I sent an email to the factory trying to determine the same thing. The intelligent answer I received was that it did not matter, if cold turn them all on. The curious part is I have 3 unlabeled switches and 4 tanks... is one unheated or does one switch control 2 tanks?
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Butch and Kathy
2016 3160RL Legacy, Sailun S637, Centramatic Balancers, 2-T105s, Amish Refrigeration, ARPrv, SoftStartRV, FlexArmor roof
2016 F350 6.7L SRW
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