Mitsubishi Electric e Series Installation & Operation Manual
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Mitsubishi Electric e Series Installation & Operation Manual

Mitsubishi Electric e Series Installation & Operation Manual

Water-cooled chilling unit
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e-series
Water-cooled Chilling Unit
Installation/Operation Manual
ERCV-M900YA
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Safety Precautions.......................................................................... 2
1. Selecting the Installation Site...................................................... 9
2. Unit Installation ......................................................................... 12
3. Water Pipe Installation.............................................................. 15
4. Electrical Wiring Installation...................................................... 23
5. System Configurations.............................................................. 33
6. Troubleshooting ........................................................................ 62
7. Operating the Unit..................................................................... 69
8. Main Specifications................................................................... 77
9. Maintenance ............................................................................. 81
For use with R32
CONTENTS
<ORIGINAL>
ERCV

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  • Page 1: Table Of Contents

    <ORIGINAL> e-series ERCV Water-cooled Chilling Unit For use with R32 Installation/Operation Manual ERCV-M900YA CONTENTS Safety Precautions................2 1. Selecting the Installation Site............9 2. Unit Installation ................. 12 3. Water Pipe Installation.............. 15 4. Electrical Wiring Installation............23 5. System Configurations.............. 33 6.

  • Page 2: Safety Precautions

    Forcing the unit to operate the unit by defeating the safety features of the devices such as the pressure switch or the temperature switch, making unauthorized changes to the switch settings, or using accessories other than the ones recommended by Mitsubishi Electric may result in smoke, fire, or explosion.
  • Page 3 This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety. Keep the space well ventilated.
  • Page 4 To reduce the risk of injury, wear protective gear when working on the unit. Do not release refrigerant into the atmosphere. Collect and reuse the refrigerant, or have it properly disposed of by an authorized agency. Refrigerant poses environmental hazards if released into the air. To prevent environmental pollution, dispose of brine in the unit and cleaning solutions according to the local regulations.

  • Page 5: Pipe Installation

    Properly dispose of the packing materials. Plastic bags pose suffocation hazard to children. The unit should be installed only by personnel certified by Mitsubishi Electric according to the instructions detailed in the Installation/Operation Manual. Improper installation may result in refrigerant leakage, water leakage, injury, electric shock, or fire.

  • Page 6: Electrical Wiring

    CAUTION Check that no substance other than the specified refrigerant (R32) is present in the refrigerant circuit. Infiltration of other substances may cause the pressure to rise abnormally high and cause the pipes to explode. Piping work should be performed by the dealer or qualified personnel according to the instructions detailed in the Installation Manual.
  • Page 7 Transportation and repairs WARNING The unit should be moved, disassembled, or repaired only by qualified personnel. Do not alter or modify the unit. Improper repair or unauthorized modifications may result in refrigerant leakage, water leakage, injury, electric shock, or fire. After disassembling the unit or making repairs, replace all components as they were.
  • Page 8 To ensure proper operation of the unit, periodically check for proper concentration of anti- freeze. Inadequate concentration of anti-freeze may compromise the performance of the unit or cause the unit to abnormally stop. Take appropriate measures against electrical noise interference when installing the air conditioners in hospitals or facilities with radio communication capabilities.

  • Page 9: Selecting The Installation Site

    1. Selecting the Installation Site [1] Installation Conditions Select the installation site in consultation with the client. This product is for exclusive use in a machine room with a ventilation equipment. Select a site to install the unit that meets the following conditions: •...
  • Page 10 [2] Installation Space Requirement <1> Unit installation (1) Required space (Unit: mm) (SERVICE SPACE) (SERVICE SPACE) (SERVICE SPACE) SERVICE SIDE (SERVICE SPACE) (780) 1000 1500 (1290) <FRONT VIEW> <TOP VIEW>...
  • Page 11 This unit is for exclusive use in a machine room with ventilation equipment. As shown in the figure below, install the unit in a machine room with ventilation equipment. *The requirements listed below were established based on IEC60335-2-40 (ver.6) and ISO5149 (2014). Good (Continuously) Mechanical ventilation...

  • Page 12: Unit Installation

    2. Unit Installation Units should be installed only by personnel certified by Mitsubishi Electric. [1] Product suspension method Protective pads 6 m or longer × 2 ropes (3 m or longer × 4 ropes) 1.8 m or more Unit Use protective pads where the unit Plate suspension fittings comes in contact with the shackles.

  • Page 13: Center Of Gravity Position

    [2] Center of gravity position The center of gravity position is shown with the mark. (Unit: mm) 1290 <Service side> <Right side> (Unit: mm) Model ERCV-M900YA...
  • Page 14 [3] Installation on foundation • Securely fix the unit with bolts to keep the unit from falling down during earthquakes. • Install the unit on a foundation made of concrete or iron. • Noise and vibrations from the unit may be transmitted through the floor and walls. Provide adequate protection against noise and vibration.

  • Page 15: Water Pipe Installation

    3. Water Pipe Installation [1] Schematic Piping Diagram and Piping System Components <1> Water circuit Please build the condensation side and evaporation side water circuits so that it is a closed system. Do not use water directly for showers or other applications. Do not allow other heat source water to mix with the water circuit.
  • Page 16 [2] Water piping attachment Evaporation side water inlet Condensation side water outlet The dimension of the groove pipe at the chiller side Condensation side Evaporation side water outlet water inlet <Opposite side of service side> Victaulic standard groove specifications (Unit: mm) Pipe size 2-1/2B (65A) ø76.1...
  • Page 17 [3] Notes on Pipe Corrosion Water treatment and water quality control Poor-quality circulating water can cause scale build-up and corrosion in the water-side heat exchanger, reducing heat-exchange performance. Properly control the quality of the circulating water. • Removing foreign objects and impurities in the pipes During installation, keep foreign objects, such as welding and sealant fragments and rust, out of the pipes.
  • Page 18 (5) Suspended solids in the water Sand, pebbles, suspended solids, and corrosion products in water can damage the heating surface of the heat exchanger and cause corrosion. Install a good quality strainer (20 mesh or more) at the inlet of the unit to filter out suspended solids.
  • Page 19 [4] Installing the Strainer and Flow Switch <1> Installing the strainer Install a strainer on the inlet pipe near the unit to filter out suspended solids and prevent clogging or corrosion of the heat exchanger. Install a strainer in a way that allows for easy access for cleaning, and instruct the user to clean it regularly. Operating the units with a clogged strainer may cause the units to make an abnormal stop.
  • Page 20 [5] Installing the external water temperature sensor <1> Parts that are required to install an external water Wire specifications temperature sensor Wire size 2-core cable Min. 1.25 mm (1) External water temperature sensor Type CVVS or CPEVS (2) Wiring to connect the sensor and the unit* Maximum length 20 m (3) Wiring terminals to connect the wiring to the sensor and the terminal block on the unit...
  • Page 21 [6] Ensuring enough water in the water circuit <1> Required amount of water (for single unit) If the amount of water in the water circuit (circulating water circuit) is insufficient, the unit operation hours may become shorter or the amount of water temperature change to be controlled may become extremely large. Refer to the table below for the minimum amount of water required in the circuit.
  • Page 22 [7] Water Piping Size and Location (Unit: mm) Evaporation side water inlet 65A housing type joint Condensation side water outlet 65A housing type joint Evaporation side water outlet 65A housing type joint Condensation side water inlet 65A housing type joint <Opposite side of service side>...

  • Page 23: Electrical Wiring Installation

    4. Electrical Wiring Installation [1] Main Power Supply Wiring and Switch Capacity Schematic Drawing of Wiring (Example) A: Switch (with current breaking capability) 3N~380–415V B: Current leakage breaker C: Unit Main power supply wire size, switch capacities, and system impedance Local switch (A) Minimum wire size (mm Max.

  • Page 24: Cable Connections

    [2] Cable Connections <1> Schematic Diagram of a Unit and Terminal Block Arrangement (Unit: mm) ø34 Control wiring under 24VAC Control box ø34 Control wiring over 100VAC ø66 Power supply wiring Panel B Panel A <Service side> <Unit top> Detailed drawing Panel A Power supply terminal box Panel B...
  • Page 25 <2> Precautions when fastening screws * Faulty contacts due to loose screws may cause overheating and fire. * Using the circuit board while it is damaged may cause overheating and fire. 1 Screw fastening torque Power supply terminal block, M8 screw: 10 to 13.5 N·m Use the following methods to check that the screws have been fastened.
  • Page 26 ERCV-M900YA ELECTRICAL WIRING DIAGRAM PS BOARD (POWER BOARD) POWER SUPPLY BLUE CN101 3N~ 50Hz/60Hz 380/400/415V CN100 X300 POWER SUPPLY L1 L2 L3 Ground CNDC CIRCUIT WHITE 63HA HIGH CN202 IPM POWER SUPPLY VOLTAGE WHITE CIRCUIT SWITCH M-NET L1 L2 L3 CN303 X300 POWER SUPPLY...
  • Page 27 IT TERMINAL 1 2 3 4 5 CN600 CN605 CN4C CNIT WHITE WHITE BLACK BLACK WHITE CNLVA LEVA _ M WHITE ELECTRONIC EXPANSION VALVE CONTROL BOARD CNPW WHITE (MAIN BOARD) LED301 CN110 BLACK CNLVD LEVB _ M YELLOW CN604 ELECTRONIC SWU2 SWU1 GREEN EXPANSION...
  • Page 28 Note1. The broken lines indicate the optional parts, field-supplied parts, and field work. Note2. Dashed lines indicate terminal box. Note3. The control box has many parts charged with high voltage in it. Before inspecting the inside of the control box, be sure to turn off the power supply and leave it alone for at least 10 minutes and then confirm that the voltage connector RYPN declined sufficiently (to 20 VDC or less).

  • Page 29: External Input/Output

    When using a local controller, refer to the table below for the types of input/output signals that are available and the operations that correspond to the signals. External Input/Output Input Dry contact ON (Close) OFF (Open) Terminal block type (a) EVAPORATION Normal/Error The unit is allowed to operate.
  • Page 30 Output Contact type Conditions in which the contact closes Conditions in which the contact opens Terminal block (turns on) (turns off) type (q) OPERATION Close/Open The "UNIT OPERATION" contact (item (e) above) The "UNIT OPERATION" contact (item (e) K31-K32 INDICATOR or the ON/OFF button on the remote controller is above) or the ON/OFF button on the remote (From system leader...
  • Page 31 Input and output correspondence table When wiring on site, check the operation during the commissioning. Terminal block System leader Group leader SUB unit unit unit Evaporation side water K01-K02 Normal Error pump interlock Condensation side water K01-K03 Normal Error pump interlock Evaporation side water K23-K24 Normal...

  • Page 32: External Signal Interface

    External signal interface Optional remote controller Centralized controller (PAR-W31MAA) Evaporation side (Normal/Error) water pump interlock M-NET Transmission line Condensation side (Normal/Error) water pump interlock Evaporation side water (Normal/Error) Operation display output flow switch (From system leader unit/ (Run/Stop) Individual unit) Error display output Anti freeze (ON/OFF)

  • Page 33: System Configurations

    5. System Configurations The system must be configured only by personnel certified by Mitsubishi Electric. [1] Schematic Diagrams of Individual and Multiple Units Connection Systems (1) Individual system External temperature sensor 2 (option) Flow switch MAIN Pump interlock Field-supplied dry contact...
  • Page 34 [2] Switch Types and the Factory Settings (1) Switch names and functions Control box <Service side> There are three main ways to set the settings as follows: 1Dip switches (SW4 - SW7) 2Dip switches used in combination with the push switches 3Rotary switches See below for how these switches are used to set certain items.
  • Page 35 Different types of switches on the PCB [Control board] [Enlarged view of operation area] Push switch Operation area (SWP1) Push switch (SWP2) Push switch (SWP3) LED display Rotary switch (SWU2) (0-9) Rotary switch (SWU1) (0-9) Dip switch (SW7) Dip switch (SW6) Dip switch (SW5) Dip switch (SW4) Initial Setting...
  • Page 36 ® * Connection to a BMS requires an installation of Procon A1M/A1M+ (MODBUS interface), which is available from MITSUBISHI ELECTRIC UK. Use a BMS with insulation. * Use the following recommended products or similar products for the outdoor temperature thermistor.

  • Page 37: Configuring The Settings

    [3] Configuring the Settings The settings must be set only by a qualified personnel. <1> System configuration (1) Set the dip switches. Switch settings on the MAIN circuit MAIN circuit board Set the dip switches (labeled A in the figure at right) that correspond to the items below, according to the local system.
  • Page 38 Setting the switches on the system leader unit Make sure the address of the MAIN circuit on the main module is set to "1" Main circuit board (labeled A in the figure at right). Setting the switches on the group leader unit MAIN circuit Set the MAIN circuit addresses with the rotary switches.
  • Page 39 Selector switch settings [ON] Unit operation [Remote] Controller operation [OFF] Unit stop [Local] Local operation Remote Local CAUTION • Do not open the terminal cover, when selector switches are operated. Display LED display Power light LED display Push switch Error light Run light LED display The positions of the selector switch and the display...
  • Page 40 Priority order of the water-temperature-setting-input-signal sources Water temperature can be controlled by using the signals from the four types of input sources listed below. The setting for the item with higher priority will override the settings for the items with lower priorities. The water temperature will be controlled according to the temperature setting in the "Target water temperature"...
  • Page 41 Priority order of the operation signal sources Input from centralized Remote controller No-voltage contact PAR-W31MAA controller or BMS Unit operation (Run/Stop) The last setting has priority. Cooling *1 The last setting has priority. Cooling ECO can not be set from the remote controller or the Cooling ECO *1*2 centralized controller.

  • Page 42: Making The Settings

    <2> Making the settings Use the LED display and the three push switches (SWP1 (↑), SWP2 (↓), and SWP3 (Enter)) to change the current settings on the circuit board and to monitor various monitored values. (1) Setting procedures Take the following steps to set the push switches SWP1 through SWP3. These switches must be set after the dip switch SW4 has been set.
  • Page 43 (2) Table of settings items Set dip switches SW7-1, SW7-2, and SW4 as shown in the table below to set the value for the items in the "Setting item" column. Need or non-need to set the setting *5 switch Dip switch setting (SW4) *2 Setting Item Default System Group Notes...
  • Page 44 Need or non-need to set the setting *5 switch Dip switch setting (SW4) *2 Setting Item Default System Group Notes setting *1 SW7-1 Preset temp. A (Cooling) *3 4ºC Range 4–30ºC 9 10 SW7-1 Preset temp. B (Cooling) *3 30ºC Range 4–30ºC 9 10 SW7-1...
  • Page 45 Outlet water temperature Thermo-ON temperature changes 1 Cooling*1 Thermo-differential 1 Outlet water temperature Preset water (Cooling mode): 3°C changes-2 temperature (Default) Target temp. Thermo-differential 2 (Cooling mode): 2°C (Default) When the water temperature is controlled based on the outlet water Thermo-OFF temperature temperature, compressor frequency will be controlled in the...

  • Page 46: Setting Procedures

    <3> Setting procedures (1) System setting 1. Making the settings for the initial start-up process (A) Single unit Setting address 1 Turn off the power. Address [1] System leader unit (Address 1 SW5-2, 5-3: ON) System leader unit Turn the power back on. Address 1 →...
  • Page 47 (C) System leader unit and group leader unit (3 groups, 1 unit in each group) Address [1] System leader unit Remote controller Address [2] Group leader unit Address [3] Group leader unit 1 Setting address 1 2 Setting address 2 Turn off the power.
  • Page 48 (D) System leader unit, Group leader unit and Sub unit (2 groups, 3 units in each group) Address [1] Address [2] Address [3] System leader unit Sub unit Sub unit Remote controller Address [4] Address [5] Address [6] Group leader unit Sub unit Sub unit 1 Setting address 1...
  • Page 49 2. Multiple unit control By setting SW5-6 to ON for address 1, optimum control of number of operating units will be performed. All units will simultaneously operate when SW5-6 is set to OFF. (A) System leader unit, group leader unit, and sub unit Address [1] Address [2] Address [3]...
  • Page 50 3. Example of system configuration Optimum control of number of operating units Address [1] Address [2] Address [3] Address [4] Address [5] Address [6] Group leader Group leader Group leader Group leader Group leader System leader unit unit unit unit unit unit PAR-W31MAA...

  • Page 51: Settings Table

    (2) Water-temperature setting Different water temperature settings can be set for different modes. Set the dip switches on the circuit board as follows to make the settings for the items described in this section. Press the push switch SWP3 to enable the configuration changes. Press the push switches SWP1 (↑) or SWP2 (↓) to increase or decrease the value.
  • Page 52 *1 Only the switches designated in the table must be set to ON. (The other switches must be OFF.) *2 Temperature setting increments: 0.5ºC *3 No-voltage contact KN51-KN61: OFF *4 No-voltage contact KN51-KN61: ON *5 Maximum 60°C. When the target water temperature exceeds 55°C and the Efficiency priority mode (No-voltage contact K91-93: ON) is enabled, the maximum temperature for this setting will be limited to 55°C.
  • Page 53 • External analog input signal of 4 mA: Lower limit • External analog input signal of 20 mA: Upper limit • External analog input signal of between 4 and 20 mA: the preset temperature will be linearly interpolated. Upper limit Lower limit 4 mA 20 mA...
  • Page 54 (3) Peak-demand control operation Peak-demand control is a function used to control the power consumptions of the units. The compressor's maximum operating frequency will be controlled according to the peak-demand control signal. Set the dip switches on the circuit board as follows to make the settings for the items described in this section. Press the push switch SWP3 to enable the configuration changes.
  • Page 55 (5) Setting the water temperature using analog signal input When dip switch SW5-7 is set to ON (Enable external input), SW5-8 is set to OFF, and SW5-9 is set to OFF, the target water temperature varies with the preset temperatures A and B and the type of analog input signal. Set the dip switches on the circuit board as follows to make the settings for the items described in this section.
  • Page 56 • When the water temperature setting input signal type is 4-20 mA • External analog input signal of 4 mA: Preset temp. A • External analog input signal of 20 mA: Preset temp. B • External analog input signal of between 4 and 20 mA: the preset temperature will be linearly interpolated. Preset temp B Preset temp A 4 mA...
  • Page 57 (6) Setting the capacity control ratio using analog signal input When dip switch SW5-7 is set to ON (Enable external input), SW5-8 is set to ON, and SW5-9 is set to OFF, the capacity control ratio varies with the type of analog input signal. •...
  • Page 58 • When the capacity control setting input signal type is 2-10 V • External analog input signal of 2 V: 0% • External analog input signal of 10 V: 100% • External analog input signal of between 2 and 10 V: the percent will be linearly interpolated. Load ratio 100% 10 V...
  • Page 59 (7) Setting the supplementary heater signal output conditions A temperature at which the signal output to operate supplementary heaters can be selected. Supplementary heater signal output conditions The operation command signal is ON and at least one of the following two conditions is met. 1 Water-temperature control option (SW5-4) is set to OFF, the inlet water temperature drops below a set water temperature.
  • Page 60 (8) External temperature sensor control An optional External temperature sensor (TW-TH16) is required. Outlet water Simultaneous System operating group Sub unit Sub unit leader External unit temperature sensor 2 SW5-5 ON (TH13) SW5-4 ON SW5-4 ON SW5-4 ON (SW5-5 ON) Simultaneous Identical water Group...

  • Page 61: Demand Operation

    (9) Demand operation The demand function can reduce the power consumption. Single unit control In the case of single unit control, the unit is operated up to the specified demand limit. Group Group System leader leader leader unit unit unit Multiple unit control In the case of multiple unit control, the number of operating units are limited by demand value.

  • Page 62: Troubleshooting

    6. Troubleshooting Troubleshooting must be performed only by personnel certified by Mitsubishi Electric. [1] Diagnosing Problems for which No Error Codes Are Available If a problem occurs, please check the following. If a protection device has tripped and brought the unit to stop, resolve the cause of the error before resuming operation.
  • Page 63 [2] Diagnosing Problems Using Error Codes If a problem occurs, please check the following before calling for service. (1) Check the error code against the table below. (2) Check for possible causes of problems listed in the "Cause" column that correspond to the error code. (3) If the error codes that appear on the display are not listed in the table below, or no problems were found with the items listed in the "Cause"...
  • Page 64 Error reset *2 Error Cause Cause Operation SW Error type code *1 (Installation/Setting error) (Parts problems) Selector Remote switch controller Discharge temperature fault No water • High-pressure sensor fault (A discharge refrigerant temperature of 120ºC or Abrupt change in water temperature •...
  • Page 65 Error reset *2 Error Cause Cause Operation SW Error type code *1 (Installation/Setting error) (Parts problems) Selector Remote switch controller Inverter Faulty wiring • INV board fault error THHS sensor/circuit fault • INV board fault 5114 Serial communication error • Communication error between control 0403 board and INV board (noise interference, broken wiring)
  • Page 66 Abnormal stop condition table Preliminary error Another unit can be Error code Error type code operated in the group Discharge temperature fault 1202 1102 Condensation side water abnormal rise 1238 1138 Discharge SH fault 1276 1176 Suction gas SH fault 1289 1189 Low pressure fault...
  • Page 67 : Another module can be operated. : Operation impossible : Not abnormal stop *1: Case of the one pump system *2: "*" shows types of components. (0/1: COMP A, 2: COMP B)

  • Page 68: Calling For Service

    [3] Calling for Service If the problem cannot be solved by following the instructions provided in the table on the previous pages, please contact your dealer or servicer along with the types of information listed below. (1) Model name The model name is a string that starts with "ERCV" and is found on the lower part of the unit. (2) Serial number Example: 34W00001 (3) Error code...

  • Page 69: Operating The Unit

    7. Operating the Unit [1] Initial Operation 1. Make sure the Run/Stop switch that controls the unit on the local control panel is switched off. 2. Switch on the main power. 3. Leave the main power switched on for at least 12 hours before turning on the Run/Stop switch that controls the unit on the on-site control panel to warm up the compressor.
  • Page 70 [3] Using the Unit in Sub-freezing CAUTION In areas where temperature drops to freezing In areas where temperature can drop low enough during the periods of non-use, blow the water out to cause the water in the pipes to freeze, operate of the pipes or fill the pipes with anti-freeze the unit often enough to prevent the water from solution.

  • Page 71: Power On/Off

    [4] Using the Remote Controller (PAR-W31MAA) <1> Power ON/OFF Unit1 Press the [ON/OFF] button. During operation Next The ON/OFF lamp will light up in green, and the operation will start. Unit1 Pressing the [ON/OFF] button brings up a confirmation screen. When it appears, press the [F3] button.

  • Page 72: Using Weekly Timer

    <3> Using Weekly timer Function description Following settings can be used to change the operating schedule according to the day of the week. • Set the schedule for ON/OFF, operation mode and set temperature for each day of the week. Button operation Select "Weekly timer"...
  • Page 73 In the Operation setting screen, press the [F1] button to move the cursor to Unit1 "Schedule". Press the [F3] button to select "Yes". Power Save Schedule Anti-freeze Next <4> Using Period timer Function description Following settings can be made to change the specified period and daily operating schedule. •...
  • Page 74 The pattern setting screen will be displayed. Unit1 * Refer to the section on Weekly timer for details on using the pattern setting screen. Anti-Freeze Heating Weekly timer operation will be disabled in the following situations: • When Schedule is disabled When Schedule is disabled with the centralized controller or the connected unit, Schedule settings cannot be made with the remote controller.

  • Page 75: Using Power Save

    <5> Using power save Function description Power Save is a function that regulates the compressor rotation count either daily or according to a specified period and according to a preset time interval or regulated capacity. Use this function when you want to inhibit electric power use. A typical scenario where Power Save can be used to inhibit the power consumption for water heating would be periods of particularly heavy operating loads for air conditioning and other equipment, such as periods when large numbers of people check in at a hotel or similar accommodation facility.
  • Page 76 Press the [F1] to [F4] buttons to set the Power Save start time, end time and Unit1 control value. In the Operation setting screen, press the [F1] button to move the cursor to Unit1 Power Save. Press the [F3] button to select "Yes". Power Save Schedule Anti-freeze...

  • Page 77: Main Specifications

    8. Main Specifications [1] Model name A: Product sequence Voltage series Y: 3N ~ 380-400-415V Capacity Refrigerant type M: R32 Capacity control V: Inverter type C: 4 way valve less R: Water cooled type E: High efficiency type...

  • Page 78: Specifications

    Heat exchanger Evaporation side Stainless steel plate and copper brazing Condensation side Stainless steel plate and copper brazing Compressor Type Inverter scroll hermetic compressor Maker MITSUBISHI ELECTRIC CORPORATION Starting method Inverter Quantity Motor output 8.3 × 2 Lubricant MEL46EH Protection High pressure protection High pressure switch at 4.15MPa (601psi)
  • Page 79 *1 Under normal cooling conditions at evaporation side water inlet temp 12ºC (53.6ºF) outlet temp 7ºC (44.6ºF) condensation side water inlet temp 30ºC (86ºF) outlet temp 35ºC (95ºF). Pump input is not included in cooling capacity and power input. *2 Under normal cooling conditions at evaporation side water inlet temp 12ºC (53.6ºF) outlet temp 7ºC (44.6ºF) condensation side water inlet temp 30ºC (86ºF) outlet temp 35ºC (95ºF).
  • Page 80 SIDE OUTLET °C WATER TEMP. EVAPORATION SIDE INLET °C WATER TEMP. EER/COP and capacity according to EN14511 Contains fluorinated greenhouse gases. MANUFACTURER: MITSUBISHI ELECTRIC CORPORATION AIR-CONDITIONING & REFRIGERATION SYSTEMS WORKS 5-66, TEBIRA, 6-CHOME, WAKAYAMA CITY, JAPAN MADE IN JAPAN DWG.NO.KW79L684H01...

  • Page 81: Maintenance

    9. Maintenance [1] Operation status check Operate the unit for at least 30 minutes until the operation is stabilized before checking the operation status. <1> Voltage Ensure that the power-supply voltage is normal. • Ensure that the terminal voltage is within the range between -5% and +5% of the rated voltage at the rated frequency.
  • Page 82 <4> Water temperature Ensure that the inlet/outlet cold/hot water temperatures match the set temperatures. When a standard piping type is shared by two or more modules, make sure that the temperatures at the inlet/outlet of each module are approximately equal. Ensure that the water-flows are well-balanced.

  • Page 83: Long Period Of Non-Use

    [2] Long period of non-use <1> After the season or during summer When the units remain turned off for an extended period such as after the season or during summer, turn off the power switch. (Turn off the power switch on the circulation pump if it is connected to a separate circuit.) •...
  • Page 84 [3] Guidelines for Maintenance and Inspection of Major Parts of Water-cooled Heat Pumps The table below shows regular inspection items, schedule, and parts replacement criteria under normal use condition. The "Inspection schedule" column under the "Preventive maintenance" column indicates the regular inspection schedule, and the "Maintenance schedule" column indicates an estimation of the time when the parts need to be cleaned or adjusted or when old parts need to be replaced or repaired.
  • Page 85 Remark of semiotics : Inspection schedule : Cleaning or adjustment schedule of the parts based on the inspection result : Replacement or repair of the parts in case of error after inspection : Regular replacement (consumable parts) Preventive maintenance Inspection Maintenance Elapsed year* schedule...
  • Page 88 Please be sure to put the contact address/telephone number on this manual before handing it to the customer. HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Authorized representative in EU:MITSUBISHI ELECTRIC EUROPE B.V. HARMAN HOUSE, 1 GEORGE STREET, UXBRIDGE, MIDDLESEX UB8 1QQ, U.K. WT10407X01...

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