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Learn How to Braze Line Set to HVACR Systems while Flowing Nitrogen! In this video, the lineset is connected at the indoor coil so the line set tubing circuit is complete and we can flow nitrogen from one side to the other side of the system. Remember to braze the filter drier in last to avoid contaminants entering the drier. Because I live near the ocean, we always braze the filter drier in near the evaporator inside the building to avoid it rusting and potentially becoming a leak spot later do