Operating Instructions

Chapter 5—Troubleshooting
5-8 Siemens Building Technologies, Inc.
6. The box may not have been balanced correctly. Contact your local Siemens Building
Technologies Representative.
7. The air velocity sensor may need calibration. Set CAL AIR (Point 94) to YES to run
the calibration sequence. When CAL AIR returns to NO, indicating that the
sequence is finished, run the checkout procedure again to see whether the problem
has been corrected.
Controller could not reach CLG FLOW MAX or above—CHK STATUS (Point 3) = 16
1. Check for the problems described immediately above for CLG FLOW MIN.
2. The box may be starved for air, either because the central air-handling unit is off or
because of low duct static.
Troubleshooting Procedures
Controller Troubleshooting
The following information describes troubleshooting procedures you should use if you encounter
a problem with the controller. Find the symptom that best describes the problem and perform the
corrective action that follows. For any unresolved problem, contact your local Siemens Building
Technologies representative.
A. BST/FLN LED on controller is OFF.
1. Check the incoming 24 Vac power to controller (19.2–27.6 Vac). See Figure 5-3.
Correct as required.
2. Contact your local Siemens Building Technologies representative.
TEC0467R1
C H E
EARTH GND
24 VAC HOT
COMMON
CONTROLLER POWER WIRING
Figure 5-3. ATEC Power Wiring.