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Fig. 8 — PremierLink™ Controller Wiring — Combination Temperature and CO
2
Sensor —
33ZCT55CO2, 33ZCT56CO2
NOTE: No wire is connected to connector J-5 pin 4. You must relocate a wire from
an unused terminal. Typically one of the red wires from connector J-4 may be used
for this purpose. This pin on J-5 provided 24 VDC power to the combo sensor.