I will read that tonight. So far, I hooked L1 and L2 to a 120V plug, B1 and B2 to the stoker motor, the pump to C1 and C2. When I first plugged it in, BANG!. There was a short from hot to ground on my plug. I fixed that and started taking a good look at the wiring with my meter. Now when I plug it in, the stoker motor runs, I think this is correct beacuse the aquastat is below 160 degrees. I would think that when I short the thermostat terminals the cir pump should come on? It doesn't, the relay clicks, the only voltage that changes is one of the Z terminals. Is this correct? If so, where should I hook the circ pump?