"Purging" is the process of clearing an air conditioner's (AC's) unit's internal lines and hoses. This is frequently done before recharging freon but. many newer model AC units, such as Honeywell units, purge the system on startup. That being said, you can still manually purge the system on a Honeywell AC controller and it can all be done right from the controller.
Power on your Honeywell AC system by pressing the "Heat" or "Cool" button on the front of the unit.
Press the "Purge" button on the front of the unit and the circular LED indicator light next to it will flash,signaling that the unit is in purge mode.
Wait until the display screen on the controller informs you that the purge is complete. This will take about three minutes.