Communications issues with a Niagara R2 UNC-520 and Viconics VT-76xx BACnet thermostats

Issue

Communications issues with a Niagara R2 UNC-520 and Viconics VT-76xx BACnet thermostats

Product Line

TAC I/A Series

Environment

  • Niagara R2 UNC-520
  • Viconics VT-76xx BACnet

Cause

Viconics VT-76xx BACnet thermostats do not support COV.

Resolution

Use the admin tool servlet to set useCOV to false.