BINDER KMF 115 - Manual (Page 69)

KMF (E5.3) 07/2014 page 69/98
13. 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 > +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 < +5 °C / 41 °F:
Icing on the evaporator is possible. Defrost the unit manually.
With temperature set-points < +5 °C / 41 °F, regularly defrost the unit manually:
•
Set the humidity to 0 % r.H. and turn on the humidifying system at humidity switch (3).
• Set the temperature to 40 °C / 104 °F (Manual Mode).
• Let the unit operate for about 30 minutes with the door closed.
Too much ice on the evaporator is noticeable by reduced refrigerating performance.
When turning off the unit following prolonged refrigerating operation below +5 °C / 41 °F, there is danger
of overflowing due to uncontrolled defrosting of icing on the evaporator.
CAUTION
Uncontrolled defrosting of icing on the evaporator.
Danger of overflowing.
After several days of refrigerating operation below +5 °C / 41 °F:
∅
Do NOT directly turn off the unit.
 Manually defrost the unit (see description above).
 Then, shut down the unit at the main power switch (2) and close the tap of the water
supply. Keep removed the access port plugs.
Operation with temperature set-points below 0°C / 32 °F:
While operating the chamber with set-points below < 0°C / 32 °F condensation is possible at the inner
surface of the door around the door gasket.
In case of heavy condensation, check tightness of the door gasket.
After one or two days operation at a set-point < 0°C / 32 °F a thin ice layer can cover the inner unit door ,
the front margins of the inner kettles and may be the glass window.. The amount depends of the ambient
temperature and humidity. This does not influence the proper function of the refrigerating system.
Refrigerating performance decreases while operating the chamber at temperatures < 0°C / 32
°F due to icing of the evaporators. For this reason defrost the chamber regularly, e.g. once a
week.