Carrier XPOWER 42ADF025 Service Manual page 33

Control
The cold draft prevention function for heating is
applicable during heating operation, and the indoor fan
operates as shown below.
This condition applies identically to both normal heating
operation and after returning from defrost activity.
See picture in the next page.
As for the cold draft prevention mechanism for heating, it
alters the fan speed to a setting lower than the present
setting.
When defrost is active, the indoor fan turns off.
33