Table 3-1. Direct Support Troubleshooting - continued
TEST OR INSPECTION
REVERSE OSMOSIS (R.O) PUMP ASSEMBLY - continued
REVERSE OSMOSIS (R.O.) PUMP CIRCUIT BREAKER (CB1) AND/OR OVERLOAD HEATERS TRIP.
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. Remove power at power source, reset CBl/heater assembly and disconnect wires on CB1 output
terminals (T1 , T2 and T3).
Step 2. Turn on power at power source and momentarily flip pump switch to START.
If circuit breaker trips, check for bare or disconnected wires between power source and
CB1 and repair or replace it. If trouble persists, replace CB1. Refer to Paragraph 3-53.
Step 3. Remove power at power source, reconnect wires to circuit breaker and disconnect R.O. motor pump
cable assembly at J6 (back of junction box).
Step 4. Turn on power at power source and momentarily flip pump switch to START.
If heater assembly trips, turn off power at power source and check for defective heaters. Replace as
necessary (Paragraph 3-61). If trouble persists, replace motor starter. Refer to Paragraph 3-61.
Step 5. Disconnect cable assembly at R.O. pump motor and check it for shorts.
If shorted, repair power cable assembly. Refer to Paragraph 3-26.
If cable assembly is not shorted, repair pump motor. Refer to Paragraph 3-43.