RHOSS H51369, Инструкция по эксплуатации

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38
8. RICERCA GUASTI
Problem - inconvenience Causes Solution/Remedy
Wrong direction of the air flow through the
cooling tower
Cut-off the electrical supply to the motor-fan set and invert two of the three
phases in the motor supply line
Very low ambient air temperature; in fact
under these conditions, the air is denser
and hence the fan motors may have
absorbed power greater than the name-
plate value. Contact MITA’s technical department for possible advice
Excessive absorbed electric
current by the motor-fan set
Fouled or scaled fill pack (heat exchange
surface) Replace the fill pack (heat exchange surface)
From observation of the rain-zone/water
falling into the basin it is apparent that not
all the spray-nozzles are working uniformly
or without obstructions. Clean or replace the nozzles.
Fouled or scaled fill pack (heat exchange
surface) Replace the fill pack (heat exchange surface)
Drift/droplet eliminators incorrectly
positioned or having a non-uniform surface
cross-section with discontinuities. Restore the eliminator layer to its correct format, or eventually replace it
Entrainment of water outside the
unit
drift/droplet eliminators blocked in some
places Replace the set of eliminator panels
Anomalous setting of the float-ball of the
float-valve Adjust the position of the float-ball Loss of water from the basin
Overflow connection partially or totally
obstructed Remove the obstructing material
Flowrate of the circuit is not in accordance
with the design conditions. Regulate the flowrate
Wrong direction of the air flow through the
cooling tower. Cut-off the electrical supply to the motor-fan set and invert two of the three
phases
in the motor supply line
Recirculation of humid discharge air Contact MITA’s technical department
Intake of hot air from other sources Contact MITA’s technical department
From observation of the rain-zone/water
falling into the basin it is apparent that not
all the spray-nozzles are working uniformly
or without obstructions. Clean or replace the nozzles.
Lack of cooling with a
consequent increase of the
water temperatures
Fouled or scaled fill pack (heat exchange
surface) Replace the fill pack (heat exchange surface)
Off-axis rotation of one or more fans Contact MITA’s technical department
Wearing of the motor bearings, interference
between fan blade and cylinder Replace the noisy bearing(s)
Anomalous tightening of the fixing screws
of the protective screen Cut-off the electrical supply to the motor-fan set and check the tightness of
the fixing screws
Vibrations and/or noise
Breakage or imbalance of the fan blades Replace the blades/perform static and dynamic balancing of the fan
Basin water level below the minimum Check make-up water supply
Check on the minimum level assured by the float
Hydrometer reading oscillating
or jerky
Supply pump not operating correctly Replace the pump