Diagnostic: Local Space Setpoint Failure

Issue:

Diagnostic: Local Space Setpoint Failure

Resolution:

 

 

This diagnostic refers to the hardwired input for space temperature setpoint at the controller. 

At power up the controller scans each of the input circuits for a signal.  If a signal is detected, the sensor designated for that input is deemed to be present.  Subsequently if the input signal is outside the normal range, the input is marked as failed.  So, if a sensor is present and then removed, that input will continue to be reported as failed by the controller, even when the sensor is no longer present.  Also, the signal required to mark the input as present does not need to be in the normal range for that input.  Sometimes a controller will detect a very small signal on an input circuit when no sensor is actually wired to the input.  In this case the controller may report a failed input even though there has never been a sensor actually wired to the input. 

If an input is removed, cycle power on the controller.  This will cause the controller to re-scan for input signals.  The controller will mark the input as not present and the input will no longer be reported failed. 

 

 

Notes:

 

Changes:

 

Other Question/Problem/Cause Statements:

• He has a new Tracker 12 with ZN517s. If he takes off the thumbwheel input will he always have a diagnostic on the 517.  Does the 517 require a thumbwheel input? 
• Does ZN517 require a local hardwired setpoint
• Do unit controllers need a local hardwired setpoint
• Does ZN517, ZN520, Zn510, ZN524, VV550 require local hardwired setpoint
• Diagnostic:  Local Space Setpoint Failure

Facts:

• TRACKER BMTK
• Tracer ZN517
• Tracker BMTK

Original wave: wave1921