(©January, 2008)
Air Technology Systems, Inc.
BNB Ultrasonic Humidifier Installation, Operation & Maintenance Manual
5-5
Failure
Cause
Checking
Remedy
No mist is
generated.
Power supply
system
Power source switch
(circuit breaker) turned off.
Visually check switch
position.
Turn switch on.
No power supply to the
transformer.
Measure the voltage at
transformer input termi-
nals.
Supply power.
Faulty transformer.
Replace the
transformer.
Water supply system
Water supply valve is
closed.
Open the valve
Check opening/closing of
the valve.
Other
Thermo protector switch
(TP) tripped due to
overheating.
Check if ambient tempera-
ture and water temperature
are within specified range.
Correct.
Check voltage at transformer
input and output terminals.
Amount of mist is
too low.
Supply voltage is low.
Correct the
voltage.
Power supply system
Operating water level is
high and overflowing.
Water supply control
system
Visually check.
See 3) on next
page.
Humidifier is not level.
Other
Visually check.
Correct.
Pull out the filter and
visually check.
Clean the filter.
Check the screw for
adjusting air volume.
Adjust.
Screw for adjusting air
volume is loosened.
‡Air filter clogging.
2) If the cause can not be located through the above checking, remove the mist guide cover
and air flow guide and check the interior of the water tank.
5.3 Troubleshooting and Repair
Should any failure occur, make the necessary repairs referring to the following table. As a rule, power must be
turned off when troubleshooting is performed but if it is absolutely necessary to troubleshoot when power is
supplied, special attention must be paid to avoid electric shock and short-circuiting.
1) First the humidifier and its surrounding area should be checked.
Mist supply is
coarse.
Power supply system
Supply voltage is high.
Check voltage at trans-
former input and output
terminals.
Fine tune the mist
quality with the
voltage and/or air
volume adjusting
screws.
Measure the voltage at
transformer input and
output terminals.
Remarks:
The causes of failures marked ‡ can be prevented through periodic maintenance/inspection. See Section 5.1, “Periodic
General Maintenance”.
Visually check the
interior of the
water tank.
No mist is
generated.
‡ Dust and foreign material are accumulated in
the water tank.
Clean the interior of the water
tank.
‡ Dust and foreign material are accumulated in
the water tank.
Failure
Cause
Checking
Remedy
Clean interior of water tank and
replace the transducer.
Amount of mist is
too low.
‡ Scale deposited on transducer surface.
