Trane PRGD series Installation, Operation And Maintenance Manual page 10

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Figure 3. Components of a Trane EarthWise purge system (back view)
1. Regeneration solenoid valve
2. Pressure-relief valve
3. Exhaust solenoid valve
4. Pump-out compressor
5. Carbon tank heater
6. Automatic expansion valve
7. Pump-out solenoid valve
8. Pressure-relief device (fusible plug)
9. Carbon tank
10. Purge tank
11. Condensing unit
12. Chiller refrigerant supply line
10 PRGD-SVX01F-EN