You are checking the supply chilled water...

Question 1 / 205eccef9ebacbc34ba4d4618f

Question 1 of 205eccef9ebacbc34ba4d4618f

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

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🔍 Key Concepts

• Using the 45°F row on the thermistor temperature vs resistance/voltage chart • Difference between resistance (ohms) and voltage drop (volts) columns • Proper way to measure a thermistor’s resistance (power off and probe isolated from the circuit)

💭 Think About

• On the 45°F line of the chart, which value is labeled as RESISTANCE (Ohms) and which is labeled as VOLTAGE DROP (V)? • If you try to measure resistance with the thermistor still connected to the control circuit, what other components could affect the reading? • Which answer choice correctly matches: (1) chart resistance value at 45°F and (2) the correct measurement condition for an ohmmeter?

✅ Before You Answer

• Verify that the number used from the chart comes from the RESISTANCE (Ohms) column, not the voltage column. • Confirm that the answer choice you pick says control power off when measuring resistance with an ohmmeter. • Confirm that the answer choice you pick says the thermistor probe is isolated (one lead lifted) so only the thermistor’s resistance is being measured.

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Question 1 of 20

When checked with control power on and the thermistor probe connected into the circuit, the thermistor probe resistance should be 11.416 ohms.

When checked with control power off and the thermistor probe isolated, the thermistor probe resistance should be 3.805 ohms.

When checked with control power off and the thermistor probe connected into the circuit, the thermistor probe resistance should be 11.416 ohms.

Question 1 / 205eccef9ebacbc34ba4d4618f

Question 1 of 205eccef9ebacbc34ba4d4618f

Back

Question 1 of 20

5eccef9ebacbc34ba4d4618f

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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