CONVEYING TEMPERATURE INFORMATION IN A CONTROLLED VARIABLE SPEED HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) SYSTEM

摘要

Methods and apparatuses that support the transfer of data from a thermostat unit (100) to a ontroller unit to control a variable speed heating, ventilation, and air conditioning (HVAC) system are disclosed. The duty cycle of a signal that is sent from a thermostat unit (100) to a controller unit is adjusted in accordance with a temperature difference between the ambient temperature of an nvironmentally controlled space and a set temperature, and the controller unit (300) measures the duty ycle to determine the temperature difference and adjusts the speed of a blower motor or compressor in accordance with the temperature difference. The signal is switched on and off, in which the AC waveform is conducted and blocked by the thermostat unit (100) signal, determines the temperature from the duty cycle, and adjusts the speed from a predetermined relationship.