Table 3-1. Direct Support Troubleshooting-continued
TEST OR INSPECTION
BACKWASH PUMP ASSEMBLY
BACKWASH PUMP STOPS AND/OR FAILS TO START (R.O. ELEMENT CLEANING - Models WPES-
10, H-9518-1, WPES-30 and H-9518-3).
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.
Check if circuit breaker CB2 and/or heater assembly are tripped. TRIPPED window will show white if
If circuit breaker or heater assembly is tripped, go to Malfunction 5, Backwash Pump Assembly.
Check if other pumps operate.
If other pumps do not work, go to Malfunction 1, ROWPU Assembly.
Check if relay K2 is on.
If relay is not on go to step 7.
Turn pump off at pump switch and disconnect backwash pump at junction box connector. Flip pump
switch to START and release. Check voltage at BACKWASH PUMP jack, J2.
If 208 VAC is measured in all three tests (A-B, A-C and B-D), go to step 6.
Turn power off at power source and perform a continuity check of power circuits as follows. Make
additional point-to-point checks as necessary to find defective components:
To check continuity through K2, it is necessary to close contacts by raising handles on
side of relay.
3-78 Change 1