Refrigerant charging onboard ship

  • Normally refrigerant in the liquid state is changed at the high-pressure side.
  • Weigh the bottle with a spring scale.
  • Connect the charging pipe between liquid valve of bottle and charging valve (ensure air is purged out the collecting cylinder).
  • Fully open bottle liquid valve, charging valve is still closed.
  • Close main liquid stop valve is outlet from condenser (or receiver) & run the compressor, so that system (compressor stop on  lp cut out) is starved of refrigerant - carry out short cycling.
  • Slowly open charging valve (avoid frosting on suction pipe). changing to be done in stages. After filling compressor is shut down & cooling water kept for some hour. (3/4 of sight glass).
  • Then air can be purged out from air vent valve of condensor.

Charging connection:
Liquid (blue) - between the receiver and Silva gel filter or through filter gas(red) - before the suction valve.

  • Silica gel filter has been replaced by the desiccant, which is a filter and depends on the type of refrigerant used
  • To purge charging line after charging refrigerant, valve 1&3 to be in close position and valve 2 to be open & run compressor.
  • We can also use a vacuum pump instead of an empty bottle to purge the charging line.
  • HP charging connection is provided between receiver and dryer (filter) or through a filter. LP charging connection is provided at the suction of compression. (generally avoided).


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