Installation, continued15Replacing the BatteryThe MDC2 Controller has a built-in lithium batteryto backup and store the program memory. Duringnormal use, the battery should last for 10 years.Replace the battery when the MDC2 Controller nolonger holds the programmed information.Warning! The components inside the MDC2Controller are sensitive to electrostaticdischarge By using a grounding strap, you canhelp avoid electrostatic discharge, which candamage the unitsTo replace the battery,1. Remove the controller cabinet door from itshinges by opening the door, then pushing themetal pin up and out of the hinge. Set the doorand pin aside.2. Unscrew and remove the faceplate. Set thefaceplate aside. Set the faceplate aside.To prevent electrical shock, turn off thecontroller and shut OFF all supplypower to the unit at the Main powerbefore proceeding. Electrical shock cancause severe injury or death.3. Using a Phillips head screwdriver, removethe five screws, lock washers and metal clip.Carefully lift the display and control module asfar as the connecting wires allow.4. Disconnect the two-wire harness from theboard by grasping the connector and pullingstraight up.MDC
