The fleck control valve has two basic sets of components, the wetted surface components and the electrical logic that moves those wetted components. All of the electrical side is mounted on a plate which is bolted to the brass valve body. This plate with all of its motors and gears is called the power head. In the case of the 2900 valve you have an upper and lower power head each operating its own piston. For years the power heads were hard wired for a specific configuration, stand-alone unit, twin alternating, sequential regeneration etc. These hard wired configurations are still available but advances in product development have introduced the digital control. The newest is the NXT which contains all configurations in one timer. The setup is menu driven on how you want the valve to operate. The NXT can link as many as 4 tanks together coordinated operation. A power head change can give you the newest features on the market. The picture shows the 2900 digital NXT upper and lower power heads less covers, notice how void of wiring it is.
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