Johnson Controls MS4DR24T-11 Control

The Johnson Controls MS4DR24T-11 (identical to the MS4DR24T-11C) is a high-performance multi-stage electronic temperature control designed for precise climate management in commercial HVACR applications. This versatile DIN rail mount control operates within a temperature range of 14 to 140°F, making it an ideal solution for walk-in coolers, chillers, and space heating systems. It includes the A99BB-200 PTC silicon sensor, ensuring accurate thermal feedback and reliable cycling. The unit features four SPDT relay outputs, allowing for complex staging sequences and alarm configurations. Built to handle environments with 0 to 95% non-condensing humidity, this digital thermostat controller provides contractors with a robust alternative to mechanical controls. Its 24V AC power supply requirement and intuitive programming interface simplify field installation, while the compact footprint ensures compatibility with standard electrical enclosures for streamlined HVAC system integration.

• Precision Staging: Four independent stages allow for granular control over multiple compressors, fans, or heating elements.
• Simplified Installation: Standard DIN rail mounting reduces labor time and organizes control panels more efficiently.
• Field Reliability: The included A99BB-200 sensor utilizes PTC technology for stable resistance over long cable runs.
• Universal Versatility: Functions as a direct replacement for the MS4DR24T-11C, maintaining identical specifications and footprint.

Can the MS4DR24T-11 be used for both heating and cooling?
Yes, each stage can be independently configured for heating or cooling modes, providing flexible setpoints and differential adjustments for complex HVACR sequences.

How do I handle sensor error codes on this control?
An "SF" or "OP" code typically indicates a sensor failure or open circuit. Ensure the A99BB-200 sensor leads are securely seated and check the resistance against the standard PTC temperature curve.

What is the maximum distance for the sensor lead extension?
The A99 series sensors can be extended up to several hundred feet using 18 AWG shielded cable, provided the connections are soldered and moisture-sealed to prevent resistance drift.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.