bids are invited for operation and maintenance of hvac system (heating, ventilation and air conditioning system) - repair of 2 no of 140 tr capacity air cooled central air-conditioning plant and its associated equipment to make the hvac plant functional before the start .. , operation and maintenance of hvac system (heating, ventilation and air conditioning system) - repair of water pipeline and chiller pipe line outside the building area and supply of water tank (1000 litres) used for supply water of ac plant of old bui.. , operation and maintenance of hvac system (heating, ventilation and air conditioning system) - complete system