Refcomp inverter controls

Please help me out with understanding analog outputs from Carell controller:
Y1 is going out to EXV driver
Y2 is the demand signal to Refcomp inverter
Y3 is the demand signal to condenser fan motors inverter

Not sure what is the function of Y1 signal here.
Anyone has any suggestions?

Thank you

What Carel controller do you have? and what unit is it for?

I would assume that it is the setting signal to the EEV.