Johnson Controls T-4506-203 Direct Acting Room Thermostat Day/Night

T-4506-203 Johnson Controls Thermostat

The Johnson Controls T-4506-203 stands out as a robust, dual-temperature, dual-dial pneumatic thermostat designed for high-volume HVAC applications. Featuring horizontal mounting capabilities, it seamlessly integrates onto walls or equipment surfaces. The Fahrenheit dial ensures temperature visibility in degrees Fahrenheit. As a direct-acting model, the T-4506-203 Johnson Controls thermostat relies on air pressure to precisely control valves or dampers. Notably, the absence of an indexing switch distinguishes it from other T-4506 models, omitting manual override functionality for one setpoint. 

In terms of performance, this thermostat is optimized for commercial and industrial settings, boasting a high volume output suitable for managing substantial airflows. With a 400 SCIM flow capacity, it can handle rates up to 400 standard cubic inches per minute while maintaining an economical 20 SCIM air consumption. The thermostat's temperature range spans 55-85°F, providing versatility for various HVAC system configurations.

Key features:

• Dual temperature control: Independently manages two setpoints, typically for daytime and nighttime temperatures.
• Dual dial adjustment: Separate dials for each setpoint allow for precise temperature control.
• Pneumatic operation: Uses compressed air to regulate damper or valve position, adjusting airflow and room temperature.
• NEMA 1 enclosure: Protects internal components from dust and moisture.
• Adjustable switch point: This can be set to activate heating or cooling at different temperatures.
• Durable construction: Built to withstand demanding HVAC environments.

Signs of a Faulty Johnson Controls Thermostat

Temperature control issues:

• Inconsistent temperature: The room temperature doesn't reach or maintain the desired setpoints, fluctuating significantly or remaining off target.
• No temperature change: The thermostat doesn't trigger heating or cooling even when the temperature deviates from the setpoints.
• Uneven temperatures in different zones: If used for zone control, temperatures might differ significantly between areas controlled by the T-4506-203.

Operational problems:

• Erratic dial movement: The setpoint dials might feel loose, turn stiffly, or not adjust the temperature settings properly.
• Leaks: Air leaks around the thermostat housing or connections could indicate internal damage or seal failure.
• Excessive noise: Uncharacteristic hissing, clicking, or other sounds emanating from the thermostat might suggest internal component malfunction.

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