Munters ML420-1350, MLT800-1400 User manual
ENGLISH
Dehumidifier ML420-1350,
MLT800-1400
User manual
T-ML2-A1904
Copyright © 2019 Munters Europe AB
Original instructions
Valid for units produced from April 2019.
IMPORTANT
Read these instructions before using the product.
Dehumidifier ML420-1350, MLT800-1400
Table of Contents
1. Important user information .................................................................................................. 5
1.1. Intended use ........................................................................................................... 5
1.2. Warranty ................................................................................................................. 5
1.3. Safety information ................................................................................................... 5
1.4. Copyright ................................................................................................................ 6
2. Introduction ....................................................................................................................... 7
2.1. About this manual ................................................................................................... 7
2.2. Unintended use ....................................................................................................... 7
2.3. Safety ..................................................................................................................... 7
2.4. Marking .................................................................................................................. 9
3. Dehumidifier design ......................................................................................................... 10
3.1. Product description ................................................................................................ 10
3.2. Function overview ................................................................................................. 10
3.3. Main components .................................................................................................. 11
3.4. Insulated process air inlet ...................................................................................... 11
4. Transport, delivery inspection and storage ......................................................................... 12
4.1. Transport .............................................................................................................. 12
4.2. Delivery inspection ................................................................................................ 12
4.3. Storage ................................................................................................................ 12
5. Installation ....................................................................................................................... 13
5.1. Safety ................................................................................................................... 13
5.2. Installation site requirements .................................................................................. 13
5.3. Foundation ........................................................................................................... 14
5.4. Duct installation ..................................................................................................... 14
5.4.1. General recommendations .......................................................................... 14
5.4.2. Duct for outdoor air inlet .............................................................................. 16
5.4.3. Duct for wet air outlet .................................................................................. 16
5.5. Precautionary measures for units with lithium chloride rotor ..................................... 17
5.6. Electrical installation .............................................................................................. 17
5.7. External humidity sensor ........................................................................................ 18
6. Commissioning ................................................................................................................ 19
6.1. Inspection before first start ..................................................................................... 19
6.2. Function test ......................................................................................................... 20
6.3. Airflow adjustment ................................................................................................. 20
7. Operation ........................................................................................................................ 21
7.1. Main power switch ................................................................................................. 21
7.2. Control system ...................................................................................................... 21
7.3. Start and stop ....................................................................................................... 21
7.3.1. Start/stop from control system panel ............................................................ 22
7.3.2. Start/stop with mode selector ...................................................................... 22
8. Service and maintenance ................................................................................................. 23
8.1. Safety ................................................................................................................... 23
8.2. General ................................................................................................................ 23
8.3. Extended warranty ................................................................................................ 23
8.4. Service alternatives ............................................................................................... 23
8.5. Maintenance schedule ........................................................................................... 24
8.6. Preventive replacements ....................................................................................... 25
8.7. Filter change ......................................................................................................... 25
8.8. Cleaning ............................................................................................................... 25
9. Technical specification ...................................................................................................... 26
9.1. Dimensions and service space ............................................................................... 26
9.2. Capacity diagrams ................................................................................................ 27
9.3. Technical data ....................................................................................................... 29
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Dehumidifier ML420-1350, MLT800-1400
9.4. Sound data ........................................................................................................... 30
9.4.1. Definition ................................................................................................... 30
9.4.2. Sound data ML420 ..................................................................................... 31
9.4.3. Sound data ML690 ..................................................................................... 31
9.4.4. Sound data MLT800 ................................................................................... 32
9.4.5. Sound data ML1100 .................................................................................... 32
9.4.6. Sound data ML1350 ................................................................................... 33
9.4.7. Sound data MLT1400 ................................................................................. 33
10. Disposal ........................................................................................................................ 34
11. Contact Munters ............................................................................................................. 35
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Dehumidifier ML420-1350, MLT800-1400
1. Important user information
1.1. Intended use
Munters dehumidifiers are intended to be used for the dehumidification of air. Any other use of the unit,
or use which is contrary to the instructions given in this manual, can cause personal injury and damage
to the unit and other property.
No modification of the unit is allowed without prior approval by Munters. Installation of additional devices is only allowed after written agreement by Munters.
1.2. Warranty
The warranty is based on the terms of sale and delivery of Munters. The warranty is not valid if repairs
or modifications are carried out without the written agreement of Munters, or if the unit does not operate
under the conditions agreed with Munters.
The warranty is limited to a free exchange of parts or components which have failed as a result of defects in materials or workmanship.
All warranty claims must include proof that the fault has occurred within the warranty period and that the
unit has been used in accordance with the specifications. All claims must specify the unit type and serial
number. This information is stamped on the identification label.
Commissioning/Start-up inspection "S" by Munters is mandatory to validate the full warranty.
It is a condition of the warranty that the unit for the full warranty period is serviced and maintained by a
qualified Munters engineer or Munters approved engineer. The service and maintenance must be documented for the warranty to be valid.
1.3. Safety information
Information about dangers are in this manual indicated by the common hazard symbol:
WARNING
Indicates a possible danger that can lead to personal injury.
CAUTION
Indicates a possible danger that can lead to damage to the unit or other property, or
cause environmental damage.
NOTE
Highlights supplementary information for optimal use of the unit.
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Dehumidifier ML420-1350, MLT800-1400
1.4. Copyright
The contents of this manual can be changed without prior notice.
NOTE
This manual contains information which is protected by copyright laws. It is not allowed
to reproduce or transmit any part of this manual without written consent from Munters.
Munters Europe AB, P.O. Box 1150, SE-16426 KISTA Sweden
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Dehumidifier ML420-1350, MLT800-1400
2. Introduction
2.1. About this manual
This manual is written for the user of the dehumidifier. It contains necessary information for how to install and use the dehumidifier in a safe and efficient way.
Read through the manual before the dehumidifier is installed and used.
Contact your nearest Munters office if you have any questions about the installation or the use of your
dehumidifier.
This manual must be stored in a permanent location close to the dehumidifier.
2.2. Unintended use
The following restrictions on use apply:
• The dehumidifier is not intended for outdoor installation.
• The dehumidifier is not intended for use in classified areas where explosion safety compliant equipment is required.
• The dehumidifier must not be installed near any heat generating devices that can cause damage to
the equipment.
2.3. Safety
The information in this manual shall in no way take precedence over individual responsibilities or local
regulations.
During operation and other work with a machine it is always the responsibility of the individual to consider:
• The safety of all persons concerned.
• The safety of the unit and other property.
• The protection of the environment.
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Dehumidifier ML420-1350, MLT800-1400
WARNING
• All electrical installations must be done by an authorized electrician in accordance
with local regulations. An incorrect installation can cause electrical shock hazards
and damage to the unit.
• Commissioning and initial start-up of the unit must be done by authorized personnel
only.
• The unit must never be connected to another voltage or frequency than what is
specified on the identification plate. Too high line voltage can cause electrical shock
hazards and damage to the unit.
• Rotating fan blades can cause serious injury. Only operate the unit with the air ducts
connected.
• The unit can restart automatically after a power cut. Make sure that the main power
switch is set and locked in the OFF position before any service or maintenance work
starts.
• Use only approved lifting equipment to prevent personal injury and damage to the
unit.
• Move the unit carefully to prevent it from overturning.
• If the rotor is to be cut in pieces, wear a suitable CE marked face mask selected and
fitted in accordance with the applicable safety standards to protect from the dust.
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2.4. Marking
1
3
5
4
2
Fabr. No. 1835 XXXXXX XXXXXX
Munters Europe AB
P.O. Box 1150
164 26 Kista, Sweden
Fabr. year
Made in Sweden
2018
3
2
4
3
5
4
2 3
5
1. Unit identification plate
2. Dry air outlet
3. Wet air outlet
4. Process air inlet
5. Reactivation air inlet
Dehumidifier ML420-1350, MLT800-1400
Example identification plate. The first four digits in the fabrication number indicate year and week
(YYWW) of production for the unit.
Labels:
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Dehumidifier ML420-1350, MLT800-1400
3. Dehumidifier design
3.1. Product description
The desiccant dehumidifiers in the ML series have been developed to effectively dehumidify the air in
environments requiring low air humidity.
The dehumidifier is equipped with an encapsulated rotor unit. The rotor casing is constructed of durable
thermoset plastic and contains isolated sections that provide a precise balance for the dehumidification,
reactivation and heat recovery airflows.
The dehumidifier is manufactured in accordance with uniform European standards and established requirements for CE-marking.
3.2. Function overview
Internal airflows
1. Process air
2. Dry air
3. Reactivation air
4. Wet air
The desiccant rotor is the adsorption dehumidifying component in the unit. The rotor structure is comprised of a large number of small air channels.
The desiccant rotor is made of a composite material that is highly effective in attracting and retaining
water vapour. The rotor is divided in two zones.
The airflow to be dehumidified, process air, passes through the largest zone of the rotor and then
leaves the rotor as dry air. Since the rotor rotates slowly, the incoming air always meets a dry zone on
the rotor, thus creating a continuous dehumidification process.
The airflow used to dry the rotor, reactivation air, is heated. The reactivation air passes through the
rotor in the opposite direction to the process air and leaves the rotor as wet air (warm, moist air).
This principle enables the dehumidifier to work effectively, even at freezing temperatures.
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6
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Dehumidifier ML420-1350, MLT800-1400
3.3. Main components
1. Electrical panel 6. Reactivation heater
2. Process fan 7. Drive motor
3. Reactivation fan 8. Rotor
4. Reactivation air filter 9. Upper rotor cover
5. Process air filter
NOTE
The ML420 unit has only one fan motor that is placed between the process and reactivation impellers.
3.4. Insulated process air inlet
When cold process air is to be dehumidified, often in conjunction with a pre-cooler, condensate will
readily form on the inlet side of the dehumidifier. ML-series dehumidifiers can therefore be supplied in
an IPI version in which the process air fan is encased in a specially insulated box to prevent the formation of condensation.
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