Aircon installation on private lot, and relevant by-laws.

We have a super interesting, and confusing strata plan whereby “the whole of the structure of the building within each lot forms part of that lot and is not common property”. We are hoping to get some air-conditioning upstairs. The condenser unit will be in the courtyard (which forms part of the lot and is not common property). Many others in the complex have air con set up in this way, and therefore what we are doing is, from a aesthetic perspective, “in keeping with the rest of the building”. Our strata manager has advised we need a meeting of the owners corporation to approve this, so we will probably get our air-con just as winter is again approaching. We cant seem to get an answer as to which by laws/part of the act determines that this indeed needs OC approval? Does anyone have any insights?