Typical Connection Between
Thermostat and Equipment
• C: 24 VAC Common
• R: 24 VAC
• Y1: 1
st
stage cooling
• E/W1: Emergency heat / 1
st
stage heating
• W2: 2
nd
stage heating
• Y2: 2
nd
stage cooling
• L: System fault indicator
• O: Cool active reversing valve
• B: Heat active reversing valve
• G: Fan
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