Toro Aqua-Clear ACS-218-12VDCL Important Safety Instructions Manual page 17

Powering the Controller
DC Model
The DC model requires four D Cell batteries,
which should power the controller for a year.
Install the batteries by removing the top of the
controller, and installing four D size batteries
as shown in Figure 13.
The unit has two levels of low battery
indication. When the battery voltage
drops to the first level, the low battery
sign will appear on the screen.
When the battery voltage drops further to the
second level, all outputs will shut down, and
the screen will be cleared leaving only the low
battery icon.
The DC model must always be used with
12v DC Latching solenoid valves.
AC Model
The AC model is connected by a transformer to an external power source. The AC model
must always be used with 24v AC solenoid valves.
Aqua-Clear Automatic Backwash (ENG/SPA)
Figure 13 Add batteries to top of Controller
pg. 17