Table 3-1. Direct Support Troubleshooting-continued
TEST OR INSPECTION
REVERSE OSMOSIS (R.O.) PUMP ASSEMBLY - continued
REVERSE OSMOSIS (R.O.) PUMP STOPS AND/OR FAILS TO START (Models WPES-20 and H-9518-2).
Check if circuit breaker CB 1 and/or heater assembly are tripped. TRIPPED window will show white if
If circuit breaker or heater assembly is tripped, go to Malfunction 3, R.O. Pump Assembly.
Check if DS8 (HIGH PRESSURE) or DS9 (LOW PRESSURE) lamps on control box are ON at normal
If DS8 is ON at operating pressure of less then 1100 psi, replace high pressure switch, S10. Refer to
If DS9 is ON at operating pressure of 10 psi or above, replace low pressure switch, S9. Refer to
Check if other pumps operate.
If other pumps are inoperable, go to Malfunction 1, ROWPU Assembly.
Check relay window to see if relay is ON.
If relay is not ON, go to step 8.
Shut down power at pump switch and disconnect R.O. pump cable at J6 (back ofjunction box).
Momentarily flip pump switch to START and check for 208 VAC, three phase power at connector, J6.
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.
If voltage is measured in all three tests (A-B, A-C and B-C), go to step 7.
3-50 Change 1