TM 9-2320-289-3410-21. AIR CONDITIONING SYSTEM SERVICING (M1010) (Con’t).3 .When low side gage (2) needle stabilizes at 29 in. Hg, operate vacuum pump (11) for anadditional 30 minutes. Completely close low side valve (1) and high side valve (4) on manifoldgage set. Close discharge valve on vacuum pump, Wait 5 minutes, and check to see if lowside gage needle moves. If low side gage needle moves, there is a leak in air conditioningsystem. Locate leak, if present, using refrigerant gas leak detector. Repair leak in system ifpresent, and repeat this step before performing step 4.4 .If low side gage (2) needle position remains constant, disconnect center hose (6).c. CHARGING SYSTEM WARNINGl Never Open high side valve (4) on air conditioner manifold gage setwhile air conditioning system is operating. Refrigerant may be pumpedback into refrigerant container (12) and cause refrigerant container toexplode, resulting in serious Injury or death to Personnel.l Never attempt to charge system on the high side while air conditioningsystem is running. Failure to follow this warning may result in injury topersonnel.TA5044910-82
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