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Mitsubishi Electric MEGR Manual

Air conditioners for it cooling
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Air conditioners for IT Cooling
MEGR
INSTALLATION, USE AND MAINTENANCE MANUAL
English
English
Italian is the original language.
The other languages versions are translation of the original.
To ensure safe and correct use, carefully read this manual and make sure to understand all the contained indications
and information.
MEHITS S.p.A.

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  • Page 1 Air conditioners for IT Cooling MEGR INSTALLATION, USE AND MAINTENANCE MANUAL English English Italian is the original language. The other languages versions are translation of the original. To ensure safe and correct use, carefully read this manual and make sure to understand all the contained indications and information.
  • Page 2 Before carrying out any operation on the machine, you must carefully read this manual and make sure you understand all the instructions and information given. Keep this manual in a known and easily accessible place to refer to as necessary during the entire life-span of the unit. This Manual has been prepared by MEHITS S.p.A.: Reproduction, even partial, of this booklet is prohibited.

  • Page 3: Table Of Contents

    Auxiliary electrical connections with the internal unit ....................31 .............................. 32 PTIONAL INSTALLATION 4.6.1 Vertical air flow................................32 4.6.2 Lifting and rotation hooks for MEGR-MC ........................34 4.6.3 Lifting and rotation hooks for MEGR-TF ........................38 4.6.4 Earthquake anchoring kit only for MEGR-MC ......................40 4.6.5 Cooling/electrical connections in seismic areas ......................
  • Page 4 ............................40 EFORE STARTING THE UNIT START ....................41 ..............................41 ACHINE START METHOD OF USE .................. 41 ..........................41 ROVISIONS AND WARNINGS FOR USE ............................... 41 MERGENCY STOP ........................41 ROLONGED SHUTDOWNS OF THE MACHINE ......................42 TART UP AFTER EXTENDED MACHINE INACTIVITY FIRST DIAGNOSTICS ................

  • Page 5: General Provisions

    1 GENERAL PROVISIONS 1.1 General information and safety 1.1.1 Scope of the manual This manual, which is an integral part of the machine (*), was prepared by the Manufacturer to provide the necessary information to all those who are authorised to interact with it during its life span: Buyers, System Designers, Carriers, Handling Operators, Installers, Expert Operators, Specialist Technicians and Users.

  • Page 6: Symbols

    2 SYMBOLS DANGER: Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. WARNING: Warning indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. ATTENTION: Attention indicates a potentially hazardous situation which, if not avoided, could cause minor or moderate damage.

  • Page 7: Glossary And Terminology

    3 GLOSSARY AND TERMINOLOGY There are some recurring terms in the manual which are described below in more detail. Manufacturer: this is the company that has designed and built the machine in line with current laws, implementing all the good construction rules, and paying attention to the health and safety of people interacting with the machine.

  • Page 8: Attached Documentation

    3.1 Attached documentation The following documents are delivered with the unit: • Installation, use and maintenance manual: it contains the list of operations to carry out. • Wiring diagram: it is specific to the machine in question. It is useful for the persons who will have to carry out work on the electrical system, as it shows the various components and connections.

  • Page 9: Precautions Against Residual Risks

    Only use the machine with the safety devices properly installed and in perfect working order. Failure to observe this requirement could result in serious risks to the health and safety of the persons involved. Keep the machine in perfect working order and perform the routine maintenance recommended by the manufacturer. Good maintenance can help to ensure the best possible performance, a long useful life and constant compliance with the safety requirements.
  • Page 10 Prevention of environmental risks • The machine contains substances and components that are dangerous for the environment, such as refrigerant gases and lubricant. • The units may only be serviced and disposed of by qualified technicians. • Refrigerant gas: The cooling circuit contains fluorinated greenhouse gases covered by the Kyoto Protocol. The fluorinated greenhouse gases contained in the cooling circuit must not be disposed of in the atmosphere.

  • Page 11: List Of Machine Internal Symbols

    • it is not permitted to walk or rest other objects on the machines • the user is responsible for overall evaluation of the risk of fire in the place of installation (for example, calculation of the fire load) • during transport, always secure the unit to the bed of the vehicle to prevent it from moving about and overturning •...

  • Page 12: Machine Identification

    The alphanumerical code of the model of the machine, which is given on the identification plate, represents precise technical specifications which are indicated in the figure. Model: MEGR-MC-SL-A 015 MEGR R410A remote capacitors Coil type MC = Microchannel exchanger TF = Cu/Al exchanger...

  • Page 13: Storage Temperature

    3.3 Storage temperature During transport and if the machine is not installed at the reception, do not remove the packaging and place the machine in an enclosed, dry and protected from sunlight site at temperatures ranging between -40°C and 60°C in absence of superficial condensation.

  • Page 14: Description Of The Main Components

    3.5 Description of the main components Air-cooled condensers for IT Cooling equipped with axial fans with horizontal or vertical air flow. Air flow from coil to fan. The design solution allows a high degree of application flexibility. There are 4 series with 12 models each. Between the internal unit and the condenser, it is necessary to make the cooling and electrical connection of the condensation control proportional signal and of the alarms.

  • Page 15: Electrical Panel

    3.5.1 Electrical panel The power supply is independent of the internal unit. The electrical panel is installed on the machine and is fitted with a line disconnector. In accordance with the standard EN 60204-1, the handle of the circuit breaker must be easy to access and at a height of between 0.6 and 1.9 metres above the floor.

  • Page 16: Transport, Storage And Installation

    4 TRANSPORT, STORAGE AND INSTALLATION 4.1 Transport and moving 4.1.1 Storage Place in a protected environment, where there is no wind or condensation. Secure the machine in place so that there is no risk of overturning. 4.1.2 Transport For road transport it is advisable to use a low loader truck with tarpaulin or in any case to use a tarpaulin to protect the units against bad weather.

  • Page 17: Discharge

    4.1.3 Discharge Lift and move the machine as indicated on the packaging and/or directly on the machine. It is advisable NOT TO REMOVE the shrink wrap protection during the unloading, handling and positioning operations. OBLIGATION: All the unloading, handling and positioning operations must be carried out using appropriate means and by experience personnel, trained and authorised for such activities.

  • Page 18: Disassembly Of The Machine Panels

    4.2 Disassembly of the machine panels DANGER: The machine panelling is made of heavy aluminium sheet. All the assembly and disassembly operations must be carried out using suitable means and by experienced individuals, trained and authorised for these types of operations. Machine panels The side panels can be removed.

  • Page 19: Installation

    4.3 Installation INFORMATION: For the installation / commissioning / positioning of units containing R32, depending on the amount of refrigerant, check the regulatory requirements that must be met for the installation site. 4.3.1 Installation of the standard machine OBLIGATION: All the phases of installation must be covered in the general project. Before starting the installation of the machine, in addition to defining the technical requirements, the person authorised to perform the work must, if necessary, implement a "safety plan"...

  • Page 20: Machine Positioning

    OBLIGATION: The machine must be placed in an area only accessible by OPERATORS, MAINTENANCE PEOPLE and TECHNICIANS; if this is not possible, it must be surrounded by a fence that is at least two metres from the external surface of the machine (if possible). The staff of the INSTALLER or any other visitors must always be accompanied by an OPERATOR.

  • Page 21: Fixing The Machines To The Ground

    4.3.3 Fixing the machines to the ground The machines must be fixed to the ground or to the support structure. The support feet are provided with holes for fixing as shown in the figure. Fixing systems are not supplied. HORIZONTAL AIR FLOW VERTICAL AIR FLOW Installation, use and maintenance manual...

  • Page 22: Installation Clearances

    4.3.4 Installation clearances OBLIGATION: For a correct installation of the machine, it is necessary to ensure a free area around the same, as shown in the figure. This allows correct air circulation and ease of access to the components of the machine for the purpose of normal inspection and maintenance operations.

  • Page 23: Installation And Position Of Any Obstacles

    4.3.5 Installation and position of any obstacles OBLIGATION: The air expelled from the machine must be easily dispersed into the environment. Avoid the presence of obstacles that may cause the expelled air to recirculate. Structures around the installation perimeter must ensure the free movement of air such as: finned barriers, finned barriers with sound-proofed passages.

  • Page 24: Installation In Places With Heavy Snowfall

    4.3.6 Installation in places with heavy snowfall Snow can accumulate around and above the machine and low outside temperatures can freeze the snow in blocks of ice that block the fan grille or the coil. This condition may cause a malfunction or breakage of the machine. Check and keep the machine clear of snow.

  • Page 25: Speed Of The Coolant In The Pipes

    OMEGA compensator LYRA compensator 4.4.3 Speed of the coolant in the pipes OBLIGATION: The designer of the plant is responsible for the precise sizing of the pipes in accordance with the speed of the fluid in the pipes as shown below. Circuit line Minimum Speed (m/s) Maximum Speed (m/s)

  • Page 26: Diameters Of The Machine Cooling Connections

    4.4.6 Diameters of the machine cooling connections MICROCHANNEL EXCHANGER STANDARD MODEL A - Length 1220 1220 1430 2110 B - Width H - Height 1100 1100 COOLING CONNECTIONS Liquid – ODS Ø mm Gas - ODS Ø mm STANDARD MODEL A - Length 2110 2670...

  • Page 27: Installation Diagram

    4.4.7 Installation diagram OBLIGATION: The pipes must have the indicated slopes, to facilitate the return of the lubricating oil to the compressor. Apply the diagram to each refrigerant circuit of the unit. Height difference between machine and remote condenser: value expressed in equivalent length. Legend: 1.

  • Page 28: Connection Of The Cooling Pipes To The Machine

    WARNING: It is necessary to integrate the refrigerant and lubricating oil charge for the connection pipes and for the remote air-cooled condenser. For the quantities requiring reintegration, refer to the internal unit manual. 4.4.8 Connection of the cooling pipes to the machine Ball valves for cooling line.

  • Page 29: Coolant Charge

    4.4.8.2 Connection of the pipes and fittings of the cooling line • The junction is for strong brazing with silver-based alloy (an alloy with medium-high silver content and low melting temperature is recommended). • Use appropriate equipment. • Before brazing, clean the pieces to remove oil, grease, oxides, scale and dirt. •...

  • Page 30: Electrical Connections

    4.5 Electrical connections The electrical connections of the machine must be defined during the system design DANGER: The electrical connections must only be designed and completed by personnel with precise technical competence or particular skills in the field of activity. Before proceeding, personnel must disconnect all power supply sources, making sure that no one may inadvertently re-connect them.

  • Page 31: Electrical Panel

    FMC electronic board - to be connected to the internal unit. VERSION WITH AC ELECTRIC MOTORS - MEGR-A series FMC electronic board for fan rotation speed control. In case of power failure and malfunction, the board sends a digital alarm signal to the internal unit (refer to the wiring diagrams).

  • Page 32: Optional Installation

    Remove the panels to access the power supply box Junction box for power supply input SEGNALE 43 – 2 → segnale 0-10V 101 – 1 → relè allarme 4.6 Optional installation 4.6.1 Vertical air flow The accessory is only available for machines equipped with 1/2/3 fans. The units can be supplied with support feet to obtain a vertical airflow.
  • Page 33 4.6.1.1 Support feet for vertical air flow OBLIGATION: • Carefully carry out all handling operations to avoid damaging the coil and fans. • Large machines are equipped with eyebolts to facilitate lifting. • The version with vertical air flow is subject to all the regulations and instructions contained in this manual.

  • Page 34: Lifting And Rotation Hooks For Megr-Mc

    4.6.2 Lifting and rotation hooks for MEGR-MC The types of supports for lifting and rotating the machine can be of 3 types, depending on the size and number of fans of the machine itself. The machines are supplied with lifting eyebolts.
  • Page 35 TYPE 2 ROTATION LIFTING Installation, use and maintenance manual...
  • Page 36 TYPE 3 ROTATION LIFTING OBLIGATION: All the unloading, handling and positioning operations must be carried out using appropriate means and by experience personnel, trained and authorised for such activities. Keep the machine on the pallet for unloading and handling operations. Installation, use and maintenance manual...
  • Page 37 LENGTH OF SLING BAR L HEIGHT FROM SLING BAR H OBLIGATION: The sling bar length 'L' must never be less than the length of the machine. Ensure that the distance 'H' between the machine and the sling bar is greater than 1.1 metres. Installation, use and maintenance manual...

  • Page 38: Lifting And Rotation Hooks For Megr-Tf

    4.6.3 Lifting and rotation hooks for MEGR-TF The types of supports for lifting and rotating the machine can be of 3 types, depending on the size and number of fans of the machine itself. TYPE 1 ROTATION LIFTING TYPE 2...
  • Page 39 TYPE 3 MACHINE LIFTING ROTATION KIT DOUBLE MOBILE UNIT LIFTING OBLIGATION: All the unloading, handling and positioning operations must be carried out using appropriate means and by experience personnel, trained and authorised for such activities. Keep the machine on the pallet for unloading and handling operations. LENGTH OF SLING BAR L HEIGHT FROM SLING...

  • Page 40: Earthquake Anchoring Kit Only For Megr-Mc

    4.6.4 Earthquake anchoring kit only for MEGR-MC Where seismic installations are planned, the machines must be installed in a suitable manner: Avoid installations with vertical air flow. Pay particular attention to the anchoring to the support structure (refer to the technical manual).

  • Page 41: Start

    6 START 6.1 Machine start-up Commissioning must be carried out by a specialist Engineer, in the presence of the Installer and an experienced Operator. The specialist Engineer will test the equipment, carrying out checks, calibrations and commissioning according to the applicable procedures falling under their responsibility.

  • Page 42: Start-Up After Extended Machine Inactivity

    7.4 Start-up after extended machine inactivity Before starting the machine, carry out all the maintenance activities. The specialist Engineer must also carry out adequate checks, calibrations and the start-up procedure. 8 FIRST DIAGNOSTICS 8.1 Troubleshooting … List of actions to be taken in case of machine fault. Fault Cause Solution...

  • Page 43: Maintenance

    9 MAINTENANCE 9.1 Maintenance instructions OBLIGATION: Both regular and extraordinary maintenance activities must be carried out by AUTHORISED TRAINED INDIVIDUALS equipped with all the necessary personal protective equipment. The machine site of installation must meet all the safety requirements The procedures set by the Manufacturer must be followed. Before any kind of maintenance is carried out the following measures must be observed: •...

  • Page 44: Table Of General Maintenance Jobs

    9.3 Table of general maintenance jobs WORK INTERVALS Start of Start of season season WORK TO BE CARRIED OUT Every day every 500 every 1000 hours or 2 hours or 3 months months  Check any alarms.  Visually check for coolant leaks ...

  • Page 45: Cu-Al "Tube And Fin" Coils

    DANGER: The aluminium fins are thin and sharp. Make sure to always wear appropriate PPE to avoid cuts and abrasions. Protect the eyes and face against the spraying of water and dirt during the cleaning process. Wear waterproof shoes or boots and clothes that cover all the body.

  • Page 46: Microchannel Coils

    Supplementary maintenance. The particular feature of the coating is the fact that it can be reapplied. Solid particles (like sand) can enter from the side of the coil where air flows in, and erode the corrosion protection exposing the metal. Should this happen, the surface coating must be reapplied. Reapplication should be carried out by qualified personnel.

  • Page 47: Extraordinary Maintenance

    Approved detergent for e-coated coils: Product Retailer Code Enviro-Coil Concentrate HYDRO-BALANCE CORPORATION H-EC01 Enviro-Coil Concentrate Home Depot Supply H-EC01 Enviro-Coil Universal Coil Cleaner Advanced Engineering 9.5 Extraordinary maintenance If repairs are needed, contact a Service Centre authorized by the manufacturer. INFORMATION: Failure to comply with the above will make the warranty null and void and relieve the manufacturer of all safety related responsibilities.

  • Page 48: Disposal Of The Machine

    10 DISPOSAL OF THE MACHINE Contact a Service Centre authorised by the Manufacturer to arrange for disposal of the machine. OBLIGATION: When components are replaced, or when the entire machine is removed from the installation at the end of its useful life, the following requirements must be observed to minimise impact on the environment: •...
  • Page 49 Installation, use and maintenance manual...
  • Page 50 Via Caduti di Cefalonia 1 – 36061 Bassano del Grappa (VI) - Italy IUM_MEGR_00_Z_07_22_EN...

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