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KBF-S / KBF-S-UL (E6) 02/2019 page 60/91
The humidity system is functional only if the water can is sufficiently filled. Check the filling level daily. The
water reserve in the can is sufficient for a period, which may last between one and several days, depend-
ing on the humidity demand (entered humidity set-point and number of door openings).
Wastewater / condensate
The condensation water from the interior is led into the condensate collection pan. For its installation see
chap. 4.2.1.
Dehumidifying system
When the humidity system is activated, the chamber dehumidifies as needed in order to reach the entered
humidity set-point inside the control range of temperature and relative humidity (Figure 19).
Dehumidification occurs in case of need by means of defined dew point undershoot by the evaporator of
the refrigeration system. The condensate which forms is carried away as wastewater.
If the humidity system is turned off while there are descending temperature curves, then operation of the
refrigeration system may cause dehumidification of the charging material.
For error indications concerning water supply and humidity system, see chap. 13.1 and 23.
19. Defrosting at refrigerating operation
BINDER constant climate chambers are very diffusion-proof. To ensure high temperature precision there
is no automatic cyclic defrosting device. The DCT™ refrigerating system largely avoids icing of the evapo-
ration plates. However, at very low temperatures the moisture in the air can condense on the evaporator
plates leading to icing.
Always close the door properly.
Operation with temperature set-points above +5 °C / 41 °F at an ambient temperature of 25 °C /
77 °F:
The air defrosts the ice cover automatically. Defrosting is continually performed.
Operation with temperature set-points below +5 °C / 41 °F:
Icing on the evaporator is possible. Defrost the chamber manually.
With temperature set-points below +5 °C / 41 °F, regularly defrost the chamber manually:
• Set the humidity to 0 % r.h. The humidity system must be activated.
• Set the temperature to 40 °C / 104 °F.
• Let the chamber operate for about 30 minutes with the door closed.
Too much ice on the evaporator is noticeable by reduced refrigerating performance.
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