I have an older Varitrac on a job that I looked at yesterday. I have to do on/off through a time clock also this is a building in a plant and the customer wants an emergency shutdown. In looking through the manual I see that there is 3 ways to do this but the easiest looks to be shorting the supply air temp sensor(unit is a split not a Voyager package). Anyone done this before? Any preference? Any help would be appreciated.