Table 2-1. Water Processing Controls and Indicators
Control or Indicator
Control Box Assembly
Indicator lamps; switches to start, operate and stop
(including EMERGENCY STOP) all pumps. (See fig. 2-4 sh 2
keys 24 through 43).
Provides light for inside of the ROWPU and for the control
panel. It is mounted on a movable bracket that can be pulled
forward to provide more light on the control panel.
Vent Cartridge Filter Valve
Relieves air from cartridge filter.
Vent Pulse Dampener Valve
Relieves air from pulse dampener.
Vent Multimedia Filter Valve
Relieves air from multimedia filter.
Backwash valve has two positions: NORMAL and BACK-
WASH. In NORMAL, the valve closes the backwash inlet and
allows raw water to flow through the ROWPU. In
BACKWASH, the raw water inlet is closed and water is
allowed to flow through the backwash inlet. After back-
washing, the valve should be returned to the NORMAL
Multimedia Filter Gage
Indicates differential pressure across the multimedia filter.
Connection for dirty brine used to backwash the multimedia
R.O. Vessels Gage
Indicates differential pressure across the R.O. vessels.
Raw Water Flow
Measures in gallons per minute the amount of water drawn
in by raw water pumps and fed into ROWPU.
Connection for backwash hose.
Connection for hose from raw water pumps.
Used to ground ROWPU. Protects personnel from electrical
Backwash Water Flow Gage
Measures amount of water flowing through multimedia filter
during backwash cycle.
R.O. Pressure P.S.I. Gage
Shows discharge pressure of the R.O. pump in pounds per
square inch (psi). Gage reading depends on setting of
REGULATE PRODUCT FLOW valve.
Brine Flow meter
Measures amount of brine flow from the ROWPU in gallons
Regulate Product Flow Valve
Closes the outlet of the R.O. vessels. Controls the rate of
flow of the product water. Regulates output pressure of the