The master actuator unit(s) is the brain of the HVAC system. It fulfills all of the functions of a slave actuator unit and includes other capabilities, such as:
From a system perspective, the master and slave actuator can have the same hardware and software. In this case, the master is a role rather than a certain device and it would not represent a single-point-of-failure, as another slave actuator could take over the master role in case the original master fails. However, there must be only one master, per system, at a time.
*Note: For the power supply, usually the mains will be needed for the fan/HVAC (e.g., 230Vac or 110Vac, or 24Vdc from the building control system).
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