Johnson Controls GLAS - Terminal Descriptions; Thermostat Terminal Functions

Terminal descriptions
Note: If you have only one R wire, connect to RC.
Note: If you are replacing an existing thermostat, remove any jumper wires between
R and RH or RC and RH.
Y First stage of cooling or rst stage heat pump
Y2 Second stage of cooling command or second stage heat pump
W First stage of conventional heating or rst stage auxiliary heat for heat pump
systems
W2 Second stage of conventional heating or second stage of auxiliary heat for
heat pump system