The normal operation of a refrigeration...

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Question 1 of 205eccef9dbacbc34ba4d46033

The normal operation of a refrigeration compressor should be to cycle on and off by the action of the primary controller. If the compressor cycles off as a result of system pumpdown, what is true?

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5eccef9dbacbc34ba4d46033

The normal operation of a refrigeration compressor should be to cycle on and off by the action of the primary controller. If the compressor cycles off as a result of system pumpdown, what is true?

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🔍 Key Concepts

• Pumpdown cycle operation in a refrigeration system • The roles of primary controller/thermostat vs. safety cutout switches (high and low pressure) • What condition causes a low-pressure cutout to open during pumpdown

💭 Think About

• When a system is set up for pumpdown, which device actually controls normal on/off cycling of the compressor: the room/box thermostat or the safety cutout switches? • Ask yourself what the high-pressure and low-pressure switches are mainly designed to do: control normal cycling or protect the system from abnormal conditions? • In a pumpdown system, when the solenoid valve closes and suction pressure drops, which pressure control responds, and how does that affect the compressor’s start and stop?

✅ Before You Answer

• Identify which device is the primary controller for normal cycling in a pumpdown system (hint: it usually operates a liquid line solenoid valve). • Confirm that high-pressure cutout is mainly a safety device for discharge pressure, not normal cycling. • Confirm whether the low-pressure cutout acts only as a safety or also as the control that actually starts and stops the compressor during pumpdown.

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Question 1 of 205eccef9dbacbc34ba4d46033

The normal operation of a refrigeration compressor should be to cycle on and off by the action of the primary controller. If the compressor cycles off as a result of system pumpdown, what is true?

Back

Question 1 of 20

5eccef9dbacbc34ba4d46033

The normal operation of a refrigeration compressor should be to cycle on and off by the action of the primary controller. If the compressor cycles off as a result of system pumpdown, what is true?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed