wtw 115 VAC, Operating Manual

Page: 25 / 32

Cleaning Air Box What to do if...
ba75731e04 12/2013
7 - 1
7 What to do if...
Pump does not
work
Cleaning is
stopped
prematurely
Imperfect
cleaning result
Cause Remedy
– Loose cable – Check wiring
– Cleaning relay does not switch – Check/correct the settings of the
measuring system
– With heavy frost: Formation of ice in
the pump
– Warm up the Cleaning Air Box
– For future operation, lower the
ratio between stoppage and
cleaning duration
(see section
4.2
)
Cause Remedy
– Excessive heat. Temperature fuse
has interrupted the circuit
(T>70 °C).
– Let the Cleaning Air Box cool
down. The temperature fuse
restores the circuit again automat-
ically.
– In the case of frequent failure,
shade the Cleaning Air Box better
or increase the ratio between stop-
page and cleaning duration for
future operation.
Cause Remedy
– Water column in compressed air
hose
– Check the hose system for leaki-
ness and seal it
– Reduce the depth of immersion of
the sensor
– If necessary, install a check valve
(see section
3.6
).
– Dirt at the cleaning nozzles and in
the compressed air line
– Clean the cleaning nozzles and
compressed air line
– Install a check valve, especially
with great depths of immersion
(see section
3.6
).
– Intake air filter dirty – Replace intake air filter
– With heavy frost: Formation of ice in
the compressed air line
– Deice the compressed air line
– For future operation, lower the
ratio between stoppage and
cleaning duration
(see section
4.2
)