hunter pcm-900 module for pro-c controllers hunter hunter pro c 9 station expansion module station expansion: 9 expansion module only controller compatibility: pro c controllerfeatures & benefitsthis is a module only - use as an add-on to your existing irrigation controller - adds 9 stations to your existing irrigation controllerimportant: the pcm-900 will not work in the pro-c series without an additional pcm-300 module. the pro-c irrigation controller is equipped with a 3 station expansion module; however, an additional 3 station module is required to activate the pcm-900. the pcm-1600 station module is not compatible with the similar hydrawise modelthe pro-c controller is supplied with a base 4-station module. additional modules may be added separately in increments of 3 stations (pcm-300), 9 stations (pcm-900), or 16 stations (pcm-1600). in total, the system may be expanded up to 23 stations. additional modules are sold separately.the pro-c utilizes automatic module recognition firmware to identify when pcm modules are installed or removed from the controller. this feature will recognize the correct number of stations without having to reset or cycle power to the controller.the pro-c controller is designed with a simple to use power lock feature that assures that the modules are energized and firmly secured into the controller. the power lock can unlock or lock all modules at one time by simply pushing the slide bar.product detailsinstalling pcm modules lide the power lock into the power off (unlocked) position. insert any additional station modules into the appropriate output slots. once all modules are in place, slide the power lock into the power on (locked) position to energize and secure the modules into the controller. the pro-c will automatically recognize the correct number of stations. in some cases, it may be necessary to press the reset button on the back of the facepack or cycle power to the controller. note: the pcm-900 module is used to expand your controller to 16 stations that requires one pcm-30