The high pressure cut-out switch used on...

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Question 1 of 205eccef9dbacbc34ba4d46029

The high pressure cut-out switch used on centrifugal low pressure refrigeration units using R-123 would be set to shut off the compressor at approximately what pressure?

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5eccef9dbacbc34ba4d46029

The high pressure cut-out switch used on centrifugal low pressure refrigeration units using R-123 would be set to shut off the compressor at approximately what pressure?

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🔍 Key Concepts

• R-123 refrigerant characteristics such as normal operating evaporator and condenser pressures • Typical condensing pressure range for low pressure centrifugal chillers using R-123 • Purpose of a high pressure cut-out switch and why it must protect equipment but not trip during normal operation

💭 Think About

• Think about what an approximate normal operating condensing pressure would be for R-123 at typical chiller condensing temperatures (around cooling water temperature plus approach). Would the cut-out be just above this value or far above it? • Compare each answer choice to what you’d expect for a low-pressure refrigerant. Which pressures look more like high-side pressures for a medium/high-pressure refrigerant, and which look more realistic for R‑123? • Ask yourself: if the unit normally runs below atmospheric pressure on the low side, what order of magnitude makes sense for a high-side safety cut-out on the compressor discharge?

✅ Before You Answer

• Verify the saturation pressure of R‑123 at common condensing temperatures (e.g., 85–100 °F) and note the approximate pressure range in psig. • Check that the selected value is high enough that normal condenser pressure fluctuations won’t cause nuisance trips, but low enough to protect the system from overpressure. • Confirm that your choice matches the behavior of a low pressure centrifugal chiller, not a system using higher pressure refrigerants like R‑22 or R‑134a.

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Question 1 of 205eccef9dbacbc34ba4d46029

The high pressure cut-out switch used on centrifugal low pressure refrigeration units using R-123 would be set to shut off the compressor at approximately what pressure?

Back

Question 1 of 20

5eccef9dbacbc34ba4d46029

The high pressure cut-out switch used on centrifugal low pressure refrigeration units using R-123 would be set to shut off the compressor at approximately what pressure?

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