TM 10-4610-240-24
TM 08580C-24/2
TO 40W4-13-22
Table 2-2. Unit Troubleshooting - continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
BACKWASH PUMP ASSEMBLY
4.
BACKWASH OPERATION FAILS TO STOP.
Step 1.
Check If timer is tripped.
a
If timer is tripped, press PUSH TO RESET switch and go to step 2.
b
If timer Is not tripped, go to step 3.
Step 2.
Restart backwash operation.
If timer trips again, replace timer assembly Refer to paragraph 2-78.
WARNING
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 3
Check for 115 VAC on terminal board, TB-1 and TB-2 (ground) in timer.
a
If voltage is measured, replace timer assembly Refer to paragraph 2-78.
b
If voltage is not measured, notify Direct Support Maintenance.
5.
BACKWASH PUMP STOPS DURING AND/OR FAILS TO START IN MULTIMEDIA FILTER CLEANING
OPERATION.
Step 1
Check If CB2 and/or K2 heater assembly in junction box are tripped.
If either are tripped, go to step 2 of Malfunction 3, Backwash Pump Assembly.
Step 2
Check If stager cycles.
If stager cycles, go to step 2 Malfunction 3, Backwash Pump Assembly.
2-50
