain line and drain pan liquid level switches, the system is characterized by an alarm which audibly indicates a high water condition in either the condensate drain pan or the drain line and a manual override switch for manually silencing the alarm. In a preferred embodiment, the system is wired through the existing thermostat in the heating and air conditioning unit to facilitate deactivating the air conditioning system by the drain pan liquid level switch when the condensate drain pan is subject to overflow.

대표청구항 ▼

An air conditioner drain blockage alarm for an air conditioning unit having a thermostat, a transformer for reducing the electric current and voltage applied to the thermostat, a drain pan for collecting water condensate and a drain line attached to the drain pan for draining the water from the drai

An air conditioner drain blockage alarm for an air conditioning unit having a thermostat, a transformer for reducing the electric current and voltage applied to the thermostat, a drain pan for collecting water condensate and a drain line attached to the drain pan for draining the water from the drain pan, said alarm comprising a normally open liquid level magnetic reed switch attached to the drain line in water-communication with the drain line, vent means provided in said normally open liquid level magnetic reed switch for venting air from said normally open liquid level magnetic reed switch and alarm means electrically connected to said normally open liquid level magnetic reed switch, whereby said alarm means is electrically activated when water fills said liquid level magnetic reed switch to a predetermined level responsive to blockage of the drain line and said normally open liquid level magnetic reed switch is closed, and a normally closed liquid level switch attached to said drain pan, said normally closed liquid level switch electrically connected to the thermostat and the transformer, whereby the thermostat is deactivated to terminate operation of the air conditioning unit when water rises to a predetermined level in the drain pan and opens said normally closed liquid level switch responsive to blockage of the drain line.