A. Introduction
5. Function of Components/Controls
On/Off Power Switch
This switch, located on the rear side of the unit, controls
the power to the control box. The power inlet socket is
located below the ON/OFF switch. This socket has a built
in fuse holder which contains the main fuse plus a spare.
Pump
This magnetic drive gear pump provides a draw-off flow rate of
1.5
1/min.
A built-in pressure relief valve regulates discharge
pressure to 2.8 bars (40 psi).
Sensor
The sensor, located at the outlet of the purification pack, is
electrically connected to the PC board. The sensor continuously
measures the resistivity of the product water as it exits the pack.
Meg-0-Meter Display
Resistivity of the water is displayed on the alphanumeric display
as product , Megohm x cm.
The unit is internally temperature-compensated to normalize readings
to 25° C.
Three Way Point-of-Use Valve
This PVDF valve, located behind the front panel of the unit, is
manually operated by the knob on the front panel of the unit.
This valve has two positions: RECIRCULATION - where the water
is directed through the system's recirculation loop; or
PRODUCTION - where the water is directed through the final
filter to the point-of-use.
CONTROL KEYBOARD
Operate/Standby, Operate Mode
This button, when first depressed, will switch the system to
the operate, mode. During operate mode the inlet solenoid valve
is open and the pump is running. If the manual point-of-use
valve is in the RECIRCULATION position, water will recirculate
around the system's internal recirculation loop. If the
point-of-use valve is open in the PRODUCTION position, water
will be delivered through the point-of-use. During operate,
the display will show the resistivity of the purified water
as product , Megohm x cm.
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