Principal function test governs tariff classification of multifunctional equipment; incidental heating cannot secure heat pump exemption.

For tariff classification under the Central Excise Tariff Act, a multifunctional product governed by the HSN must be classified by its principal function and market identity. The product's main role was producing chilled water, while the hot-water output was only incidental; its commercial identity was that of a vapour absorption chiller, not a heat pump. On that basis, it did not fall under Heading 84.18 and could not claim the exemption under Notification No. 155/86-CE. The classification under the refrigerating equipment entry was upheld.

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Issues: Whether the product manufactured by the appellant was classifiable as a heat pump under Heading 84.18 of the Schedule to the Central Excise Tariff Act, 1985 so as to avail the exemption under Notification No. 155/86-CE dated 01.03.1986.

Analysis: The tariff classification had to be guided by the Harmonised System of Nomenclature, since the Central Excise Tariff is structured on that basis. The HSN description of a heat pump contemplates a device that draws heat from a source and converts it, with supplementary energy, into a source of more intense heat. The product in question was found to have its primary function as producing chilled water, while the hot-water output was only incidental. Its commercial identity in the market was as a vapour absorption chiller and not as a heat pump. The additional components and heating capability did not alter its essential character, and the principal purpose test supported classification by its main cooling function.

Conclusion: The product was not a heat pump and was not entitled to the concessional exemption under Notification No. 155/86-CE.

Final Conclusion: The classification adopted by the Tribunal was upheld and the product was held to fall under the refrigerating equipment entry rather than the heat pump entry.

Ratio Decidendi: Where a tariff entry is governed by the HSN, classification of a multifunctional product must follow its principal function and market identity, and an incidental supplementary function cannot determine a more beneficial tariff classification.

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