Which of the listed valves should be closed...

🔍 Key Concepts

• Flow path of refrigerant during normal operation (from receiver through king valve, through system, and back to compressor) • Purpose and typical location of suction service and discharge service valves on a compressor • Safety considerations when introducing (charging) refrigerant into a system – especially avoiding liquid slugging of the compressor

💭 Think About

• When you charge refrigerant into the system, do you want it to enter on the low‑pressure side or the high‑pressure side of the compressor? Which valves control those sides? • If you leave certain compressor service valves open while charging, what risk does that create for the compressor cylinders? • Think about which valve is normally used to isolate the receiver from the rest of the system when adding or removing refrigerant.

✅ Before You Answer

• Identify which valve is directly on the liquid line from the receiver (king valve) and what position it is usually in when charging • Confirm which valve(s) connect directly to the compressor suction and discharge ports • Verify which line (suction or discharge) is safest for introducing liquid refrigerant without risking liquid carryover into the operating compressor

Which of the listed valves should be closed when charging ammonia into a refrigeration system?

Master valve

Suction service

Discharge service

King valve

🔍 Key Concepts

💭 Think About

✅ Before You Answer