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Subject: ddc controller electr.eng. DANBURY CT-Imagine you have a small ddc controller assigned to control a fan system that has three analog and three binary outputs. One analog output is for a chilled water valve actuator and another for a hot water valve actuator. The third analog output is for outside air, return air and mixed air damper actuators in the economizer. Two of the binary outputs are for supply fan and return fan start and stop. That leaves you with one binary output left, and you wanted to add a modulating actuator on a minimum outside air damper to the system.
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