TM 10-4610-240-10
TM 08580C-10/1
T.O. 40W4-13-21
Table 3-2. Troubleshooting (ROWPU) (continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5.
PRODUCT WATER FLOW READING RISES ABOVE 16 GPM (FRESH/BRACKISH), 12 (SEAWATER)
AND
CANNOT BE LOWERED USING REGULATE PRODUCT FLOW VALVE.
Step 1.
Check the TDS of product water from each R.O. vessel: WARNING Water is under pressure and
will discharge rapidly. DO NOT disconnect product water hoses.
a. Use sample valves (figure 2-41) to collect product water sample. Do NOT disconnect product
water hoses.
b. Check TDS of sample from each R.O. vessel using TDS meter without range extender
c. Use readings to make a chart similar to the following:
NOTE
R.O. Vessel
TDS (ppm)
Numbers on chart are
1 (-Top)
600
examples only. Yours may
2
900
vary.
3
1100
4 (Bottom)
1400
d. Examine pattern of chart. TDS readings should get larger from top to bottom.
(1)
If any R.O. vessel does not follow this pattern, there is something wrong inside;
disassemble faulty vessel and replace defective items (paragraph 3-4).
(2)
If R.O. vessels all follow this pattern, proceed to Step 2.
Step 2.
Check product water flow from each R.O. vessel.
a. Use same method as in Step 1 to collect product water sample, but this time measure the time in
minutes it takes to fill a 3-gallon bucket with product water from each vessel. Divide 3 by the
number of minutes.
3-7
