Table 4-2. Unit Troubleshooting Guide (Continued)
TEST OR INSPECTION
Refer to Figure 4-1 for Electric Heater Wiring Diagram.
1. High pressure pump assembly electric heater does not work (no heat, no fan) (Reference Schematic Diagram FO-1, sheet 5,
schematic lines 512-516).
Check that the FAN-HEAT toggle switch on top of the heater is set to HEAT.
Set it to the HEAT position.
Check generator voltage on all tree phases. It must be 435-445 VAC on each phase.
(a) Adjust to correct voltage.
(b) If voltage is not correct on all three phases, refer to generator troubleshooting.
Shut down the ROWPU. Shut down the generator. Refer to electrical schematic Appx. -1 and Interconnect diagram
Appx. 1-2. Check continuity, point-to-point, from P20D to J66A, P20E to J66B, P20F to J66C, and P20H to J66D
(Reference Interconnection Diagram FO-2, sheet 16). Check each lead for shorts between phases and shots to the
groundwire. The reading should be infinity for each check.
(a) Replace any cable that shows open during continuity checks (para. 4-27).
(b) Replace any cable that shows a short between phases or a short to ground (para. 4-27).
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