Mike, I'am doing this memory however I believe the "On" or up position of the switch is for 50 amp shore power, or when the gen is running. The "Off" or "Down" position is 30 amp shore power.
I wouldn't try running the basement system (A/C or Heat pump) on 110V household power.
Good luck.
fred
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Fred and Bonnie
2005 Dolphin LX 6375
Abby, Ruffles & Scarlett, "The Cats"
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