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EVACUATING   THE   SYSTEM
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TM-5-4120-375-14 Air Conditioner Horizontal Compact 18 000 BTU 208 Volt 3 Phase 50/60 Hertz NSN
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CHARGING THE SYSTEM - TM-5-4120-375-14_185
TM5-4120-375-14 5-17. EVACUATING THE SYSTEM (cont.). (1). (2). (3). (4). (5). Presence of water vapor in the system. Continued  pumping will correct this condition. Leaks in the refrigeration system. Break the vacuum with dry nitrogen (item 8,table D-1) and retest for leaks in accord- ance with paragraph 5-16. Internal leakage of vacuum pump. Test the pump by connecting a vacuum gauge direct to the vacuum pump intake and continue to pump. If pump still fails to reach 500-microns, the pump is faulty. With the suction line service valve closed, disconnect the vacuum pump and attach a cylinder of dry nitrogen (item 8,table D-l). Leave the connection to the suction service valve somewhat loose and open the nitrogen cylinder shutoff valve slightly for a few seconds to purge the line of air. Tighten the connection and crack the suction service valve open slightly to break the vacuum. Leave in this configuration  until  the  system  reaches  atmospheric  pressure (760mm) then close the suction service valve and the cylinder shut-   off valve and disconnect the nitrogen cylinder. Reconnect the vacuum pump to the suction service valve gauge port and start the pump.    Open the suction service valve and again pump until a 500-micron vacuum is achieved. This double evacuation will remove all traces of water vapor and non-condensable gas from the system. Close the suction service valve and disconnect the vacuum pump. Close the discharge service valve and remove the vacuum gauge. Charge system in accordance with paragraph 5-18. 5-16

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