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line-set sizing etc

Bob C._2
Bob C._2 Member Posts: 33
air handler located 25' above condenser total line set length is 75'

do i need to trap-if so where-also do i need to upsize line set


  • Techman
    Techman Member Posts: 2,144

    The cond unit comes w/ an installation manual, check it out. Most units will work properly w/ a 25'vertical rise, and 75' length. The pipe size increases in size as the length increases.There is a pipe sizing chart in the manual,based on rise vs length vs tonnage. There are no traps required when the evap is above the cond unit, traps are required when the cond is above the evap. But, there is a requirement for a riser at the AHU , its an anti-syphon loop.