@guiones I have the LPC FCOM so I can switch between FCOMs for different aircraft, my company has both new and old MSN A320s, so I can view aircraft specific FCOM, but I still couldn't find an answer for my question even in the Old MSN FCOM, that why I asked
@Imperial Shifter: So you're saying that yes the Zone controller does have control over the Hot Air Valve/Trim Air Pressure Regulating Valve?
In that Case the Zone Controller does the same job as the ACS with regards that specific Valve?
The reason I ask is because there are two detailed schematics in the FCOM, one for the new ACS system and one for the old PACK/Zone Controller System. In the New system schematic there is a line connecting the Hot Air Valve to ACS 1, indicating direct control of that valve by the computer.
In the old system schematic there is no line between the Hot Air/Trim Air Pressure Regulating Valve and any computer. There are lines connecting the Trim Air valves to the Zone controller, but nothing connects to the Trim Air Pressure Regulating valve. Is the schematic incomplete?