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The problem with using the R7284 as a replacement for the R8184 is that the new control requires an additional hot feed. It requires constant voltage to L1 your old hot from the furnace/boiler goes to the LIMIT terminal.
You really only need 1 common/neutral but you can use any of the L2 terminals for an additional common. All you really need to do is run a single hot lead to L1
You need a common/neutral so you should have a common on L2 and it should be a constant so if you have an aquastat relay for a limit control the B2 lead may not be a constant. I'd suggest you run a common from your line in for the heating unit. If you already have all your whites tied together you can try a lead from them to L2
Yes, the wiring diagram shows the common from the unit's line in not B2 which may be what's feeding your bundled commons now