The municipal water supply pressure of a hotel with a building height of 80m is 0. 12MPa. Which of the following descriptions about the water supply system is incorrect? ( )

According to Article 6. 1. 12 of Design Standard for Water Saving in Civil Buildings (GB 50555-20 10), the setting of pressure reducing valve should meet the following requirements: ① It is not suitable to use * * water supply risers to reduce pressure in series and supply water in different regions; (2) When the hot water system is partitioned by a pressure reducing valve, the setting of the pressure reducing valve should not affect the operation effect of the circulation system; (3) The water distribution branch pipe with water pressure greater than 0.2MPa at the water point should be provided with a pressure reducing valve, but it should meet the requirements of the minimum working pressure of water supply fittings; (4) the setting of pressure reducing valve should also comply with the current national standard Code for Design of Water Supply and Drainage in Buildings (GB 500 15).