초록 ▼

The microprocessor-based HVAC control system detects sensor faults by comparing thermistor readings with predetermined extreme values, indicative of sensor fault. The system automatically selects the appropriate combination of automatic/preset modes of operating key system components such as the exp

The microprocessor-based HVAC control system detects sensor faults by comparing thermistor readings with predetermined extreme values, indicative of sensor fault. The system automatically selects the appropriate combination of automatic/preset modes of operating key system components such as the expansion valve, the demand defrost system and the indoor fan speed control system. With a view towards minimizing any negative impact on system performance and reliability in the event of sensor malfunction.

대표청구항 ▼

In a heat pump system including a refrigerant compressor and an electrically controlled expansion valve, a system operating method comprising, obtaining a discharge temperature by measuring a property indicative of the temperature of refrigerant discharged from the compressor; comparing the discharg

In a heat pump system including a refrigerant compressor and an electrically controlled expansion valve, a system operating method comprising, obtaining a discharge temperature by measuring a property indicative of the temperature of refrigerant discharged from the compressor; comparing the discharge temperature with a predetermined temperature indicative of an alert condition; based on said comparing step: (a) if the discharge temperature is above said predetermined temperature, using the discharge temperature to control the setting of said expansion valve, and (b) if the discharge temperature is not above said predetermined temperature, setting said expansion valve to a predetermined setting.