OPERATION AND OPERATOR CONTROL
Page 23 of 32
Automatic defrosting:
During dehumidification ice may build up on the evaporator. The volume of ice
depends on the ambient conditions in the room to be dehumidified.
The series AD 420 / 430 air dehumidifiers are equipped with an automatic hot-
gas defrosting system. Depending on the extent of ice build-up, the air
dehumidifiers will automatically be defrosted on demand according to the
following principle:
A temperature sensor monitors the status in a critical area of the evaporator.
It transmits the defrost signal to the DryLogic electronics which will determine
the defrosting demand and automatically start the defrost cycle. During the
defrost cycle the compressor continues to run whereas the fan is stationary.
After defrosting the air dehumidifier resumes work in the standard
dehumidification mode.
For living space, climate conditions of 20 – 25 °C and 50 – 60% r. h.
are recommended.
For quick building drying the hygrostat is set to continuous
operation (item
I
).
For drying and keeping rooms with wood furnishing (e.g. parquet
flooring) or paintings, antiques etc. dry, a minimum moisture
of 55 – 60% must be observed.
In case of doubt please contact your technical advisor.
