A28AA-4 | 30/110F 2-STG COIL-BULB,2-SPDT | Johnson Controls Pressure_0.60IN Water Column **Our trusted HVAC store: Your

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A28AA-4 | 30/110F 2-STG COIL-BULB,2-SPDT | Johnson Controls Pressure_0.60IN Water Column **Our trusted HVAC store: Your**A28AA 4 Johnson Controls** The A28AA 4 coil bulb assembly from Johnson Controls is a robust and reliable component for HVAC applications. Its 30 110F temperature range and 2 SPDT (single pole, double throw) configuration make it suitable for various cooling and heating systems. The coil bulb is designed to operate on 24V AC power and has a compact size for easy installation. It acts as a sensing element, detecting temperature changes and