Johnson Controls P352AB-3 Pressure Control

The Johnson Controls P352AB-3 is a professional-grade System 350 Electronic Pressure Control designed for precise on/off pressure management in commercial HVACR systems. Engineering to handle demanding applications like condenser fan cycling and compressor unloading, this module provides a 90 to 250 psi setpoint range and a field-adjustable 10 to 100 psi differential. Utilizing an SPDT relay output, it allows for versatile control of high-pressure refrigerant circuits and ensures electronic accuracy that traditional mechanical controls cannot match. The unit is typically powered by a 24 VAC source via a Y350R power module or a standard Class 2 transformer. Its modular design enables seamless DIN rail mounting and integration with S352 stage modules or D352 display modules. Featuring LED indication for real-time relay status and a rugged NEMA 1 high-impact thermoplastic enclosure, the P352AB-3 pressure control is the go-to standard for technicians requiring reliable pressure regulation and high-vibration stability in the field.

Key Benefits:

• Modular Scalability: Easily snaps together with other System 350 modules, reducing field wiring complexity and installation time.
• Selectable Action: Features a field-selectable Direct or Reverse Acting mode to suit both high-pressure cut-out and low-pressure cycle requirements.
• Precise Differential Control: The wide 10-100 psi adjustable differential prevents short-cycling, extending the life of compressors and fan motors.
• High Accuracy: Electronic sensing provides superior repeatability and tighter tolerances compared to traditional bellow-style pressure switches.
• Universal Mounting: Compact footprint supports both surface and 35 mm DIN rail mounting for flexible control panel layouts.

Common Questions:

What transducer is required for this control?
The P352AB-3 is designed to work with P399 series electronic pressure transducers, which provide the ratiometric analog signal necessary for the control to monitor system pressure accurately.

Can I use this for 460V fan motors?
The SPDT relay output is rated for pilot duty and standard inductive loads; for high-voltage or high-amperage fan motors, this control should be wired to pilot the coil of a properly rated definite purpose contactor.

Does it require a separate power supply?
Yes, the unit operates on 24 VAC. It can be powered directly from a transformer or via the 5-pin connector when plugged into a Y350R power module.

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.