Honeywell EXCEL 5000 User Manual page 181

EXCEL CARE CONTROL ICONS ALPHABETIC REFERENCE
YD3 (OptOff, Excel Web / Excel Web II) is logical 1 during system shutdown.
Otherwise, it is 0.
You can use these outputs in conjunction with an increased room temperature
setpoint during the preheat phase.
EOV Example See the Optimized Start/Stop application in the Examples chapter for a description
of how to use EOV with other icons for a complete optimized system.
Internal Parameters
Heating Case
183 74-5577–33 (US)
EN2B-0184 GE51 R0518 (Europe)