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MKF / MKFT (E5) 06/2020 page 119/176
17.1.1.3 Manual fresh water supply via internal freshwater can (MKF/MKFT 115, 240, 720)
With this type of supply, the humidity system is functional only if the water can is sufficiently filled. Check
the filling level daily. The water reserve in the water can is sufficient for a period, which may last between
one and several days, depending on the humidity demand (entered humidity set-point and number of
door openings). Fill the can up to the maximum level mark only. The cover of the water inlet valve must
be screwed on the freshwater connection “IN” (15) (chap. 4.2.3).
17.1.2 Wastewater
The condensation water from the interior and, with MKF/MKFT 115, 240, 720, excess freshwater in the
can (by manual excess filling or in case of fault) is collected in an internal can with a volume of approx.
1.5 liters. It is pumped off via the wastewater pipe.
Dehumidifying system
When the humidity system is activated, the chamber dehumidifies as needed in order to reach the en-
tered humidity set-point inside the Control range of temperature and relative humidity (Figure 19).
Dehumidification occurs in case of need by means of a defined dew point undershoot of several evapora-
tors of the refrigeration system. The condensate which forms is carried away as wastewater.
With temperature set-points outside the control range (hatched area in Figure 19), humidification and
dehumidification are automatically turned off. If the humidity system is turned off while there are descend-
ing temperature curves, then operation of the refrigeration system may cause dehumidification of the
charging material.
With humidity set-points outside the control range (hatched area in Figure 19), or with entry of set-point
0 % r.h., the humidification and dehumidification system is turned off even if the humidity system is acti-
vated.
For error indications concerning water supply and humidity system, see chap.11.1.3 and 23.3
18. Defrosting at refrigerating operation
BINDER alternating climate chambers are very diffusion-proof. To ensure high temperature precision
there is no automatic cyclic defrosting device. 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 20 °C /
68 °F:
The air defrosts the ice cover automatically. Defrosting is continually performed.
Operation with temperature set-points below +5 °C / 41 °F or in the discontinuous range (chap.
17):
The evaporator can cover with ice. 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 60 °C / 140 °F (Manual Mode).
• Let the chamber operate for approx. 1 hour with the door closed.
Too much ice on the evaporator is noticeable by reduced refrigerating performance.
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