Today we assembled the air handler to the return and supply air plenums and got the unit in proper position. We then attached the main return air to the return air plenum and I also started assembling one of the two return air ducts. We got our line set in place and brazed the lines on the condensing unit and the evaporator coil. We then finished the day by inserting the filter and doing a leak check on all the nut fastening points.