Remove strainer and hose from water source.
Drain ROWPU pipes, filters, and connections:
Open seven drain valves (para. 2-12b).
Open five vent valves (para. 2-23b).
Drain R.O. pump as described below:
To prevent damage to R.O. pump, do not operate R.O. PUMP JOG
switch (42, fig. 2-4) more than 5 seconds at a time.
The JOG switch can be used when the R.O. Pump LOW PRESSURE
lamp is on.
After water stops flowing out of drains, set R.O. PUMP JOG switch (42, fig. 2-4) to JOG. Hold it there
for 3 to 5 seconds to force water from pump.
(2) Repeat operation of R.O. pump with JOG switch until no more water comes from the DRAIN PULSE
DAMPENER drain (fig. 2-41). After jogging the R.O. pump, some dripping from the drain is allowable.
Open front and rear sample valves all of the way to allow R.O. vessels to drain. Close when fully
Tag and disconnect the lines on the multimedia filter control valve (fig. 2-15) and backwash timer pilot
valve, and allow lines to drain. After draining the lines, reconnect them to the valve as tagged.
Drain booster pump:
Run BOOSTER PUMP (fig. 2-57) for no more than 5 seconds.
Set switch to STOP.
Repeat the last two steps until no more water comes from cartridge filter drain (fig. 2-9).
Drain chemical feed pumps as described below:
Chemicals used for operating ROWPU can kill you. The chemicals alone
or in mixture can be dangerous. Always wear protective clothing and
make sure area is well ventilated.
Empty and rinse all chemical utility containers and fill them with brine water.
Set chemical pump valves to PRIME (fig. 2-66).