TM 10-4610-232-34
Table 2-1. Direct Support Troubleshootlng Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
Corrective ACTION
1. Raw water pump heater does not work. (Ref. Schematic diagram FO-1, sheet 11, schematic lines 1105-1108).
NOTE
Circuit breaker 13 (REF: Interconnection diagram FO-2, Sheet 8) is a ground fault
breaker. High humidity or moisture around devices controlled by this breaker may
occasionally cause trouble. Check that atmospheric moisture is not causing the tripping
by drying out anything controlled by this breaker, including wire connections.
Shut down ROWPU and generator, Refer to electrical drawings in Appendix D. Check continuity, point-to-point, from
transformer T2(1C) to J18D (REF: interconnection diagram FO-2, Sheet 9). Do the same from transformer T2(2C)
(REF: Interconnection diagram FO-2, Sheet 10) to J18E.
(a) Repair any loose or damaged wires (para. 2-20).
(b) Replace auxiliary contact MS3-1 (REF: Interconnection diagram FO-2, Sheet 10), if it shows open
(para. 2-25).
(c) Replace switch SS6 (REF: interconnection diagram FO-2, Sheet 12), if open (para. 2-22).
(d) Replace circuit breaker CB13 (REF: Interconnection diagram FO-2, Sheet 8), if it is open (para. 2-23).
2. Distribution pump heater does not work. (Ref. Schematic diagram FO-1, sheet 11, schematic lines 1110-1113).
NOTE
Circuit breaker 14 (REF: Interconnection diagram FO-2, Sheet 8) is a ground fault
breaker. High humidity or moisture around devices controlled by this breaker may
occasionally cause troubles. Check that atmospheric moisture is not causing the
tripping by drying out anything controlled by this breaker, including wire connections.
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Check continuity, point-to-point, from
transformer T2(1C) (REF: Interconnection diagram FO-2, Sheet 10) to J15J (REF: Interconnection diagram FO-2,
Sheet 9). Do the same from transformer T2(2C) to J15K.
(a) Repair any loose or damaged wire (para, 2-20).
(b) Replace auxiliary contact MS2-1 (REF: Interconnection diagram FO-2, Sheet 10), if it shows open
(para. 2-25).
(c) Replace switch SS6 (REF: Interconnection diagram FO-2, Sheet 12), if open (para. 2-22).
(d) Replace circuit breaker CB14, if it is open (para. 2-23).
PUMP SKID HEATER.
1. Pump skid heater does not work (no heat, no fan). (Ref. Schematic diagram FO-1, sheet 5, schematic lines 512-516).
Shut down ROWPU and generator. Refer to the electrical drawings in Appendix D. Check continuity, point-to-point,
from the power distribution block (PDB) (REF: Interconnection diagram FO-2, Sheet 10) to J20 (REF: Interconnection
diagram FO-2, Sheet 16) on the following lines: AL1 to J20D, AL2 to J20E, and AL3 to J20F. Disconnect the J20
connector when testing.
(a) Repair any loose or damaged wires (para. 2-20).
(b) Replace circuit breaker CB17 (REF: Interconnection diagram FO-2, Sheet 10) if it is open on any
phase (para. 2-25).
(c) Replace/repair the heater if the above checks have not located the problem (para. 2-69).
2. Pump skid healer fan motor runs but there is no heat (see Figure 2-69 for heater circuits).
Step 1. Disconnect connector P66 (REF: Interconnection diagram FO-2, Sheet 16) from the high pressure assembly
junction box. Open the heater electrical access panel. Check continuity between T1-T2 (REF: Interconnection
diagram FO-2, Sheet 10), between T2-HL3, and between T1-HL3. It should be zero or near zero when the
meter is set on the Ohms x 1 scale.
Replace the heater elements if the reading is infinity on any pair (para. 2-69).
2-14
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