Table 3-1. Direct Support Troubleshooting - continued
TEST OR INSPECTION
DISTRIBUTION PUMP ASSEMBLY
1. DISTRIBUTION PUMP STOPS AND/OR FAILS TO START.
High voltages in this equipment can cause serious injury or death
When applying power during a test, take proper measures to
ensure personal safety Never work on electrical equipment unless
there is another person nearby who is familiar with the operation
and hazards of the equipment and who is competent in
administering first aid.
Step 1. Check if circuit breaker CB5 and/or heater assembly are tripped
If circuit breaker, heater assembly, or both are tripped, go to Malfunction 2,
Distribution Pump Assembly.
Step 2. Check if other pumps operate
If other pumps are inoperable, go to Malfunction 1 ROWPU Assembly
Step 3. Visually check if relay K5 is ON or OFF
If relay is OFF, go to step 7
Step 4. Check if 208 VAC is available between T1-T2, T2-T3 and T1-T3 on heater assembly.
If voltage is measured in all three tests, go to step 6
Step 5. Remove power at power source and perform a continuity check of power circuit as
follows, make additional point-to-point continuity checks as necessary to find
To check continuity through K6 it is necessary to physically push
in on relay plunger while making the test.
L1, CB4 - J5(A)
L2, CB4 - J5(B)
L3, CB4 - J5(C)