Apparatus and method for determining the state of an electrical

Details Apparatus and method for determining the state of an electrical Apparatus and method for determining the state of an electrical

1995-07-28

1997-07-15

Wieder, Kenneth A.

Electricity: measuring and testing

Electromechanical switching device

Thermostat switch

324418, 324500, 340644, G01R 3102

Patent

active

056487223

ABSTRACT:
An apparatus and method for determining the state of a switch for use in an HVAC system. The apparatus and method are advantageously configured for use within a heating, ventilation and air conditioning (HVAC) system, in which the sensing of the state of safety switches external to a controller is desirable. A current sensor coupled in series between a current source, a safety switch, and a current load, detects the flow of current from the current source and through the switch and load. A status signal, indicative of the flow of current through the current sensor, is generated for sampling by a microprocessor. The presence or absence of current flow through the current sensor provides an indication as to whether the remotely-located switch is in an open or closed state.

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