Applies to the design, construction, installation, operation and inspection of refrigerating systems employing a fluid which is vaporized and is normally liquefied in its refrigerating cycle, when employed under the classifications or other areas listed in Section 3. The provisions of This code are not intended to apply to the use of: i) Water or air as a refrigerant; ii) Household refrigerators specified in AS 1430; iii) Small refrigerated air-conditioners specified in AS B210; iv) Water coolers and other small refrigerating equipment containing approximately 1 kg of regrigerant or less.