I just took over some ownership and maintenance duties on this temple in Atlanta. In one of the buildings there is 9 package rooftop units. They are all Trane units. They all seem to be these YSC060A3 style (some are the 48 model ones, smaller ones). Full model number is YSC060A3RMA2T01B. Each one of these units are directly connected to a single Trane Zone Sensor BAYSENS019C, so no multiple zone sensors connected to one unit. Now these zone sensors work fine, but we would like to change them all out to more user friendly ones, mainly also we want more control over them by using the Wifi based ones.
Now when I took off the BAYSENS019C I noticed clearly this is not your normal thermostat wiring, it has the 7, 8, 9, 10, 11, 12, 14 labelled wires. Im like this is not a normal thermostat. After looking at manual noticed these dont operate like normal thermostats on those wires either, it uses mainly serial communication back to the control unit.
So then I went to the roof and popped the control access panel off one of the rooftop units. Noticed the control board has those 7 through 14 wires connected, but also has the right side of the board where it has your standard pins like R, W, Y, G for a standard thermostat. But its unused. Here is a picture of that control board.
Could I just say remove all the wires from 7-14 on the control board, and repurpose them on the right side of the control board to allow me to use a standard residential style thermostat (we are interested in installing the Filtrete 3M50s)? It seems straight forward to me, but wanted to check with some experts before attempting this.