EXCEL CARE CONTROL ICONS ALPHABETIC REFERENCE151 74-5577–33 (US)EN2B-0184 GE51 R0518 (Europe)Optimum Start/Stop / EOHFunction Calculate optimized values for starting and stopping the heating plant and for thesupply water setpoint. The EOH function takes into account the residual heat in abuilding to avoid unnecessary heating operation and, thus, save energy. Requiredroom conditions are met at all times.EOH calculates required flow temperature with an integrated heating curve.Two techniques are available:• optimization without room sensor• optimization with room sensor.Optimization without a room sensor uses outdoor air temperature to determineoptimum start (the preheat point).Optimization with a room sensor uses room control and needs a time constant anddead time to calculate the preheat point. In other words, this type of optimizationrequires a Time Program.Time program setpoint default values:• actual setpoint,• next setpoint• time until the next setpointThe EOH function sets these values during processing via the user address.If optimization in the Time Program is inactive (OPTIM field), the room temperaturesetpoint is valid for the user address and software calculates the heating dischargeair temperature using the heating curve.Adapted Heating Curve The heating curve in EOH is not adapted. If you require an adapted heating curve,use the HCA icon and only run EOH during the optimization of the supplytemperature control. During normal operation, use the HCA icon for the supplytemperature.I/O Dialog Box
