MECHANICAL SPECIFICATION

Corrosion Protection Coating – VRF Condensers

Thermal‑XR® Energy‑Saving, Hydrophobic Corrosion Coating System

1. GENERAL

Provide and apply a factory‑approved corrosion protection and thermal‑conductive coating system to VRF outdoor condenser units.

The intent of this specification is to enhance resistance to atmospheric corrosion, improve or restore heat‑transfer efficiency, and provide a hydrophobic surface to reduce moisture retention and fouling.

This specification applies to all externally located VRF condenser coils, fins and exposed metallic casing surfaces subject to outdoor environmental exposure.

All works shall be carried out in accordance with the coating manufacturer’s written instructions and recognised HVAC/R industry best practice.

2. PERFORMANCE REQUIREMENTS

The coating system shall be suitable for use in corrosive outdoor environments including coastal, marine, industrial and high‑humidity locations.

The applied coating shall not materially reduce condenser airflow, fin spacing or heat rejection capacity.

The system shall provide hydrophobic properties to promote water shedding, reduce salt deposition and minimise moisture dwell time on coil surfaces.

The coating shall assist in maintaining or improving thermal efficiency of the condenser coil by restoring degraded heat‑transfer surfaces.

The coating system shall be chemically stable, UV resistant and compatible with aluminium fins and copper tubing.

3. PRODUCT

Approved Product: Thermal‑XR® Restore & Protect System as supplied by Graphene Manufacturing Group, or approved equivalent.

The coating system shall comprise a coil preparation/cleaning stage, a thermally conductive restore coating, and a hydrophobic protective topcoat.

The coating shall be a thin‑film system incorporating thermally conductive ceramic and graphene‑enhanced materials designed for HVAC/R heat‑exchange applications.

4. APPLICATION

Prior to coating application, condenser coils shall be cleaned of dirt, oils, oxidation and contaminants using manufacturer‑approved cleaning agents.

Surface preparation shall not damage fins or tubing and shall include fin straightening where practicable.

The coating shall be applied using low‑pressure spray equipment to ensure penetration between fins without bridging or blocking airflow.

Coating shall be applied evenly to achieve the manufacturer’s recommended coverage rate and film thickness.

Internal refrigerant circuits, fan motors, fan blades, electrical enclosures, controls, nameplates and service labels shall not be coated.

5. TESTING, WARRANTY AND DOCUMENTATION

Provide documentation confirming product type, batch numbers, application method and coverage rates.

Provide photographic records demonstrating pre‑application condition and completed works.

Provide a minimum manufacturer’s performance warranty of three (3) years covering coating adhesion and corrosion protection when installed and maintained in accordance with manufacturer requirements.

Provide maintenance and inspection recommendations to be included in the building services maintenance manual.