Optimum Start/Stop / Eoh - Honeywell EXCEL 5000 User Manual

EXCEL CARE CONTROL ICONS ALPHABETIC REFERENCE

Optimum Start/Stop / EOH

Function Calculate optimized values for starting and stopping the heating plant and for the
supply water setpoint. The EOH function takes into account the residual heat in a
building to avoid unnecessary heating operation and, thus, save energy. Required
room 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 determine
optimum start (the preheat point).
Optimization with a room sensor uses room control and needs a time constant and
dead time to calculate the preheat point. In other words, this type of optimization
requires a Time Program.
Time program setpoint default values:
• actual setpoint,
• next setpoint
• time until the next setpoint
The EOH function sets these values during processing via the user address.
If optimization in the Time Program is inactive (OPTIM field), the room temperature
setpoint is valid for the user address and software calculates the heating discharge
air 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 supply
temperature control. During normal operation, use the HCA icon for the supply
temperature.
I/O Dialog Box
151 74-5577–33 (US)
EN2B-0184 GE51 R0518 (Europe)