| 摘要 |
In one form of the present invention, the operation of reducing hard water to soft is controlled via integrated circuits and software. In combination as a computer control unit, the integrated circuits and software control a valve that supports the cycles used in softening water. The invention reduces the complexity of the setup and operation of a water softener using four simple keys in conjunction with the computer control unit. In addition to these four simple keys, a hidden key is also provided for internal use in manufacturing and servicing operations. The hidden key may have no graphic or identity on the interface panel of the computer control unit, or it may have some graphic not indicative of a key. When depressed along with other keys, this hidden key offers a way to access special operations such as data input and output.
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