In a refrigeration system featuring low-side...

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Question 1 of 2066636eee28f7522a1c51f191

In a refrigeration system featuring low-side pumpdown prior to the automatic shutdown of the compressor, the temperature of the refrigerated space is controlled by the action of a thermostat wired to what device?

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🔍 Key Concepts

• Low-side pumpdown operation in a refrigeration system and what happens just before the compressor stops • How a space thermostat usually controls temperature when a pumpdown cycle is used (directly on the compressor vs. on a valve/solenoid) • The roles of a solenoid valve, a low-pressure cut-out switch, and a thermostatic expansion valve in system control

💭 Think About

• When the space reaches the set temperature, what is the first control action that starts the pumpdown sequence? Does the thermostat stop the compressor directly, or cause something else to happen? • Which device in the list actually starts and stops the flow of refrigerant into the evaporator when using a pumpdown control strategy? • During pumpdown, what device finally shuts the compressor off: is that the same device the thermostat is wired to, or a separate safety/control switch?

✅ Before You Answer

• Identify which component is responsible for cutting off refrigerant to the evaporator in a low-side pumpdown system • Distinguish between the device that the thermostat controls directly and the device that reacts to pressure to stop the compressor • Verify that the chosen device is one that a thermostat would reasonably be wired to electrically, not one that is purely mechanical in operation (like a typical thermostatic expansion valve)

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