After receiving 30 weeks of sickness pension payments under Sections 683, these payments
                  may convert to total permanent disability pension payments under Section 686, as follows:
               
               After the Section 683 payments expire, the worker is given an additional 30 weeks
                  timeframe (but no further payments) to prove they are totally and permanently disabled
                  based on the same injury/illness.
               
               If the worker is determined to be totally and permanently disabled within this timeframe,
                  the previously paid Section 683 benefits are then considered an “advance” of Section
                  686 payments.
               
               The Section 686 single lump sum payment is reduced by the amount of the Section 683
                  payment previously made. Any Section 683 payment deducted from the Section 686 payment
                  is deemed to be converted to payment under Section 686 and, therefore, does not cause
                  offset.