I have a similar issue when trying to hard code the capacity [W] of the cooling coils. I’ve been looking into the SizingSystem of the Airloop, trying to put a cap on the CoolingDesignCapacity. However this is not respected by either cooling coils in the supply Air Loop or by cooling coils as equipment in thermal Zones.
Alternatively you can use a single speed cooling coil and cap the RatedTotalCoolingCapacity. However this is not the perfect solution as the capacity is based on fixed rated conditions. See my post on the topic here:Cooling Coil Total Cooling Rate ≠ Gross Rated Total Cooling Capacity.