That is one advantage of the wet/dry conductor method. If the main is frozen and the sap starts to flow, it uses the dry line. The sap will not over power the dry line if the wet/dry are sized properly and the short time the sap uses the dry line will be rather short. You should not need to make any changes. You may however want to revisit Steve Childs' Cornell Maple Tubing Notebook to be sure you have designed the system properly.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.