2.4 Configurationfeatures
This chapter includes infor mation about functions and components that can be added w hen ordering a
MX² dehumidifier. At delivery, each unit is configured according to the configuration sheet supplied with
the user manual.
2.4.1 Insulatedprocessairinlet
All dehumidifier units supplied with pre-cooled process air 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 .
2.4.2 Processfancontrol
The process fan is equip
ped with a frequency converter for controlling the fan s peed. T he process fan
control can be configur
ed as fixed 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 speed
The frequency conve
rter 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.
8
Dehumidifierdesign
190TEN–106 5–J 1408
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