TM 10-4610-232-12
Table 4-2. Unit Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
PRODUCT HIGH PRESSURE SWITCH.
Product high pressure alarm is on and product pressure is less than 35 psig (241 kPa) or alarm is not on and pressure is
higher than 45 psig (310 kPa).
Notify direct support maintenance to check operation of the product high pressure switch.
AIR SYSTEM.
1. Noise or burning smell from air compressor drive belt.
Step 1. Check drive belt.
(a) If belt is loose, adjust belt tension (para. 4-78).
(b) If belt cannot be adjusted, replace it (para. 4-78).
Step 2. Check air compressor.
If compressor does not turn easily by hand, replace air compressor (para. 4-80).
2. Oily, white mixture in outlet air filter chamber.
Notify direct support maintenance to disassemble and clean out filter chamber.
3. Outlet air filter chamber leaks.
Notify direct support maintenance to repair chamber.
4. Air system makes a loud whistling noise when the air tank block valve is opened.
Verify that air system has water in it.
Refer to "air lines, air manifolds have water in them" troubleshooting (malfunction 5 below).
5. Air lines, air manifolds have water in them.
NOTE
It is normal for a small spray (mist) of water to be seen when the air manifold drain
valves are opened.
Step 1. Remove the tubing from the backwash air check valve at the media filter. Operate the ROWPU and check
if water flows out of the check valve.
(a) If water comes out of the check valve, disassemble check valve and clean it out (para. 4-53).
(b) Disassemble backwash air solenoid valve and clean it out. Blow air through the tubing lines until
no water is seen (para. 4-51).
(c) If cleaning the check valve fails to stop water leakage, replace the backwash air check valve (para.
4-53).
NOTE
Check valve must be installed with the arrow pointing to the media filter.
Step 2. Check the air blanket check valve. Remove the check valve from the air blanket solenoid valve (para.
4-51).
(a)
(b)
(c)
(d)
Operate the ROWPU and check if air or water flow out of the check valve.
If water comes out of the check valve, disassemble check valve and clean it out (para. 4-51).
Disassemble air blanket solenoid valve and clean it out (para 4-51).
Blow air through the tubing Iines until no water is seen.
If cleaning the check valve fails to stop water leakage, replace the air blanket check valve (para.
4-51).
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