For this type of system, you will want to configure your Pelican thermostat for one (1) fan speed since it does not directly control the different fan speeds.
Note: If you have a PEARL economizer controller managing the outside damper, you will still need to turn Variable Speed Fan ON and configure into the PEARL what speed the unit runs the supply fan for each active cycle. This allows the PEARL to provide the correct ventilation as the supply fan’s speed adjusts.