Weathermatic - 2-Zone Expansion Module for SL800/PL800 - SLM2

2-Zone Module for SL800 & PL800. Adds 2 stations to the Weathermatic SL800/PL800 Controller/Timer. The controller will automatically recognize the additional zones as they are installed. No special programming or resetting is required to initialize the modules. You can insert or remove a module without removing power from the controller. To install a module, push the module into the channels until you feel it lock in place. To remove a module, push DOWN on the center release panel on the top of the module and use the top tab to pull it out. Note: Modules must be inserted in the sequence of numbered zones. Do not leave any gaps in module positions.