Abstract: An integrated HVACR control and protection system includes a modular and reprogrammable design providing a plurality of possible combinations of power detection, voltage detection, run current detection, transient current detection, temperature detection, universal thermostat interface, peripheral or remote control, and local display and control. The control and protection system is capable of evaluating the relationship between real power used by an HVACR system compressor and other system operating parameters to detect problems early in the failure cycle, i.e., before a failure has progressed to requiring a system shutdown or causing damage to other components. Additionally, a control system and method provide sensorless detection of various HVACR system faults, such as, for example, loss of refrigerant or a refrigerant flow restriction, that impact the relationship between real power and current, voltage, temperature, or other operating parameters.

Abstract: An integrated HVACR control and protection system includes a modular and reprogrammable design providing a plurality of possible combinations of power detection, voltage detection, run current detection, transient current detection, temperature detection, universal thermostat interface, peripheral or remote control, and local display and control. The control and protection system is capable of evaluating the relationship between real power used by an HVACR system compressor and other system operating parameters to detect problems early in the failure cycle, i.e., before a failure has progressed to requiring a system shutdown or causing damage to other components. Additionally, a control system and method provide sensorless detection of various HVACR system faults, such as, for example, loss of refrigerant or a refrigerant flow restriction, that impact the relationship between real power and current, voltage, temperature, or other operating parameters.

Abstract: A liquid level monitoring system for detecting high liquid levels in a wastewater handling system, includes wireless sensor modules, a wireless network, and a processor system. Individual sensor modules are battery powered and may be located at various points in the wastewater handling system, for example, at access openings such as those provided by a manhole cover. Each sensor module includes a capacitive probe, a capacitive sensing alarm circuit, and a wireless communication device. In the event the capacitive probe depending downward from the sensor module is submerged in liquid, the alarm circuit detects the high water level and activates the wireless communication device, thus transmitting an event message to the wireless network, which in turn transmits the event message to the processing system. The processing system includes a database that stores sensor module identifiers and installed sensor module locations.