| 摘要 |
A condensate overflow safety switch that can be used with an air handling system is disclosed. The air-cooling system includes a drain pan for collecting liquid condensed on the evaporator coils. The drain pan is fluidwise connected to the safety switch that is in turn electrically connected to a circuit of the air handling system. To reduce the probability of an overflow from the drain pan arising from an occlusion to water liquid draining from the drain pan, an annular float is mounted about a tube in which is sealed a reed switch electrically connected to a circuit of the air handling system or to an alarm circuit. The float containing an annular magnet ascends or descends based on the level of water liquid within the structure. If a predetermined level of condensate liquid within the safety switch tubular structure exists, the float will have ascended such that the magnetic field of the annular magnet will cause a reed switch to open in the case of the air handling circuit, or to close in the case of an alarm circuit. Upon removal of the drainage occlusion, the water liquid level within the tubular structure will decrease below the predetermined level thereby causing the float to descend and the reed switch contacts to engage or to disengage, thereby rendering the circuit of the air handling system operative or alarm circuit inoperative, respectively. The disclosed condensate safety switch with its tubular structure, either T-shaped or L-shaped; is compact and easy to install, can be installed at any slope from horizontal to vertical and, by virtue of its sealed electrical components, is of heightened reliability in warning of drain line occlusions and/or preventing drain pan overflows.
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