Application

Sequence of Operation
Application Notes
11
Siemens Industry, Inc. Application Note, App 2520 140-1217
2015-05-06
2. The damper shaft may not be secured correctly to the actuator so that when the
actuator is fully closed, the damper does not completely shut off airflow.
3. Airflow calibration (at zero) may need to be performed ensuring the damper is fully
closed and/or the air handling unit is off.
Application Notes
 If temperature swings in the room are excessive or there is trouble maintaining the
setpoint, the cooling loop must be tuned. If FLOW is oscillating while FLOW STPT
is constant, the flow loop requires tuning.
 The controller, as shipped from the factory, keeps all associated equipment OFF.
For more information, contact your local Siemens Industry representative.
Wiring Diagram
Application 2520 and 2521 Cooling Only Wiring Diagram.
NOTE:
There are no external I/Os for the Cooling Only Applications 2520 and 2521.