If the outdoor temperature is 52 degrees, what voltage value would be sensed at the defrost board terminals of the outdoor temperature sensor?

When considering the operation of an air-to-air heat pump and the role of the outdoor temperature sensor in conjunction with the defrost board, the sensed voltage at the board terminals is derived from the resistance of the temperature sensor, which changes with the outdoor temperature.

At an outdoor temperature of 52 degrees Fahrenheit, the temperature sensor outputs a specific voltage value that correlates with that temperature. The value of 0.98 VDC is representative of the sensor's typical behavior at this temperature, as lower voltages often correspond to lower temperatures based on the sensor's characteristics.

Given that the sensor is calibrated to provide a specific output voltage based on its temperature reading, the 0.98 VDC value suggests that the sensor is functioning properly and accurately reflecting the outdoor temperature conditions. This makes it the correct choice in this context since it aligns with the expected output range for the temperature being measured.

Understanding this principle of electronic temperature measurement helps in troubleshooting and evaluating heat pump performance, especially in maintaining optimal efficiency and ensuring proper defrost cycles during operation.