I have a weather king ac unit 2 ton. The model # says SFC924C-1B on the back. Today I was sitting outside and I heard a relay clicking sound every few minutes from the unit. The ac unit was cooling my house fine, I don't smell any burning or whatnot. It just kept making this clicking sound... Is this normal or is there some sort of problem here?

How old is this ac unit? I cant find ANY info on it online...

Thanks for any help you can give folks!