Unit protection strategies
CNT-SVX12C-EN 25
Filter-maintenance timer
The filter-maintenance timer tracks the amount of time (in hours) that
the fan is enabled. The Maintenance Required Timer Setpoint (Maint Req
Time Setpoint), configured with the Rover service tool, is used to set the
amount of time until maintenance (typically, a filter change) is needed. If
the setpoint is configured to zero, the filter-maintenance timer is dis-
abled.
The controller compares the fan-run time to Maintenance Required Timer
Setpoint. Once the setpoint is reached, the controller generates a Mainte-
nance Required diagnostic. When the diagnostic is cleared, the controller
resets the filter-maintenance timer to zero, and the timer begins accumu-
lating fan-run time again.
Fan off delay
The fan stays on for an additional 30 seconds (adjustable with the Rover
service tool) to allow the residual cooling or heating energy to be circu-
lated through the system.
Fan status
The controller monitors fan status to protect equipment from overheat-
ing. If fan or airflow is not detected for 30 seconds when needed, the
equipment shuts down.
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