Operating Instructions

Chapter 3—Applications for ATEC—VAV with Reheat
3-34 Siemens Building Technologies, Inc.
Automated Checkout
The ATEC 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
(Point 31) and CLG FLOW MAX (Point 32).
To perform the checkout procedure, set CHK OUT (Point 10) to YES. When the procedure is
completed, CHK OUT returns to NO and the results are displayed in CHK STATUS (Point 3).
See Table 3-5.
Table 3-5. Possible Failure Value and Description.
CHK STATUS
Values (Point 3)
Description
-1 Checkout procedure has not been run since last controller initialization.
0 No errors found.
1 Room temperature sensor failed.
2 Room setpoint dial failed [If STPT DIAL (Point 14) is set to YES].
4 Air velocity sensor failed.
8 Controller could not reach CLG FLOW MIN or below.
16 Controller could not reach CLG FLOW MAX or above.
NOTE: Multiple failures are added together and displayed as one value. For example, if
the room temperature sensor failed (1) and the controller cannot reach CLG
FLOW MAX (16), CHK STATUS displays 17.
Application Notes
1. If temperature swings in the room are excessive or there is trouble maintaining the
setpoint, the cooling loop, the heating loop, or both need to be tuned. If FLOW (Point 75)
is oscillating while FLOW STPT (Point 93) is constant, the flow loop requires tuning.
Contact your local Siemens Building Technologies representative for more information.
2. The ATEC, as shipped from the factory, keeps all associated equipment off. The
controller and its equipment are released to application control during start-up.