There are no requirements for network standby for air conditioners. If there were such requirements they would be defined in Regulation (EU) 206/2012.
This is a subject that is being considered in the on-going review of this regulation.
Disclaimer: Please note that the European Commission cannot provide a legally binding interpretation of the EU legislation, as this is the sole competence of the European Court of Justice. Any remarks from the European Commission services are without prejudice to the position the Commission might take should related cases arise in a procedure before the Court of Justice.