Refrigerated Seawater SystemsParts 12TON Electric Drive Refrigerated Seawater System The 12 Ton Electric RSW package the smallest of our larger RSW’s using a heavy duty Bitzer Compressor. The unit is prewired and ready to run. It comes complete with remote wheelhouse panel and is run-tested in our shop to ensure product reliability. PartsTEMP CONTROL – 120V Ri SeriesTemp Control – 120V E SERIESPRESSURE CONTROL – 120V Ri SeriesPRESSURE CONTROL – 120V 0-850 E SERIES