1100 Series - Tork Swimming Pool Time Switches

Automatic ON-OFF control of swimming pool pumping systems with or without water heaters. Two units in one case allow for addition of lighting control, or automatic pool sweep "ON". Models with "FM" suffix contain low voltage secondary circuit to turn OFF water heater thermostat 20-30 minutes before standard voltage main circuit turns OFF pump. This allows for slow cooling of heater coils, preventing sudden steam build-up and knocking, thereby prolonging heater life.