TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
Media filler inlet valve does not open (system normal). Valve light off. (Ref. Schematic diagram FO-1, sheet 7, schematic
line 715).
Step 1:
Step 2.
Shut down the ROWPU and open the control panel. Power up the panel to the point of starting the pumps in
system “NORMAL”. Observe the indicating plungers on relays K3 and K11 (REF: Interconnection diagram
FO-2, Sheet 6). They should be out.
If the plunger on K3 is in, refer to control circuits operation mode troubleshooting.
If the plunger on K11 is in, refer to backwashing circuit troubleshooting.
Shut down ROWPU and generator. Remove the wires on relay K3 (terminal C2X) and K11 (terminal A2Y).
Check continuity across K3(C2Y/C2X) and K11 (A2X/A2Y).
If either relay contact shows continuity, replace that relay (para. 2-23). (Should be open.)
2.
Media filter inlet valve will not close (system backwash position on system clean position). Valve light on. (Ref.
Schematic diagram FO-1, sheet 7, schematic line 715).
Step 1.
Check valve for actual position. Refer to automatic valve general notes.
If valve is closed, refer to valve light does not show correct valve position troubleshooting (malfunction 3).
Step 2.
Turn off the raw water pump circuit breaker CB4, the booster pump circuit breaker CB5 (REF:
Interconnection diagram FO-2, Sheet 10), and the high pressure pump breaker CB6 (REF: Interconnection
diagram FO-2, Sheet 10). Disconnet the backwash chlorine pump, connector J45 (REF: Interconnection
diagram FO-2, Sheet 15).
Step 3.
Shut down the ROWPU. Open the control panel and power it back up. Set the control panel up in system
“CLEAN” and push “INITIATE”. The indicating plunger on relay K3 (REF: Interconnection diagram FO-2,
Sheet 6) should go in.
If the plunger does not go in, refer to control circuits operating mode troubleshooting.
Step 4.
Set the control panel up in system “BACKWASH” and push “INITIATE”. The indicating plunger on relay K11
(REF: Interconnection diagram FO-2, Sheet 6) should go in when the backwash air valve light (PL17) (REF:
Interconnection diagram FO-2, Sheet 12) comes on.
If the light does not come on, or if the light comes on but the K11 plunger does not go in, refer to media filter
backwashing circuits troubleshooting.
Change 3
2-34.1/(2-34.2 Blank)
