While Air Turbine Works Damper 3 (Bypass valve) to work (on - off) with the size of the pressure inside the pipe, the heat that is, if the pressure in the pipe line, hot air is less than the value set is ordered Damper 3 (. by pass valve) closed if the pressure in the pipe over a certain value, it ordered Damper 3 (by pass valve) opened by controlling the voltage across pressure Transmitter (PT 0).
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