Hey I've got a question about a hussman rack issue I saw Friday.
We found an empty receiver, and The LL from the roof was freezing cold. Tech said all the refrig is on the roof. He shut the A8 (?) valve and reciever level went to 20% (with heat reclaim operating).
What is the purpose of this? The valve bypasses the condenser and puts hot has right in the receiver. In this case it was wide open and over pressurizing the receiver while under pressurizing the line to the condenser, so gas wants to sit on the cold roof.....at least thats my interpretation.
I'm just not familiar with the scenerio where the receiver needs hot gas....I can assume this is to keep LL pressures up, but then we can cycle fans on the roof for that. Plus, the system has a subcooler on the liquid line, so why would we run a subcooler AND dump hot gas on some demand?
Thanks guys, for any help you can give me. I realize this is a somewhat elementary question, but it seems to make perfect sense until your actually standing there with a wrench in your hand, ya know?