Monitoring and Operating the Controller
208 UDC3500 Universal Digital Controller Product Manual 3/07
4.10.2 Tune for Duplex (Heat/Cool)
Accutune for applications using Duplex (Heat/Cool) control.
The controller must be configured to have two local setpoints unless Blended Tuning is
desired (see below). See Subsection 3.20- Control Set Up Group for details on
configuring two local setpoints. During tuning, the Accutune III process assum
es that
Local Setpoint 1 will cause a Heating demand (output above 50%), and the tuning
parameters calculated for that setpoint are automatically entered as PID SET 1. Likewise,
Accutune III assumes that Local Setpoint 2 will cause a Cooling demand (output less
than 50%), and the tuning parameters calculated for that setpoint are automatically
entered as PID SET 2.
Configuration Check for Duplex
See Subsection 3.10 – Accutune Set Up Group f
or details.
Make sure:
• TUNE has been enabled
• DUPLEX has been configured to Manual, Automatic or Disabled
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