TM 10-4610-232-12
r.
Remove the silicone sealant from the bottom of bulkhead fitting (66).
s.
Remove level switch (64) from bushing (65) and pull wires (68) through items (65, 66 and 67).
t.
Remove bushing (65) from bulkhead fitting (66) and remove sealing ring (67).
REPAIR.
a.
Repair all unserviceable components by replacement.
b.
Repair leaks at pipe threads using two wraps of antiseize tape on male fittings.
c.
Repair leaks around nuts (52 and 63) by tightening nuts. If that does not work, replace sealing rings (62 and 57).
d.
Wires (68) are enclosed in shrink wrap tubing (69), Repair leaks into the shrink wrap (69) tubing by putting antiseize tape on all
pipe fittings Also, fill bottom hole in fitting (66) with silicone sealant.
e.
Replace gasket (30) if damaged or missing.
f.
Replace inlet strainer (43) is plugged.
g.
Replace damaged or inoperative level switch (64) and wires (68) as an assembly.
NOTE
If level switch assembly must be replaced, proceed with test procedures. If the switch is
being reused, proceed to Reassembly.
a.
Hold switch (64) with clip (72) pointing upward and wires (68) pointing downward as shown in Figure 4-64, sheet 2.
b.
Refer to the inset on Figure 4-64, sheet 2 and find letters P/Len float. P/L must be at clip (72) end of shaft (71). If not, remove
clip (72), and reposition float (70) on shaft (71) with P/L at clip end. Reinstall clip (72).
c.
Turn the switch float (70) over so the letters P/L are up and reinstall the float (70) and clip (72) on the switch shaft (71).
d.
Attach a multimeter set to ohms x 1 to the black wire and either one of the other two wires.
e.
Check for continuity between the two wires while holding the switch (64) with the wires (68) pointing down and the float (70)
bottomed out on the switch shaft (71). If the circuit is open, attach the multimeter to the other colored wire.
f.
The black wire is No. 324. Attach a label (para. 4-10).
g.
When the meter shows continuity, the other tested wire is No. 342 and the third wire is No. 344 (sequestrant tank switch is
No. 346 and the third wire for the sequestrant tank is No. 342). Attach wire labels (para. 4-10).
h.
Check the operation of the switch (64) as follows:
(1)
Wires (68) down/float (70) down...............................................................................................................324 to 342 = continuity
Polyelectrolyte tank.....................................................................................................................................324 to 344 = open
Sequestrant tank .........................................................................................................................................324 to 346 = open
(2)
Wires (68) down/float (70) up....................................................................................................................324 to 342 = open
Polyelectrolyte tank.....................................................................................................................................324 to 344 = continuity
Sequestrant tank .........................................................................................................................................324 346 continuity
NOTE
Reassemble all connections without using excessive force on plastic fittings.
4-228 Change 12
