Why does this line sweat ?
Walkin box - about 30' by 60' by 12'
Two evaps - hung at about 10' on one long wall.
Two condensing units outside at ground level.
The line sets are vertical and external to the walkin box.
Suction line is insulated - liquid line is not insulated.
One unit is running - the other unit is not running. The 'off' system is pumped down and has an isolation ball valve closed at the condensing unit.
95º day. The suction line sweats from the closed ball suction up towards the evaporator.
Why is that? What is happening to produce refrigerating effect in a dead-ended suction line?
Well; I am looking for clues <g>
This has been a long-term problem-child system. Losing compressors at a 10-1 ratio to the identical system next to it. Every kind of failure: seized, broken, no-pump, burnout, shorted. Pattern-less and apparently random failures. At start-up all conditions are textbook. Daily re-checks show the same consistent conditions of operation. Then a short while later the compressor fails.
I guess I will replace the liquid-line service valve - top of the receiver - and the LLSV this time around. As, so far as I can see; they both must leak through.
Originally Posted by icemeister