I have tried to explain this several times on here and it seems that most usally do the double thermostats but here we go again. You will need 1 Argo relay, 1 Honeywell strap on aquastat. Take the existing TT wires to the TT terminals on the Argo relay and then continue them down to the TT terminals on the burner itself, that is your low voltage side done. Now bring 110 to the power in terminals on the Argo relay, then come off the normally open terminal on the Argo relay with a power(110) wire to the low, medium, or high speed wire on the blower motor itself, your choice which one, cut that wire and attatch the three together, this simply adds another power source to your blower motor. Now for the part most folks don't understand, strap the Honeywell aquastat to the incoming wood boiler line on copper or black iron, (not pex as it will not register the heat as well ) run two wires from the R+B terminals on the aquastat down to the power wire on the burner itself (AKA B-1), cut that wire and attatch the ends to the two wires you brought over from the aquastat, set the aquastat at about 160 degrees, you have just interupted the burner circuit and it cannot fire above the aquastat setpoint, when the aquastat registers below setpoint the burner returns to normal. above the setpoint power is diverted through the Argo relay and powers up the blower only.