Selecting Fan Speed (For 2 And 3 Fan Speeds Configuration); Turning Auto Fan On Or Off (Fan On Demand) - Carrier ComfortVu TB-24-HM Installation And Operation Manual

Selecting fan speed (for 2 and 3 fan speeds configuration)

Press the [Fan] button to switch between fan speeds.
Notes:

In Auto speed, the active fan speed icon will appear on display.

Medium speed available in 3 speeds configuration.

Auto Speed in AC configurations: the differential parameter
(speed change between stages) is determined by constant
0.7°C (1.4°F)

Auto Speed in FC configurations: the differential parameter is
determined by object AV#59 –DifferentialOnOffFanSpeed

Turning Auto fan ON or OFF (fan on demand)

In 1-speed configuration:
Press the [Fan] button to turn Auto fan ON or OFF.
In 2- and 3-speed configurations:
Press and hold the [Fan] button for 7 seconds to turn Auto fan ON
or OFF.

When ON, the fan will run on demand for cooling or heating.

When OFF, the fan will run continuously.
Note: Auto fan cannot be selected in Fan only mode.
ComfortVu™ BACnet Thermostat Model Standard TB-24-HM (24 Vac)Carrier Proprietary and Confidential
Installation and Operation Guide
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