The Pro-C is compatible with the Hunter Solar Sync. Solar Sync is a sensor system that will automatically adjust the Pro-C controller’s watering run times (based on changes in local climate condition) by using the Seasonal Adjust function. The Solar Sync uses a solar and temperature sensor to determine evapotranspiration (ET), or the rate at which plants and turf use water, and also includes Hunter Rain Clik and Freeze Clik technology that will shut down irrigation when it rains and/or during freezing conditions.
The Pro-C / PCC (blue panel and blue buttons) with the SOLAR SYNC dial position is programmed with the Solar Sync technology and, therefore, does not require the use the Solar Sync module.
The older style Pro-C controllers (green buttons) require the installation of the Solar Sync module as well as the Sensor.