Johnson Controls P100AC-2 Pressure Control

The Johnson Controls P100AC-2 Encapsulated Pressure Control is a rugged, direct mount pressure switch engineered for low pressure cutout and condenser fan cycling in commercial refrigeration and HVAC systems. As a veteran-grade SPST open-low control, this unit is factory-calibrated for precision, featuring a fixed open at 15 PSIG and close at 30 PSIG setpoint. Its encapsulated, dust-tight construction ensures reliable performance in demanding environments, making it a staple for technicians servicing ice machines, food service equipment, and computer room air conditioning units. Designed for automatic reset, the P100AC-2 utilizes a stainless steel, snap-acting disc to provide high-speed contact separation, effectively preventing arcing and ensuring long-term contact life.

This refrigerant pressure limiting device is compatible with all non-corrosive refrigerants and features 120/240 Vac contact ratings (5.8 FLA at 120V) to handle pilot duty or direct motor loads. The compact, lightweight design allows for direct mounting to refrigeration piping via a 1/4 in. SAE brass female flare fitting with an internal Schrader valve depressor. Integrated with a conduit clamp for 3/8 in. flexible metal conduit, the P100AC-2 simplifies field wiring while maintaining a tamper-proof, vibration-resistant profile that eliminates the need for additional mounting brackets.

• Direct Mount Efficiency: Eliminated mounting brackets reduce installation time and save space in tight mechanical compartments.
• Broad Compatibility: Rated for use with all common non-corrosive refrigerants across diverse cooling applications.
• Snap-Action Reliability: The stainless steel snap-acting disc ensures precise, repeatable pressure control without mid-point fluttering.
• High Load Rating: Supports 120/240 Vac electrical ratings, making it suitable for both pilot duty and fractional horsepower motor control.
• Environmental Protection: Encapsulated open construction prevents dust and moisture ingress, protecting the internal SPST switch mechanism.

What is the primary application for an "open low" switch?
In high-side or low-side circuits, an open-low action like the P100AC-2 is typically used as a low pressure cutout to prevent compressor operation during loss of charge or as a condenser fan cycling control to maintain head pressure.

Does the P100AC-2 require manual intervention after a trip?
No, this model features an automatic reset. Once the system pressure rises back to the 30 PSIG closing point, the internal contacts will automatically re-engage.

Can I use this control with corrosive refrigerants or fluids?
This Johnson Controls pressure switch is specifically designed for non-corrosive refrigerants and fluids. For corrosive applications, a control with compatible wetted parts must be used to prevent premature failure.

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.