Flipkart AC installation by 3rd party

Guy just bought hitachi 1.5t 5star from Flipkart . On it im getting installation which is charged 1500rs my question is are those guys from hitachi who are going to install my ac or third party service providers authorized by fk.. ive read many reviews abt their bad installation.. so should i get my ac installed by technician other than jeeves or koryo.. like local acwala.. will my warranty void if i do so..