All the expenditures required for the support and maintenance of inmates and the repairs and improvement of the county correctional institution shall be paid from the county treasury by warrants drawn, in the mode prescribed by law, on the regular appropriation for the purpose. No warrant shall be certified by the controller for any expense connected with the county correctional institution unless on vouchers approved by a majority of the board and endorsed by the president and secretary of the board, and all contracts involving an expenditure of funds from the county treasury shall be made in accordance with the procedures set forth in Article XVIII of the act of August 9, 1955 (P.L.323, No.130), known as The County Code.