Disclosed is a method and system for converting or retrofitting manually-operated flush valves. The peeling process station has a peeling device that peels the stacked substrates, a first washing apparatus that washes peeled substrates to be processed, and a second washing apparatus that washes the peeled support substrates. The skeleton supports an HVAC assembly. Therefore, through providing the plural boards and the plural connection members in the closed tank unit to construct the water reservoir, the reservoir can be provided with an effect of isolating temperature, a power source, ambient moisture and water.