You will require this licence if you intend to import equipment that contains ozone depleting substances or synthetic greenhouse gasses into Australia. For example, refrigeration or air-conditioning equipment that contains a hydrofluorocarbon (HFC) or hydrochloroflurocarbon (HCFC) refrigerant.
This licence is also required if the air-conditioning or refrigeration system is incorporated into another object such as a car, boat, yacht, caravan, earth moving equipment, vending or ice-making machine, ice cream maker, air-conditioner, refrigerator, water cooler, etc.
This licence is not required if you are importing no more than 5 pieces of equipment containing less than 10 kg in total in a single consignment.