h. Electrical Controls (Figure 1-17).
(1) Main Control Panel. Almost all the electrical switching gear, electrical controls, and indicating lights you need
to operate the ROWPU are located on the main control panel(1). Flow meters(2) are also mounted in this panel. The
main circuit breaker (3) on this panel controls power to all circuits within the ROWPU. Relays and timers are used for
control logic. A warning horn sounds and yellow lights go on when operator attention is needed. An alert horn sounds
continuously and red lights goon when an automatic shutdown occurs. Blue indicator lights indicate open automatic
valves and green lights indicate operating pumps or operating mode.
(2) Switch Panel No. 1 (4). This panel contains distribution pump ON/OFF pushbuttons, a distribution pump ON
indicator light, a van interior light switch and a utility outlet.
(3) Switch Panel No. 2 (5). This contains the warning and alert horns, a van interior light switch, hypochlorite tank
mixer ON/OFF switch, vent fan switch, and a utility outlet.
Figure 1-17. Electrical Controls