Nu-Calgon 4320-W8 Acid Test Kit

The Nu-Calgon 4320-W8 Phase III Acid Test Kit is a critical diagnostic tool for field technicians to quantify acid contamination in HVACR systems. Unlike basic indicators, this kit utilizes phase separation technology to provide a clear, undeniable color change in the acid indicator layer, eliminating guesswork during service calls. As the direct replacement for 064427, it is engineered for universal compatibility with mineral oil, alkylbenzene, and polyolester (POE) oils. By measuring the precise acid numberùthe milligrams of potassium hydroxide (KOH) required to neutralize one gram of oilùtechnicians can identify inorganic acid buildup before it leads to compressor burnout. The Phase III refrigeration oil test is calibrated to industry standards, utilizing a 0.05 mg KOH/g threshold for mineral/AB oils and 0.16 mg KOH/g for POE. The two-bottle design features secure screw caps, removing the safety hazard of breaking glass ampoules on the job site.

• Universal Oil Compatibility: Validated for use with MO, AB, and POE lubricants, making it the only HVAC acid test kit needed on the truck.
• Precise Acid Neutralization: Employs a specific KOH titration method to detect acid contamination levels that exceed manufacturer limits.
• Visual Accuracy: Phase separation ensures the oil and test solution remain distinct, allowing the purple-to-pink/clear color-change indicator to be easily read even in dark environments.
• Field Safety: Screw-cap bottles eliminate the risk of lacerations associated with traditional glass-break kits.
• Preventive Maintenance: Essential for verifying system health after a burnout or during routine annual inspections to protect compressor longevity.

Can I use the Phase III kit on systems currently running on R-410A with POE oil?
Yes. This kit is specifically formulated to handle the higher acid number thresholds required for POE oils and is fully compatible with both HFC and HCFC system lubricants.

What does it mean if the oil remains purple after the test?
If the solution stays purple, the acid level is within the acceptable rangeùbelow 0.05 mg KOH/g for mineral/AB or 0.16 mg KOH/g for POEùindicating the oil is still chemically stable.

Does this kit work with the new A2L mildly flammable refrigerants?
As long as the lubricant type is MO, AB, or POE, the chemical reaction for acid detection remains accurate, though always ensure proper ventilation and safety protocols for the specific refrigerant in use.

Warning

Cancer and Reproductive Harm - www.P65warnings.ca.gov

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.