User’s Manual ML/MLT 180-350 Desiccant Dehumidifier ML180-MLT350 Effective for units manufactured from week 46, 2002 190TGB-1034 © Munters Europe AB 2002
ML180-MLT350 Dehumidifiers Contents Important user information .............................4 5 Fault Finding 5.1 5.2 5.3 5.4 1 Introduction 1.1 1.2 1.3 1.4 1.5 1.6 General ..........................................................5 About this manual ..........................................5 Safety and Cautions ......................................5 Markings ........................................................6 Operator stations ...........................................6 Fault indications .....
ML180-MLT350 Dehumidifiers Important user information Intended use of equipment Safety Munters dehumidifiers are intended to be used for the dehumidification of air. All other uses of the equipment, or use which is contrary to the instructions given in this manual, can cause personal injury and/or machine damage. In this publication hazardous activities are indicated and preceded by the common hazard symbol.
ML180-MLT350 Dehumidifiers 1 Introduction 1.1 General Munters dehumidifiers are designed to efficiently dehumidify air. Munters has a wide range of dehumidifiers that have design parameters applicable for different usages and applications. Please contact your nearest Munters office if you have any doubt or questions regarding the actual installation. For product data information, see chapter 6, Product Design Information. 1.
ML180-MLT350 Dehumidifiers 1.4 Markings 1 2 3 5 6 4 6 (GB)CHANGE FILTER (GB)CHANGE FILTER Figure 1-1. Location of labels 1 3 2 Type ML420 Fabr. No 0214 190XXX XXXXX 3 ~ 400V 50Hz M Max 370W 42.kW 4,57kW IP44 5 4 6 Munters Europe AB 1 = Identification Plate 3 = Wet Air Outlet 5 = React Air Inlet 2 = Dry Air Outlet 4 = Process Air Inlet 6 = ML180-MLT350 Filter (GB) CHANGE FILTER (SW) BYT FILTER (FR) REMPLACER LE FILTER (DE) FILTER AUSWECHSELN Figure 1-2.
ML180-MLT350 Dehumidifiers 2 Installation 2.1 General The ML Dehumidifiers intended for indoor installation. The unit is inspected and checked prior to leaving the factory to guarantee consistent quality and maximum reliability. If the unit is to be put into storage, prior to installation, see section 2.5, Storing the Equipment. 2.2 Safety WARNING! The dehumidifier is heavy and can weigh in excess of 50kg. To avoid accidents use only approved lifting equipment.
ML180-MLT350 Dehumidifiers 2.3 Moving the Equipment WARNING! The dehumidifier is heavy and can weigh in excess of 50kg. To avoid accidents use only approved lifting equipment. The dehumidifier is delivered on a pallet and must be handled carefully. All panel doors of the unit must be closed during transport. Provided that the dehumidifier is still secured to its delivery pallet, it can be moved using a fork-lift truck.
ML180-MLT350 Dehumidifiers 2.6 Location Requirements The dehumidifier is intended for indoor installation. It is important that the intended installation site meets the location and space requirements for the equipment in order to achieve the best possible performance and trouble-free operation. The unit should be placed in an upright level position inside or outside the space to be dehumidified. For unit and service dimensions, see section 6.3, Dimensions and service space.
ML180-MLT350 Dehumidifiers 2.8 Ducting 2.8.1 General recommendations The connections for process and reactivation air are designed in accordance with the recommendations in ISO 7807. The rectangular duct connections contain tapped inserts for M8 bolt fixings. CAUTION! The dehumidifier has been designed to operate at specific process airflows (corresponding to the fan sizes installed) and must not be directly connected to air-conditioning systems.
ML180-MLT350 Dehumidifiers • The total resistance in the process and reactivation air ductwork must not exceed the performance rating of the fans fitted in the dehumidifier. For details of minimum available static pressure, see section 6.5, Technical Specifications. Vertical Wet Air Outlet Horizontal Wet Air Outlet Downward slope away from dehumidifier Wet Air Wet Air Wire netting, mesh width about 10 mm Wire netting, mesh width about 10 mm To Condensate Drain Figure 2-3. Wet air outlet design 2.8.
ML180-MLT350 Dehumidifiers Rectangular Duct Wire netting, mesh width about 10mm Round Duct Wire netting, mesh width about 10mm Figure 2-4. Outdoor air inlet design 5 B 1 C 4 5 A = = = = Process air inlet Dry air outlet Reactivation air inlet Wet air outlet 1 2 3 4 5 = = = = = Dry air damper External filter box (option) Duct transition Reactivation air damper Outlet duct (wire netting) 420 2 A B C D ML Munters D 3 Figure 2-5. Required ductwork 2.
ML180-MLT350 Dehumidifiers 2.10 Installation Examples The closed airflow system is mainly used where the room to be dehumidified contains little or no ventilation, and is partially sealed. 420 2.10.1 Closed System ML Munters 420 A closed airflow system offers the advantage of simple design and therefore low installation costs.
ML180-MLT350 Dehumidifiers 2.11 Electrical Connections 2.11.1 Mains Supply WARNING! All electrical equipment connections must be carried out in accordance with local regulations and by qualified personnel. WARNING! The unit must never be connected to a voltage or frequency other than that for which it was designed and manufactured. Refer to the unit identification plate if in doubt. ML180 & MLT350 dehumidifiers are supplied complete with a prewired mains cable.
ML180-MLT350 Dehumidifiers 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.
ML180-MLT350 Dehumidifiers 7. The ML270 has a 3 phase fan motor and the rotation direction of the fan impeller must be checked after connection to the power supply. Open the front panel of the dehumidifier and take out the process filter. Start the dehumidifier and check that the fan impeller is rotating. Stop the dehumidifier and observe the impeller just before it stops rotating to check that the rotation direction is clockwise. 8.
ML180-MLT350 Dehumidifiers 4. If the temperature differential is out of tolerance limit by 5%, adjust the reactivation air damper in small stages allowing the temperature display to stabilise after each adjustment) until reactivation temperature reading is within the specified tolerances. .
ML180-MLT350 Dehumidifiers 3 Operation 3.1 General The ML180-MLT350 dehumidifiers are equipped with a control panel that contains mode switches and LED indicators. The mode switch of the control panel has two operating modes: MAN (Manual mode) The dehumidifiers fan, rotor and reactivation heater operate continuously with full capacity. AUT (Automatic mode) The dehumidifiers fan, rotor and reactivation heater operate when the Relative Humidity rises above the desired value. 3.
ML180-MLT350 Dehumidifiers 5. Operate the run/stop switch to the position and check that the unit stops and that the unit running indicator goes out. For details on the Control panel, see figure 3-1, Control Panel. 3.5.2 Automatic Mode - Humidistat For the unit to operate in the AUTOmatic mode a one-step humidistat must be installed and correctly connected to the unit. For details see section 2.12, External Humidistat. 1. Set the mode switch to the AUTO position. 2.
ML180-MLT350 Dehumidifiers 5. Operate the run/stop switch to the position and check that the unit stops and that the unit running indicator goes out. 6. Reset the RH98 to the desired set-point. For details on the Control panel, see figure 3-1, Control Panel. 3.6 Control Panel 1 2 3 4 5 6 Figure 3-1. Control Panel Item 1 Switch/Indicator Run/Stop Switch Function With the run/stop switch selected to the position, the unit is switched off.
ML180-MLT350 Dehumidifiers 4 Maintenance 4.1 General Munters dehumidifiers are designed for long, continuous operation with minimum attention. Under normal operating conditions, requirements for maintenance are minimal. Maintenance interval lengths are primarily determined by operating conditions and the environment in which the unit is installed. When in doubt, consult Munters’ product service department. See addresses for Munters representatives on the back cover of this manual. 4.
ML180-MLT350 Dehumidifiers Inspection/Maintenance Procedure Component 3-6 Months 12 Months Process and reactivation filter Clean filter housing and change filter if dirty. Dehumidifier housing Check for physical damage and clean unit Check for physical damage and clean unit externally and internally as necessary. externally and internally as necessary. Process and reactivation fans Check for physical damage and clean the Remove all dirt and dust in the motor cooling fan motor housing as required.
ML180-MLT350 Dehumidifiers 5 Fault Finding 5.1 General The purpose of this chapter is to provide guidance in basic fault finding and provide instructions for corrective actions so as to remedy faults. Wiring diagrams can be provided to assist with fault isolation. 5.2 Safety WARNING! Adjustments, maintenance and repairs may only be carried out by qualified personnel who are aware of the risks involved during the maintenance of equipment containing high electrical voltage and high machine temperatures. 5.
ML180-MLT350 Dehumidifiers Fault Indicators Symptom Unit has stopped Unit has stopped All off Possible cause Power supply failure Check power supply to the unit. Transformer TC18 fuse FU18 failure. Investigate the cause of the fault and rectify. Reset the fuse. No.3 & 4 are Unit switched to AUTOmatic mode by on mistake with no humidistat connected. Humidistat fault (AUTOmatic mode). Unit has stopped Action No.5 & 3 are High temperature cut-out (BT20) has on tripped.
M180-MLT350 Dehumidifiers 6 Product Design Information 6.1 Product Description The ML-Series desiccant dehumidifiers are designed to efficiently dehumidify in low moisture applications. They are equipped with an internally sealed rotor unit. The rotor casing is constructed of durable thermoset plastic and contains isolated sections that provide a precise balance for dehumidification, reactivation, and heat recovery airflows.
M180-MLT350 Dehumidifiers 6.3 Dimensions and service space Scaled and dimensioned AutoCAD drawings are available in Munters’ DryCAD program (can be ordered at the nearest Munters office). X B Y N J N A F 2 ØD 4 C ØE H M 1 420 3 ML Munter s L G P P 1. Process air inlet 2. Dry air outlet 3. Reactivation air inlet 4. Wet air outlet 145 145 110 165 110 Service space area 249 Figure 6-2.
M180-MLT350 Dehumidifiers 6.4 Capacity Diagrams Approximate capacity in kg/h. For detailed information, please contact your nearest Munters office or refer to Munters’ DryCap program. NOTE! The below figures are based on a nominal (1/1) airflow. 5.0 5.0 ML270 ML180 4.0 4.0 3.0 3.0 2.0 80% RH 60% RH 40% RH 2.0 80% RH 60% RH 40% RH 1.0 5 10 15 20 1.0 25 5 10 15 20 25 1. Process air temperature, °C 2. Process air relative humidity, %RH 3.
M180-MLT350 Dehumidifiers 6.5 Technical Specifications Model ML180 ML270 MLT350 Process Air Rated Airflow (m3/s) Rated Airflow (m3/h) Min. available static pressure (Pa)2 Fan Motor power (kW) at 50Hz3 Fan motor power (kW) at 60Hz3 0,05 180 200 0,25 0,25 0,075 270 200 0,36 0,36 0,097 350 200 0,25 0,25 Reactivation Air1 Rated Airflow (m3/s) Rated Airflow (m3/h) Min.
M180-MLT350 Dehumidifiers 6.6 Unit’s main components 17 12 13 15 16 9 7 6 11 14 8 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Fan Motor Process Impeller Reactivation Impeller Process Filter Reactivation Filter Rotor Rotor Cover Upper Rotor Cover Lower Rotor, Sealing Ring Roller, Belt Guide Drive Belt Reactivation Heater Drive motor Pulley, Belt Drive Switch (rocker, 2-pole) Temperature Indicator Electrical Control Panel 5 3 1 2 4 Figure 6-4.
ML180-MLT350 Dehumidifiers 7 Appendix 1- Options 7.1 General ML180-MLT350 dehumidifiers have been designed to ensure that options can be incorporated with the minimum external physical alteration. For connections details refer to the Circuit Diagram Supplement provided with the unit. NOTE! Voltage drops may be experienced when using excessively long cables. At operation the voltage must be 24V measured at the connection point (dehumidifier) for ALL external humidistat and remote switch connections.
ML180-MLT350 Dehumidifiers The push buttons have the following main functions: SET Display/change the required value and reset alarm Increase value Decrease value % RH Display position of control steps for reactivation heater ( 0=off; 1=on). During normal operation and in any position of the mode switch the current relative air humidity is displayed. 7.4.2 Display / change setpoint of relative humidity 1. Press/release SET button.
ML180-MLT350 Dehumidifiers Parameter 1 2 Description Possible parameter selection Factory setting 05 Correction of the humidity transmitter’s read-off value 0 %RH No settings 10 11 12 13 OFF/ON interval, stage1 Offset stage 1 OFF/ON interval, stage 2 Offset stage 2 1-15 %RH -15- +15 %RH 1-15 %RH -15- +15 %RH 2 %RH1 -1 %RH 6 %RH2 -1 %RH 14 15 OFF/ON interval alarm output Offset from set point, alarm output 1-15 %RH -15- +15 %RH 1%RH 0 %RH 30 36 37 Reset alarm when the cause of alarm is re
ML180-MLT350 Dehumidifiers Acknowledge alarms Acknowledge the alarm by pressing SET on the operator panel. The display now starts to flash showing the alarm message and the current relative air humidity alternately. The function of the reset depends on the settings of parameters, see table 7-1. Sensor calibration The humidity transmitterís read off value can be calibrated with the Operator Panel’s Sensor Offset (parameter 05, see table 7-1.) e.g. 3 %RH too much, the offset needs to be decreased with 3%.
ML180-MLT350 Dehumidifiers 34 7 Appendix 1- Options 190TGB-1034-A
ARGENTINA Munters Argentina BUENOS AIRES Tel: +54 (0)11 4902 1874 Fax: +54 (0)11 4902 1823 CANADA Munters Inc.
