Table 4-2, Unit Troubleshooting Guide (Continued)
TEST OR INSPECTION
3. MEDIA FILTER INLET light does not work Light tests okay. MEDIA FILTER INLET light does not show the
actual valve position (Reference Schematic Diagram FO-1, Sheet 7, schematic line 716).
Step 1, Check the actual position of the valve.
Refer to the AUTOMATIC VALVES general note and compare the actual position of the valve to
what the indicator light 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 J39 and check for continuity across P39A and
P39C (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 (LS4) (Reference Interconnection Diagram FO-2, Sheet 15) if
the actuating lever is broken or if there is no continuity across P39A/C (para. 4-47).
4. Media filter outlet valve does not open (system running). Valve light off (Reference Schematic Diagram FO-1
Sheet 7,schematic line 718).
Step 1. Check valve for actual position.
(a) Refer to AUTOMATIC VALVES general notes.
(b) If valve is open, refer to valve light does not show correct valve position troubleshooting (mal-
Step 2. Disconnect the valve electrical connector P41. Check for 110-120 VAC across pins J41 D and J41 E
(Reference Interconnection Diagram FO-2, Sheet 15). If there is voltage present, notify direct sup-
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 disconnect 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 media filter 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 retractor if it retracts with a jerky motion, replace the actuator (para.
5. Media fitter outlet valvewill not close (system backwash position ors stem clean position). MEDIA FILTER
OUTLET valve light on (Reference Schematic Diagram FO-1, Sheet 7, schematic line 718).
Check valve for actual position. Refer to AUTOMATIC VALVES general note.
If valve is closed, refer to valve light does not show correct valve position troubleshooting (malfunc-
Turn off the raw water pump circuit breaker CB4, the booster pump circuit breaker CB5, and the high
pressure pump breaker CB6 (Reference Interconnection Diagram FO-2, Sheet 10). Disconnect the
backwash chlorine pump, connector J45. Disconnect the media filter outlet connector J41. Set the
control panel up in SYSEM CLEAN and push INITIATE. Check for 110-120 VAC across J41D and
If voltage is not present, go to step 7.
Drain the media filter down until water stops coming out of the media filter top drain. Set the control
panel up in SYSTEM BACKWASH and push INITIATE. Observe the backwash air valve light on the
control panel and check for 110-120 VAC across J41 D and J41 E when it comes on.
(a) If the backwash air valve light does not come on, refer to MEDIA FILTER backwashing cir-
(b) If the BACKWASH AIR INLET light comes on and there is no voltage, go to step 7.
Reconnect J41 and check for 110-120 VAC across terminals 4 and 5 on the valve. Follow the control
panel setup as in either step 2 or 3 above when checking voltage on the valve.
If no voltage is present at the terminals, replace the valve cable and connector (para. 4-47).
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