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I would start by checking the flow rate of the chilled water pump and capacity of the district cooling system to see if they are higher than what the drawings specify. If both seem OK, and you're sure that the coils are defined correctly, then I would look at your sizing inputs for the cooling design day, which includes:

• Design Day Schedules (look for the phrase "SummerDesignDay" in your various schedules)
• Sizing:Zone objects for each zone connected to the AHU
• Sizing:Plant object for the plant loop connecting the district cooling to the cooling coil(s)
• Sizing:System object for the air loop connecting the central AHU to the zone terminal units