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Features 3 Zones expandable to 5 or 7 zones with the addition of 1 or 2 Model XM-2 expansion modules. Gas/Electric/Hydro Up to 2 Stages Heating and 2 Stages Cooling. Heat Pump Conventional or Dual Fuel Up to 3 Stages Heating and 2 Stages Cooling. Any single stage Heat/Cool Thermostat or 2 Stage Heat 1 Stage cool Heat Pump Thermostat. EWC Models URD ND RSD and SID. Any 24vac 3 Wire or 2 Wire damper. EWC Models URD ND RSD and SID. Any 24vac 3 Wire or 2 Wire damper. ADDITIONAL FEATURES Staging via Adjustable On-board Timer or OAS. 7 to 42 Minutes or 7 to 42F 50% Rule to limit staging if less than half the total zones are demanding Heating or Cooling. Supply Air Temperature Monitoring to help protect HVAC equipment. 100% Dual Fuel Compatible. On Board LE Ds indicate system operation.