A.O. Smith PEARL ULTRA User Manual page 24

• Regen. Mode
Four Regeneration modes can be selected to meet different installation
environment:
Calendar Clock: The unit will initiate regeneration at the next pre-set
regeneration time based on the interval of days between regeneration
days.
Meter Immediate: The unit will initiate regeneration immediately after
the volume remaining reaches zero.
Meter Delayed: This is the most common setting. When the volume
remaining reaches zero, the system will initiate regeneration
at the next preset regeneration time.
Meter Override: When the volume remaining reaches zero, the system will
initiate regeneration at the next pre-set regeneration time. If the days
between regeneration are reached before the volume remaining reaches
zero, the system will override the meter setting and initiate regeneration.
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• Regen. Time
This setting controls the time of day when regeneration will start.
• Regen. Days
This value is the interval (days) between regenerations. It is used to
determine how many days between regenerations.