Conn. Gen. Stat. § 5-158h

(b) If a member covered under part B elects to transfer to full part A prior to such date, the member shall notify the Retirement Commission no later than the first of the month following three months after June 28, 1985, on the form provided by it and shall pay in a lump sum the extra contributions that would have been payable, without interest, had such part A election been made as of his date of entry into the system. If such employee is financially unable to make such lump sum payment, the employee and the Retirement Commission may enter into a contract for payment of such amount in not more than one hundred thirty-one equal biweekly installments. Such installments shall include interest at five per cent a year, and the transfer to part A shall not be effective until all such installments have been paid. If a member severs employment for any reason before all such installments are paid, the balance outstanding shall be payable in a lump sum within ninety days or a longer period if approved by the Retirement Commission. If such amount is not paid, the member shall be entitled to the refund of prior installments, but without any additional interest.

(c) If a member covered under full part A provisions elects to transfer to part B prior to such date, the member shall notify the Retirement Commission no later than the first of the month following three months after June 28, 1985, on the form provided by it. Such member shall receive as a refund from the retirement fund, the contributions that had been paid by him, including any interest paid by such member, but excluding any other interest adjustment, beyond those that would have been payable had such part B election been made as of his date of entry into the system or January 1, 1956, whichever is later.

(d) If a member does not wish to change his coverage, no action on his part shall be required.

See Sec. 5-158e re transfers from part A to part B.