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BRAZING - TM-5-4120-375-14_180
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Leak  Checking - TM-5-4120-375-14_182
5-13 TM5-4120-375-14 5-16.  Leak  Checking. a.   Connect   a   pressure   gauge   to   the   suction   service   valve   and   a cylinder   of   refrigerant   (item   21,table   D-1)   to   the   discharge service   valve.   Open   both   service   valves   and   the   cylinder   shutoff valve.   Let   refrigerant   flow   into   the   system   until   the   pressure gauge   indicate   50   psig   (3.5   kg/cm   2).   Close   cylinder   shutoff valve   and   discharge   service   valve   and   disconnect   the   refrigerant cylinder. b. Connect   a   cylinder   of   dry   nitrogen   (item   8,table   D-1)   to   the   dis- charge   service   valve. Open   the   cylinder   shutoff   valve   and   the discharge   service   valve   and   pressurize   the   system   to   350   psig (22   kg/cm   2). Close   all   three   valves   and   test   for   leaks,   using   an electronic   leak   detector   or   the   soap   bubble   method   as   described below: NOTE The   electronic   leak   detector   is   sensitive   to   the   presence   of refrigerant   gas   (Table   D-1,   Item   1)   in   the   atmosphere.   When   refrigerant gas   is   present   in   the   atmosphere   of   the   work   area,   false   indications can   result.   Use   in   a   well   ventilated   but   draft-free   area.

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