Our fire service(im not in the US) is done in 2 parts generally which may be like what you have. You have a fire service recall switch on the main entry lobby landing panel. This switch cancels all car calls, activates the main lobby car call on the cars and sends them back down. It then parks the cars with the doors open ready for the fireman to use. They would then have to turn on the fire car(not normally more than 1 lift) to on. You then turn it to start to close the doors after you push a floor. It also puts the lift on attendant control and will only allow 1 floor at a time to go on. When you get to a floor you have to push the door open button to open the doors but if the doors aren't more than half way open, it will auto close if you take your finger off the button. So check your button circuits for what appears like a recall system.
