Comfort Alert Diagnostics Key for Use With Copeland Scroll Ultratech Compressors, Use with Class 2 Circuits Only, Supply 24 VAC, 50/60 Hertz, Power: 1.5VA, Two Stage Control, DC Sol Operating Range: 4-18VDC, Compressor Second Stage Is Energized When Y & Y2 Are 24VAC and No Alerts rr Trips Are Active, Green LED: 24VAC Power, Yellow LED: Flash Code, Red LED: Protector Open or No Compressor Power, Weight: 1-Oz, Dims: 4-1/2"H X 2-1/2"W X 1-7/8"D, Alt42-101504-02