How does a PEARL control a Variable Speed Fan (VFD)?

The PEARL allows for up to five (5) fan speeds, which change based on how many stages of heating or cooling are active or if just the fan is running. These are fixed speed adjustments.

Variable Speed Fan control by a Pelican PEARL controller.

These configurations can be found in the Pelican Web-App > Admin > Thermostat Configuration > ‘select any thermostat‘ > Variable Speed Fan.

Note: These configuration is only available for Pelican thermostats that are wired to a Pelican PEARL.

Each of the below configuration are set in percentages from 0% to 100%: where 0% equals a 0 Vdc output from the PEARL’s (A2) correlating to the the fan being at 0% speed and 100% equals a 10 Vdc output from the PEARL’s (A2) and the fan is at 100% speed.

Configuration options and meanings:

Cool Fan Speed – Stage 1: This tells the PEARL what the fan speed should be set to when 1st stage cooling is enabled.

Cool Fan Speed – Stage 2: This tells the PEARL what the fan speed should be set to when 2nd stage cooling is enabled.

Heat Fan Speed – Stage 1: This tells the PEARL what the fan speed should be set to when 1st stage heating is enabled.

Heat Fan Speed – Stage 2: This tells the PEARL what the fan speed should be set to when 2nd stage heating is enabled.

Ventilation Fan Speed: This tells the PEARL what the fan speed should be set to when only the fan is enabled.

Note: The available number of configuration options provided under Variable Speed Fan, will automatically adjust based on how many stages of heating and/or cooling the thermostat is configured to control.