2.5 Configurationfeatures
This chapter includes infor mation about functions and components that can be added w hen ordering an
MX² dehumidifier.
2.5.1 Insulatedprocessairinlet
All dehumidifier units supplied with pre-cooled process air should have insulated process air inlet. The
process air sector in front of the rotor has an internal lining of isolation to prevent condensation on the unit.
2.5.2 Processfancontrol
The process fan is equippe
d with a frequency converter for controlling the f an speed. The process fan
control can be configure
dasfixed speed or variable speed according to below:
Fixed speed
The frequency conve rter for the process fan is pre-set at t he factory and the process fan always runs with a
constant speed that gives the rated process airflow.
Variable sp eed
The frequency conver
ter for the process fan is controlled either by flow or pressure.
At flow control, a pressure sensor measures the pressure difference over the inlet cone on the process fan. At
pressure control, a pressure sensor measures the air pressure in the dry air duct.
Th e a ctual value from the pressure sensor is calcula ted, tog e the r with the fan coefficient, by the PLC in the
control system. The PLC compares the actual value w ith the set point value and changes the command
signal to the frequency converter if there is a difference b etween the values.
190TEN–108 9–G1412
Dehumidifierdesign
13
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