Formicary Corrosion
Date: 22-01-2024
Formicary corrosion an escalating concern in HVAC systems, is increasingly affecting copper components amid shifting environmental dynamics. The confluence of these changing conditions creates an ideal environment for accelerated corrosion. In light of this, HVAC installers are urged to be vigilant and routinely inspect copper elements, especially in units that may have discharged their gas. This proactive approach is crucial for identifying and addressing formicary corrosion promptly, safeguarding equipment longevity, and ensuring optimal system functionality.
Some practical steps in limiting the potential
for micro-pitting in pair coil include:
Some practical steps in limiting the potential
for micro-pitting in pair coil include:
1. Understand the environment in which the unit and pair coil are to be installed. This should influence the choice
of pair coil to be used. Environmental considerations are referred to in AS/NZS 5141:2018 Residential
heating and cooling systems — Minimum applications and requirements for energy efficiency, performance
and comfort criteria.
2. Ensure there are no u-bends or low-lying pipework where moisture can collect and pool.
3. Remove all flux, carbon and other contaminants from silver brazed joints.
4. Remove all oil from around flare connections, compression joints and copper tube.
5. Ensure no moisture enters or remains on the copper tube or insulation, including water and leak detection fluid.
6. Seal both ends and any joints/breaks in the insulation, especially around the flare connections to the indoor unit.