I just purchased an intermatic T104P201 with fireman switch so I could cut down on running my equipement. I have a 240V setup for the pump and heater. The fireman swith has one pair of black leads, so it can only interupt 1 of the two lines of power to the heater. Is this how it is supost to work? It seems you would want to interupt both lines like the timer does for the pump. My wiring is currently set up so that a 240 switch cuts power to both lines of the heater and pump when it is turned off.