Abstract: Presents the HVAC system and its control logic used in the Maintenance Hot Workshop.Commission the HVAC system,finds that the exhaust air flow rate in some rooms is insufficient,the temperature inside cannot meet the design requirement. Analyse the causes.According to the analysis, summarizes the factors which should mainly be considered when design,commissioning,operating, maintaining the system. Emphasize the importance of system commissioning on the normal operation of HVAC system in Maintenance Hot Workshop.

Key words: maintenance hot workshop, air conditioning and ventilation, commissioning