how to input in IDF in order to run Two air conditioning unit in one zone simultaneously?

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I model one zone with two window type air conditioning unit. In the equipment connection list there is sequence or simulation order of the two aircon. Now the problem is that the two aircon units runs simultaneously during its operation. I want to know on how to input this two aircon units so that during the simulation it will run simultaneously not in sequence. Thank You. Your help is much appreciated.