As shown the illustrated water-cooled rotary...

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Question 1 of 205eccef9dbacbc34ba4d4607e

As shown the illustrated water-cooled rotary chiller refrigerant flow and lubricating oil circuits, which of the listed thermistors is used as a sensor for the electronic control circuit for the electronic expansion valve? See illustration GS-RA-29.

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🔍 Key Concepts

• Electronic expansion valve (EXV) purpose and what variable it must sense to match refrigerant flow to cooling load • How thermistors are shown and labeled in illustration GS-RA-29 legend (symbols and numbers) • Relationship between chilled water temperature and evaporator load versus suction/discharge gas conditions

💭 Think About

• From the diagram legend, which thermistor symbol is actually connected, by the control wiring/device symbol, to the EXV rather than to safety or indication circuits? • For controlling refrigerant flow to maintain correct evaporator operation, is it more important to sense a WATER temperature or a REFRIGERANT gas temperature in this type of chiller? Why? • Which temperature best represents the load on the chiller from the ship’s air‑conditioning system: suction gas, discharge gas, chilled water entering, or chilled water leaving the evaporator?

✅ Before You Answer

• Verify in the legend which numbered item is the electronic expansion valve (EXV) and then trace any associated thermistor numbers from the evaporator section. • Confirm which thermistors are located on the water side of the evaporator versus on the refrigerant gas side; only some of these can directly indicate chilled water load. • Make sure you distinguish between sensors used for capacity/safety protection (like high discharge temperature) and the one used specifically for EXV control.

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