Johnson Controls P70AA-2 Single Pole High Pressure Control Overview
The Johnson Controls P70AA-2 is a single-pole, single-throw (SPST) high pressure control engineered for head pressure fan cycling applications using R-12 refrigerant. Designed with a close-on-high, open-on-low switching action, this control provides reliable, automatic pressure-based switching to protect refrigeration and air conditioning systems from damaging high-pressure conditions.
Key Features
- SPST (Single Pole, Single Throw) switching configuration — Close High, Open Low
- Operating pressure range: 0 PSI to 150 PSI
- Adjustable differential: 12 PSI to 40 PSI
- Maximum overpressure rating: 525 PSIG for enhanced system protection
- 36″ capillary tube for flexible installation and remote sensing
- 1/4″ flare nut pressure connector for secure, leak-free connections
- Designed for head pressure fan cycling with R-12 refrigerant systems
Specifications
- SKU: P70AA-2
- Brand: Johnson Controls
- Switch Type: SPST
- Switching Action: Close High, Open Low
- Pressure Range: 0 PSI – 150 PSI
- Differential Range: 12 PSI – 40 PSI
- Maximum Overpressure: 525 PSIG
- Capillary Length: 36 inches
- Pressure Connection: 1/4″ Flare Nut
- Refrigerant Compatibility: R-12
- Application: Head Pressure Fan Cycling
Application & Benefits
The P70AA-2 is ideal for commercial refrigeration and HVAC systems requiring precise head pressure management. The close-high, open-low action automatically cycles condenser fans in response to rising system pressure, helping maintain optimal condensing conditions and system efficiency. The wide adjustable differential range (12–40 PSI) allows technicians to fine-tune control response to match specific system requirements. The 525 PSIG maximum overpressure rating ensures durability and safety even in demanding operating environments. The 36″ capillary with 1/4″ flare nut connector simplifies field installation and provides reliable pressure sensing at the point of measurement.
