You are checking the supply chilled water...

Question 1 / 2066636eee28f7522a1c51e634

Question 1 of 2066636eee28f7522a1c51e634

You are checking the supply chilled water temperature thermistor probe on a highpressure hermetic centrifugal chiller. Using the illustrated chart, what statement is true if the supply water temperature is verified 45°F with a digital thermometer? Illustration GS-RA-48

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🔍 Key Concepts

• Thermistor temperature vs. resistance/voltage chart – which column gives you voltage and which gives you resistance at 45°F? • Difference between checking a thermistor in-circuit (connected) vs isolated (out of circuit). • Why you need control power ON to measure a voltage drop across a sensor.

💭 Think About

• From the chart, determine the voltage drop and resistance values that correspond to a thermistor temperature of 45°F. Which number matches each unit? • Think about what you can actually measure if the thermistor is isolated from the circuit. With no current flowing, can there be a voltage drop? • Among the choices, which ones correctly pair: power condition, thermistor connection (in or out of circuit), and the expected voltage value from the chart?

✅ Before You Answer

• Verify at 45°F the chart’s voltage drop in volts and resistance in ohms; don’t mix them up. • Check which options incorrectly use the resistance value as if it were a voltage. • Confirm that a voltage drop requires both control power ON and the thermistor connected into the circuit so current can flow.

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Question 1 of 20

When checked with control power on and the thermistor probe isolated, the thermistor probe voltage drop should be 3.805 volts.

When checked with control power on and the thermistor probe connected into the circuit, the thermistor probe voltage drop should be 11.416 volts.

When checked with control power on and the thermistor probe connected into the circuit, the thermistor probe voltage drop should be 3.805 volts.

Question 1 / 2066636eee28f7522a1c51e634

Question 1 of 2066636eee28f7522a1c51e634

Back

Question 1 of 20

66636eee28f7522a1c51e634

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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