mstrlucky74
Senior Member
- Location
- NJ
Global RTU shut down can be accomplished via BMS, single addressable relay adjacent to the BMS cabinet. I abhor the idea, due to hvac be able to cut a single unsupervised wire or remotely overriding the input, but is cheaper and does simplify wiring and coordination.
I like to tie security in to lighting. Being able to light an entire facility instantly upon alarm is an effective tool.
Global RTU shutdown can also be achieved by daisy-chaining the duct smoke detectors. I recall an install sheet from System Sensor that allowed you to hook together 10 or 50 units, depending on the model. Crazy, but I suppose a big-box store might have that many.
Global RTU shut down can be accomplished via BMS, single addressable relay adjacent to the BMS cabinet. I abhor the idea, due to hvac be able to cut a single unsupervised wire or remotely overriding the input, but is cheaper and does simplify wiring and coordination.
I only allow this to happen if the BMS is also UL listed as a smoke control system equipment. If not, the UL listed fire alarm control must do the shut down of the fans. Supplemental notification to the BMS is a good idea, since it allows the BMS guys to change to an alternate sequence if it is a critical system for plant operations.