It has an internal transformer that reduces supply voltage (120 VAC in US) to 24 VAC. ST8 2.0 The Outdoor Timer can also be wired directly into a power supply by removing the power cord. Outdoor Timer The Outdoor Timer comes with a standard 6 ft power cord so it can be installed indoors, or outdoors if plugged into a weatherproof external outlet. Insert two AAA batteries into the battery slot above the terminal block, as shown below. NOTE: Your programming is stored in NonVolatile memory and will remain in the Timer even if batteries are not installed. Remove the yellow jumper wire from the terminals marked SENS on the terminal block. The Timer can keep the date and time in the event of a power outage if batteries are installed for backup. Install Batteries Rain Sensor Remove the wiring bay cover at the bottom of the unit. Timers support the use of a master valve. Master Valve A pump start relay connects to the Timer in the same way as a Master Valve, but connects differently at the water source. If you are activating a pump from the Timer, you must install a pump start relay. Pumps are used in some places to draw water from a well or other source. Optional Accessories Pump Start Relay Connect an optional Master Valve, Pump Start Relay or Rain Sensor to the Timer. TERMINAL BLOCK Connect a color coded wire from the direct burial cable to either wire on the valve. ST8 2.0 Connect Zone Valves RESET 24VAC SENS C M 1 2 3 4 5 6 7 8 A CCESSORY Valve Connections Use direct burial cable to run wiring from the Timer to valves in the field. NOTE: If installing an outdoor model, route all valve wires through conduit and through the knock-out on bottom of the unit. Wiring Connections Connect the valve wires for each Zone. Valve wire: direct burial, color coded multistrand (not included).
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