Johnson Controls A25CP-1 Limit Control

The Johnson Controls A25CP-1 is a robust manual reset high limit control engineered for critical over-temperature protection in warm air applications, such as furnaces, duct heaters, and industrial heating plants. As the direct replacement for A25AP-1, this mechanical switch operates on a liquid-filled sensing element, requiring no external power to trigger its safety function. The unit features an adjustable setpoint range of 25°F to 215°F with a factory-calibrated high limit set at 125°F. Its SPDT (Single-Pole, Double-Throw) contact configuration provides versatile wiring options for 24V, 120V, or 240V control circuits, supporting voltage compatibility from 24 to 277 VAC. Designed for reliability in demanding environments, it includes a concealed screwdriver slot to prevent unauthorized setpoint tampering and is Factory Mutual (FM) Approved. This surface-mount control ensures the system remains locked out following a high-temperature excursion, requiring a manual technician intervention for safety verification before restarting operations.

Key Benefits for Contractors

• Universal Voltage Application: Rated for 24 to 277 VAC, allowing a single A25CP-1 to service a wide range of residential and commercial equipment.
• Enhanced Safety Compliance: The manual reset functionality meets strict safety protocols by preventing automatic equipment restarts after a thermal trip.
• Tamper-Resistant Design: The internal screwdriver slot adjustment ensures that once the high limit is set, it stays protected from accidental or unauthorized changes.
• Mechanical Reliability: Operates independently of system power, ensuring the high limit protection remains active even during partial electrical failures.
• Proven Performance: FM Approved construction ensures the control meets rigorous industrial standards for high limit temperature monitoring.

Common Questions

Is the A25CP-1 a suitable replacement for the older A25AP-1 model?
Yes, the A25CP-1 is the designated direct replacement for the discontinued A25AP-1, maintaining the same mounting footprint and technical specifications for seamless field retrofits.

Can this control be used for fan cycling?
No, this is a manual reset high limit control. It is designed to break the circuit upon reaching a high-temperature threshold and will not reset until the temperature drops below the setpoint and the reset button is manually depressed.

What is the maximum ambient temperature for the switch enclosure?
The Johnson Controls A25 series enclosure is typically rated for ambient temperatures up to 140°F (60°C) to ensure the internal SPDT switch integrity and reliable trip points.

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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.