What is the purpose for a drainline for a regular HP to be made of copper vice PVC? I work for the gubernment, and many thing's do not make sence, but this one has me stumped. I ran the line as per drawings, and insulated it inside the warehouse space. I joked about it. The Public Works Engineer's told me if a drain line crosses a human occupied space, it must not be PVC. Well, words to that effect anyway. I say B.S. If it's fire they are worried about, melted PVC from a HVAC system is the least of their worries.
We have a computor room with 3 Liebert AC systems that have built in humidification. I can understand the copper drain lines for that, in case the humidification circuit fails and steam travels down the drain, but Resi grade Trane HP's?