The department of public safety shall be under the supervision of a director who shall be appointed by the mayor. The director shall have charge of the police, fire, health, charities, corrections, and building inspection of the municipal corporation. All powers and authority over such police, fire, health, charities, corrections, and building inspection are vested in the director. The director shall have charge of the administration of all infirmaries, and all charitable, correctional, and penal institutions. He shall make such rules as are necessary and proper, consistent with the minimum standards for jails in Ohio promulgated by the department of rehabilitation and correction, for the employment, discipline, instructions, education, reformation, and for the conditional release and return of all prisoners confined in any penal institution under his control.