Johnson Controls T7200-TB21-9JS0 Thermostat Wiring Diagrams & Terminal Mapping

Johnson Controls T7200-TB21-9JS0 Thermostat Wiring Diagrams & Terminal Mapping

Main Power & Output Terminal Block (Left Green Block)

• N: Neutral Line Input.
• L (Arrow pointing in): Line/Hot Power Input (100–240V AC).
• R1: Relay Output 1 (Typically assigned to the cooling valve).
• R2: Relay Output 2 (Typically assigned to the heating valve in a 4-pipe system configuration).
• R3: Relay Output 3 (Auxiliary stage/secondary device control). 

Low Voltage Control Block (Bottom Right Pins)

• AO: Analog Output (Provides the 0–10V DC variable voltage signal to control electronically commutated ECM fan motor speeds smoothly).
• OCC: Occupancy Input (Dry-contact terminal used for automated energy-saving triggers via hotel key cards or motion sensors).
• GND: Signal Ground (The shared baseline/reference ground for your low-voltage control signals). 

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