Why are the CFM setpoint changing every time we make other configuration changes to the VAV UCM through Tracker?

Issue:

Why are the CFM setpoint changing every time we make other configuration changes to the VAV UCM through Tracker?

Resolution:

Editing any configuration field of a VAV box from the Tracker software will actually drop all of the CFM setpoints by 2 to 3 CFM. This results in a small change each time an edit is made but long term could cause significant system problems.  The current suggested work-around is to have the local operator routinely check and adjust the default setpoints to the original settings.

This issue is limited to changes made in Tracker software. It works correctly with VariTrac or Rover software.

 

Other Question/Problem/Cause Statements:

• Why are the CFM setpoint changing every time we make other configuration changes to the VAV UCM through Tracker?
• Why are the CFM setpoints changing each time I edit the default temperature setpoints?

•  

  Changing configuration of the VAV UCM through Tracker software decreases the configured CFM setpoints

Facts:

• VARITRAC III CENTRAL CONTROL PANEL (CCP)
• Tracker Software
• VariTrac III Central Control Panel (CCP)
• Varitrac Software
• VAV nonLonTalk

Original wave: wave111229