Trane UniTrane Installation Operation & Maintenance page 67

UNT-IOM-6
During dehumidification, when the fan is on Auto, the fan speed can
switch depending on the error. Fan speed increases as the space
temperature rises above the active cooling setpoint.
Table 21. Fan Configuration
Auto fan operation Fan speed default
Heating Continuous Off
Low
Medium
High
CoolingContinuous Off
Low
Medium
High
Additional flexibility built into the controller allows you to enable or
disable the local fan switch input. The fan mode request can be either
hardwired or communicated to the controller. When both are present,
the communicated request has priority over the hardwired input. See
the following tables.
Table 22. Local fan switch disabled or not present
Communicated fan speed input
Off
Low
Medium
High
Auto (or not present)
Auto (fan runs at the default speed)
Table 23. Local fan switch enabled
Communicated Fan switch (local)
fan speed input
Off Ignored
Low Ignored
Medium Ignored
High Ignored
Auto Off
Low
Medium
High
Auto Off
Low
Medium
High
Auto (configured default, determined by heat/cool mode)
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Fan operation
Off
Low
Medium
High
Fan operation
Off
Low
Medium
High
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