I've tried Googling on various search terms and haven't managed to find anything, so here goes:
Does anyone know if there is available on the market a controller for hot water tanks, whereby a float switch in a drain pan can shut off a solenoid-operated valve on the cold water inlet and the 230v supply to the heater elements? Or do the same in the event of a power failure? Here's a bad ASCII art attempt at a schematic of what I have in mind:
115 Vac L1 N | | ) [bkr in svc pl] | | | | N/C FLOAT SW RESET (N/O PB) | | __|__ | `-----o--.-o--------+---o o---+----------+---(M)---+----------' | | M | | | ^ `----| |----' `---(S)---' : SOLENOID FOR N/C VALVE 230 Vac 2 ph : L1 L2 : N | | : | )--- ) [2-ph bkr in : | | | in svc pl] M .------. | | `-------------------| |-----------| HTR | | | M | TERM |-----------------' `------------------------| |-----------| BOX | `------'The idea is that if the power goes off or the float switch opens, the M coil d-energizes and the M contacts open. Because there's a sealing circuit in the 120 supply to the coil, the system won't re-energize until someone comes and pushes the reset button, thus keeping the system safe if it should trip while I was away on holidays or what-have-you. Alternatively, the float switch could be a flow switch in the drain line from the drain pan.
So, anyone know if a ready-made controller like this is available on the market?
Yours aye, W. Underhill