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If you received a Honeywell 7248U with your Biasi boiler, you will need to make the changes
shown above, and described below to the wiring diagrams.
1. Run wire 1 to the L1 terminal on the 7248U instead of running wire 1 to the 4006A.
2. Run wire 2 to the L2 terminal on the 7248U instead of connecting to wire 4.
3. Run wire 4 to the B2 terminal on the 7248U instead of connecting to wire 2.
4. Run wire 5 to the B1 terminal on the 7248U instead of connecting to the isolated end
switch.
5. Lastly, run low voltage wiring from the TT terminals on the 7248U to the isolated end
switch.
7248U WIRING PROCEDURE
4006A
WIRING
7248U
WIRING
11. Wiring