Fully open system pressure control valve (18).
Divert product hose (19) to waste.
Push BOOSTER PUMP START (20).
After flow is established, push HIGH PRESSURE PUMP START (21).
Water will flush from clean/flush tank through system by-passing the media filter until high
pressure pump and booster pump stop.
If tank is empty and pumps do not shut off, push HIGH PRESSURE PUMP STOP and
BOOSTER PUMP STOP. Operation can continue by manually starting and stopping pumps.
Notify Unit Maintenance. Troubleshoot the clean tank level switch (para. 3-3).
Bisulfite sanitizing cleaning.
Bisulfite sanitizing cleaning is required as part of shod term and long term shutdown to
secured status to prevent bacterial growth within the RO elements. Refer to para. 2-26.
This procedure leaves the RO vessels full of the sodium bisulfite sanitizing solution. Drain
only if the ROWPU will be subject to freezing (para. 2-31).
Hypochlorite Flush (Figure 2-53). When shutdown periods exceed 2 days, clean hypochlorite tank and pump as follows:
Failure to flush system will result in damage to equipment.
Control panel must be set up in FILTER NORMAL operation for following flush (para. 2-19 b thru d).
Open hypochlorite tank drain valve (1).
Wait until level drops below MIXER on tank level gage (2) and turn MIXER switch (3) to OFF.
Disconnect one dispensing hose (4) from distribution pump (5) and connect auxiliary fill hose (6).
Pass auxiliary hose (6) through doorway and connect water flush adaptor (7) to hose end.
Connect air/water utility "flush/purge" hose (8) to water flush adapter (7). Insert into hypochlorite tank quick-
disconnect and slowly open the "flush/purge" hose valve to prevent blowing the lines.
Push DISTRIBUTION PUMP OFF pushbutton and turn selector switch on pump to ON.
Push DISTRIBUTION PUMP ON (9) and flush out hypochlorite tank. Close drain and partially fill tank. Then push
DISTRIBUTION PUMP OFF (10).
Push CHEMICAL PUMP START (11). Note speed (12) and stroke (13) settings and reset speed to 80 and stroke to
Flush for two to five minutes. Remove flush/purge hose and reset pump speed and stroke controls to original
settings. Press CHEMICAL PUMP STOP (14). Open tank drain.
2-98 Change 12