Section 6 – User Settings
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6.3 Control
Setup
6.3.1 Control ON and OFF Times
The Control ON and OFF times are set when the Pool Size is entered. (section 2.6).
The ON time is the maximum amount of time the pump will operate continuously. For example, if
the ORP ON time is set to 6 minutes, the ORP pump will add Chlorine for a maximum of 6 minutes
and then wait for the OFF time. Of course, if the ORP gets back within the limit earlier, the pump
will stop before the end of the 6 minutes.
The OFF time is the waiting time between ON cycles. Even if the ORP or pH go outside their
normal limits during the OFF time, the
easyCHEM 770
will not activate the relevant pump until the
entire OFF time has elapsed.
The ON and OFF cycles for ORP and pH run sequentially. This allows time for mixing for each of
the chemicals, and avoids the problem of the Chlorine affecting the pH reading or the Acid
affecting the ORP reading. If no chemical has been added for the entire ON Time for either
reading, the
easyCHEM 770
skips the following OFF Time and goes straight to the ON Time for
the other reading. This is because mixing time is not required when no chemical has been added.
The diagram below illustrates the ORP and pH control cycle.
For example, if the ON times are both set to 5 minutes and the OFF times are set to 10 minutes.,
the unit will dose for a maximum of 5 minutes, then wait for 10 minutes. These ON and OFF times
cycle repetitively. At all times, the ORP and pH pumps will only operate when the readings are
outside the limits.
Correct use of an ON and OFF cycle will avoid overdosing problems.
