This what I have, Mcquay RTU with preheat and heating coil for MA, there is a return so it's not 100% An exhaust fan over the cooking island, and one for the dishwasher in this zone. A front line with its exhaust fan, the McQuay RTU serves the dining area, cashier, and front line which is cafeteria style, in this zone. This RTU has preheat coil, cooling coil, and reheat coil, Both unit Coils are heating water and cooling glycol. If the freeze stat. or smoke detector trip in either RTU, whole system is shut down. What is the proper sequence operation for this set up, should there be an interlock so if the EF isn't running the RTU(s) shouldn't run? There appears to be two separate zones even though they prop doors open. I don't have to worry about balancing the system, as I put a stop/disclaimer in doing the work without rebalancing being done after, to CMA. Also there is a hood washing system that doesn't work. Ansul systems that do work.