Automatic Regeneration

There are two ways to have the control automatically start a regeneration: calendar override or having the control monitor the water usage.

Calendar Override

This feature is set in Parameter P14. It can be set for one to 30 days. If it is set to zero, this feature is disabled. When this feature is active, the control keeps track of the number of days since the last regeneration and when that number equals the value set in P14, a regeneration is automatically started at the Time of Regeneration set in P2.

Control Monitors the Water Usage

The control compares the water usage to the calculated volume capacity of the system. The control uses the Capacity Parameter P5 divided by the Hardness Parameter P3 to calculate the volume capacity of the system. It also uses a reserve value to determine if a regeneration is necessary. If the water usage since the last regeneration is greater than the system capacity minus the reserve, a regeneration is needed.

Note: If the water usage exceeds 150% of the system capacity between regenerations, the control will automatically call for a second regeneration the next day even if no water is used. This feature is included to make sure that an exhausted resin bed is completely recharged.

Reserve Options

There are two types of reserve options for this control: fixed reserve and historical water usage pattern. They are selected with Parameter P15.

Fixed Reserve

When the fixed reserve is selected, the control multiplies the maximum system capacity by the percent value set in Parameter P16 and uses the result as a reserve.

Water Usage Pattern

The other reserve option allows the control to adjust the reserve based upon the historical water usage pattern of the system. The control keeps track of the water usage for each day of the week and uses that day’s average usage multiplied by 1.2 as the reserve for that day. Every day at the Time of Regeneration, the control recalculates the day’s average water usage. If less than 10% of a day’s average water usage is used, the control will not change the day’s average. If more than twice the day’s average is used, the control uses the actual usage in the reserve calculation.

Since a new installation has no history of water usage, the control multiplies the percent of capacity value set in Parameter P16 by the total system capacity to determine starting average for each day of the week. The factory set default value for P16 is 30 which means that 30% of the total system capacity is used for the starting average for each day.

Program Parameter P15 is also used to select whether the control waits until the Time of Regeneration set in Parameter P2 to start a regeneration, or if the control should begin a regeneration immediately when the capacity remaining is less than the reserve.