Page 1 ® Multi-DENCO OPERATION MANUAL...
Page 2: Table Of Contents
Table of Contents Multi-DENCO Typecode ..................4 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 ............
Page 3 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.
Page 4: Typecode
Type code Multi-DENCO Type code Indoor Unit DENCO Multi-DENCO A-Version - AirCool C-Version - ChillCool F-Version - FreeCool W-Version - WaterCool P-Version - AtmoCool X-Version - SplitCool Size 010 Size 018 Size 030 Size 045 Size 065 Size 092 Size 130...
Page 5 Multi-DENCO Typecode WaterCool Module DENCO Multi-DENCO WaterCool Module Water Cooled Water Cooled Free Cooling Alongside Underfloor Size 010 Size 018 Size 030 Size 045 Size 065 Size 092 Size 130 Brazed Plate Heat Exchanger Shell & Tube Heat Exchanger Not Fitted...
Page 6 Typecode Multi-DENCO Outdoor Unit DENCO Multi-DENCO Outdoor unit Condenser Drycooler Condensing unit Hybrid Water / Glycol mixture Mixture R410A EC fan AC fan with fan speed controller AC fan Single circuit Not fitted 3~400 V, N, PE, 50 Hz 1~230 V, N, PE, 50 Hz...
Page 7 Type code Multi-DENCO DENCO-OfficeCool Denco Multi-DENCO Chilled water OfficeCool Split System OfficeCool Size 018 Size 030 Size 045 Downflow Upflow Front full height panel Standard heat exchanger Heat pump heat exchanger Not fitted Steam humidifier standard conductivity Steam humidifier low conductivity...
Page 8: Overview Of Units And Scope Of Supply
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.
Page 9: Product Series Overview
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 –...
Page 10: Denco-Officecool
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.
Page 11: Scope Of Supply
Overview of Units and Scope of Supply 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) –...
Page 12: Safety And User Information
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. Availability of the operation manual This operation manual contains important information regarding safe and correct oper- ation of the unit.
Page 13: Document Format
Document format Important information for each chapter will be highlighted in the following format: NOTE! Here you will find additional details on using the Multi-DENCO unit. – This symbol is used to indicate normal lists. • This symbol indicates instructions to follow.
Page 14: Signs Used Within This Manual
Safety and User Information Multi-DENCO Signs used within this manual 2.4.1 Mandatory 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 2.4.2 Prohibition Signs...
Page 15 Multi-DENCO Safety and User Information 2.4.3 Warning Signs General warning sign Warning of low temperature Warning of electricity 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...
Page 16: Labelling Of Safety Information
Safety and User Information Multi-DENCO 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.
Page 17 Multi-DENCO Safety and User Information 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: Injury due to sharp cutting edges! • While cleaning care should be taken to prevent risk of injury due to thin fins.
Page 18: Safety-Conscious Working
Multi-DENCO system. – No open flames near the system. 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 •...
Page 19 – Greenhouse potential GWP: 2088 – Water hazard class WGK: 1, with a slight risk to water 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.
Page 20: Proper Use
Further information can be found in chapter 6 and chapter 8 of this manual. 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.
Page 21: Disposal
1. 2.13 Environmental considerations Some Multi-DENCO versions use refrigerants, therefore careful and specific attention is required in respect to handling and storing refrigerants. Consideration must be given to minimise or eliminate any discharge of refrigerant (accidental or deliberate).
Page 22: Technical Description
– Commissioning / readiness for operation of the unit 3.1.1 DENCO-OfficeCool This is a variation of a Multi-DENCO unit designed specifically to address the needs of comfort cooling. The design is aimed at reducing fan velocities, reduced sound and features for integration with Local Environment Control Units (LECUs) allowing for adjustable environment to suit comfort levels.
Page 23: Operating Limits
Multi-DENCO Technical Description Operating limits NOTE! IMPORTANT: The following tables represent individual operating limits within the devices. Not all combinations of limits will result in correct operation. For guidance on suitable applications of your equipment, contact your local sales office.
Page 24 Technical Description Multi-DENCO CombiCool Circuit Only Location Feature Property Unit CombiCool Indoor Inlet Water Temperature °C Indoor Water Delta Temperature °C Misc Water Glycol Concentration Misc Water Operating Pressure Default tolerance for standard design. 1 MPa options available. Tab. 3-2...
Page 25: Operating Modes
Technical Description Operating modes A basic Multi-DENCO unit only has the capacity to perform cooling, therefore only being able to control the upper limit of the temperature of the room. Heaters and humid- ifiers can be added to the design to allow for control of both the lower limit of tempera- ture and to control the humidification of the room.
Page 26 Technical Description Multi-DENCO activated and both run at the same time. As the direct expansion circuit uses a high efficiency inverter compressor, running the FreeCool circuit at the same time reduces the operating point of the direct expansion circuit, further increase performance and energy efficiency.
Page 27: Operating Strategies
Technical Description Operating strategies Multi-DENCO's inbuilt advance software combined with the latest EC variable technol- ogy and networking capability, enables the unit to operate with intelligent control strat- egies to increase performance or maximise energy savings. In most instances we would recommend using a Running Redundancy strategy to help maximise the energy savings possible.
Page 28 This also saves energy as the Multi-DENCO fans only supply the same amount of air to the floor void, as the amount of air being removed by servers.
Page 29: Components
Multi-DENCO Technical Description Components Fig. 3-3: Components Casing The casing design gives the unit a high level of air tightness. The side and rear panels are flat and are flush with the edge of the frame. The front doors are removable during servicing.
Page 30 Multi-DENCO EC fan All Multi-DENCO units use direct driven, variable speed, high efficiency EC plug back- ward curved fan with three dimensional profiled blades as standard. The impeller is optimally balanced according to ISO1940 and fan speed modulates on standard set- tings.
Page 31: Heat Rejection Systems
If such support is required, please contact your local sales representative for details. Heat rejection systems A Multi-DENCO unit needs to be part of a system which includes heat rejection. There are several different methods for heat rejection (depending on your Multi-DENCO unit) and your local sales office can help you decide the best for your requirements.
Page 32 Condensers can be installed either with a direct 1 to 1 relationship with the indoor unit or 2 condensers can be used with a single Multi-DENCO unit as part of 1 single circuit. This arrangement is refer to as 'twin condensers'.
Page 33 Technical Description 3.6.6 WaterCool Module Both of our Multi-DENCO W-Version and P-Version are supplied with WaterCool Mod- ules to enable heat transfer from the refrigerant circuit to the suitable water circuit. These contain valves or variable pumps to regulate the water flow and heat transfer within the module.
Page 34: Shipping And Storage
If the unit is stored for a period of time before installation or commissioning, it must be protected from the elements and build-up of dust and dirt! Handling Multi-DENCO units are heavy and can have a high centre of gravity. Failure to safely secure the equipment may result in death or serious injury. •...
Page 35: Storage
Multi-DENCO Shipping and Storage • Before lifting or shipping the unit, make sure that all mountings are fixed and secured. • Only use lifting gear with sufficient load carrying capacity. • Never use damaged lifting equipment. • Ropes/chains shall not be knotted or be exposed to sharp edges.
Page 36: Installation
– (If applicable to local regulation) Check installation site fulfill requirements as defined in EN 378. The Multi-DENCO unit is located, then it is fixed in placed (e.g. bolted, bracketed etc) to prevent unwanted movement or vibrations. FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020...
Page 37 5.1.2 Noise consideration at installation site It is important noise has been considered before the installation. Options are available to equip your Multi-DENCO unit with sound reduction features. Noise is usually a high consideration of DENCO-OfficeCool installations therefore. Ask your local sales repre- sentative for details.
Page 38: Substructures
Installation Multi-DENCO Substructures 5.2.1 Under unit drip tray To protect the floor underneath a unit from any condensation, a drip tray can be mounted underneath. The drip tray can be used in a raised floor (underneath a base frame) or with a plinth.
Page 39 Multi-DENCO Installation 5.2.5 Ceiling connection duct For units that wish to connect with a suspended ceiling, a connection duct can be used to create an air path. The ceiling connection duct is made of the same material as the unit's panels. The height of ceiling connection ducts are made to specification and they can bolt onto the top of the close control unit through a service panel on either side.
Page 40: Unit Placement
• Never stand beneath suspended loads. Multi-DENCO units are heavy and can have a high centre of gravity. The unit, or parts of the unit can, tip and fall. Failure to safely install the equipment may result in death or serious injury.
Page 41 Multi-DENCO Installation 5.3.1 Manipulation of the indoor unit • Upon arrival of the unit, check any hidden damage caused while the transport and report the damage to the sales representative in your area. Fig. 5-9 • Move the unit (1 in Fig. 5-9) to the closest place to the installation area by a forklift and make sure that the center of gravity (2 in Fig.
Page 42 Installation Multi-DENCO • Repeat the previous step on the other side. • Use two Heavy-Duty Jacks to handle the unit on the both sides, refer to Fig. 5-12. • Make sure to add a protective carton between the surfaces of the unit and the jacks to prevent any scratch, dent, notch or any other damage to the unit.
Page 43 M6 bolt (3 in the Fig. 5-13) & washers (4 in the Fig. 5-13), then place the Multi-Denco unit (1 in the Fig. 5-13) on the plinth and connect them with the same kit, bolt (3 in the Fig.
Page 44 NOTE! We strongly recommend using a third party, specialist lifting company to offload and position all Multi-DENCO equipment. 5.3.4 Placement on raised floor • Perform the levelling of the unit at the installation site.
Page 45: Clearance And Access
2000 Tab. 5-1 Fig. 5-15 Columns A, B and D are recommended minimum values to ensure satisfactory oper- ation by your Multi-DENCO unit. Column C is the mandatory minimum values to ensure service access for your Multi-DENCO unit. Note! When the WaterCool Module of W-Version is mounted beside the main unit, addi- tional width of the module must be added to the width column.
Page 46 (standard are flat doors). Access to the right hand side panel (as you face the unit) can increase the speed of service, but is not mandatory. Multi-DENCO units are compact and efficient design, therefore the larger the clearance all around the unit, the easier service and repair work can be conducted.
Page 47 Multi-DENCO Installation 5.4.3 Removing doors and panels Doors and panels can weigh up to 11 kg and easily tip and fall. • Ensure panels are held in place when fixings are being removed. • Ensure doors are properly attended when being removed.
Page 48: Installing Enclosed Accessories
Multi-DENCO Installing enclosed accessories Below is a list of items or options that could be supplied with your Multi-DENCO unit. The accessories could be inside of the unit on delivery or as a separate package. The below items will need further installation once the unit is in place.
Page 49 Multi-DENCO Installation 5.5.4 Water detection Important Note! The water detection tape should be installed prior to commissioning and the end user should be made aware that, upon contact with water, an alarm is generated by the controller as an indication of the presence of water. This alarm is not critical to the unit's operation, therefore the unit will continue to operate.
Page 50 C5-12 controller. For further details refer to the wiring diagram. Fig. 5-22 5.5.7 Ambient Temperature Sensor This item will be supplied loose within your Multi-DENCO unit. This sensor must be installed for the FreeCool functions to operate. The sensor must be: –...
Page 51: Installation Of Outdoor Units
More information regarding the ATS can be found in chapter 7. Installation of outdoor units NOTE! It is mandatory to connect the Multi-DENCO indoor unit to a heat rejection unit. This is achieved typically in six different forms, depending on the version used: – Condensers (DMOUCD) –...
Page 52 If your pipework separation lengths are different between your direct expansion and FreeCool circuits, please contact your local FläktGroup representative for support. For W-Version, the separation between the indoor Multi-DENCO unit and the Water- Cool module must be within the following limits for the interconnecting pipework re- quirements: –...
Page 53 Multi-DENCO Installation – The interconnecting pipework in one direction between the indoor unit and the WaterCool module must be less than 20m. For more details about interconnecting pipes, please see chapter 6. 5.6.3 Positioning The condenser must be installed on a level surface that can support the weight of the equipment and allowing for access from all sides.
Page 54 Installation Multi-DENCO NOTE! Table height must be more than 600 mm if the vertical position is required. Fig. 5-24 For the Hybrid Unit DMOUHM: • For placing the unit on the installation place, use a crane and un-stretchable slings, spreader bars or any other equivalent device for holding the unit and make sure to connect it properly (Fig.
Page 55 Multi-DENCO Installation Fig. 5-25 5.6.4 Legs Installation Supplied legs must be mounted on the casing box of the unit by the provided screws and tighten them by 46 Nm to prevent any vibration in the unit during operation. For horizontal operation, install legs on the opposite side to the hanging lugs and start lifting the unit again by the same way (Fig.
Page 56 Installation Multi-DENCO Fig. 5-27 Vertical airflow condensers must not be installed upside down. Fig. 5-28 Increased weight of DMOUHM • The hybrid heat rejection (DMOUHM) unit has increased weight compared to a condenser (DMOUCD) or drycooler (DMOUDW). • This is due to using 2 heat exchanger coils inside of 1 unit.
Page 57 Multi-DENCO Installation 5.6.5 Clearances Condensers must be located in an unobstructed position to ensure adequate air circu- lation through the cooling coil. Care must be taken to avoid air recirculation from one unit to another. Clearances around the condensers must be in accordance with condenser specific drawings supplied in the unit documentation.
Page 58: Fan Touch Protection
It is extremely important that no one can come into contact with the fans within the Multi-DENCO units during operation or immediately after operation. Users must wait 5 minutes after turning off a Multi-DENCO unit before removing any safety guard, to ensure fans have come to a complete stop.
Page 59 Multi-DENCO Installation It is the responsibility of the installer to carry out the assessment and to prepare the EC Declaration of Conformity. For the installation of the interconnecting pipework and electrical cabling, the declaration must then be signed by your legally responsible rep- resentative (which may be the Managing Director of the Company).
Page 60: Medium Connections
Only copper refrigerant lines meeting EN 12735-1 shall be used for refrigeration pipe- work installation. R410A is the standard refrigerant used within Multi-DENCO units, ensure that pipework used is suitable for the higher pressures used with this refriger- ant.
Page 61 Multi-DENCO Medium Connections 6.2.2 Material quality For refrigeration pipework: – Copper tube quality must be the equivalent of EN 12735-1 – Refrigeration grade copper must be used – Pipework must be cleaned and dehydrated – Use of joints, bends or sets must be kept to a minimum –...
Page 62 Only valid for unit combination listed within table. For any other version please contact your local sales/service support. 6.2.4 Installation with 2 condensers On Fig. 6-1 and Fig. 6-2 the labels are as follows: Discharge line (hot gas) from the Multi-DENCO indoor unit Branches of discharge line Liquid Line returning to the Multi-DENCO indoor unit...
Page 63 Multi-DENCO Medium Connections Horizontal airflow Isometric View Top View Fig. 6-1 Vertical airflow Isometric View Side View Fig. 6-2 FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020...
Page 64 All pipework, which is subject to changes in temperature, expands and contracts. The routing and joining of the pipework must be capable of absorbing this movement. An example of the rate of expansion on a Multi-DENCO unit is as follows: Pipe Pipe Operating Expansion in 0 °C...
Page 65 Each site must be individually assessed depending on pipework exposure, position, length and accessibility to pipework, but for Multi-DENCO units: A-Version: Liquid lines do not need to be insulated, but may be required due to site conditions and accessibility to pipework.
Page 66 Medium Connections Multi-DENCO 6.2.7 Cutting tubes Where appropriate, pipework and cables shall be sleeved when passing through build- ing walls or roof structures. When cutting copper tubing or pipe, care must be exercised to prevent the filings or cuttings from entering the pipe. Some effective means should be used to clean out the small particles of copper when they do enter the tube or pipe.
Page 67 Multi-DENCO Medium Connections 6.2.9 Oil traps Fig. 6-4: Requirements of discharge lines for A-Version systems Fig. 6-5: Requirements for oil traps on W-Version systems FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020...
Page 68 Medium Connections Multi-DENCO If the heat rejection unit(s) are installed ABOVE the Multi-DENCO unit, for the dis- charge line: – The height separation must be no larger than the maximum values shown on Fig. 6- 4 & Fig. 6-5. – 'P' traps must be installed at the bottom of EVERY vertical riser in the discharge line, including pipework outside of riser cupboards (Detail 1) –...
Page 69 Multi-DENCO Medium Connections Fig. 6-7 The following requirements are for a factory fitted PRV only (Castel 3060/24C). If the PRV is replaced with another brand, then this must be assessed and corrected by a competent persons. The maximum pressure drop allowed within the exhaust line is 10 bar.
Page 70 Medium Connections Multi-DENCO For every 90° elbow, For every 45° elbow, reduce the maximum reduce the maximum Maximum pipework Pipe Size pipework length al- pipework length al- length (metres) mm / DN lowed reduces by: lowed reduces by: (metres) (metres) DN20 0.220...
Page 71 On certain downflow units, access to the refrigeration pipework connections can be dif- ficult (especially if there is no side access to the unit). Multi-DENCO units are designed to allow for the removal of fan closest to the pipework to make installation easier.
Page 72: Refrigerant Pipework Testing Procedures
A pressure test certificate must be signed, witnessed and passed to the commissioning engineer. NOTE! The use of 'tracers' or 'dyes' are not permitted on Multi-DENCO units under any cir- cumstances. NOTE! Depending upon your commercial agreement, you may be required to perform the vacuuming and oil and refrigerant pre-charging of the system, before the commis- sioning engineer's arrival.
Page 73 Multi-DENCO Medium Connections 6.3.1 For model sizes 010 to 065 These instructions apply to all version with a direct expansion circuit. For standard units, all devices fitted to the low pressure side of the system are sufficiently pressure rated and can remain connected to the system during pressure testing.
Page 74 Medium Connections Multi-DENCO 4: To ensure quality of installation, it is highly recommended to conduct a "Tightness Test". Reduce the pressure in the system to the appropriate Maximum Allowable Pressure (MAP) for both the low and high pressure sides and observe for 24 hours (recommended).
Page 75: Humidifier Water Connections (Optional)
Multi-DENCO Medium Connections Humidifier water connections (optional) The humidifier unit must be connected to a standard piped cold water supply. All mains water pipework to humidifiers must be installed to national and local standards, in par- ticular, local water authorities' regulations and requirements.
Page 76: Connecting Condensate Drain
Medium Connections Multi-DENCO Connecting condensate drain The following should be considered during installation: Air handling unit – Drainpipe runs shall be 22 mm OD or larger of water carrying quality of either copper or high temperature rigid plastic and should be adequately supported at regular intervals and have a slope of at least 2% to ensure drainage.
Page 77: Connecting Water Pipework
Multi-DENCO Medium Connections Connecting water pipework 6.6.1 Water pipes material quality For water pipework: – Copper tube quality must be the equivalent of EN 1057 – Pipework must be cleaned and dehydrated – Use of joints, bends or sets must be kept to a minimum –...
Page 78 – All high points and coils of the water circuit must be provided with vent cocks to enable system venting to prevent air locks. Your Multi-DENCO unit is already pro- vided with a vent at the top of the coil.
Page 79 Multi-DENCO Medium Connections AIR HANDLING UNIT CASING CHILLED WATER RETURN TO RECOMMENDED CHILLED WATER MAIN/CHILLER EXPANSION TANK WATER FILL RECOMMENDED CONDENSATE TRAY/DRAIN CHILLED WATER SUPPLY FROM CHILLED WATER MAIN/CHILLER LINE TYPES: HUMIDIFIER CONDENSATE / WATER SUPPLY HUMIDIFIER DRAIN CHILLED WATER SUPPLY...
Page 80 Medium Connections Multi-DENCO Fig. 6-12: Examples of the W-Version Fig. 6-13: Example of P-version FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020...
Page 81 Multi-DENCO Medium Connections 6.6.3 Water quality Recommendation on water quality for chilled, warm and condensing water circuits/heat exchanger: Parameter Unit Value pH-value (at 20 °C) 7.5 - 9 Conductivity (at 20 °C) S/cm < 700 Dissolved solid materials (cR) mg/l <...
Page 82 Medium Connections Multi-DENCO When using glycol: • Water-glycol mixture does not have a burst effect starting from frost resistance of -20 °C, as slush ice forms when the mixture is cooled below the freezing point. • Use only one type of glycol, do not mix different types.
Page 83 Medium Connections 6.6.7 F-Version Sizing ® – The FreeCool water circuit is individual per Multi-DENCO unit – The EC water pump fitted within the indoor unit – A water strainer must be fitted between the indoor and outdoor unit in the FreeCool Circuit –...
Page 84 Medium Connections Multi-DENCO Fig. 6-15 A =FreeCool Coil 1: FreeCool OUT 3: Direct Expansion IN B =Direct Expansion Coil 2: FreeCool IN 4: Direct Expansion OUT 6.6.9 P-Version Variances NOTE! Ensure that the outdoor unit is installed within the separation limits as specified in chapter 5.6.2...
Page 85 Multi-DENCO Medium Connections For the size 065 of the P-Version; there is only one hose that is on the header’s port, the pump outlet can be connected directly to the main unit inlet by the flanges that are fixed on the both units, if the pipes are in misalignment, unfasten the bolts of the pump and the expansion vessel and move them a little bit on the slots that are on the pump base to match the correct position of the main unit pipe.
Page 86: Electrical Connections
Electrical Connections Multi-DENCO Electrical Connections When making an electrical installation, the installer must: • Be qualified and licensed according to local and regional regulation. • Observe regulation relating to electrical power supply for the installation region • Observe the Low Voltage Directive 2014/35/EU •...
Page 87: Connecting Mains Power Supply
7.2.4 Cable routing inside unit – Multi-DENCO units are designed for cable entry from the BOTTOM of the unit. – Secure any interconnecting cables within the unit and ensure that the cables cannot make contact with the fan or any hot components.
Page 88 The Automatic Transfer Switch (ATS) allows for 2 mains power supplies to be con- nected with the Multi-DENCO unit. In the event of a power failure, the switch will switch from the "Primary" power supply to the "Secondary" power supply. During this process, the power supply to the unit is disconnected.
Page 89 Multi-DENCO Electrical Connections Fig. 7-3 1: Nominal Voltage 2: Voltage Range - Recommended 5% 3: Mains Failure Timer (MFT) – Recommend 5 seconds 4: Mains Return Timer (MRT) – Recommend 2 minutes FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020...
Page 90: Connecting Outdoor Unit
We STRONGLY recommend that the outdoor unit should be connected to the indoor unit for its power supply. 7.3.1 A-Version Condensers (DMOUCD) that are supplied with A-Version Multi-DENCO units are pro- vided with their OWN SEPARATE ISOLATOR. For condensers, the following power and controls layouts are possible: Fig.
Page 91 NOTE! Power supply is dependent on outdoor unit's size. See electrical drawing for details. Multi-DENCO X-Version and DENCO-OfficeCool units are provided with PAC interface control boards to allow for control of condensing units. If 2 outdoor units are required, 2 boards will be provided.
Page 92: Connecting Signal Cabling
1.5 mm cross-section: – Multi-DENCO units are designed for cable entry from the BOTTOM of the unit. – Secure any interconnecting cables within the unit and ensure that the cables cannot make contact with the fan or any hot components.
Page 93 Electrical Connections 7.4.3 Unit networking When multiple Multi-DENCO are located within the same cold space, it is best practice to set them up in a DencoNet network. Creating a network has the advantages of being able to perform sensor averaging or rotating standby units.
Page 94: Customer Terminals On C5-12 Unit Controller
Electrical Connections Multi-DENCO Customer terminals on C5-12 unit controller Please refer to the wiring diagram and Controls manual for more details about connec- tion to the controller or terminals. Fig. 7-7 Controller Description Display connection for pGDX and pGD1 display...
Page 95: Commissioning
– Different options can require different commissioning procedures (e.g. winter kit). – This chapter applies to initial commissioning as well as re-commissioning due to extended shut down periods or relocation. – Only R410A can be used in Multi-DENCO systems. Refrigerants poses hazardous risks: – Refrigerant cylinders can be heavy.
Page 96: Pre-Commissioning Procedure
Commissioning Multi-DENCO 8.1.2 Suggested equipment It is important that all equipment is safe to use, is calibrated and is portable appliance tested (PAT) where appropriate. Below is a list of recommended equipment to be able to commission a unit: – Electrical test meter –...
Page 97 (if fitted) WaterCool Module (W-Version) • If installed remotely from the Multi-DENCO unit, ensure that it is stable and secure. • If installed alongside the Multi-DENCO unit, ensure the module is connected correctly and securely.
Page 98 Check any water circuit safety devices for proper function For P-Version: • Check the hydraulic connections between Multi-DENCO unit and the WaterCool module have been made correctly. 8.2.5 Checking electrical connections Untested or unused electrical systems pose higher risks of faults.
Page 99 Multi-DENCO Commissioning NOTE! When commissioning a unit with the option: "Automatic Transfer Switch (Dual Power Supply)" it is important to check the electrical supply of BOTH the incoming supplies. Both electrical supplies must match the requirements of the unit name- plate.
Page 100 It is as follows: Initial evacuation • Connect the service manifolds to the Multi-DENCO system in an appropriate and safe manner. • Make sure that all system valves are open (i.e. shut off valves) •...
Page 101 Multi-DENCO Commissioning NOTE! Multi-DENCO units can contain two different types of compressors – each with their own oil type. Please follow the below recommendations: Size 010 - 065 Size 092 - 130 FV50S POE 160SZ Emkarate RL68H Emkarate RL32H Mobil Arctic EAL68 Alternative oils are compatible with the original oil type used, therefore these can be mixed and alternatives can be used as "top up".
Page 102: Commissioning Procedure
– Current conditions (during commissioning) – (Possible) future conditions For example, attempting to commission a Multi-DENCO A-Version unit in a room with no heat source is difficult, as you would not be able to give a consistent operation to observe refrigerant charge. Alternatively, commissioning a unit on a cold day could result in lower condensing temperatures, which may cause over-charging of a unit.
Page 103 • Ensure the outdoor unit's isolator is set to 'ON' (if applicable) • Enable any 'in-line' isolation for the Multi-DENCO unit • Set the door interlock isolator (if fitted) to the 'ON' position •...
Page 104 Details of how to change values in the C5-12 controller are available in the Multi-DENCO con- trols manual.
Page 105 Multi-DENCO Commissioning Procedure With a stable system, additional refrigerant can be progressively added to the circuit to bring the system to the required charge. When adding refrigerant, the following proce- dure and advice applies: • Refrigerant should be added to the suction line as liquid •...
Page 106 Function Test of Safety Device(s) Multi-DENCO units are fitted with High Pressure (HP) switch(s) to mechanically protect the refrigeration circuit. After charging, these MUST BE TESTED. For details of the procedure, please refer to the controls manual.
Page 107 Multi-DENCO Commissioning 8.3.6 Commissioning water circuits The following procedure applies to any water circuit used within a Multi-DENCO sys- tem (C-Version, CombiCool circuit, O-Version, F-Version, W-Version, P-Version etc). Procedure • Check for an established water flow • Check that any temperature sensors are securely fastened to the correct pipework •...
Page 108 2-port Pressure Independent Control Valves (PICV) NOTE! The following instructions are for 2-port PICV valves used with C5-12 controllers in Multi-DENCO units. For all other configurations or equipment please see separate manuals or contact your local office. FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020...
Page 109 Multi-DENCO Commissioning To set up the maximum design chilled water flow rate, on site: • The unit must be powered on, pre-commissioned and running under automatic control • The chilled water pump must be operating to provide pressure differential across the unit of 100 kPa (minimum 50 kPa, maximum 350 kPa) •...
Page 110 Commissioning Multi-DENCO 8.3.11 Systems fitted with a Pressure Relief Valve (PRV) Pressure Relief Valves could be fitted: – On W-Version units on the liquid receivers in the WaterCool Module – On P-Version units on the shell and tube condenser in the WaterCool Module –...
Page 111 Multi-DENCO Commissioning Condenser Liquid Receiver – 100% Capacity 100% Filled – R410A 80% Filled – R410A Size Litres DMOUCD013 DMOUCD021 12.0 DMOUCD026 14.4 DMOUCD032 16.8 DMOUCD050 16.8 DMOUCD075 Tab. 8-4 At average condensing temperatures of 41 °C with 6 K sub-cooling; 35 °C liquid temperatures. Density = 1 kg per litre.
Page 112 Commissioning Multi-DENCO Required level Level when 'liquid flashes' are observed. Fig. 8-2 • Add ALL the remaining estimated refrigerant to the system to fill the liquid receiver further. 6. Once all the refrigerant has been added, the liquid receiver needs to be checked.
Page 113: Post-Commissioning Procedure
As mentioned previously, it is very important that you submit a copy of the 'Multi-DENCO Commissioning Report' (chapter 13.3) to your local sales/service repre- sentative, so that this can be retained against the project. Failure to do so may invali- date warranty.
Page 114: Operation
– Location of power distribution board isolator – Location of the mains isolator – Either fitted within the door of the Multi-DENCO unit or within 1m of the unit – Location of circuit breakers (MCBs) inside the Multi-DENCO unit – Shut off (isolation) valves for the Multi-DENCO unit including (if applicable): –...
Page 115 Multi-DENCO Operation 9.2.2 The home screen (C5-12) 1: Unit ON/OFF (by keyboard) 11: Help/additional information 2: Unit Status 12: Date 3: Alarms Page 13: Network Status 4: Unit Graphs 14: Unit Number (for networking) 5: Login 15: Unit function Icons...
Page 116: Alarms And Error Messages
Once fan momentum has ceased and the inverter energy discharged, you can open the doors and conduct work. • To stop the Multi-DENCO unit, simply press the ON/OFF button on the home screen. The screen will display 'UNIT OFF BY KEYBOARD' if successful.
Page 117: Servicing And Maintenance
Multi-DENCO Servicing and Maintenance 10 Servicing and Maintenance Regular preventative maintenance of your equipment is strongly recommended to ensure that it is kept in excellent operating condition. Along with equipment recommended in Chapter 2, we recommend that a protective mask is worn during service and maintenance.
Page 118: Maintenance Access
Fig. 10-1 10.2.1 Example Maintenance schedule Below show an example maintenance schedule for a Multi-DENCO unit. We advised the below is the minimum requirements. Most situations will require further actions and a shorter time interval to ensure good operating conditions.
Page 119 Multi-DENCO Servicing and Maintenance Interval Action 1: Check for any outstanding alarms. Daily 2: Check display for good operation. 3: Visual inspection of exterior condition of the unit. 4: Visual inspection in and around the unit for the presence of liquids, which may show signs of a leak.
Page 120: Refrigerant Leak Testing
– Changes or extensions to the system – Suspicions of refrigerant leakage – On Multi-DENCO systems with a R410A refrigerant charge of 2.4 - 23.9 kg (equiva- lent 5 - 50 tonnes CO ) a yearly leak test is mandatory.
Page 121: Closing Down Procedure
Multi-DENCO Servicing and Maintenance 10.7 Closing down procedure It is essential for starting, closing down, emergency operation and fault finding to know the location of the following components: – Location of isolator for power distribution to the unit – Main Isolator (integral to unit or local position) –...
Page 122: Logbook & Eu Regulation
Servicing and Maintenance Multi-DENCO 10.8 Logbook & EU Regulation A logbook should be available throughout the working life of the equipment. In the EU this is a legal requirement if the system charge is 2.3 kg or above. The logbook needs to be updated after each maintenance to comply with EN 378-4:2016+A1:2019 and should include the following information: –...
Page 123: Fault Finding And Troubleshooting
Fault Finding and Troubleshooting 11 Fault Finding and Troubleshooting The Multi-DENCO range is designed to perform its primary function: cooling of the con- trolled space, for as long as possible. As long as a consistent and suitable power sup- ply is given to the unit, only 'Critical' alarms will stop the unit performing its primary function.
Page 124: Common Issues
(electrical power, water, free airflow etc.). Multi-DENCO units use fans which are regulated independently by the main control board. Removing guards whilst unit is operational risks death or serious injury. Inverters also store energy for a period of time after isolation.
Page 125 Multi-DENCO Fault Finding and Troubleshooting Fault Possible Reason Possible Remedy Low pressure in refrigeration sys- Possible leak in pipework Investigate location of leak and repair. Once repair perform tem (low pressure alarm) pressure tests and re-commission Refer to commissioning report and compare current condi-...
Page 126: When The Pressure Relief Valve (Prv) Has Discharged
Fault Finding and Troubleshooting Multi-DENCO Fault Possible Reason Possible Remedy Unit not cooling/heating/ Airflow failure alarm Check fan operation and suitable clearances in and around humidifying/dehumidifying the fan. Check output of the controller to the fan and each fan relay is energised.
Page 127: Dismantling And Disposal
• Once mechanically and electrically separated from the system, attend to releasing the Multi-DENCO unit from any fixings to the floor or other sub-structures • Prepare the unit for handling and transportation as per chapter 4...
Page 128: Disposal
Dismantling and Disposal Multi-DENCO 12.2 Disposal NOTICE • Dispose of all components and materials in accordance with local codes, practices and environmental regulations. An authorized appointed contractor specializing in waste processing shall dispose of the unit or its individual components. This appointed contractor shall ensure that: –...
Page 129: Appendix
This is the template for recording the system pressure test conducted on the Multi-DENCO circuit, once the mechanical installation has been completed. Multi-DENCO Commissioning Report A-Version 13.3 This is an example commissioning report that can be used on Multi-DENCO A-Version units. Multi-DENCO Commissioning Report C-Version 13.4 This is an example commissioning report that can be used on Multi-DENCO C-Version units.
Page 130: Pre-Commissioning Checklist (Dqa 880)
Appendix Multi-DENCO 13.1 Pre-Commissioning Checklist (DQA 880) Pre-Commissioning Checklist ® For DENCO Systems IMPORTANT: Failure to complete this form IN FULL before Commissioning Engineer’s arrival may result in commissioning being aborted. Your signature confirms compliance with this checklist’s requirements and accepts any subsequently incurred charges, where the requirements has not been adhered to.
Page 131 Multi-DENCO Appendix Pre-Commissioning Checklist ® For DENCO Systems IMPORTANT: Failure to complete this form IN FULL before Commissioning Engineer’s arrival may result in commissioning being aborted. Your signature confirms compliance with this checklist’s requirements and accepts any subsequently incurred charges, where the requirements has not been adhered to.
Page 132 All information regarding pipework requirements is listed in Chapter 6 of the relevant operation manual. Oil traps must be ® installed (if they are required) for Multi-DENCO systems. You FläktGroup contact can assist with a Pipe Size and Refrigerant Charge datasheet which will advise quantity of oil traps required.
Page 133: Pressure Test Certificate (Dqa 653)
Multi-DENCO Appendix 13.2 Pressure Test Certificate (DQA 653) Pressure Test Certificate ® For Multi -DENCO Installations Customer Site Address Contract Number Air Handling Unit Reference Air Handling Unit Type Condenser Unit Type Damage to the Unit! • Interconnecting pipework must be designed & installed in accordance with Sound Engineering Practice.
Page 134: Multi-Denco Commissioning Report A-Version
Appendix Multi-DENCO 13.3 Multi-DENCO Commissioning Report A-Version ® -DENCO Commissioning Record Cover Sheet: For completion by the project's Contract Engineer (1 sheet per model or variant per site) All information to be completed before hand-over to Commissioning Engineer Contract's Engineer Date Required &...
Page 135 Multi-DENCO Appendix ® -DENCO Commissioning Record A-Version Project Number End User's Name Site Address FläktGroup Contact Section A: For completion by commissioning engineer for each unit on site before starting commissioning. Check installation complies with Operation Manual & Approved Code of Practice-DX Installations Initial Box = Check &...
Page 136 Appendix Multi-DENCO ® -DENCO Commissioning Record A-Version Controls - Continued Cooling Dead Zone Cooling Proportional Band °C °C Heating Dead Zone °C Heating Proportional Band °C Humidity Dead Zone Humidity Proportional Band % RH % RH Dehum Dead Zone % RH...
Page 137 Multi-DENCO Appendix ® -DENCO Commissioning Record A-Version Low Pressure Hot Water Heating Option Fitted? Yes/No LPHW Water Inlet Temperature °C LPHW Water Outlet Temperature °C Heating Function Checked Control Valve Type Yes/No Ports Option Fitted? Humidifier Yes/No L1 Humidifier Current...
Page 138: Multi-Denco Commissioning Report C-Version
Appendix Multi-DENCO 13.4 Multi-DENCO Commissioning Report C-Version ® -DENCO Commissioning Record Cover Sheet: For completion by the project's Contract Engineer (1 sheet per model or variant per site) All information to be completed before hand-over to Commissioning Engineer Contract's Engineer Date Required &...
Page 139 Multi-DENCO Appendix ® -DENCO Commissioning Record C-Version Project Number End User's Name Site Address FläktGroup Contact Section A: For completion by commissioning engineer for each unit on site before starting commissioning. Check installation complies with Operation Manual and Approved Code of Practice-CW Systems Initial Box = Confirm signed Pressure Test Certificate has been issued by installer.
Page 140 Appendix Multi-DENCO ® -DENCO Commissioning Record C-Version Fan Check List Fan motor currents checked Yes/No Fans free from vibration at all speeds Yes/No Max Fan Speed Setting Measured Air Volume Min Fan Speed Setting Measured Air Volume Dehum Fan Speed...
Page 141 Multi-DENCO Appendix ® -DENCO Commissioning Record C-Version Notes: Commissioning Engineers Full Name Date Commissioning Engineers Signature Page 4 of 4 Based on DQA801 FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020...
Page 142 Multi-DENCO FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020...
Page 143 Multi-DENCO FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020...
Page 144 WWW.FLAKTGROUP.COM MULTI-DENCO FläktGroup is the European market leader for smart and energy efficient Indoor Air and Critical Air solutions to support every application area. We offer our customers innovative technologies, high quality and outstanding performance supported by more than a century of accumulated industry experience. The widest product range in the market, and strong market presence in 65 countries worldwide, guarantee that we are always by your side, ready to deliver Excellence in Solutions.

FläktGroup Multi-DENCO Operation Manual

Quick Links

Related Manuals for FläktGroup Multi-DENCO

Summary of Contents for FläktGroup Multi-DENCO

Table of Contents