Hvac application

I’m trying to connect this remote to a thermostat in a building which has 10 condensing unit outside so my goal is to set this up at the thermostat activate the remote and listen for the contactor that is pulling in on the outside units any wiring help would be appreciated tried powering from the 24 V present at the thermostat but there’s just one red wire and no common and then the yellow
Wire which controls the contactor on the outside unit any help would be appreciated

Maybe can you provide the datasheet of your thermstat? so I can see if I can find the 24V power lines.

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