The EcoNet Zoning Panel, part number: REPNL700ZON, is the main control that communicates between the dampers, thermostats and the HVAC system. When there is a call for heating or cooling the Zone Panel receives a signal from the EcoNet Smart Thermostat and modulates the dampers accordingly. Each zone panel will accommodate up to three (3) zones, or up to six (6) zones when two control panels are connected together. A dip switch located on the zone panel will identify it as zones 1-3 or 4-6.