Before the thermostat starts “Free cooling”, change the following extended configuration:
- Set terminal input X1 or X2 to “Outside air temperature”.
- Set input “Aux Out W3/UNIV” to “Outside air damper”.
- Select “Advanced Settings” > “Optimization”, select “Yes” and set “Min.diff.room temp./outs.air temp.f.cool” for “Free cooling” to the desired value.
See system setup in Commissioning for more information on configuration changes.
When the temperature differential value (outside temperature minus room temperature) is higher than or equal to “Min.diff.room temp./outs.air temp.f.cool”, the thermostat starts cooling. When the temperature differential value is below “Min.diff.room temp./outs.air temp.f.cool”, the thermostat stops cooling.
You can adjust “Min.diff.room temp./outs.air temp.f.cool” to influence “Free cooling”.