Sharp AF-S100RX, Service Manual, Page: 37 / 62

Section 5 Sealed System
5 -11
Refrigerant Recovery Systems
Efficient recovery of refrigerant from equipment or containers requires evacuation at the end of the recovery cycle.
Suction lines to a recovery compressor should be periodically checked for leaks to prevent compressing air into the
recovery refrigerant tank during evacuation. In addition, the recovery refrigerant tank pressure should be monitored,
and evacuation stopped in the event of a rapid pressure rise indicating the presence of noncondensable air. The
recovery refrigerant tank contents should then be analyzed for NAG, and the recovery system leak checked if air is
present. DO NOT continue to evacuate a refrigeration system that has a major leak.
Recovery Methods
Even though refrigerant properties are different, the basic recovery process is the same for R-410A and R-22.
R-410A is much more dense than R-22 and has a higher vapor pressure making it more dif cult to recover. The
hook-up and recovery instructions will vary from manufacturer to manufacturer so be sure to read and understand all
of the operation instructions for the refrigerant recovery unit being used.
Push-Pull Recovery
Quickly removes the liquid refrigerant, but you must change the hose connections to recover vapor refrigerant after all
of the liquid is removed. This method is not recommended unless trying to recover more than 10 pounds of refrigerant.
Liquid Recovery
Not all recovery equipment is capable of handling direct liquid recovery. Check with the manufacturer of the recovery
equipment used to nd out if the unit is capable and if there are any special instructions for direct liquid recovery.
Vapor Recovery
This method is slower than liquid recovery, yet is the most common method used to recover refrigerant.
λ½±ª»®§
˲·¬
Ô¾-ò
Ô·¯«·¼ ᮬ Ê¿°±® ᮬ
Ñ°»² Ý´±-»¼
ÜòÑòÌ
λ½±ª»®§
Ì¿²µ
ݱ²¼»²-»¼ Ô·¯«·¼
Ú·´¬»® Ü®·»®
λº®·¹»®¿²¬ λ½±ª»®»¼
Ú®±³ ̸» Ø·¹¸ ß²¼ Ô±© Í·¼»
ß·® ݱ²¼·¬·±²»®
Ñ°¬·±²¿´ èðû
Ì¿²µ ͸«¬±ºº ݱ®¼
ͽ¿´»
Vapor Recovery Method
Figure 5 -4.