Johnson Controls P100DA-81 Pressure Control

For contractors managing high-pressure refrigeration and air conditioning systems, the Johnson Controls P100DA-81 provides a reliable, fixed-setpoint solution for critical safety cutouts. This encapsulated pressure control features a Single-Pole Single-Throw (SPST) switch designed to open on pressure rise at 630 PSIG, making it ideal for R410A high-pressure cutout applications. Built with open construction for direct mounting, the unit eliminates the need for additional mounting brackets, facilitating a faster installation on the high side of the system. The P100DA-81 is technically identical to the P100DA-81C and is frequently used to protect compressors from excessive head pressure.

Engineered for durability, the P100DA-81 utilizes a lockout manual reset mechanism, ensuring that the system remains off following a high-pressure event until a technician can inspect the equipment and manually depress the reset button. The 120/240 Vac contact ratings allow for direct control of small motors or pilot duty integration into larger control circuits. With a 1/4 inch SAE female flare fitting and an internal Schrader valve depressor, this direct mount pressure switch integrates seamlessly into existing refrigerant lines, providing precise, repeatable performance in demanding ambient conditions.

Key Benefits

• Compact Encapsulated Design: Lightweight, tamper-proof construction allows for direct mounting to refrigerant piping, saving space in tight condenser cabinets.
• Integrated Safety Lockout: The manual reset feature prevents automatic restarting after a high-pressure trip, protecting the compressor from repeated cycling under fault conditions.
• Simplified Installation: Features a 1/4 inch SAE female flare with a Schrader valve depressor for immediate attachment to standard service ports without refrigerant loss.
• High Pressure Compatibility: Specifically calibrated for 630 PSIG, making it a standard choice for R410A refrigeration systems and high-side safety limits.
• Versatile Electrical Ratings: Supports both 120V and 240V circuits, providing flexibility for various HVACR equipment configurations.

Common Questions

Is the P100DA-81 adjustable in the field?
No, this model features factory-calibrated, non-adjustable setpoints to ensure accurate and tamper-proof operation at 630 PSIG.

What is the difference between the P100DA-81 and the P100DA-81C?
These two part numbers are functionally and physically identical; the "C" suffix typically denotes bulk packaging for OEMs or specific regional distribution channels.

Can this switch be used on the suction side for low-pressure cutout?
No, the P100DA-81 is designed to open on pressure rise at high thresholds (630 PSIG). For low-pressure applications, a control that opens on pressure drop should be used.

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.