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Did this come with a manual or not? What was the make and model of the water heater you took out?
I would look on the data tag on the outside front and be sure that this isn't an Atwood model. A Suburban SW6DE has no orage wire, but an Atwood does. Let me know if that might be the case here.
I have no information about a SW6DE with that wiring. Can you attach a photo of this to your post? Use the paperclip icon.