A transformer in the controller reduces the 120 volts to approximately 24 volts. What voltage is used to turn the valve on and off?

A transformer in the controller reduces the 120 volts to approximately 24 volts. What voltage is used to turn the valve on and off?

• A. 120 Volts
• B. 60 Volts
• C. 24 Volts
• D. 240 Volts

Answer: (C)

The controller uses a transformer to drop the mains voltage down to a safe, low level for the valve. The valve coil is designed to be energized by about 24 volts AC, so that is the voltage used to turn it on and off. Using 24 volts keeps the wiring and components safe and cost-effective, and it matches the common ratings for irrigation solenoids. Higher voltages like 120 or 240 volts would require different hardware and wiring, and 60 volts isn’t the standard coil rating for these valves.

The controller uses a transformer to drop the mains voltage down to a safe, low level for the valve. The valve coil is designed to be energized by about 24 volts AC, so that is the voltage used to turn it on and off. Using 24 volts keeps the wiring and components safe and cost-effective, and it matches the common ratings for irrigation solenoids. Higher voltages like 120 or 240 volts would require different hardware and wiring, and 60 volts isn’t the standard coil rating for these valves.