30
Problem Possible Cause Remedy
Improper water treatment,
insufficient bleed rates or
excessive cycling of the
fan motors, or high
concentrations of solids in
water.
Initial start-up
Mechanical failure
Electrical issue
Misconception of head
increase or decrease
Make-up water pressure
too high
Debris in solenoid
Frozen float ball
Float ball is full of water
This can happen on
forced dra units due to
the positive pressure in
the casing section.
Overflow connection has
not been piped at all or
properly
Incorrect water level
This is normal
Problem with make-up
line.
If multi-cell unit, there
may be an elevation
problem.
Electronic Water Level
Control
Float Ball not set correctly
Scale should not be removed using a power washer or wire brush
because it could damage the louvers. Remove the louver assemblies and
let them soak in the cold water basin of the unit. The water treatment
chemicals in the unit will neutralize and dissolve the buildup of scale.
NOTE: The time required for soaking the inlet louvers depends on
the severity of the scale buildup.
NOTE: This assumes chemicals are being used.
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, aer a few hours, the pump amp
readings will reduce and level off.
Verify that the pump can turn freely by hand. If not, pump most likely
needs to be replaced.
Verify that the pump has been wired properly. Verify that the voltage
supplying the pump is correct.
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.
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
125 psi water pressure requirement.
Clean out solenoid of any debris.
Inspect, and if so, float or valve may need to be replaced.
Check ball for leaks and replace.
Pipe the overflow with a P-trap to an appropriate drain.
Verify actual operating level versus O&M recommended levels
This is normal. The bleed line for the unit is piped to the overflow
connection
Refer to Makeup Valve or Electronic Water Level section.
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
Adjust float ball up or down to obtain proper water level.
NOTE: The float ball is set to the operating level at the factory.
Scaled Inlet Louvers on
AT Units
Overamping Pump
Motors
Makeup Valve Will Not
Shut Off
Water Constantly
Blowing Out Overflow
Connection
Water Intermittently
Blowing Out Overflow
Connection
Cold Water Basin
Overflowing
Low Pan Water Level
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