All department heads shall be appointed, promoted, demoted, suspended or removed by the Township Manager, except as otherwise provided by law or the Charter, in accordance with the Human Resource Policy and with approval of the Board. Prior to the demotion, suspension or removal of a department head, the Township Manager shall file written charges with the Board setting forth the reasons for the action. A copy of any written charges shall be supplied to the affected official. If requested within 10 days of the filing of charges, the charged official shall be entitled to a public hearing before the Board. Department heads shall be chosen solely on the basis of such executive, administrative and technical qualifications as are pertinent to the function, duties and operations of their respective departments and as are prescribed by law. For the purposes of interpreting the Charter, this chapter and the Human Resource Policy, the department heads are appointed officials.