13. The color code for recovery cylinders is _____. A. gray B. gray bottom, yellow top C. yellow bottom, gray top D. none of the above 14. True or false? Recovery cylinders are considered full at 80% of total cylinder capacity. 15. The expanding liquid inside a cylinder creates _____ pressure. A. negative B. positive C. hydrostatic D. all of the above 16. Recovery cylinders have (one, two) valves. 17. Passive recovery can be used only when the system has a running _____. A. evaporator fan B. compressor C. condenser fan D. metering device 18. When recycling refrigerant, how long must the refrigerant normally recirculate through a filter-drier? A. 30 minutes. B. 4 to 6 hours. C. All day. D. Not required. 19. R&R equipment refers to _____. A. recycle and reclaim B. recover and recycle C. reclaim and dispose D. all of the above 20. To perform a pumpdown means to capture refrigerant in the _____. A. liquid receiver B. evaporator C. compressor D. suction line 280 Heating and Cooling Essentials Copyright Goodheart-Willcox Co., Inc.