Johnson Controls WHA-P399-200 Wiring Harness

The Johnson Controls WHA-P399-200 Wiring Harness is a 6.6ft pressure transducer cable engineered specifically for the P399 series electronic pressure transducers. As a veteran-grade HVACR replacement part, this harness provides the critical ratiometric signal interface required for precise refrigerant pressure monitoring in commercial refrigeration and air conditioning systems. The WHA-P399-200 is technically identical to the WHA-P399-200C and features a high-reliability Packard connector with pigtail leads for seamless integration into control circuits.

Designed to withstand harsh mechanical rooms, the shielded 3-wire cable minimizes electromagnetic interference (EMI), ensuring a stable 0.5 to 4.5 VDC output. Field technicians should note that while this 2.0-meter sensor connector cable is standard for most PENN pressure controls, it can be extended up to 250 feet using 22 AWG shielded wire without compromising the ratiometric analog signal. Its rugged construction makes it suitable for use with all noncorrosive refrigerants and ammonia-based applications.

• Universal P399 Compatibility: Direct fit for the entire Johnson Controls P399 series, including 1/8 in. NPT and 1/4 in. SAE flare models.
• Interchangeable Design: Fully compatible with WHA-P399-200C and interchangeable with P499 series harnesses for enhanced field flexibility.
• Superior Shielding: Reduces signal noise and protects the 5 VDC supply voltage to maintain sensor accuracy in high-vibration environments.
• Industrial Durability: Environmentally sealed electronics and moisture-resistant jacket prevent failures caused by condensation or icing.

Is the WHA-P399-200 compatible with the newer P499 series?
Yes, those in the trade frequently use these harnesses interchangeably as the Packard connector pinout for the ratiometric 5 VDC power and signal return remains consistent across both the P399 and P499 series.

Can I use this harness for ammonia systems?
Absolutely. When paired with an ammonia-compatible P399 transducer, this wiring harness is rated for ammonia pressure sensing applications, provided all electrical piping is sealed to prevent migration.

What is the maximum distance I can extend this cable?
While the pre-terminated length is 6.6ft (2 meters), you can extend the leads using 22 AWG shielded cable. For most Johnson Controls setups, a maximum run of 250 feet is recommended to prevent voltage drop and signal degradation.

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.