Munters ML180, User Manual

ML180-MLT350 Dehumidifiers

190TGB-1034-A

2 Installation

15

„

The humidistat must be electrically compatible with the 
dehumidifier’s extra low voltage control circuit.

„

The humidistat must be designed so that the contacts close on a 
rising RH to complete the control circuit and start the dehumidifier.

„

Voltage drops may be experienced when using excessively long 
cables.

At operation, the voltage must be 24VAC measured at the dedicated 
terminals, used for connecting the humidistat to the dehumidifier. If 
the measured voltage is less than 20VAC, a separate relay controlled by 
the humdistat must be used.

2.13 Pre-Start settings

ML180-MLT350 units are equipped with a number of standard features 
requiring a few selections and settings before the unit is put in 
operation for the first time.
Some features require connection of external equipment. For wiring 
details refer to the 

Circuit Diagram Supplement

 supplied with this unit.

2.13.1 One-step humidistat

NOTE!

Where no humidistat is connected to the unit, the dehumidifier will be operating 
at maximum output for as long as the unit is switched on.

Where a one-step humidistat is fitted, the dehumidifier will switch on 
and off under the control of the humidistat. The one-step humidistat is 
connected in accordance with the 

Circuit Diagram Supplement

.

2.14 Pre-Start Checks

Before starting the dehumidifier for the first time, ensure that the 
mains power supply is isolated from the dehumidifier and carry-out the 
following checks:

1. Check that the Mode switch on the dehumidifier is in the “OFF” 

position, 

see figure 3-1, Control Panel

.

2. Check the air intake filters for damage and proper fixation and also 

check that all areas inside the unit are clean.

3. Visually inspect all ducting and duct connections to make sure that 

all connections have been correctly installed and that there are no 
signs of damage to the system. Also check that all ducts are free from 
obstacles blocking the air passage.

4. Remove the top panel and check that none of the main contact 

breakers in the electrical control panel have been tripped. For 
details refer to the wiring diagrams provided with the unit.

5. Check that the incoming power supply voltage is correct and that 

the cables are correctly connected.

6. If a humidistat has been installed, check that it has been correctly 

positioned in the room and has been correctly connected to the 
unit

, 

see section 2.12, External Humidistat

.