Other Automatic Controls:Fan Center

Fan Center

A fan center is a primary controller designed to provide automatic low-voltage control of line voltage fan motors and auxiliary circuits in heating, cooling, and heating/cooling circuits. A typical wiring hookup with a two-speed fan motor, electronic air cleaner, and humidifier is illustrated in Figure 6-7.

In addition to providing the same switching functions as a fan relay (see previous section), a fan center includes an integral low-voltage transformer and a terminal board for low-voltage system wiring. In air-conditioning systems, a thermal delay relay is often added to a fan center to prevent short cycling of the compressor motor.

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