Remove strainer and hose from water source.
d. Drain ROWPU pipes, filters, and connections:
(1) Open seven drain valves (para. 2-12b).
(2) 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
(1) 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. 239). After jogging the R.O. pump, some dripping from the drain is allowable.
(3) (Model 600-1) Disconnect product water lines from R.O. vessels so they can drain.
Reconnect lines when vessels are fully drained. (Model 600-3) Open front and rear sample valves all of the way
to allow R.O. vessels to drain. Close when fully drained.
(4) Tag and disconnect the lines on the multimedia filter control valve (fig. 2-1 4) and backwash
timer pilot valve, and allow lines to drain. After draining the lines, reconnect them to the valve as tagged.
Drain booster pump:
(1) Run BOOSTER PUMP (fig. 2-56) for no more than 5 seconds.
(2) Set switch to STOP.
(3) 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.
(1) Empty and rinse all chemical utility containers and fill them with brine water.