Specifications

54 PROGRAMMING MANUAL 516307 C PUBLICATION DATE 31 JAN 2008.DOC
9.9. HUMIDITY CONTROL - TROUBLE SHOOTING
The analogue value humidity sensor can be watched while drying the linen.
This can be helpful for diagnostic purposes.
While dryer is running, key switch in Program mode, press High Temperature Button and the
analogue value humidity sensor is shown for 2 seconds.
ATTENTION
THE HUMIDITY CONTROL SYSTEM IS NOT MADE TO RUN WITHOUT LOAD OR WITH A VERY
SMALL LOAD. THE SYSTEM CAN ONLY FUNCTION IN A NORMAL WAY WHEN THERE IS
SUFFICIANT EVAPORATION TO BE MEASURED BY THE AIR HUMIDITY SENSOR. CHECK
CORRECT DRYER OPERATION WITH A NORMAL AMOUNT OF WET LINEN.
Trouble shooting problems with Humidity Control :
T Check dust filter cap
When humidty control doesn't work at all, probably the dust filter cap is missing.
The dust filter cap is a white cover that must not be removed from the sensor device.
Nevertheless it doesn't look in this way, the dust filter cap allows to pass the air.
T Check door lock system
When the dryer door is not completely closed, air from the room is sucked in the dryer.
This causes a wrong air humidity measurement.
Make sure that the dryer can only run when the door is in it's closed (locked) position.
(When door is still 10 mm open, it should not be possible to start a dryer program.)
T Check heating and air flow
The air humidity measurement can only function when there is sufficient water evaporation
from the linen.
Evaporation can only happen when the air and indirectly the linen is sufficiently heated.
Suppose that the dryer has to run with reduced heating power, the air flow must be sufficiently
reduced so that there is still evaporation.
Example:
There is not sufficient Electrical Current available at the building.
The dryer works with only 50% of it's electrical heating power.
The air flow must be sufficiently reduced so that there is still enough evaporation inside the dryer to
allow optimal humidity control.
T Check final drying temperature
At a normal drying process the outlet air temperature reaches it's programmed target value when the
linen gets dry.
For a correct drying process : when humidity control stops the dryer the dryer must have reached,
before the end of the drying cycle, the programmed target temperature value.
If this is not the case, probably there will not have occured sufficient evaporation at the drying
process because of reduced heating power. And the air humidity measurement will not have been
accurate to allow optimal humidity control.
T Linen must be sorted
A mixture of linen in the dryer can not result in an equal drying result.
It is a good practice that the same kind of linen is sorted and dryed together.
* Coton
* Synthetic
!