Dehumidifier ML420-MLT1400
4.6 Precautionary measures for units with LI desiccant rotor
The standard delivery is Munters high performance desiccant rotor HPS (High Performance Silica gel).
If the dehumidifier is delivered with an LI rotor (lithium chloride) it is important that the rotor does not
become loaded with moisture when the dehumidifier is off.
NOTE!
Make sure that no air passing through the rotor has a relative humidity greater than 80%.
It is recommended to install closing dampers in the process and reactivation air inlets to avoid that air with
high relative humidity is drawn through the rotor and into the room.
This is particularly important when the process air is drawn from outdoors, or when the system has been
fitted with a pre-cooler.
4.7 Electrical connections
W
W
WARNING!
ARNING!
ARNING!
All electrical equipment connections must be carried out in accordance with local regulations and by qualified
personnel. Risk of electrical shock.
W
W
WARNING!
ARNING!
ARNING!
The unit must never be connected to a voltage or frequency other than that for which it was designed. Refer to the
unit identification plate.
Each unit is supplied complete with all the internal wiring installed and configured in accordance with the
specified voltage and frequency on the identification plate.
NOTE!
The supply voltage must not differ from the specified operating voltage by more than +/- 10%.
For connection details, see the identification plate and the wiring diagram or section
.
4.8 External humidity sensor
ML-series dehumidifiers are wired so that when the unit is set to
AUTO
matic, it can be controlled from
an externally mounted humidity sensor.
All models have a two-stage heater, and can be controlled by a two-stage humidity sensor. This method is
more efficient and allows for more accurate dehumidification control.
The electrical connections are made at terminals in the electrical control panel. For wiring and connection
details, see the wiring diagram.
NOTE!
Where no humidity sensor is connected to the unit, the dehumidifier will be operating at maximum output
for as long as the unit is switched on.
A room humidity sensor is to be mounted 1-1.5 m above the floor. It must be positioned so that it is not
directly exposed to dry air from the unit or to humid air flowing in through opening doors. Position it away
from heat sources and direct sunlight.
■
The humidity sensor connecting cable should have a conductor area of not less than
0,75 mm
2
and must have an insulation resistance rating in excess of 500 VAC.
■
The humidity sensor must be designed so that the contacts close on a rising RH to complete the control
circuit and start the dehumidifier.
190TGB-1035-H1604
Installation
13
