WP440L-Series Reverse Osmosis System
Installation Instructions and User Manual
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Membrane Flush
If the Flush Type Set-point is programmed to 0, flush is disabled. If membrane flush is desired, several types of flush are
available. When the unit enters a flush cycle, the flush relay will activate. The flush cycle will last for the time programmed
in the Flush Time Set-point. Table 3 shows the value that must be programmed in the Flush Type Set-point for each type
of flush.
Table 5 - Flush Type Description
FLUSH TYPE
DESCRIPTION
0
NO FLUSH
1
TANK FULL
2
OPERATING HOURS
3
OPERATING HOURS AND TANK FULL
4
ELAPSED TIME
5
ELAPSED TIME AND TANK FULL
6
OFF HOURS
7
OFF HOURS AND TANK FULL
8
RO START/STOP
TANK FULL - The RO unit will flush each time a tank full condition occurs.
OPERATING HOURS - A flush will occur when the RO pump has operated for the number of hours programmed in the
Flush Interval Set-point.
ELAPSED TIME - A flush will occur after the number of hours programmed in the Flush Interval Set-point has passed.
OFF HOURS - A flush will occur when the RO has been shut down due to a tank full condition for the number of hours
programmed in the Flush Interval Set-point.
RO START/STOP - A flush will occur each time the RO starts or stops.
The tank full flush can be combined with any of the 3 interval flush types. A manual flush can be initiated by pressing the
Alarm Silence/Reset key for 3 seconds.
The Flush Mode Set-point can be used to control the operation of the inlet valve and RO pump during flush. Each can be
independently programmed to operate during flush. Table 4 shows the values to program into the Flush Mode Set-point to
control the operation of the inlet and RO outputs during flush.
Table 6 - RO Pump and Inlet Valve Values
FLUSH MODE
RO PUMP
INLET VALVE
0
OFF
CLOSED
1
OFF
OPEN
2
ON
CLOSED
3
ON
OPEN
If the TDS / Conductivity reading exceeds the limit programmed the TDS / Cond Limit Set-point for the delay programmed
in the TDS / Cond Delay Set-point, the alarm lamp will light and the HI TDS / Cond warning message will show on the
display. This warning will clear when the TDS / Conductivity drops below the Set-point.
If the TDS / Cond Shtdwn Set-point is programmed to 0, the unit will continue to operate. Otherwise, once a high TDS /
Cond warning occurs, after the time programmed in this set-point, the RO unit will shut down and the alarm will sound. The
alarm can be cleared by pressing the Alarm Silence/Reset key twice.
If the current hours exceed the limit programmed in the Maximum Hours Set-point, the alarm lamp will light and the OP
HOURS EXCEEDED warning message will be shown. This warning can be cleared by programming the current hours to 0
or by increasing the maximum hours limit.
Flush Mode
High TDS / Conductivity Warning/Alarm
Operating Hours Exceeded
