I'm installing a Aquarite chlorinator, and something went terribly wrong!
As instructed by the manual for 110V installations, I removed the jumpers from terminals 2/3 and moved them to terminals 1/2 and 3/4. This is connected to the Load side of my 110V timer. The load side is also connected to the pool pump. I also ensured that the bonding wire on the bottom of the cabinet was connected to the bonding terminal on the back of the pump.
But when I flipper the timer manual switch to ON, I immediately got a loud BANG from the Aquarite cabinet, and it flipped the 60A breaker dedicated to the pump/timer/chlorinator as well as the 60A breaker behind it in the main panel.
The timer and pump appear unscathed by the ordeal, but the main circuit board of the Aquarite shows significant damage to at least the two red MOVs on either side of the terminal block (you can see the pieces and smoke in the photo below).
So, what did I do wrong? As far as I know, the circuit is 110V, not 220, and the instructions explicitly told me to connect the controller to the load side of the timer so it would not be running while the pump is off.
In the photo below, I wired red to hot (timer load), and black to neutral (unswitched). The corresponding wires in the breaker box are black and white, respectively.
UPDATE: Idiot electrician did not label the breaker as 220V. Idiot me assumed it was 110V. So that was the problem. Just confirmed with voltmeter.