Johnson Controls P29AC-3 Cutout Control

The Johnson Controls P29AC-3 is a professional-grade low pressure cutout control designed to provide reliable protection for chiller systems and commercial refrigeration compressors. This unit is built to monitor system pressure and initiate a shutdown if the suction pressure remains below the specified setpoint for a sustained period. It features a range of 20 inches Hg to 100 PSIG, allowing for precise adjustment across various cooling applications. The integrated 90-second time delay is a critical safety feature that prevents nuisance tripping caused by momentary pressure fluctuations during startup or heavy load changes. As a versatile 120/240 Vac component, the P29AC-3 is electrically identical to the P29AC-3C, ensuring seamless integration into existing control circuits. This HVAC pressure switch utilizes an auto recycle mechanism, which automatically resets the system once pressure returns to safe operating levels, reducing downtime and the need for manual intervention by the technician.

• System Protection: Effectively monitors for low pressure cutout to prevent compressor damage during loss of charge or freeze-up conditions.
• Minimized Shorth-Cycling: The 90-second time delay relay ensures the equipment only shuts down for legitimate, sustained pressure drops.
• Enhanced Durability: Equipped with heavy-duty pressure elements that withstand high overrun pressures often encountered during system testing.
• Ambient Compensation: The internal thermal timing mechanism is compensated to maintain accuracy despite temperature variations at the mounting location.
• Installation Flexibility: Dual-voltage 120/240 Vac compatibility and a simple single-pointer scale for straightforward setpoint calibration.

Is the P29AC-3 a manual or automatic reset control?
This specific model features an auto recycle function, meaning it will automatically resume operation once the pressure rises above the differential, unlike manual reset "NC" models.

Can this be used for oil pressure safety?
While the P29 series is often used for oil, the P29AC-3 is primarily configured for low suction pressure monitoring in chiller and refrigeration applications.

How do I adjust the pressure setpoint?
Technicians can adjust the setting by turning the screw at the top of the housing; a single pointer on the internal scale indicates the current cutout value.

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.