The Commission shall have power to enact such ordinances and to establish and enforce such regulations as it shall deem necessary to guard against the occurrence of fires in the city and to protect the property and persons of the inhabitants of the city against damage and accident resulting therefrom. For this purpose the Commission may establish, organize, and maintain, within the administrative division of the city, a fire department. Provided, however, that until otherwise provided by ordinance passed by a five-sevenths (5/7) vote of the Commission, the fire department of the city shall be and remain as now organized and the City Manager shall be limited in his appointment of the Fire Chief to nominations made by the members of the fire department.