Terminal descriptions
Note: If you have only one R wire, connect to RC.
Note: If you are removing an existing thermostat, remove any jumper wires between R and
RH or RC and RH. You will not need these for GLAS.
Y1
First stage of cooling or first stage heat pump
Y2
Second stage of cooling or second stage heat pump
W1
First stage of conventional heating or first stage auxiliary heat for heat pump systems
W2
Second stage of conventional heating or second stage of auxiliary heat for heat
pump systems
G
Fan
4
GLAS smart thermostat installation instructions -
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2018 Johnson Controls