A new ventilation system was designed that allows to cool by just circulating the cooling water and by-pass the cooling units in case the outside temperature is sufficiently low, and/or there is no external power and we can not run the big cooling units. The system design was modified to be able to regulate the temperature of the cooling water that goes to the telescope, which has to be relatively warm, while keeping the cooling water that goes to the FIES building as low as possible.

Thomas Augusteijn 2013-12-02