The controller board stores the controller's address, applications, and point values. In the
event of a power failure or a reset, these values are retrieved from the controller's permanent
memory and are used by the controller unless overridden by a field panel. If one of the
following conditions occurs, the controller will activate safety features present in its fail-safe
Loss of power. Upon controller power loss, communication with the controller is also
lost. The controller will appear as failed (
To determine if the controller is powered up and working, verify that the Basic Sanity Test
(BST) Light Emitting Diode (LED) is flashing ON/OFF once per second. The controller
contains seven LEDs located on the circuit board. See the Controller LED lndicators section
of Chapter 1, Product Overview for more information about LEDs.
The BACnet VAV Actuator has a built-in checkout procedure that can be manually initiated at
any time after the controller has been installed. The procedure tests all of the necessary I/O
and ensures the controller has the ability to operate within the set airflow range, between
CLG FLOW MIN and CLG FLOW MAX.
To perform the checkout procedure, set CHK OUT to YES. When the procedure is
completed, CHK OUT returns to NO and the results are displayed in CHK STATUS. See
NOTE: Multiple failures are added together and displayed as one value. For example, if the room temperature
sensor failed (1) and the controller could not reach CLG FLOW MAX, CHK STATUS displays 17.
The TX and RX LEDs indicate communication over the FLN.
Table 3. Possible Failure Value and Description.
Checkout procedure has not been run since last controller initialization.
No errors found.
Room temperature sensor failed.
Room setpoint dial failed [If STPT DIAL is set to YES].
Air velocity sensor failed.
Controller could not reach CLG FLOW MIN or below.
Controller could not reach CLG FLOW MAX or above.
) at the field panel.
Siemens Building Technologies, Inc.