FläktGroup Multi-DENCO User manual

Multi- DENCO
®
OPERATION MANUAL

Table of Contents Multi-DENCO
2FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020
Typecode ..................................................................................... 4
1 Overview of Units and Scope of Supply ................................... 8
1.1 Introduction ................................................................................................ 8
1.2 Model number explained ............................................................................ 8
1.3 Product series overview ............................................................................. 9
1.4 DENCO-OfficeCool .................................................................................. 10
1.5 Scope of supply ....................................................................................... 11
1.6 Accessories and special equipment ......................................................... 11
1.7 Directives and regulations ........................................................................ 11
1.8 References within manual ........................................................................ 11
2 Safety and User Information .................................................... 12
2.1 Availability of the operation manual ......................................................... 12
2.2 Scope of the operation manual ................................................................ 12
2.3 Document format ..................................................................................... 13
2.4 Signs used within this manual .................................................................. 14
2.5 Labelling of safety information ................................................................. 16
2.6 Safety-conscious working ........................................................................ 18
2.7 Proper use ............................................................................................... 20
2.8 Modifications and changes ...................................................................... 20
2.9 Spare parts .............................................................................................. 20
2.10 Disposal ................................................................................................... 21
2.11 Personnel selection and qualification ....................................................... 21
2.12 Noise ........................................................................................................ 21
2.13 Environmental considerations .................................................................. 21
3 Technical Description ............................................................... 22
3.1 Unit description ........................................................................................ 22
3.2 Operating limits ........................................................................................ 23
3.3 Operating modes ..................................................................................... 25
3.4 Operating strategies ................................................................................. 27
3.5 Components ............................................................................................. 29
3.6 Heat rejection systems ............................................................................. 31
4 Shipping and Storage ............................................................... 34
4.1 Delivery .................................................................................................... 34
4.2 Handling ................................................................................................... 34
4.3 Storage .................................................................................................... 35
5 Installation ................................................................................. 36
5.1 Requirements and considerations ........................................................... 36
5.2 Substructures ........................................................................................... 38
5.3 Unit placement ......................................................................................... 40
5.4 Clearance and Access ............................................................................. 45
5.5 Installing enclosed accessories ............................................................... 48
5.6 Installation of outdoor units ...................................................................... 51
5.7 Fan touch protection ................................................................................ 58
5.8 EC Declaration of Conformity .................................................................. 58
6 Medium Connections ................................................................ 60
6.1 Requirements ........................................................................................... 60
6.2 Connecting refrigeration pipework ........................................................... 60
6.3 Refrigerant pipework testing procedures ................................................. 72
6.4 Humidifier water connections (optional) ................................................... 75

Multi-DENCO Table of Contents
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 3
6.5 Connecting condensate drain ................................................................... 76
6.6 Connecting water pipework ...................................................................... 77
7 Electrical Connections ............................................................. 86
7.1 Requirements ........................................................................................... 86
7.2 Connecting mains power supply ............................................................... 87
7.3 Connecting outdoor unit ............................................................................ 90
7.4 Connecting signal cabling ......................................................................... 92
7.5 Customer terminals on C5-12 unit controller ............................................ 94
8 Commissioning ......................................................................... 95
8.1 Requirements ........................................................................................... 95
8.2 Pre-commissioning procedure .................................................................. 96
8.3 Commissioning procedure ...................................................................... 102
8.4 Post-commissioning procedure .............................................................. 113
9 Operation ................................................................................. 114
9.1 Requirements ......................................................................................... 114
9.2 General operation ................................................................................... 114
9.3 Alarms and error messages .................................................................... 116
10 Servicing and Maintenance .................................................... 117
10.1 Maintenance access ............................................................................... 118
10.2 Servicing ................................................................................................. 118
10.3 Refrigerant leak testing ........................................................................... 120
10.4 Compressor care .................................................................................... 120
10.5 Cleaning the heat exchanger of Water Cooled System (Flushing) ......... 120
10.6 Humidifier maintenance (if fitted) ............................................................ 120
10.7 Closing down procedure ......................................................................... 121
10.8 Logbook & EU Regulation ...................................................................... 122
11 Fault Finding and Troubleshooting ....................................... 123
11.1 Common Issues ...................................................................................... 124
11.2 When the Pressure Relief Valve (PRV) Has Discharged ....................... 126
12 Dismantling and Disposal ...................................................... 127
12.1 Dismantling ............................................................................................. 127
12.2 Disposal .................................................................................................. 128
13 Appendix .................................................................................. 129
13.1 Pre-Commissioning Checklist (DQA 880) ............................................... 130
13.2 Pressure Test Certificate (DQA 653) ...................................................... 133
13.3 Multi-DENCO Commissioning Report A-Version .................................... 134
13.4 Multi-DENCO Commissioning Report C-Version .................................... 138
Copyright note
Disclosing, copying, distributing or taking any action in reliance on the contents of this document is strictly prohibited
without express prior consent. Violations entail liability for any damages or other liability arising. All rights in relation to
patents, utility patents or design patents are reserved.

Type code Multi-DENCO
4FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020
Type code
Indoor Unit
Product Range Cooling system Unit size Air flow direction Panel configuration Heat exchanger Compressor control Humidifier Filter Fan Heating Power supply
DDENCO
M Multi-DENCO
AA-Version - AirCool
CC-Version - ChillCool
FF-Version - FreeCool
WW-Version - WaterCool
PP-Version - AtmoCool
XX-Version - SplitCool
010 Size 010
018 Size 018
030 Size 030
045 Size 045
065 Size 065
092 Size 092
130 Size 130
D Downflow
U Upflow
P Front full height panel
F Front air inlet grille panel
L Front low level air discharge panel
S Standard heat exchanger
L Large heat exchanger
C CombiCool
H Heat pump heat exchanger
I Inverter compressor
N Not fitted
S Steam humidifier standard conductivity
L Steam humidifier low conductivity
H Steam humidifier high conductivity
R Remote signal 0-10V
N Not fitted
4 Filter G4 (coarse 65%)
7 Filter F7 (ePM2.5 65%)
W Filter washable G4 (coarse 65%)
P EC plug fan
E Electric heating
T Modulating electric heating
W LPHW with 3-way valve
R Remote signal 0-10 V
N Not fitted
1 3~ 400 V, N, PE, 50 Hz
6 3~ 460 V, N, PE, 60 Hz
7 3~ 400 V, N, PE, 60 Hz
NOTE!
Not all combinations of typecode are possible and some options are limited by
region. This page is for reference only. Due to FläktGroup's continuous improve-
ment policy, details and availability are subject to change at any time. For further
guidance, please contact your local sales office.

Multi-DENCO Typecode
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 5
WaterCool Module
Product Range WaterCool System Version Module Position Unit Size Condenser Type Refrigerant Pressure Relief Water Flow Safety Condensing Control Valve Water Pump Flow Control / Commissioning Expansion Vessel Flushing Water Connections Refrigerant Connection Connection Position Panel Unit Colour Packaging Basestand Supply Refrigerant pre- charge
DDENCO
MMulti-DENCO
WC WaterCool Module
WWater Cooled
PWater Cooled Free Cooling
SAlongside
UUnderfloor
010 Size 010
018 Size 018
030 Size 030
045 Size 045
065 Size 065
092 Size 092
130 Size 130
BBrazed Plate Heat Exchanger
SShell & Tube Heat Exchanger
NNot Fitted
1Single Pressure Relief Valve
NNot Fitted
33-way Valve
22-Way PICV
NNot Fitted
NNot Fitted
PWater Pump
NNot Fitted
DDouble Regulating Valve
22-way PICV
NNot Fitted
EExpansion Vessel
FFlushing Bypass
NNot Fitted
SSolder Connections
BThreaded pipework connections (BSPT)
FFlange Connections PN16
SSolder Connections
BPipework Bottom Entry
LLeft Side Connections
SStandard panels
AAcoustic insulation panels
NNot Fitted
RStandard Colour (White)
OOther unit colour (Special)
NNot Fitted
SStandard packaging (Domestic)
EWooden crate packaging (Export)
NNot Fitted
BStandard Height Basestand (600mm)
CCustom height basestand between 601mm and 750mm
DCustom height basestand between 751mm and 900mm
NUnit without Refrigerant

Typecode Multi-DENCO
6FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020
Outdoor Unit
Product Range Key Outdoor unit Outdoor system Coolant Unit size Fan Refrigerant circuit arrangement Compressor size Power supply Winter kit Heat exchanger coating Compressor soft start Unit colour Packaging Airflow direction Number of outdoor units Deliver external unit Liquid receiver Liquid receiver size
DDENCO
MMulti-DENCO
OU Outdoor unit
CCondenser
DDrycooler
UCondensing unit
HHybrid
WWater / Glycol mixture
MMixture
DR410A
013 013
021 021
026 026
032 032
050 050
075 075
100 100
EEC fan
AAC fan with fan speed controller
FAC fan
1Single circuit
NNot fitted
13~400 V, N, PE, 50 Hz
51~230 V, N, PE, 50 Hz
63~460 V, N, PE, 60 Hz
73~400 V, N, PE, 60 Hz
WWinter kit, - 40 °C ambient
NNot fitted
EEpoxy heat exchanger coating
LLCE heat exchanger coating
NNot fitted
NNot fitted
RStandard
OOther unit colour (special)
SStandard packaging (Domestic)
EWooden crate packaging (Export)
CHorizontal or Vertical Airflow
HHorizontal Airflow Only
VVertical Airflow Only
11 outdoor unit
22 outdoor units
OExternal unit is included in package
NDeliver without external unit
DLiquid receiver with double pressure relief valve
CLiquid receiver with double pressure relief valve and pump-down
NNot fitted
16L
212L
315L
418L
521L
625L
730L
836L
A50L
NNot fitted

Multi-DENCO Type code
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 7
DENCO-OfficeCool
Product Range Cooling system Unit size Air routing Panel configuration Heat exchanger Compressor control Humidifier Filter Fan Heating Power supply
DDenco
MMulti-DENCO
OChilled water OfficeCool
HSplit System OfficeCool
018 Size 018
030 Size 030
045 Size 045
DDownflow
UUpflow
PFront full height panel
SStandard heat exchanger
HHeat pump heat exchanger
NNot fitted
SSteam humidifier standard conductivity
LSteam humidifier low conductivity
HSteam humidifier high conductivity
RRemote Signal 0-10 V
NNot fitted
4Filter G4 (coarse 65%)
7Filter F7 (ePM2.5 65%)
WFilter washable G4 (coarse 65%)
PEC plug fan
EElectric Heating
TModulating Electric Heating
WLPHW with 3-way valve
RRemote Signal 0-10 V
NNot fitted
13~400 V, N, PE, 50 Hz
63~460 V, N, PE, 60 Hz
73~400 V, N, PE, 60 Hz

Overview of Units and Scope of Supply Multi-DENCO
8FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020
1 Overview of Units and Scope of Supply
1.1 Introduction
We would like to thank you for purchasing our products.
Multi-DENCO units are intended and designed for indoor installation for cooling, heat-
ing, humidification, dehumidification and filtering of air at atmospheric pressure. The
units are designed as refrigeration systems and/or chilled water systems and it is pro-
hibited to use our units for any other purposes. The equipment has been designed and
manufactured within a 'Quality Assurance System' within a strict quality controlled envi-
ronment to ensure that it reaches you in perfect condition.
For help, assistance, spares or your local office, please visit the following website for
contact details in your region:
https://www.flaktgroup.com/en/contact-us/
1.2 Model number explained
Each product carries an 'Identification Plate' (sometimes referred to as 'serial plate')
inside the equipment for indoor units. For outdoor units, this is on the external casing.
This identification plate carries information that is important and unique to the unit.
Upon receipt of your equipment it is important to check the 'MODEL NUMBER' (a short-
ened version called 'Model Type Code' is shown on the serial plate) prior to positioning
and installation, to ensure it matches your requirements. Any discrepancies should be
reported immediately to your representative.
Refer to page 4 for the type code of a particular unit. Below shows an example serial
plate for a Multi-DENCO A-Version unit.
PRODUCT RANGE / PROJECT TYPE Multi-DENCO® STANDARD
MODEL TYPE CODE / PED DMA030DPSIN4PN1 CAT. 1
SERIAL NUMBER
CONTRACT NO. / DATE OF BUILD 110196 02 / 2017
OPERATION MAN. / WIRING DIAGRAM PR-2013-0101 110196-101
VOLTAGE / PROTECTION RATING
400V-3PH-50HZ/60HZ+N
IP20
MAX. PRE-FUSE 32 TYPE D
FULL LOAD INPUT 11,4 kW
FULL LOAD CURRENT 29,9 A
COOLING MEDIUM
SOFTWARE VERSION
MWP HIGH PRESSURE SIDE 4,32 MPa
MWP LOW PRESSURE SIDE 4,32 MPa
CHILLED WATER 0,70 MPa
EMPTY WEIGHT 330,00 Kg
NOTE
6WC955
CV3.04.009B/DV4.06.009B
R410A (GWP 2088) & WATER
FIELD CHARGE (kg) CO2e
1015
FläktGroup Czech Republic a.s.
Slovanská 781, 463 12 Liberec XXV - Vesec, Czech Republic
ANY MODIFICATION MAY NOT BE REFLECTED ABOVE
=
( Field Charge (R410A) / 1000 ) x 2088 = CO
2
e
CONTAINS
GREENHOUSE
FLUORINATED
GASES

Multi-DENCO Overview of Units and Scope of Supply
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 9
1.3 Product series overview
There are 6 versions of the Multi-DENCO product: A-Version, C-Version, X-Version,
F-Version, W-Version and P-Version.
Fig. 1-1: A Multi-DENCO Unit
Common features &
options
– 7 standard box sizes (010, 018, 030, 045, 065, 092 and 130)
– Cooling capacities up to 150 kW
– Available with both upflow or downflow air paths
– Large EC plug fans
– Integrated and/or remote temperature and humidity sensors
– Large surface area for heat exchanger coil
– Available with full height panel doors or with door mounted grilles
– Humidification and heating options available
– Standard control software and hardware that is compatible for all versions
– Building Management System (BMS) interface compatible
A-Version – Refrigeration based cooling
– R410A used as standard
– Inverter compressors as standard (fitted in indoor unit)
– Electronic expansion valve as standard (fitted in indoor unit)
– Typically supplied with an outdoor condenser
C-Version – Chilled water based cooling
– Can operate with Glycol
– A method of heat rejection separate to Multi-DENCO unit (e.g. Chiller)
– Can be provided with 3-way, 2-way or 2-way PICV valves and a variety of actuators
X-Version – Refrigeration based cooling
– R410A used as standard
– Available for sizes 010 to 045
– Inverter compressors as standard (fitted in outdoor unit)
– Electronic expansion valve as standard (fitted in outdoor unit)
– Typically supplied with an outdoor condensing unit
F-Version – Two circuits within 1 unit: one FreeCool circuit and one direct expansion circuit.
– Available for sizes 030 to 065
– Energy saving Free-Cooling with additional / backup refrigerant circuit
– R410A used as standard
– Inverter compressors fitted as standard (fitted in indoor unit)
– Electronic expansion valve fitted as standard (fitted in indoor unit)
– EC water pump as standard (fitted in indoor unit).
– (Optional) Hybrid outdoor unit combining condenser and drycooler

Overview of Units and Scope of Supply Multi-DENCO
10 FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020
W-Version – Refrigerant based cooling with water based heat rejection
– A WaterCool module containing a Brazed Plate Heat Exchanger (BPHE)
– R410A used as standard
– Inverter compressors fitted as standard (fitted in indoor unit)
– Electronic expansion valve fitted as standard (fitted in indoor unit)
P-Version – Energy saving Free-Cooling with additional / backup refrigerant circuit into water
based heat rejection
– R410A used as standard
– Available for sizes 030 to 065
– An underfloor WaterCool module containing a Shell & Tube heat exchanger
– Inverter compressors fitted as standard (fitted in indoor unit)
– Electronic expansion valve fitted as standard (fitted in indoor unit)
– FreeCool / WaterCool water pump fitted in the underfloor WaterCool module
– Drycooler for outdoor heat rejection
CombiCool Circuit
(Optional)
The A, C and W-Versions units can be upgraded to have inbuilt redundancy. A unit with
a CombiCool Circuit, consists of a primary and a secondary circuit. The primary circuit
will be a chilled water cooling circuit. When parameters leave the allowable boundaries
(e.g. chilled water inlet temperatures are too high) then the primary circuit will stop and
the secondary circuit will be activated (e.g. for the A-Version: the DX circuit starts)
to continue the cooling process. A CombiCool coil can also be used in a FreeCool strat-
egy.
1.4 DENCO-OfficeCool
DENCO-OfficeCool is a separate version of the Multi-DENCO design and custom-
made for use in an office environment or similar requiring comfort cooling. The units
consist of one Zone unit to many Local Environmental Control Units (LECUs) to give
temperature control through a raised floor.
Typically, DENCO-OfficeCool units are in downflow air configuration, but Upflow units
can be used with a 'top side down duct'. This can be referred to as 'Underfloor Air Con-
ditioning'.
O-Version – Water based cooling
– Can operate with Glycol
– A method of heat rejection separate to Zone unit (e.g. Chiller)
– Can be provided with 3-way or 2-way valves and a variety of actuators
– Available for sizes 018 to 045
– Acoustic insulation and slower fan speeds
H-Version – R410A used as standard
– Available for sizes 018 to 045
– Inverter compressors as standard (fitted in outdoor unit)
– Acoustic insulation and slower fan speeds
– Heat pump options available

Multi-DENCO Overview of Units and Scope of Supply
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 11
1.5 Scope of supply
A typical order of a Multi-DENCO unit could consist of (but is not limited to):
– Indoor unit of Multi-DENCO configuration with associated internal options fitted for
items requiring installation external to the unit, hardware is provided loose within the
unit)
–Outdoor unit / Heat Rejection (Optional) a condenser, condensing unit, drycooler
or watercool module to act as a heat rejection unit for the system
–Unit documentation
– A copy of the current operation manual (indoor and/or outdoor)
– User Controls manual
– Wiring diagrams for both indoor and outdoor units
– Dimensional drawing
– Spare part list in the form of a label or a printed sheet
–Accessories (optional) Any other accessories that may be required for the indoor
or outdoor unit, for example; plinths, base stands, ceiling return sections etc. may
be provided in separate packaging
1.6 Accessories and special equipment
Multi-DENCO units can be designed with a vast number of accessories and features.
To determine the scope of options fitted to your unit, compare the supplied unit 'Model
Number' with the unit model number specified in the typecode.
1.7 Directives and regulations
We certify that products supplied within the range of Multi-DENCO conform to, meet
and/or exceed the requirements of the following directives and regulations:
– Directive on Machinery 2006/42/EC
– Low Voltage Directive (LVD) 2014/35/EU
– Electromagnetic Compatibility (EMC) 2014/30/EU
– Pressure Equipment Directive 2014/68/EU
1.8 References within manual
The following references to standards and regulations are made within this manual.
These may be updated or revised by their relevant bodies, after publication of this man-
ual. In all instances, we recommend that you review and work to the latest version of
any standards.
EN 378
EN ISO 3745
2014/68/EU
2006/42/EC
2014/30/EU
2014/35/EU
EN 12735-1
EN 60204-1
(EU) No. 517/2014
2008/98/EC
2012/19/EU

Safety and User Information Multi-DENCO
12 FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020
2 Safety and User Information
The Multi-DENCO range is designed in accordance with state-of-the-art technological
and engineering standards as well as conforming to recognised safety regulations.
It must be used in an appropriate manner for suitable purpose. You must follow the
guidelines within this manual and take account of safety aspects and potential hazards.
Failure to follow the instructions within this manual may result in material damage,
incorrect operation or danger to health and safety. This manual attempts to give advice
on as many potential risks or hazards as possible, however it is unable to account for
all potential situations.
Therefore, all users must employ, or be qualified as, a trained professional to assess
and minimise any potential hazards, before handling the Multi-DENCO unit or acces-
sories.
2.1 Availability of the operation manual
This operation manual contains important information regarding safe and correct oper-
ation of the unit.
This manual must always be available at the site where the unit is operating. Every per-
son working on the equipment must read this manual fully before commencing any
work. They must observe and understand all relevant information before performing a
task.
The Operation Manual is intended to be used by:
– Fitting and installation companies
– Building service engineers
– Technical personnel
– Electrical and mechanical specialist
2.2 Scope of the operation manual
THIS IS AN ORIGINAL OPERATION MANUAL VERIFIED BY THE MANUFACTURER.
This document has been developed by the manufacturer specifically for details the
Multi-DENCO range. Information within this manual may be common to other designs
or products, but this manual is exclusive to Multi-DENCO and is non-transferable.
The information should not be used as a basis for any other products.
Every effort is made to ensure this manual is fair and accurate, but FläktGroup endeav-
ours to continuously update and improve all of our products. Due to this continuous
development, some information contained within this manual may become outdated or
no longer relevant. If you are in any doubt regarding any information contained within
this document, please contact your local sales or support representative who will be
happy to assist you further.

Multi-DENCO Safety and User Information
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 13
This operation manual covers topics in the following areas:
– Safety and User Information
– Technical Descriptions
– Shipping and Storage
– Installation
– Mechanical and Electrical Connections
– Commissioning
–Operation
– Servicing and Maintenance
– Troubleshooting
– Disassembly
2.3 Document format
Important information for each chapter will be highlighted in the following format:
– This symbol is used to indicate normal lists.
•This symbol indicates instructions to follow.
9The result of an action is indicated with this symbol.
NOTE!
Refer to the separate manual for controls and controller instructions.
NOTE!
This manual is valid only for configurations built from our standard catalogue.
Any units designed or as non-standard (sometimes referred to as 'Engineering
Specials'), may not be covered by previous, existing or future documentation.
Please refer to your sales/support contact for any information regarding non-stan-
dard designs.
NOTE!
Here you will find additional details on using the Multi-DENCO unit.

Safety and User Information Multi-DENCO
14 FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020
2.4 Signs used within this manual
2.4.1 Mandatory Signs
2.4.2 Prohibition Signs
General Mandatory Sign
Refer to manual or documentation
Wear ear protection
Wear eye protection
Wear safety footwear
Wear protective gloves
Wear protective clothing
Wear a protective mask
Guards must be used during operation
General prohibition sign
No smoking
No open flame, fire, open ignition source

Multi-DENCO Safety and User Information
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 15
2.4.3 Warning Signs
General warning sign
Warning of low temperature
Warning of electricity
v
Warning of suspended loads
Warning of toxic substances
Warning of hot surfaces
Warning of automatic starting machinery
Warning of sharp elements
Warning of crushing to limbs
Possible damage to machinery
Environmental damage

Safety and User Information Multi-DENCO
16 FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020
2.5 Labelling of safety information
The following symbols and notices are provided in appropriate places throughout this
document to designate the safety instructions:
2.5.1 DANGER – Death/serious irreversible injury
Indicates an extremely hazardous situation which will result in death or serious irre-
versible injury, if the safety instruction is not followed.
Example:
2.5.2 WARNING – Death/serious injury
Indicates a hazardous situation which can result in death or serious irreversible
injury, if the safety instruction is not followed.
Example:
Electrocution through hazardous voltage will lead to death or serious injury!
•Disconnect all electric power and ensure the power cannot be inadvertently
energized.
•Verify that all circuits are deenergized, earth, short-circuit and lock off all
neighbouring live parts.
High concentration of refrigerants in the air can result in death or serious in-
jury!
High concentration of refrigerants in the air may have an anaesthetic effect and
cause unconsciousness. Prolonged exposure may cause irregular heartbeat and
sudden death. Very high concentration of refrigerant may cause suffocation by
reduced oxygen content in the surrounding air.
•You should therefore only work in an adequately ventilated environment, and
exercise due care and attention when carrying out the work.
•Wear protective clothing and, if necessary, an autonomous breathing apparatus.

Multi-DENCO Safety and User Information
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 17
2.5.3 CAUTION – Minor or moderate injury
Indicates a hazardous situation which can result in minor or moderate injury, if the
safety instruction is not followed.
Example:
2.5.4 NOTICE – Environmental or material damage
Indicates actions that can result in equipment or property-damage only accidents.
Examples:
Injury due to sharp cutting edges!
•While cleaning care should be taken to prevent risk of injury due to thin fins.
•Wear protective gloves
NOTICE
NOTICE
Environmental Damage!
•Dispose of all components and materials (such as water-glycol mix) depending
on material type in an environmentally friendly manner and in accordance with
the local codes, practices and environmental regulations.
NOTICE
Damage to the unit!
•Do not mix up cables during connecting.
•Use the unit wiring diagram to check electrical cablings.

Safety and User Information Multi-DENCO
18 FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020
2.6 Safety-conscious working
The following is general advice. Specific information can be found in relevant chapters
in this manual.
2.6.1 At all times
To comply with EN 378-3 you must wear suitable Personal Protective Equipment
(PPE) at any point working on a Multi-DENCO unit. As a minimum we recommend to:
•Wear safety footwear
•Wear eye protection
•Wear protective gloves
•Wear protective clothing
If operating for a prolonged period of time, noise reducing ear protection may be
required.
•Always conduct your own personal risk assessment to evaluate any further
requirements.
2.6.2 During installation & commissioning
At these times there are higher risks involved with the handling and operating around
a Multi-DENCO system. Further information is provided in chapters 4 to 8.
•Always refer to the latest operation manual and technical documents provided with
the unit.
•Do not make assumptions based on other products design or documentation.
•If in doubt, contact your local sales office.
•Protect against unauthorised access.
•Do not use or employ un-qualified or inexperienced workers to install, commission
or service the Multi-DENCO system.
Filters (especially used or dirty filters) are easily flammable. Leaking refrigerant can
catch fire and emit noxious substances.
– No smoking is allowed in direct proximity of any aspect of the
Multi-DENCO system.
– No open flames near the system.
During installation there is a higher chance of leaks of refrigerant or glycol.
Before adding any cooling medium, ensure:
– Any system pipework is thoroughly tested for leaks
– Use non-polluting methods for testing purposes, e.g. Oxygen Free Nitrogen (OFN)

Multi-DENCO Safety and User Information
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 19
2.6.3 When unit is operational
Information regarding 'Fan touch protection' can be found in chapter 5.7.
Further relevant information is provided in chapters 9 to 11.
2.6.4 R410A systems
EN 378-1 defines R410A refrigerant to group A1. When using refrigerant consider your
usage in accordance to Regulation (EU) No. 517/2014.
Features of R410A:
– Non-combustible
– No direct toxic effect
– Colourless and odourless
– Heavier/denser than air
– Contains fluorinated greenhouse gases as defined by the Kyoto Protocol
– Ozone-depleting potential OPD: 0
– Greenhouse potential GWP: 2088
– Water hazard class WGK: 1, with a slight risk to water
At any time the unit is operational, rotating machinery and electrically charged com-
ponents are present. When the unit is not electrically isolated:
•Ensure all guards and doors are closed.
•Only remove guards or open doors:
– When the unit has been electrically isolated.
– Sufficient time has been allowed for the rotating fan momentum to cease.
– Sufficient time has been allowed for inverter circuits to discharge.
NOTE!
Refer to 'Field Charge' on the unit serial plate (see chapter 1.2) in regards to system
refrigerant volume.
NOTICE
•Always refer to the Material Safety Data Sheet (MSDS) from the supplier.
– Information relating to hazards, handling and storage, first aid amongst other
information is contained within the MSDS.
•Store these document(s) along with the Multi-DENCO documents.
Due to the nature of a refrigeration circuit, a Multi-DENCO system can contain dan-
gerously hot and dangerous cold aspects within the same system or circuit. Failure
to wear PPE could result in moderate injury.
•Review the appropriate chapters for further information.
•Never touch any part of the refrigeration circuit with unprotected skin.
•Always conduct your own personal risk assessment to evaluate any further
requirements.

Safety and User Information Multi-DENCO
20 FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020
2.6.5 Systems containing glycol
General features of glycols:
– Usually mixed with water.
– Can reduce the freezing temperature point of the mixture.
– Reduces cooling capacity when compared to water-only systems.
Further information can be found in chapter 6 and chapter 8 of this manual.
2.7 Proper use
The Multi-DENCO series are designed as indoor units and for connection to a heat
rejection system. They are designed for cooling, heating, humidification, dehumidifica-
tion and filtering of air at atmospheric pressure.
Proper use also requires:
– Fulfilling the requirements of any operation manual
– Fulfilling the requirements of any controls manual
– Regular inspection and maintenance
Improper use Any other use is considered improper. The manufacturer/supplier is not liable for dam-
age arising from improper use. The user alone bears any risk or cost that can be
attributed to 'improper use'.
It is not allowed to operate units:
– in explosion risk areas
– in areas with strong electromagnetic fields
– in environment with high levels of air contamination
– (unless otherwise stated) in environments with corrosive and/or aggressive air (e.g.
areas near large volumes of salt water)
2.8 Modifications and changes
Any modification or change to Multi-DENCO units, after dispatch, that is not covered
by this manual, are subject to approval by FläktGroup. Non-compliance with these
requirements could invalidate the CE Conformity or void the warranty.
2.9 Spare parts
Only original spare parts from FläktGroup are allowed. Use of third party spare parts
are not allowed and are at the user's own risks. If in any doubt as to the spare part
required, please contact your local sales representative who will be able to assist.
NOTICE
Properties of different glycols can vary significantly between types and different manu-
facturers
•Always refer to manufacturer’s information for usage guidelines
•Always handle and dispose in accordance with local codes, practices and
environmental regulations.