Undersizing the suction line should only be done as a velocity riser if the compressor is above the evaporator to assist in oil return, and only the riser is undersized. A system with an undersized suction line will probably seem like it's working ok but really not. Suction pressure will be low due to the line's lack of ability to carry enough refrigerant back to the compressor. Low suction results in colder evap temps and a cool but clamy house, not to mention the higher potential of ice-ups.Originally posted by ikey
I was told that a smaller suction will not affect efficiency, only capacity. Also had a major co. down here that was a Lennox new construction and almost lost their dealership because of installing 1/2 in liquid lines in many homes. Killed many compressors. I haven't seen a pub yet that recommends 1/2 liquid on anything less than 5 tons.Originally posted by smokin68
If you don't install what is spec'ed, you won't get the spec'd seer,14 in this case. Use the proper size.