Description
The Johnson Controls P74AA-1 is a heavy-duty differential pressure control engineered for precise pressure monitoring and switching in commercial and industrial HVAC and refrigeration systems. With a single-pole, single-throw (SPST) configuration that closes on a decrease in pressure difference, this control is ideal for applications requiring reliable low-differential-pressure detection and system protection.
Key Features
- SPST switching action — closes on decrease in pressure difference for reliable system response
- Wide adjustable range pressure differential: 8 PSI to 70 PSI
- Adjustable switch differential: 8 PSI to 30 PSI for fine-tuned control
- 36″ capillary tubing provides flexible installation reach
- 1/4″ flare nut connection for secure, leak-free hookup
- Stainless steel construction for durability and corrosion resistance
Product Specifications
- Manufacturer: Johnson Controls
- SKU / Part Number: P74AA-1
- Switch Type: SPST (Single-Pole, Single-Throw)
- Switching Action: Closes on Decrease in Pressure Difference
- Adjustable Range Pressure Differential: 8 PSI – 70 PSI
- Adjustable Switch Differential: 8 PSI – 30 PSI
- Capillary Length: 36 inches
- Connection Type: 1/4″ Flare Nut
- Wetted Parts Material: Stainless Steel
Applications
- Commercial HVAC systems requiring differential pressure monitoring
- Refrigeration equipment protection and control
- Compressor and pump protection circuits
- Industrial process control where pressure differential switching is required
The P74AA-1’s broad 8–70 PSI adjustable range and 8–30 PSI switch differential make it a versatile solution across a wide variety of system pressures. The 36″ capillary with 1/4″ flare nut connection simplifies field installation, while stainless steel wetted components ensure long-term reliability even in demanding environments. Trust Johnson Controls engineering to deliver consistent, repeatable performance in your pressure control applications.
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