Arrived onsite customer has had their hvac system leak water from attic into the second floor. Issues present, drain pan under indoor unit is very small and is only underneath the ac coil. Issue number two no wet switch is present in drain pan, this would cut off power to the unit if water entered the drain pan. Issue number three current secondary drain pan is tied into the primary drain pan if primary drain backed up, secondary drain would back up as well. Issue four, current drain line has no strapping and is back graded shortly after leaving the unit. Recommend installing a larger drain pan 5ft by 36 inches in size, recommend adding two p traps one for each drain line. Recommend replacing section of primary drain line that is back graded. Recommend running a completely separate secondary drain line, securing primary and secondary drain line every 4 feet confirming that the drains have proper grade ( currently no strapping is present). Secondary drain line would run out of the atti