(©January, 2008)
Air Technology Systems, Inc.
BNB Ultrasonic Humidifier Installation, Operation & Maintenance Manual
5-6
Failure
Cause
Checking
Remedy
No mist is
generated.
Water supply
control system
Water supply float
switch (FS1) is faulty.
If there is no continu-
ity, replace the switch.
‡
Water supply float
switch arm sticking.
Drain the water tank,
remove the printed circuit
board terminal (FS1) and
test the continuity of the
float switch.
Water supply
solenoid valve is
faulty.
No water supply is provided
even if the water tank is
drained and voltage of the
SV terminal on the printed
circuit board is 48VAC.
Replace the
solenoid valve.
Oscillation control
system.
With the water tank filled
with water, remove the
wire from terminal (FS2)
on the printed wiring
board and check conti-
nuity of float switch.
If no continuity exists,
replace the switch.
Float switch for low
water level is faulty.
‡
Float switch for low
water level is sticking.
Other
‡
Water supply float
switch arm sticking.
Correct.
If the water level in the tank
is up to the overflow pipe,
remove the wire from
terminal (FS1) on the
printed circuit board and
ensure there is no continu-
ity on the float switch.
Amount of mist
is too low.
Water supply float
switch is faulty.
Water supply
system overflow-
ing.
Water supply
solenoid valve is
faulty.
Overflowing occurs even
after power is turned off.
4) Consumable parts
Fan lead wires are
loose or disconnected
from the terminals.
Clean the switch. If
operation is not re-
stored, replace switch.
Open the electrical
section and check the
lead wire connecting
terminals.
Replace the
solenoid valve.
If there is continuity,
replace the switch.
Remarks:
If the humidifier is operated for a long time with a deteriorated transducer, the nebulizer print plate may fail. The transduc-
ers should be replaced using the estimated lifetime of 10,000 to 15,000 hours as the point of reference.
If the cause cannot be located through the above checking, please contact
SATS Product Support Group.
If the humidification system is supplied with a water conductivity meter control (optional), ensure the meter is operating
properly and that the supply water is within the recommended guidelines for mineral content.
3) If the cause cannot be located through the above checking, parts may faulty. Check the
interior of the humidifier.
Clean the switch. If
operation is not re-
stored, replace switch.
Clean the switch. If
operation is not re-
stored, replace switch.
The life is about 10,000 to
15,000 hours of humidifier
operation.
No mist output,
or mist output is
too low.
Deterioration of transducer due to
aging.
Replace the transducer.
Failure
Cause
Checking
Remedy