Basin Section Problems

Potential Problems:

Potential Causes:

Remedy:

Mechanical make-up valve water pressure must be between 20 and 50psi. If pressure is too high, the valve will not close. A pressure reducing valve can be added to lower the pressure. For the 3 and 5 Probe Electronic Water Level Control Package, the electrical actuator has a 5 to 100 psi water pressure requirement.

Remedy:

Clean out solenoid of any debris.

Remedy: 

Inspect, and if so, float or valve may need to be replaced.

Remedy:

Check ball for leaks and replace.

This can happen on forced draft units due to the positive pressure in the casing section. Overflow connection has not been piped at all or properly

Remedy:

Pipe the overflow with a P-trap to an appropriate drain.

Remedy:

Verify actual operating level versus O&M recommended levels.

This is normal. The bleed line for the unit is piped to the overflow connection.

Remedy:

Refer to Makeup Valve or Electronic Water Level section

Remedy:

Make sure that multi-cell units are installed level to one another. If they are not, it can cause overflowing in one cell.

See EWLC Section

Remedy:

Adjust Float Ball up or down to obtain proper water level.

NOTE: The float ball is set to the proper operating level at the factory.

  • The valve won't open or close

    1. Verify the water pressure is above 5psi, and below 100psi
    2. Verify wiring with wiring diagram. Check supply voltage.
    3. Verify there is not a blockage in the Y-Strainer
    4. Confirm the probes are not dirty
    5. Check Red LED on circuit board. If it is on, the valve should be closed
For a 3-Probe Assembly:

  • LED OFF After cleaning the probes, lift probe assembly out of the stand pipe. This will simulate a "low water condition". Check the contacts for proper position.
  • The contact between "C" and "NC" should now be closed and water makeup valve should be energized (valve open)

  • LED ON
  • Connect a jumper wire between the longest probe and the shortest probe. The contact between "C" and "NC" should now be open and the water makeup valve should be de-energized (valve closed)
  • The valve won't open or close

    1. Verify the water pressure is above 5psi, and below 100psi
    2. Verify wiring with wiring diagram. Check supply voltage.
    3. Verify there is not a blockage in the Y-Strainer
    4. Confirm the probes are not dirty
    5. Check Red LED on circuit board. If it is on, the valve should be closed
For a 5-Probe Assembly:


After cleaning the probes, lift probe assembly out of the stand pipe. This will simulate a "low water condition". Check the contacts for proper position.
  • Differential Contacts: C to NC - closed - Water make-up valve energized - LED = OFF
  • High Alarm Contacts: C to NO - open - High alarm circuit de-energized - LED = OFF
  • Low Alarm Contacts: C to NC - closed - Low alarm circuit energized - LED = OFF


Connect a jumper wire between the longest probe (ground) and all other probes (high limit, high alarm, and low alarm). Check the contacts for proper position.

  • Differential Contacts: C to NC - open - Water make-up valve de energized
  • LED ON
  • High Alarm Contacts: C to NO - closed - High alarm circuit energized
  • LED ON
  • Low Alarm Contacts: C to NC - open - Low alarm circuit de energized
  • LED ON

Remedy:

If the unit has only run for a few hours, the pump may overamp until the pump wear ring has worn in. In this case, it would only be small percentages, not 15 or 20%. Normally, after a few hours, the pump amp readings will reduce and level off.

Remedy:

Verify that the pump can turn freely by hand. If not, pump most likely needs to be replaced.

Remedy:

Verify that the pump has been wired properly. Verify that the voltage supplying the pump is correct.

Remedy:

Note: Increase or decrease in pump flow as a result of clogged or blown out nozzles or headers should NOT cause the pump to over amp.