TM 10-4610-232-12
WARNING
Water over 1000 ppm TDS is not safe to drink.
(7)
Conduct routine RO element cleaning procedure (para. 2-25) as shown in Table 2-26 or 2-27. Use the high pressure
pump hourmeter (55, Figure 2-4) to monitor hours.
(8)
Complete Data Log. Refer to Appendix H.
c.
Alarm Shutdowns (Figure 2-58), The alert horn will sound and ROWPU will automatically shut down for the reasons listed
below. Push ALARM SILENCE (1) and refer to troubleshooting chart (Table 3-1) to locate and remedy cause for shutdown.
Figure 2-58. Alarm Shutdowns
(1)
Feed water pressure to high pressure pump is low, FEED PRESSURE LOW red light (2) goes on.
(2)
High pressure pump has excessive discharge pressure, HIGH PRESSURE PUMP PRESSURE HIGH light (3) goes on.
(3)
Product water pressure is excessive, PRODUCT PRESSURE HIGH red light (4) goes on.
(4)
Clean/flush tank level too low, CLEAN/FLUSH TANK LOW LEVEL light (5) goes on.
d.
RO Element Performance. Use the portable TDS meter to measure the TDS at the four RO vessel sample valves (Figure 2-6,
16 thru 19) and at the combined sample (20).
(1)
Compare the combined TDS with the maximum calculated using Table 2-23. If greater, refer to troubleshooting Table 3-1.
(2)
Compare the TDS readings for the top two vessels (16 and 17). If the difference between the two is more than given by
Table 2-26, the vessel with the higher TDS has internal O-ring leakage. Follow the procedures of para. 3-28 and check
for damaged O-rings. Repeat this procedure for the bottom vessels (18 and 19).
Table 2-26. RO Vessel Maximum TDS Difference
Maximum
Raw Water
Vessel TDS
TDS
Difference
100 to 1,500
50
1,500 to 2,500
50
2,500 to 5,000
50
5,000 to 10,000
75
10,000 to 15,000
110
15,000 to 25,000
210
25,000 to 35,000
300
35,000 to 40,000
400
45,000 to 50,000
500
2-110 Change 12
