UNT-SVX07B-EN 93
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are present, the communicated request has priority over the hardwired input. See Table 22,
Table 23, and Table 24.
Continuous Fan Operation
During occupied and occupied standby modes, the fan normally is on. For multiple speed fan
applications, the fan normally operates at the selected or default speed (off, high, medium, or low).
When fan mode is auto, the fan operates at the default fan speed.
During unoccupied mode, the controller controls the fan off. While unoccupied, the controller heats
and cools to maintain the unoccupied heating and cooling setpoints. In unoccupied mode, the fan
is controlled on high speed only with heating or cooling.
The unit fan is always off during occupied, occupied standby, and unoccupied modes when the unit
is off due to a diagnostic or when the unit is in the off mode due to the local zone sensor module,
a communicated request, or the default fan speed (off).
Table 22. Local fan switch enabled
Communicated Fan Speed Input Fan Switch (Local) Fan Operation
Off Ignored Off
Low Ignored Low
Medium Ignored Medium
High Ignored High
Auto Off
Low
Medium
High
Auto Off
Low
Medium
High
Auto (configured default, determined by heat/cool mode)
Table 23. Fan operation in heating and cooling modes
Fan Mode
Heating Cooling
Occ. Unocc. Occ. Unocc.
Off Off Off Off Off
Low Low Off/high Low Off/high
Medium Med Off/high Med Off/high
High High Off/high High Off/high
Auto Default fan sp. Off/high Default fan sp. Off/high
Table 24. Local fan switch disabled or not present
Communicated Fan Speed Input Fan Operation
Off Off
Low Low
Medium Medium
High High
Auto (or not present) Auto (fan runs at the default speed)
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