Question: How is the PCS3 wired to the GL235 solar controller?

The PCS3 hot side is wired to terminal #6 of the GL235 counting from the left. This is the hot side of the attic switched outlet that the PCS3 plugs into. The neutral and ground go directly to the switched outlet inside of the attic. The hot side of the 115 vac power must then be wired to terminal #5 of the GL235. In this way the solar controller turns the attic unit on and off automatically. See the wiring diagrams in the PCS3 installation manual for further details. It is found under the technical manual.