Heating and cooling system monitoring apparatus

Details Heating and cooling system monitoring apparatus Heating and cooling system monitoring apparatus

1983-03-03

1985-11-26

Tanner, Harry

Automatic temperature and humidity regulation

Thermostatic

With indicator or alarm

62127, G05D 2300

Patent

active

045550573

ABSTRACT:
Apparatus for indicating if any one of a plurality of sensors detects a malfunction in a heating and cooling system. In response to a sensor detecting a malfunction, a local alarm coupled thereto, a common alarm coupled to all sensors, and a telephone dialing and message conveying device are activated. Signals provided by each sensor to a single coil that activates the common alarm and the dialing and message conveying device are prevented from being conveyed to a local alarm coupled to another sensor by including the coil in a rectifier bridge arrangement. If a malfunction corrects itself or is corrected, the local alarms and common alarm are switched off and reset to permit indication of a subsequent malfunction. The dialing and message conveying device, local alarms, and common alarm can be selectively inhibited. In the event of failure of a primary a.c. power source, a d.c. source is automatically activated to provide power.

REFERENCES:
patent: 3986560 (1976-10-01), Heath et al.
patent: 4387368 (1983-06-01), Day, III et al.
patent: 4387578 (1983-06-01), Paddock
patent: 4412211 (1983-10-01), Lautzenheiser et al.

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