Table 2-2. Unit Troubleshooting - continued
TEST OR INSPECTION
PUMP ASSEMBLY SHUTS DOWN AND/OR FAILS TO START IN R.O. ELEMENT
High voltages in this equipment can cause serious injury or death. When applying power
during a test, take proper measures to ensure safety of personnel. Never work on
electrical equipment unless there is another person nearby who is familiar with the
operation and hazards of the equipment.
Step 1. Check if circuit breaker CB2 and/or heater assembly of motor starter K2 in junction
box are OFF. TRIPPED window in heater assembly of K2 will indicate white, if
heater assembly is tripped.
If CB2 and/or heater assembly are tripped, go to step 5.
If CB2 and/or heater assembly are not OFF, continue with step 2.
Step 2. Turn CB2 to OFF and disconnect pump adjunction box.
Step 3. Turn CB2 to ON and check for 208 VAC, three phase power, at BACKWASHI PUMP
If 208 VAC is not measured in all three tests (A-B, B-C and A-C), notify Direct Support
Step 4. Disconnect pump cable assembly at backwash pump motor (Paragraph 2-16) and
check it for continuity.
If cable assembly is defective (open), replace it. Refer to Paragraph 2-16.
If cable assembly is not defective, replace centrifugal pump. Refer to
Step 5. Turn off power at generator and disconnect backwash pump at junction box. Check for
shorts between pins A - B, A - C and B - C, and from pin D to pins A,B and C, in turn
on BACKWASH PUMP jack, J2.
If continuity, indicating a short, is measured, notify Direct Support Maintenance.