Auto-Zone Control Systems Auto-Zone Basic Systems Installation & Operation (Version 02C) - Manual (Page 123)

Auto-Zone Basic Section 4
Start-Up & Troubleshooting 4-21
Zone Damper does not appear to be working correctly
• Is the actuator plugged into the correct jack on the Zone Controller?
• Is the actuator properly mounted? Check for loose shaft, etc.
• Is the damper free to move? Check for binding and/or physical damage. Does the
damper move both directions when the controller is powered up? Set to mid posi-
tion before applying power.
• Is the Zone Controller set for DIRECT/REVERSE action? The zone controller
must be configured for correct operation if REVERSE action of the damper is re-
quired.
Caution: Improper mounting and the associated adjustment of the damper blade
positioning is the number one cause of damper related problems. It can
be difficult to determine the full-open position if the damper shafts are
not marked. It is sometimes helpful to “force” the damper to the full-
open or full-closed position and then check for airflow at the diffusers.
The damper may be forced using the control system or by unplugging
the actuator then depressing the actuator clutch release and manually
positioning the damper.
No zones are communicating
• If used, is the CommLink IV connected and plugged in?
• Is the Zone Manager address set correctly?
Address = 17 if CommLink is used
Address = 0 if no CommLink is used
• Are COMM LOOP voltages correct? See the COMM LOOP troubleshooting
guide.
• Is the COMM LOOP open or shorted?
• Are the Zone Controller address switches set correctly? See the addressing chart.
• Are the Zone Controllers powered? Check 24VAC to the controllers.