PCG's are different than UNT's, depends how it was programmed.
If they selected Smoke Control Support in the Q&A it will put a force priority of 2. The point you need to toggle is EMERGENCY-MODE. It is an enum point which will do Normal (1) & Shutdown (5). The input will also do Purge, Pressurize & Depressurize if needed.
If they used the Unit Enable in the Q&A, it should shut it down but it only goes to the State Selection and does not put a priority force on the output.
They could of programmed the logic by scratch, then you have to manually connect the force level to what you want and release it to 16 when not needed.
If you uploaded the *.caf, email it to me and I will take a look for ya.