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3. Operation
prearrangment
selectors
illuminated
control
push-buttons
3.1 By-pass activation
The by-pass is activated by turning the key type switch located on the small box connected to
the microcomputer clockwise. When the by-pass is activated, all the electronic functions
(diagnostic, automatic washing, etc.) are disabled, and the unit works in manual mode (the
pumps 1 and 2 are activated acting directly on the PUMP1 and PUMP2 selectors). It is not
possible to perform fresh water washing with by-pass activated.
By-pass activation is signaled by the continuous green light of the start push-button.
The operation with the by-pass is necessary only in the following two circumstances:
Plant first start-up or plant restart after maintenance operations. The use of the bypass is
required at start up when purging air from the system. Without this in operation the computer
would sense that there was deviation from normal operation tolerances and would continually
shut the unit down.
Electronic failure
In the case of electronic control system failure, the by-pass allows use of the plant manually by
selecting pump 1 and pump 2 switches manually. It will however not allow fresh water flushing
of the unit as the Electro valve is controlled by the computer.
Do not engage the by-pass without good reason, as all diagnostic and automatic functions are
disabled when the by-pass is activated.
PUMP 1
AUT. WASHING
START STOP
MAN. WASHING
ALLA
