The issuance of revenue refunding bonds under the provisions of this article shall be authorized by resolution of the board of Governors and shall otherwise be subject to the limitations, conditions and provisions of section four of this article. Such revenue refunding bonds may be issued in an amount sufficient to pay (1) the principal of any outstanding bonds heretofore issued pursuant to the provisions of article eleven-a of this chapter or this article (hereinafter referred to as "outstanding bonds"); (2) the redemption premium, if any, on such outstanding bonds on the prior redemption thereof; (3) the interest due and payable on such outstanding bonds to and including the first date upon which said outstanding bonds are callable prior to maturity, not exceeding, however, ten years from the date of issuance of such revenue refunding bonds, or the dates upon which the principal of said outstanding bonds matures before such first date on which the same are callable prior to maturity, including any interest theretofore accrued and unpaid; and (4) all expenses of the issuance and sale of said revenue refunding bonds, including all necessary financial and legal expenses, and also including the creation of initial debt service reserve funds. Any moneys in the sinking or reserve funds or other funds for the outstanding bonds may be used for the purposes stated in (1), (2), (3) and (4) above or may be deposited in a sinking fund or reserve fund or other funds for the issue of bonds which have been issued wholly or in part for the purpose of such refunding. Such amount of the proceeds of the revenue refunding bonds as shall be sufficient for the payment of the principal, interest and redemption premiums, if any, on such outstanding bonds which will not be due and payable immediately shall be deposited in trust, for the sole purpose of making such payments, with the treasurer of the State of West Virginia. Any of the moneys so deposited in trust may, prior to the date on which such moneys will be needed for the payment of principal, interest and redemption premiums, if any, on such outstanding bonds, be invested and reinvested in direct obligations of the United States of America.