Johnson Controls P499AAP-105 Pressure Transducer

The Johnson Controls P499AAP-105 is a professional-grade electronic pressure transducer engineered for high-accuracy performance in demanding commercial refrigeration and HVAC/R environments. Featuring a 0-500 PSI pressure range and a standard 4-20 mA output signal, this Style 49 sensor is a direct-mount solution designed for immediate integration into control loops. The unit is constructed with a single-piece 17-4PH stainless steel pressure port, effectively eliminating the risk of refrigerant loss typically associated with O-ring or weld failures. This precise HVAC pressure sensor is digitally compensated to maintain a 1% total error band, even when subjected to wide ambient temperature swings, high humidity, or the freeze/thaw conditions common on suction lines. The compact, slender body allows for installation using deep-socket wrenches in tight mechanical spaces with zero turning radius. This model is technically identical to the P499AAP-105C, ensuring consistent refrigeration pressure monitoring and compatibility with ammonia and other non-corrosive refrigerants.

Key Benefits

• Durability: Machined 17-4PH stainless steel construction offers superior resistance to physical shock, vibration, and pressure pulsations.
• Leak-Proof Design: The all-metal sealed system contains no organic materials or internal welds exposed to the media, preventing common failure points.
• Environmental Protection: Encapsulated electronics withstand moisture, condensation, and icing for long-term reliability in harsh mechanical rooms.
• Broad Compatibility: Suitable for use with most non-corrosive refrigerants, ammonia, water, glycol, and carbon dioxide.
• Standard Output: The 4-20 mA current loop provides a linear analog signal that is less susceptible to electrical noise over long wire runs.

Common Questions

What is the difference between the P499AAP-105 and P499AAP-105C?
These parts are functionally and physically identical. The "C" suffix typically denotes a commercial individual pack, but specifications for the 0-500 PSI range and 4-20 mA output remain exactly the same.

Does this transducer include the wire harness?
The P499AAP-105 is an individual transducer with a Packard electrical connection. If you are performing a new installation rather than a direct replacement, a separate WHA-PKD3 series wire harness is required.

How do I verify the accuracy of the signal?
Technicians should measure the DC current in the loop using a multimeter. At 0 PSI, the signal should read 4 mA, and at the 500 PSI limit, it should reach 20 mA. Ensure the supply voltage is between 9-30 VDC for proper operation.

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.