Table 3-1. Direct Support Troubleshooting - continued
TEST OR INSPECTION
REVERSE OSMOSIS (R.O.) PUMP ASSEMBLY
1. PUMP SHUTS DOWN 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 CB1 and/or heater assembly are tripped.
If circuit breaker or heater assembly is tripped, go to Malfunction 2, R.O. Pump
Step 2. Check if DS8 (HIGH PRESSURE) or DS9 (LOW PRESSURE) lamps on control box
are ON at normal operating pressure
a. If DS8 is ON at operating pressure of less then 1000 psi, replace high pressure
b. If DS9 is ON at operating pressure of 10 psi or above, replace low pressure switch,
Step 3. Check if other pumps operate.
If other pumps are inoperable, go to Malfunction 1, ROWPU Assembly.
Step 4. Check relay window to see if relay is ON
If relay is not ON, go to step 8.
Step 5. Check for 208 VAC, three phase power at connector, J6 (back of junction box)
b. If voltage is measured in all three tests ( A-B, A-C and B-C), go to step 7.