Xenta 121-HP Flow Feedback Error

Issue

Operation of Xenta 121-HP Flow Feedback Error as sensed via hardwired flow input or nviSourceFlow network input.

Product Line

TAC Vista

Environment

  • Xenta 121-HP
  • ZBuilder

Cause

For a heat pump, nvoSystemStatus bit 12 is set if an expected flow is missing. For example, when the isolation valve is open there should be a flow feedback, but when it is closed or opening, no signal is expected.

Resolution

Flow feedback error will disable cooling and heating outputs. There is no need to define an exception mode in ZBuilder in order to enable this safety override.