🔍 Key Concepts
• Follow the refrigerant flow path for direct vapor recovery: from the refrigeration system, through the accumulator, into the compressor, and then to the vapor connection on the recovery cylinder.
• Notice which solenoid valves (SV1–SV4) are placed on branches leading to the condenser / liquid path versus the direct discharge-to-cylinder vapor path.
• Think about the function of the accumulator tank and which solenoid(s) must be open so the compressor can actually draw vapor from the system and push it to the cylinder.
💭 Think About
• On the diagram, if the unit is in direct vapor mode, should refrigerant be forced through the condenser and capillary tube, or should it bypass them and go straight to the cylinder vapor port? Which solenoid(s) control that choice?
• Which solenoid valve(s) must be open so the compressor suction can communicate with the accumulator inlet from the system, and which must be closed to prevent flow through the liquid-discharge path?
• Look at SV4’s location: if it is open, where can refrigerant from the accumulator go? In direct vapor recovery, do you want that flow, or do you want to keep the path strictly vapor only?
✅ Before You Answer
• Confirm which line goes to the cylinder vapor connection and which to the cylinder liquid/discharge connection, then match each line to its solenoid valve(s).
• Trace a continuous path from the system inlet to the compressor suction and from the compressor discharge to the cylinder vapor port; the solenoids in that path must be open, and any that would send flow through the condenser/liquid side should be closed.
• Before choosing, make sure your option provides a complete path with no “dead ends” for vapor flow, and that the condenser/capillary/SV1 path is treated appropriately for a vapor-only mode.