If a refrigeration unit is fitted with...

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Question 1 of 205eccef9dbacbc34ba4d46086

If a refrigeration unit is fitted with suction and discharge services valves constructed similarly to the valve labeled "D" in the illustration, what statement is true concerning the valve status when servicing is complete and the gauge manifold set is removed, with the unit in normal operation, assuming that no permanently installed gauges or pressure switches are connected to the service port "1". See illustration GS-RA-08.

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🔍 Key Concepts

• Back seated vs front seated position on a refrigeration service valve and which position completely opens flow through the main line. • How the service port (1) is connected or isolated in each valve position shown in views A, B, and C of the illustration. • Why you might crack a valve off its back-seat during operation only when a permanent gauge or pressure control is installed on the service port.

💭 Think About

• Look at view D and trace the refrigerant path in each stem position: which position gives full flow between inlet and outlet while isolating the service port? • In normal operation with no gauge or switch on port 1, do you want port 1 to be exposed to system pressure, or completely sealed off to prevent leakage? • Which of the answer choices describes both: (1) full normal flow through the valve, and (2) the safest condition for an unused service port after removing the manifold set?

✅ Before You Answer

• Verify which stem position in the illustration corresponds to full open main passage and service port shut. • Confirm that cracked off back-seat is normally used only when you need a live pressure signal at port 1. • Make sure the choice you select includes both proper stem position and the protective actions: packing tightened and seal cap installed.

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