TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6.
7.
8.
Step 5. Shut down ROWPU and generator. Refer to electrical drawings in Appendix D and check continuity,
point-to-point, from transformer T1(X1) (REF: Interconnection diagram FO-2, Sheet 10) to relay K3(C2Y) and
to K11(A2X). Repeat the procedure from T1(X2) to J14B (REF: Interconnection diagram FO-2, Sheet 9).
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace circuit breakers CB7 or CB9 (REF: Interconnection diagram FO-2, Sheet 8) if open (para.
2-23). Normally closed,
(c) Replace switch PB3 (REF: Interconnection diagram FO-2, Sheet 11) if open (para. 2-22). Normally
closed.
(d) Replace/repair connector J14 if faulty (para. 2-21).
Step 6. Check continuity from relay K3(C2Y) to J14A. Depress the indicating plunger on K3 during the test. Check
continuity from relay K11(A2X) to J14A. Depress the indicating plunger on K11 when testing its contact.
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace/repair connector J14 if faulty (para. 2-21).
(c) Replace relays K3 or K11 if their contact shows an open circuit when the plunger is pushed (para.
2-23),
Media filter outlet light does not work. Light test okay. Media filter outlet does not show the actual position. (Ref.
Schematic diagram FO-1, sheet 7, schematic 719).
Shut down ROWPU and generator, Refer to electrical drawings in Appendix D and remove the #2A wire from PL16
(REF: Interconnection diagram FO-2, Sheet 12). Check continuity, point-to-point, from CB9 (REF: Interconnection
diagram FO-2, Sheet 8) to wire #282 on PL16,
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace/repair J14 (REF: Interconnection diagram FO-2, Sheet 9) if faulty (para. 2-21).
(c) Replace/repair P14 (REF: Interconnection diagram FO-2, Sheet 15) or J41 (REF: Interconnection
diagram FO-2, Sheet 15) if faulty (para. 2-17).
(d) Replace LTK2 (REF: Interconnection diagram FO-2, Sheet 7) if its contact is open (para. 2-23).
Backwash inlet valve will not open (system backwash position). Valve light off. (Ref. Schematic diagram FO-1, sheet 7,
schematic line 709).
Step 1. Shut down the ROWPU and open the control panel. Restore power to the control panel. Turn off the raw
water pump circuit breaker CB4, the booster pump circuit breaker CB5, and the high pressure pump breaker
CB6 (REF: Interconnection diagram FO-2, Sheet 10). Disconnect the backwash chlorine pump, connector
J45 (REF: Interconnection diagram FO-2, Sheet 15). Drain the media filter down until water stops coming out
oft he top media filter drain valve. 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.
Step 2. Shut down ROWPU and generator, Remove connector P14 (REF: Interconnection diagram FO-2, Sheet 15)
from the side of the control panel, Depress the indicating plunger on relay K11 and check that there is no
continuity across the K11 contact A1X/A1Y.
Replace relay K11 if there is continuity across its contact with the indicating plunger pushed in (para. 2-23).
Backwash inlet valve will not close (system normal). Valve light on (Ref. Schematic diagram FO-1, sheet 7, schematic
line 709).
Step 1.
Step 2.
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 10).
Shut down the ROWPU and open the control panel. Repower the panel to the point of starting the pumps in
system “NORMAL”. Check that the indicating plunger on relay K11 (REF: Interconnection diagram FO-2,
Sheet 6) is out.
If the plunger is in, refer to media filter backwash circuit troubleshooting.
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