FLOATLESS LIQUID LEVEL CONTROL
The sensing elements of a floatless liquid level control consists of 2 electrodes suspended in the well by insulated wires. These wires connect to a relay which serves as a pilot switch to the starting equipment. The lower electode is set just above the pump, and the upper at some distance below the static water level. The device cuts off power to the pump automatically when the water level drops below the lower electrode, and does not restore power until the water level recovers to reach the upper electrode. The Liquid Level Control can also be used as a pilot switch in connection with elevated tanks.
I. OPERATIONAL CHECKUP
The most reliable indication of the condition of a submersible pump are:
(a)The current drawn by the motor
(b)The insulation resistance of the installation below ground.
As the pump wears, the motor current increases, until eventually the overloads trip to protect the motor. While this automatic protection looks after an emergency situation, proper care of a submersible installation should include perioodic
Record the insulation resistance and the running current for future reference. When the insulation resistance
fall below 10 Megohms, check it frequently for further deterioration and pull the pump when the resistance falls to 1/2 megohm.
When pulling the pump, either coil the cable on a reel or raise it from the ground to dry. Check the insulation again when the cable and splices are dry. If the insulation value is between the line and motor casing increases
to 50 megohms or more, isolate the fault in the cable or the splice and make the necessary repairs. However, if the insulation reading remains low, disconnect the motor from the cable and check the motor separately. Should the motor be defective, check the pump end for wear and obtain a replacement for either the motor alone, or the pump unit, as necessary.
WARNING
HAZARDOUS VOLTAGE- CAN SHOCK, BURN,
OR EVEN KILL.
J. TROUBLESHOOTING
1.Disconnect power unless required for testing.
2.Have electrical testing done by a qualified electrician.
3.Most problems occur above ground. Remove pump only as a last resort.
When troubleshooting or servicing the pump, use all precautions for the voltages involved.
PROBLEM | POSSIBLE CAUSE | REMEDY | ||
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| 1. | Electrical trouble | Check Power source: | |
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| starter & reset | |
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Unit fails |
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| Check resistance: | |
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| cable and motor | ||
to start |
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| Call Dealer or Electrician | ||
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| 2. | Pump Sandlocked | Call Dealer: pull pump | |
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| and clean | |
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| 1. | Insufficient well yield: | Reset pump lower into well | |
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| water level has dropped. |
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| Restrict flow to yield | ||
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Pump fails | 2. | Clogged intake screen | Pull pump | |
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to deliver | 3. Air Lock in pump | Start and stop pump | ||
water |
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| several times and allow 1 | |
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| min. between | |
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| 4. | Leak in discharge | Raise pipe until leak is found. | |
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| 1. | Screen or pump partly | Pull pump and clean | |
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| plugged |
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| 2. | Insufficient well yield | Check water level: lower | |
Reduced |
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| pump if permissible. | |
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pump | 3. Worn pump - excessive | Replace worn parts | ||
output |
| wear due to abrasives. |
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| 4. | Low voltage | Call Electrician | |
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| 5. Three Phase unit | Reverse rotation | ||
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| running backward |
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Overload | 1. | Worn pump or pump | Pull pump and clean or | |
| bound by sand | replace worn parts. | ||
trips |
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2. | Electrical trouble | Call Dealer or Electrician | ||
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| 1. | Pressure switch out of | Readjust to correct setting | |
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| adjustment | or replace | |
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Unit cycles | 2. Leaks in service line | Locate and correct | ||
too | 3. Check valve leaking | Replace | ||
frequently |
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4. | Water logged tank | Check tank for leaks be | ||
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| sure fittings are functioning | |
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| properly. | |
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