Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-12-29
1995-08-22
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340584, 236 94, 165 111, G08B 2100
Patent
active
054444365
ABSTRACT:
A new and improved failure alarm apparatus is provided for a furnace and an air conditioner which selectively, alternately share a common thermostat. The furnace and air conditioner failure alarm apparatus includes a battery power supply for powering electrical circuits in case of AC power failure. A first sensor assembly circuit monitors thermostat status and is connected to a thermostat on a neutral wire (white wire) connected to the thermostat. Each of a second and third sensor assembly includes a respective temperature sensor and a respective temperature sensor circuit. A second temperature sensor is placed adjacent to an air duct outlet. In addition, a third temperature sensor (an environmental temperature sensor) is housed in the furnace and air conditioner failure assembly housing where the signal processing an alarm circuitry are housed. A signal processing assembly receives signals from the sensor circuit assemblies and processes the signals, and an alarm circuit assembly is connected to the signal processing assembly for providing an alarm when the signal processing assembly indicates an alarm condition. The air duct outlet is a register. The signal processing assembly may be connected to a home security alarm system. The first sensor assembly includes an electric voltage sensor. The electric voltage sensor is a 74121 one-shot multivibrator or monostable multivibrator. The second and third sensor assemblies include temperature sensors. The temperature sensors include thermistors. A power failure alarm assembly is connected to the battery power supply, for providing an alarm in the event of an AC power failure.
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