Description
Johnson Controls P70AA-5 Single Pole Low Pressure Control Overview
The Johnson Controls P70AA-5 is a single-pole, single-throw (SPST) low pressure control engineered specifically for ammonia refrigeration systems. With a close-high/open-low switching action, this control protects equipment by opening the circuit when system pressure drops below the setpoint — a critical safeguard in industrial and commercial ammonia refrigeration applications.
Key Specifications
- Switch Type: Single Pole, Single Throw (SPST)
- Action: Close High / Open Low
- Pressure Range: 20″ WC to 100 PSI
- Differential Range: 6 PSI to 50 PSI
- Pressure Connection: 1/4″ Female NPT
- Maximum Overpressure Rating: 325 PSIG
- Refrigerant Compatibility: Ammonia (R-717)
Features & Benefits
- Wide pressure range (20″ WC to 100 PSI) accommodates diverse low-side refrigeration circuit requirements
- Adjustable differential (6–50 PSI) allows precise system tuning to minimize short-cycling
- 1/4″ Female NPT pressure connection ensures straightforward field installation with standard refrigeration fittings
- 325 PSIG maximum overpressure rating provides robust protection against pressure spikes
- Ammonia-compatible construction — materials and seals rated for use with R-717 refrigerant
- Close-high/open-low action provides reliable low-pressure cutout protection for compressors and system components
- Trusted Johnson Controls engineering for long-term reliability in demanding industrial environments
Typical Applications
- Industrial and commercial ammonia refrigeration systems
- Cold storage and food processing facilities
- Low-pressure cutout control on compressor suction circuits
- Ammonia chiller and evaporator circuits requiring low-pressure safety switching
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