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"One system we specify was a contractor suggestion. The "old way" was board insulation and so-forth, pretty common but with a covering of roof membrane to match the roof material. That worked great except it was not a sanctioned application…"
"That is why I like VRF systems, David. We agree especially in the humid south and of course with cycling in general of on-off single-capacity systems.
Inverter drives are the current ideal and I use them whenever I can on larger systems (which…"
"Got it and understood thank you. I was figuring if there was a problem, the water was not leaving the unit.
That amount of moisture though is negligible though, at least in large, high-latent air handling units.
For example, a 10,000 cfm 100% OA air…"
"All cooling coils which remove moisture (which is most of them!) require a drain pan below them to capture this. So much is known and ideally this would be either stainless steel or an approved thermoplastic or ABS for corrosion protection. The…"
"This has been a topic of discussion for 20 years now. It is true that appliance manufacturers often sanction PVC (solid, not cellular core as Charles Buell noted), as venting material. This keeps cost down and market share up and there are thousands…"