TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
COTTRECTIVE ACTION
9. Backwash cycle phase 3. (Ref. Schematic diagram FO-1, sheet 7, schematic lines 724-727) (TDK3 setting 10 minutes).
Step 7. Shut down the ROWPU. Open the control panel. Restore power to the control panel. Turn off the raw water
pump circuit breaker CB4 and the boost pump circuit breaker CB5 (REF: Interconnection diagram FO-2,
Sheet 10). Disconnect the backwash chlorine pump, connector J45 (REF: interconnection diagram FO-2,
Sheet 15). Set the control panel up in system “BACKWASH” and push “INITIATE”. Check that the backwash
air inlet valve pilot light goes out at the end of phase 2 of the backwash cycle. Check that the inner pointer on
TDK2 (REF: Interconnection diagram FO-2, Sheet 8) is on zero.
If the valve light has not gone off or if the time inner dial is not on zero, refer to backwash phase 2
troubleshooting.
Step 2. Check that the inner dial on TDK3 (REF: Interconnection diagram FO-2, Sheet 8) starts moving toward zero.
If it is not moving, go to step 4.
Step 3. Check that the indicating plunger on K14 (REF: Interconnection diagram FO-2, Sheet 7) pulls in.
If it does not pull in, go to step 7.
Step 4. Shut down ROWPU and generator. Refer to electrical drawings in Appendix D and remove connector P16
(REF: Interconnection diagram FO-2, Sheet 15) from the side of the control panel and the wires from terminal
2 of TDK3. Check continuity, point-to-point, from CB9 (REF: Interconnection diagram FO-2, Sheet 8) (wire
#264) to TDK2 (terminal 9). (Schematic line 727.) Depress the indicating plunger on relay K11 (REF:
Interconnection diagram FO-2, Sheet 6) when testing its contact. Check continuity, point-to-point, from
transformer T1(X2) (REF: Interconnection diagram FO-2, Sheet 10) to TDK3 (wire #2A).
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace relay K11 if its contact does not close when the indicating plunger is depressed (para. 2-23).
Step 5. Check continuity from TDK2 (terminal 8) to TDK3 (terminal 1).
Repair any loose or damaged wire (para. 2-20).
Step 6. Check continuity from TDK3 (terminal 1) to TDK3 (terminal 8).
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace time TDK3 if the checks in steps 4-6 have not isolated the problem (para. 2-23).
Step 7. Shut down ROWPU and generator. Refer to electrical drawings in Appendix D and remove connector P16
from the side of the control panel and the wires from K2 (REF: Interconnection diagram FO-2, Sheet 6) of K14.
Check continuity, point-to-point, from CB9 (wire #264) to TDK2 (terminal 9). (Schematic line 727.) Depress
the indicating plunger on relay K11 when testing its contact. Check continuity, point-to-point, from
transformer T1(X2) to K14 (wire #2A).
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace relay K11 if its contact does not close when the indicating plunger is depressed (para. 2-23).
Step 8. Check continuity, point-to-point, from TDK2 (terminal 8) to relay K14(K1).
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace timer TDK4 (REF: Interconnection diagram FO-2, Sheet 8) if its terminals 9-10 do not show
continuity (para. 2-23).
(c) Replace relay K14 if the check in steps 7-8 have not located the problem (para. 2-23).
10. Backwash cycle phase 4. (Ref. Schematic diagram FO-1, sheet 7, schematic lines 721 and 732) (TDK4 timer setting 1.5
minutes).
Step 1. Shutdown the ROWPU. Open the control panel. Restore power to the control panel. Turn off the raw water
pump circuit breaker CB4 and the boost pump circuit breaker CB5 (REF: Interconnection diagram FO-2,
Sheet 10). Disconnect the backwash chlorine pump, connector J45 (REF: Interconnection diagram FO-2,
Sheet 15). Set the control panel up in system “BACKWASH” and push “INITIATE’. Check that the indicating
plunger on relay K13 (REF: Interconnection diagram FO-2, Sheet 6) comes out at the end of phase 3 of the
backwash cycle. Check that the inner pointer on TDK3 (REF: Interconnection diagram FO-2, Sheet 8) is on
zero.
if the plunger on K13 does not come out or if the timer inner dial is not on zero, refer to backwash phase 3
troubleshooting.
Step 2. Check that the inner dial on TDK4 (REF: Interconnection diagram FO-2, Sheet 8) starts moving toward zero.
If it is not moving, go to step 7.
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