T M 1 0 - 4 6 1 0 - 2 3 2 - 1 2
Table 4-2. Unit Troubleshooting Guide (Continuad)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 7. Shut power off. Refer to the electrical schematic and check continuity, point-to-point, from P15H to
J33D and from P15I to J33E.
Replace the cables and connectors if faulty (para. 4-27).
19. CLEAN/FLUSH OUTLET valve light does not work. Light tests okay. CLEAN/FLUSH OUTLET valve light does
not show the actual valve position (Reference Schematic Diagram FO-1, Sheet 7, schematic line 736).
Step 1.
Step 2.
Check the actual position of the valve.
Refer to the general note on ‘AUTOMATIC VALVES” and compare the actual position of the valve
to what its indicator light is showing.
Check for damage wires on the valve actuator. Check the limit switches on the valve actuator for
damage. Power off. Disconnect the valve electrical connector J33 and check for continuity across
P33A and P33C when the valve stem is retracted into the actuator housing (valve open).
(a) Repair any damaged wires (para. 4-47).
(b) Replace the valve limit switch (LS7) (Reference Interconnection Diagram FO-2, Sheet 14) if
the actuating lever is broken or if there is no continuity across P33A/C (para. 4-47).
20. Media filter flush valve light does not work. Light tests okay. Media filter flush valve light does not show the
actual valve position (Reference Schematic Diagram FO-1, Sheet 7, schematic line 707).
Step 1. Check the actual position of the valve.
Refer to the general note on ‘AUTOMATIC VALVES” and compare the actual position of the valve
to what its indicator Iight is showing.
Step 2. Check for damaged wires on the valve actuator. Check the limit switches on the valve actuator for
damage. Disconnect the valve electrical connector J48 and check for continuity across P48A and
P48C (Reference Interconnection Diagram FO-2, Sheet 15) when the valve stem is retracted into the
actuator housing (valve open).
(a) Repair any damaged wires (para. 4-47).
(b) Replace the valve limit switch (LS1) (Reference Interconnection Diagram FO-2, Sheet 15) if
the actuating lever is broken or if there is no continuity across P48A/C (para. 4-47).
21. Media filter flush valve will not open in fitter backwash or when the flush valve switch is pushed. MEDIA FILTER
FLUSH valve light off (Reference Schematic Diagram FO-1, Sheet 7, schematic lines 706-707).
Step 1. Check valve for actual position.
(a) Refer to automatic valve general notes.
(b) If valve is open, refer to valve light does not show correct valve position troubleshooting(mal-
function 20).
Step 2. Disconnect the valve electrical connector P48. Check for 110-120 VAC across pins J48D (Reference
Interconnection Diagram FO-2, Sheet 15) and J48E.
If there is voltage present, notify direct support maintenance.
CAUTION
Even after closing the block valve in the next step there will be 85 psig (586 kPa) air in
the tubing to the automatic valve. Be careful when disconnecting the tubing at the
block valve. Slowly back off the tubing nut to allow air pressure drainage.
Step 3. Close the air block valve at the air manifold for the backwash outlet valve. Disconnect the air tubing to
the valve actuator. Check if the valve stem retracts into the actuator.
(a) If the stem retracts, repair the valve actuator by replacing the air control relay and solenoid
valve (para. 4-47).
(b) If the stem does not retract, or if it retracts with a jerky motion, replace the actuator (para.
Change 1
4-59
4-47).
