🔍 Key Concepts

• Identify which gauge is low pressure and which is high pressure by looking at their pressure scales on A and B • Trace the internal passages from gauges A and B down to hose connections H, J, and K in the illustration • Understand what happens in a manifold gauge set when the hand valves C and G are open versus closed while you are only monitoring system pressures

💭 Think About

• Which side of a refrigeration system (suction or discharge) should be connected to the lower-pressure gauge, and which to the higher-pressure gauge, to avoid damage and get meaningful readings? • If your purpose is only to read both high- and low-side pressures, do you need refrigerant to flow through the center passage E/J, or just up to each individual gauge? What valve positions (C and G) achieve that? • Look carefully at the arrows and passages around F and D: when C or G are opened, where can refrigerant flow, and could that unintentionally connect the high and low sides or the center hose?

✅ Before You Answer

• Confirm which bottom hose connection (H or K) is directly under the low-pressure gauge A and which is under the high-pressure gauge B • Verify what the illustration shows about the flow path when valves C and G are turned: do they open a route to the center passage E/J, or do they isolate it? • Before choosing, ask: for monitoring only, should the manifold allow flow between the high side and low side/center hose, or should each side be isolated while still letting pressure reach its own gauge?