Johnson Controls P74JA-2 Differential Pressure Control

The Johnson Controls P74JA-2C is a differential pressure control designed to measure the pressure difference between two points, such as supply and return lines. When a change in differential pressure occurs, it adjusts the switching mechanism to initiate corrective actions in connected control equipment.

Key Features:

• Switch Action: Single-Pole, Double-Throw (SPDT) floating.
  

• Pressure Differential Range: Adjustable from 8 to 60 psi (55 to 414 kPa).

• Fixed Switch Differential: 2.5 psi (17 kPa).
  

• Pressure Connections: Equipped with 1/4 inch male flare fittings.

• Bellows Material: Constructed with brass for durability.

• Electrical Rating: Rated at 1 Amp for 24 VAC, suitable for Class 2 circuits operating at 50/60 Hz.

• Applications:

  The P74JA-2C is commonly used for:
  

  • Positioning M100 Series motor-actuated valves.

  • Proving pump operation.
    

  • Sensing differential pressure in chillers or water-cooled condensers.

  Additional Features:

  • Incorporates a field-proven Penn switch with a fully enclosed contact mechanism.

  • Allows for easy adjustment of the pressure differential setting without removing the cover.