The Johnson Controls T-4506-203 Room Thermostat is a high reliability day/night direct-acting thermostat ideal for dependable temperature control in HVAC applications. In an effort to maintain the highest level of comfort and efficiency the dial on this thermostat has been developed to offer fine adjustments in numerous heating, ventilating and air conditioning applications. Depending on the set start temperature of a control system, the thermostat alters the control pressure acting on a pneumatic valve or an actuator. It maintains the pressure setting at 15 PSIG in the day to ensure that heating, ventilation and air conditioning continues to operate optimally as well as keep the required room temperature.
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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