TM 10-4610-240-10
TM 08580C-10/1
T.O. 40W4-13-21
Table 3-1. Troubleshooting (ROWPU) (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2.
RAW WATER FLOW INDICATOR DROPS TO NEAR ZERO; BOTH RAW WATER PUMP LAMPS ARE
ON.
(Continued)
Step 4.
Check to see if input strainer is clogged.
a. Clean debris from input strainer.
b. Shorten strainer rope so it does not rest on bottom of raw water source.
c. Make sure raw water pump is sufficiently close to raw water source.
Step 5.
Check for kinked hoses.
Unkink hoses.
3.
CARTRIDGE FILTER GAUGE RISE ABOVE 20 PSID.
Step 1.
Make a turbidity tube check (paragraph 2-9p) of water taken from DRAIN NO. 1 CARTRIDGE
FILTER valve (Figure 2-38).
a. If water is turbid, shut down ROWPU in normal manner (paragraph 2-14) and change cartridge
filter elements (paragraph 3-5).
b. If water is clear, notify unit maintenance because gauge may be defective.
4.
REDUCED PRODUCT WATER FLOW; R.O. PRESSURE PSI ADJUSTED TO 960 FOR SALTWATER,
500
FOR FRESH AND BRACKISH WATER.
NOTE
ROWPU produces less product water when raw water source temperature drops (1.6% less per
degree fahrenheit drop).
Step 1.
Check R.O. vessels for leaks caused by loose end caps or defective end cap O-rings.
a. Tighten loose nuts (paragraph 3-4h( 15)).
b. Replace defective end cap O-rings (see paragraph 3-4c elements need not be replace).
Step 2.
Check R.O. vessel gauge for reading higher than 100 psid.
NOTE
Membrane scaling may cause reduced product water flow without increasing R.O. vessels pressure.
Cleaning elements when vessel pressure is under 100 psid may improve flow.
a. Clean R.O. elements (paragraph 2-12).
3-6
