EVAPCO AT 110-112, Инструкция по эксплуатации и обслуживанию

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Troubleshooting
(Follows)
Problem Possible Cause Remedy
Blade rubbing inside of
fan cylinder (induced
draft models)
Improper water
treatment, insufficient
bleed rates or excessive
cycling of the fan
motors, or simply high
concentrations of solids
in water.
Make-up water pressure
too high
Debris in solenoid
Frozen float ball
Float ball is full of water
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
Incorrect water level
This is normal
Problem with make-up
line.
If multi-cell unit, there
may be an elevation
problem.
Adjust cylinder to provide blade tip clearance.
This is not necessarily an indication that there is something wrong
with the unit, or with the water treatment. Scale should not be
removed using a power washer or wire brush becuase 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. Please note that the time required for soaking the inlet louvers
depends on the severity of the scale buildup.
Mechanical make-up valve water pressure must be between 140 and
340 kPa. If pressure is too high, the valve will not close. A pressure
reducing valve can be added to lower the pressure. For the 3 Probe
Electronic Water Level Control Package, the electrical actuator has a
35 to 700 kPa bar 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
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.
Fan Noise
Scaled Inlet Louvers on
AT Units
Makeup Valve Will Not
Shut Off
Water Constantly
Blowing Out Overflow
Connection
Water Intermittently
Blowing Out Overflow
Connection
Cooling Tower
Cold Water Basin
Overflowing