Autotrol Logix 740 Operation Manual page 27

Power
Variable Reserve Function
GENERAL 700 SERIES INSTRUCTIONS
700 Series controllers are available in two power configurations:
1. The North American model requires 60 Hz input. The controller will
display USA units when power is first applied.
2. The World model accepts either 60 or 50 Hz input and will
automatically adjust measurement units when power is first applied.
Information entered or calculated by the controller is stored in two
different ways.
A static memory will store:
Media volume
Regenerant setting
Time of regeneration
Days between regeneration
Filter mode
A dynamic memory with 8 hour retention will store:
Current day of week
Running clock
NOTE:
Water flow to the valve can be turned on or bypassed when the
controller is powered up for the first time.
The 700 Series metered-demand volumetric controllers (760 and 760C) are
designed to have a variable reserve feature. This feature automatically
adjusts the reserve to the end-user's water usage schedule.
A variable reserve saves salt and water by only regenerating when
absolutely necessary, and ensures enough soft water for typical
high-water usage days.
Each day of regeneration the controller reviews the last four weeks of
water usage for the same day of the week to determine if the remaining
capacity is adequate for the next day of the week. If the remaining
capacity is not adequate, it will initiate an automatic regeneration.
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Rev A