Question 168Refrigeration & AC - Assistant Engineer

The correct answer is D) When checked with control power on and the thermistor probe connected into the circuit, the thermistor probe voltage drop should be 3.805 volts. This is correct because the illustrated chart (GS-RA-48) indicates that at a supply water temperature of 45°F, the thermistor probe voltage drop should be 3.805 volts when the control power is on and the probe is connected into the circuit. The other options are incorrect because option A assumes the control power is off, and options B and C do not match the voltage drop value indicated on the chart for a 45°F supply water temperature.