Fujitsu General Australia

1. Overview

This service notice relates to the DANT series outdoor units, which underwent a coil material and design upgrade from a specific serial number range onward. The update was implemented as part of Fujitsu General’s ongoing product improvement and reliability enhancement initiatives.

2. Background on DANT Copper Coils

Earlier DANT outdoor units were designed with standard copper heat exchanger coils, optimised for efficient thermal transfer but more susceptible to long-term corrosion in coastal or industrial environments.

To address field performance and longevity, Fujitsu General introduced an enhanced copper coil design, improving durability and reducing potential leakage issues associated with environmental exposure and vibration fatigue.

The new DANT coil design features:

• Upgraded copper tubing with improved wall thickness and refined metallurgy for greater corrosion resistance.

• Enhanced coil fin bonding for superior heat transfer efficiency.

• Revised coil support structure to minimise vibration-induced stress points.

• Improved brazing integrity to strengthen mechanical joints and prevent micro-fractures under cyclical loading.

This upgrade also aligns with the company’s environmental goals by improving refrigerant containment and reducing service-related emissions.

3. Serial Number Range (Coil Upgrade Implementation)

Coils were upgraded from the serial number range listed below.
From this point onward, all production units have been fitted with the new specification copper coil.

Note: Refer to your regional service bulletin or production database for the exact serial number cutoff for each capacity size.

4. Service & Compatibility Notes

• Replacement coils supplied after this update will be the new upgraded version regardless of unit manufacture date.

• The upgraded coil is fully backward compatible with earlier models.

• When replacing a pre-upgrade coil, confirm refrigerant charge and operating parameters as per the latest service manual specifications.

5. Identification

The upgraded DANT coils can be identified by:

• Revised part number labeling on the outdoor unit nameplate.

• Copper coil color (slightly darker hue due to material treatment).

• Updated manufacturing date code beyond the cutoff serial range.

6. Summary