The Silent Killer: How High Moisture in Refrigerant Destroys HVAC Equipment (And Puts Your Business at Risk)

Introduction

The HVAC industry is currently flooded with sub-par refrigerant. On the surface, cheap or improperly refined gas seems like an easy way to protect margins in a competitive market. The system charges up fine, pressures look normal, and the unit cools.

However, hidden inside that gas is a silent killer: excessive moisture.

While low-grade refrigerant works in the short term, high moisture content triggers a chemical chain reaction that breaks down your equipment from the inside out. When the system inevitably fails months down the road, your customer won't blame the gas distributor—they will blame the contractor who put it in.

What Moisture Does to HVAC Systems Long-Term

Refrigerant systems are designed to operate in a completely dry, closed environment. When sub-par gas introduces moisture above AHRI-700 limits (generally >10 ppm depending on the refrigerant type), the internal chemistry breaks down rapidly:

1. Acid Formation and Compressor Burnout

Synthetic lubricants like Polyolester (POE) oil are highly hygroscopic—meaning they aggressively absorb water. When water mixes with refrigerant fluorocarbons and oil at high operating temperatures, a process called hydrolysis occurs. This reaction generates severe acids (hydrofluoric and hydrochloric acid).

These acids circulate through the system, slowly dissolving the lacquer varnish on the compressor motor windings. Once the insulation wears thin, the motor shorts to ground, resulting in a total compressor burnout.

2. Oil Sludging and Mechanical Breakdown

As acid breaks down the compressor oil, the oil loses its lubricity and oxidizes, turning into a thick, dark sludge. This sludge clogs tiny oil passages, starves bearings, and leaves sticky varnish on metal surfaces. Without proper lubrication, internal friction spikes, operating temperatures skyrocket, and mechanical components seize.

3. Expansion Valve (TXV) Freeze-Up

Because moisture cannot stay dissolved in cold liquid refrigerant, free water separates out at the expansion device. As high-pressure liquid drops to low pressure across the expansion valve (TXV or capillary tube), the sudden temperature drop turns that free water into ice. Ice crystals restrict or block the orifice, causing erratic system pressure, loss of cooling, and severe liquid flood-back to the compressor.

4. Copper Plating and Corrosion

Acidic moisture chemically strips copper from line sets and heat exchanger tubing. This copper travels in solution and deposits itself onto hot, precision-machined steel parts—like compressor shafts, pistons, and valve plates. Known as "copper plating," this build-up tightens clearances, causes binding, and weakens thin copper walls, eventually leading to unlocatable refrigerant micro-leaks.

The Contractor's Liability: Who Pays for the Damage?

When a 2-year-old compressor suffers a total acid burnout due to contaminated refrigerant, the manufacturer warranty inspection will easily detect acid contamination and oil breakdown. Warranty claims get denied due to "system contamination."

At that point, the financial responsibility lands squarely on the installing or servicing contractor. You face:

• Out-of-pocket costs for expensive compressor or full-system replacements.

• Unbillable labor hours spent flushing contaminated lines.

• Irreparable harm to your company's reputation and customer trust.

  
  

Protecting Your Business: Demand a Certificate of Analysis (COA)

You wouldn't put dirty fuel into a high-performance vehicle; you shouldn't put uncertified refrigerant into your customers' equipment.

What is a COA?

A Certificate of Analysis (COA) is a batch-specific lab report verifying that a cylinder of refrigerant meets strict purity thresholds outlined by AHRI Standard 700. It details exact levels of:

• Moisture content (parts per million)

• Non-condensable gases (air/nitrogen content)

• High-boiling residues (oil/dirt contaminants)

• Acidity levels

If a supplier or distributor cannot or will not provide a COA tied to the batch number on your cylinder, do not put that gas into a system.

The FluoroFusion Advantage: US-Manufactured Purity

At FluoroFusion, we believe contractors shouldn't have to guess whether their gas will destroy a compressor.

We manufacture and refine our refrigerants right here in the United States to true refrigerant-grade purity. Every cylinder leaving our facility undergoes rigorous testing to guarantee moisture and contaminant levels fall well below maximum allowable limits.

Protect your reputation, eliminate call-backs, and safeguard your liability by specifying American-made, COA-backed refrigerant from FluoroFusion.

Ready to upgrade your gas quality? Contact FluoroFusion today to view our lab test results or request COAs for your next order.