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Mitsubishi Electric EHSD-MED Service Manual
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Mitsubishi Electric EHSD-MED Service Manual

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HYDROBOX
SERVICE MANUAL
[Model Name]
EHSD-MED
EHSD-VM2D
EHSD-VM6D
EHSD-YM9D
EHSD-YM9ED
EHSD-TM9D
ERSD-MED
ERSD-VM2D
ERSD-VM6D
ERSD-YM9D
[Service Ref.]
Refer to page 2.
HYDROBOX
EHSC-MED
EHSC-VM2D
EHSC-VM6D
EHSC-YM9D
EHSC-YM9ED
EHSC-TM9D
ERSC-MED
ERSC-VM2D
ERSC-VM6D
ERSC-YM9D
EHSE-MED
EHSE-YM9ED
ERSE-MED
ERSE-YM9ED
EHPX-VM2D
EHPX-VM6D
EHPX-YM9D
EHPX-MED
EHPX-YM9ED
ERPX-MD
ERPX-VM2D
ERPX-VM6D
ERPX-YM9D
CONTENTS
1. REFERENCE MANUAL ................................... 3
2. SAFETY PRECAUTION ................................... 4
3. SPECIFICATIONS ............................................ 6
4. PART NAMES AND FUNCTIONS .................. 8
5. OUTLINES AND DIMENSIONS ....................... 9
6. WIRING DIAGRAM ......................................... 11
7. FIELD WIRING ............................................... 17
8. WATER SYSTEM DIAGRAM ......................... 19
9. CONTROLS ................................................... 22
10. TROUBLESHOOTING ................................... 43
11. DISASSEMBLY PROCEDURE ...................... 60
13. SERVICE AND MAINTENANCE ................... 81
PARTS CATALOG (OCB712)
October 2020
No. OCH712
REVISED EDITION-C
Revision:
• ERSD-VM6D, ERSD-
YM9D, ERSC-VM6D,
ERSC-YM9D and
ERPX series have been
added.
• Some descriptions
have been modified in
REVISED EDITION-C.
OCH712B is void.
Note:
• This manual describes
service data of
Hydrobox only.

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Summary of Contents for Mitsubishi Electric EHSD-MED

  • Page 1: Table Of Contents

    HYDROBOX October 2020 No. OCH712 REVISED EDITION-C SERVICE MANUAL [Model Name] EHSD-MED EHSC-MED EHSE-MED Revision: • ERSD-VM6D, ERSD- EHSD-VM2D EHSC-VM2D EHSE-YM9ED YM9D, ERSC-VM6D, ERSC-YM9D and EHSD-VM6D EHSC-VM6D ERSE-MED ERPX series have been added. EHSD-YM9D EHSC-YM9D ERSE-YM9ED • Some descriptions have been modified in...
  • Page 2 [Service Ref.] EHSD-MED.UK EHSD-VM2D.UK EHSD-VM6D.UK EHSD-YM9D.UK EHSD-YM9ED.UK EHSD-TM9D.UK ERSD-MED.UK ERSD-VM2D.UK ERSD-VM6D.UK ERSD-YM9D.UK EHSC-MED.UK EHSC-VM2D.UK EHSC-VM6D.UK EHSC-YM9D.UK EHSC-YM9ED.UK EHSC-TM9D.UK ERSC-MED.UK ERSC-VM2D.UK ERSC-VM6D.UK ERSC-YM9D.UK EHSE-MED.UK EHSE-YM9ED.UK ERSE-MED.UK ERSE-YM9ED.UK EHPX-VM2D.UK EHPX-VM6D.UK EHPX-YM9D.UK EHPX-MED.UK EHPX-YM9ED.UK ERPX-MD.UK ERPX-VM2D.UK ERPX-VM6D.UK ERPX-YM9D.UK OCH712C...

  • Page 3: Reference Manual

    REFERENCE MANUAL OUTDOOR UNIT'S SERVICE MANUAL Service Ref. Service Manual No. SUZ-SWM40VA.TH OCH718 SUZ-SWM60VA.TH OCB718 SUZ-SWM80VA.TH PUHZ-FRP71VHA2 OCH665 PUHZ-FRP71VHA2R1 OCB665 PUHZ-SW120VHAR5(-BS).UK OCH533 PUHZ-SW120YHAR5(-BS).UK OCB533 OCH526 PUHZ-SHW140YHAR5(-BS).UK OCB526 PUHZ-SW160YKAR1(-BS).UK OCH583 PUHZ-SW200YKAR1(-BS).UK OCB583 OCH594 PUHZ-SHW230YKA2R2 OCB594 PUHZ-SHW80VAA(-BS).UK PUHZ-SHW80YAA(-BS).UK PUHZ-SHW112VAA(-BS).UK PUHZ-SHW112YAA(-BS).UK PUHZ-SW75VAA(-BS).UK OCH651 PUHZ-SW75YAA(-BS).UK OCB651 PUHZ-SW75VAA-SC.UK...

  • Page 4: Safety Precaution

    Do not position furniture or electrical appliances below the outdoor unit or hydrobox. The discharge pipework from the emergency/safety devices of the hydrobox should be installed according to local law. Only use accessories and replacement parts authorised by Mitsubishi Electric ask a qualified technician to fit the parts. Electrical All electrical work should be performed by a qualified technician according to local regulations and the instructions given in this manual.
  • Page 5 CAUTION Use clean water that meets local quality standards on the primary circuit. The outdoor unit should be installed in an area with sufficient airflow according to the diagrams in the outdoor unit installation manual. The hydrobox should be located inside to minimise heat loss. Water pipe-runs on the primary circuit between outdoor and indoor unit should be kept to a minimum to reduce heat loss.

  • Page 6: Specifications

    SPECIFICATIONS OCH712C...
  • Page 7 OCH712C...

  • Page 8: Part Names And Functions

    PART NAMES AND FUNCTIONS <E*PX-*M**D> (Packaged model system) <Figure 4.1> <Figure 4.2> <E*S*-*M**D> (Split model system) <E*SE-*M*ED> (Split model system) <Figure 4.3> <Figure 4.4> Part name EHPX-*M*(E)D ERPX-MD ERPX-*M*D EHS*-MED EHS*-*M*D EHS*-YM9ED ERS*-*M*(E)D ERS*-MED Control and electrical box Note: Main remote controller For installation of all E***-*M*ED models, make sure to install Plate heat exchanger (Refrigerant - Water)

  • Page 9: Outlines And Dimensions

    OUTLINES AND DIMENSIONS 5-1. Technical Drawings <Unit: mm> HOOK AUTO AIR VENT FRONT PANEL EARTH LEAKAGE BREAKER BACK PANEL SUPPORT TERMINAL BED MAIN CONTROLLER MANOMETER PRESSURE RELIEF VALVE G1/2 (242) <Side> <Rear> <Front> <EHPX> (Packaged model system for heating) <ERPX> (Packaged model system for heating and cooling) E B A <View from below>...
  • Page 10 <Unit: mm> <EHS*> (Split model system for heating) <ERS*> (Split model system for heating and cooling) <View from below> <View from below> <E*SE> (Split model system for heating/ heating and cooling) HOOK AUTO AIR VENT FRONT PANEL EARTH LEAKAGE BREAKER TERMINAL BED BACK PANEL SUPPORT MAIN CONTROLLER...

  • Page 11: Wiring Diagram

    WIRING DIAGRAM 6-1. EHSD-MED.UK, ERSD-MED.UK, EHSC-MED.UK, ERSC-MED.UK, EHSE-MED.UK, ERSE-MED.UK, EHPX-MED.UK, ERPX-MD.UK CNPWM CN01 Indoor unit powered Indoor unit powered (WH) (BK) by independent source via outdoor unit <How to use TBO.1 to 4> Connect them using either way as shown below.
  • Page 12 6-2. EHSD-VM2D.UK, ERSD-VM2D.UK, EHSC-VM2D.UK, ERSC-VM2D.UK, EHPX-VM2D.UK, ERPX-VM2D.UK CNPWM CN01 Indoor unit powered Indoor unit powered (WH) (BK) Power supply by independent source via outdoor unit <How to use TBO.1 to 4> to Booster heater Connect them using either way as shown below. To outdoor Power supply To outdoor...
  • Page 13 6-3. EHSD-VM6D.UK, ERSD-VM6D.UK, EHSC-VM6D.UK, ERSC-VM6D.UK, EHPX-VM6D.UK, ERPX-VM6D.UK CNPWM CN01 Indoor unit powered Indoor unit powered (WH) (BK) by independent source via outdoor unit <How to use TBO.1 to 4> Power supply Connect them using either way as shown below. To outdoor To outdoor Power supply to Booster heater...
  • Page 14 6-4. EHSD-YM9D.UK, EHSD-YM9ED.UK, ERSD-YM9D.UK, EHSC-YM9D.UK, EHSC-YM9ED.UK, ERSC-YM9D.UK, EHSE-YM9ED.UK, ERSE-YM9ED.UK, EHPX-YM9D.UK, EHPX-YM9ED.UK, ERPX-YM9D.UK CNPWM CN01 Indoor unit powered Indoor unit powered (WH) (BK) Power supply by independent source via outdoor unit <How to use TBO.1 to 4> to Booster heater Connect them using either way as shown below. 3~ 400V 50Hz To outdoor To outdoor...
  • Page 15 6-5. EHSD-TM9D.UK, EHSC-TM9D.UK CNPWM CN01 Indoor unit powered Indoor unit powered (WH) (BK) Power supply by independent source via outdoor unit <How to use TBO.1 to 4> to Booster heater Connect them using either way as shown below. 3~ 230V 50Hz To outdoor Power supply To outdoor...
  • Page 16 6-6. DIP Switch Functions The DIP switch number is printed on the circuit board next to the relevant switch- es. The word ON is printed on the circuit board and on the DIP switch block itself. To move the switch you need to use a pin or the corner of a thin metal ruler or similar.

  • Page 17: Field Wiring

    FIELD WIRING Option1: Hydrobox powered via outdoor unit <1 phase> Affix label A that is included with the manuals near each wiring diagram for hydrobox and outdoor units. Hydrobox Outdoor unit To control Earth Wiring board leakage circuit Power supply circuit breaker or ~/N 230 V 50 Hz...
  • Page 18 Option2: Hydrobox powered by independent source <1 phase> Affix label B that is included with the manuals near each wiring diagram for hydrobox and outdoor units. Hydrobox Earth Wiring leakage circuit Power supply circuit breaker or ~/N 230 V 50 Hz breaker Isolating *1, *2...

  • Page 19: Water System Diagram

    WATER SYSTEM DIAGRAM Water flow <E*PX> (Packaged model system) Part name Cold Hydrobox 1 Control and electrical box water Note: 2 Main remote controller Do not attach an Plate heat exchanger additional pressure (Refrigerant - Water) relief valve to the 4 Water circulation pump 1 heating (cooling) 5 Pump valve...
  • Page 20 Local system 1-zone temperature control Zone1 Zone1 2-zone temperature control 1-zone temperature control with boiler Zone1 Zone1 Zone2 2-zone temperature control & Buffer tank control 1-zone temperature control (2-zone valve ON/OFF control) Zone1 Zone1 Zone2 Zone2 1. Zone1 heat emitters (e.g. radiator, fan coil unit) (local supply) 10.
  • Page 21 Filling the System (Primary Circuit) 1. Check and charge expansion vessel. 2. Check all connections including factory fitted ones are tight. 3. Insulate pipe work between hydrobox and outdoor unit. 4. Thoroughly clean and flush, system of all debris. (Refer to 4.2 in the installation manual.) 5.

  • Page 22: Controls

    The following is a guide to viewing the main settings. Should you require more Menu Access to system settings for initial set up and information please contact your installer or local Mitsubishi Electric dealer. modifications. Cooling mode is available for ERS series only. However, Cooling mode is not Back Return to previous menu.
  • Page 23 9-2. Setting the Main remote controller After the power has been connected to the outdoor and hydrobox (See "7. FIELD WIRING"), the initial system settings can be entered via the main remote controller. 1. Check all breakers and other safety devices are correctly installed and turn on power to the system. 2.
  • Page 24 <Main Controller Menu Tree> Unrestricted access Initial Installer only Shaded items relate Main screen * Short press for 1 Zone system. to DHW functions. These are only avail- Information able if the system in- Option cludes a DHW tank. Forced DHW ON ( )/OFF ON ( )/Prohibited ( )/Timer ( ) Long press...
  • Page 25 Unrestricted access <Continued from the previous page.> Installer only <Main Controller Menu Tree> Shaded items relate Initial to DHW functions. These are only avail- Main screen Main menu able if the system in- Manual operation cludes a DHW tank. Menu Function settings Service Thermistor adjustment...
  • Page 26 Unrestricted access <Continued from the previous page.> Installer only <Main Controller Menu Tree> Shaded items relate Initial to DHW functions. These are only avail- Main screen Main menu able if the system in- cludes a DHW tank. Menu Long press Booster heater 1 capacity Electric heater Booster heater 2 capacity...
  • Page 27 9-4. Service Menu The service menu provides functions for use by installer or service engineer. It is NOT intended the home owner alters settings within this menu. It is for this reason password protection is required to prevent unauthorised access to the service settings. The factory default password is "0000".
  • Page 28 <Thermistor adjustment> This function allows adjustments to be made to the thermistor readings from −10 to 10°C in 0.5°C intervals. THW1: Thermistor (Flow water temp.) THW2: Thermistor (Return water temp.) THW5B: Thermistor (DHW tank water temp.)(Option) THW6: Thermistor (Zone1 flow temp.)(Option) THW7: Thermistor (Zone1 return temp.)(Option) THW8: Thermistor (Zone2 flow temp.)(Option) THW9: Thermistor (Zone2 return temp.)(Option)
  • Page 29 Mixing valve control 1. From the Auxiliary settings menu, highlight Mixing valve control. 2. Press CONFIRM. 3. The Mixing valve control screen is displayed. 4. Use F1 and F2 buttons to set Running time between 10 to 240 seconds. The Running time equals to a period from full open of the valve (at a hot water mixing ratio of 100%) to full close (at a cold water mixing ratio of 100%).
  • Page 30 <Operation settings> Heating operation This function allows operational setting of flow temperature range from the Ecodan and also the time interval at which the FTC collects and processes data for the auto adaptation mode. Menu subtitle Function Range Unit Default Flow temp.
  • Page 31 Booster heater1 Booster heater2 Pump1 * 2 Pump2 Pump3 Default 2 kW 4 kW ***(factory fitted pump) 0 kW 0 kW EHSD-MED 0 kW 0 kW EHSD-VM2D 2 kW 0 kW EHSD-VM6D 2 kW 4 kW EHSD-YM9D 3 kW 6 kW...
  • Page 32 2. Settings using the main remote controller In this menu, all parameters required to record the consumed electrical energy and the delivered heat energy which is displayed on the main remote controller can be set. The parameters are an electric heater capacity, supply power of water pump and heat meter pulse.
  • Page 33 <Summary of settings> This function shows the current installer/user entered settings. Abbreviation Explanation Abbreviation Explanation HWtemp DHW max temperature Z2 mode Operation mode HWdrop DHW temperature drop - HER (Heating room temperature) HWtime DHW max operation time - HE (Heating flow temperature) NO HW DHW mode restriction - HCC (Heating compensation curve)
  • Page 34 Resetting the password If you forget the password you entered, or have to service a unit somebody else installed, you can reset the password to the factory default of 0000. 1. From the main settings menu, scroll down the functions until Service Menu is highlighted.
  • Page 35 <Table 9-4-1> Request code in running information Request Request content Range Unit code Error history 1 (latest) Displays error history. ("– –" is displays if no history is present.) Code Error history 2 (second to last) Displays error history. ("– –" is displays if no history is present.) —...
  • Page 36 Indoor unit switch setting display (Request code: 162 to 166) 0: OFF 1: ON 0: OFF 1: ON SW1, SW2, SW3, SW4, SW5 SW1, SW2, SW3, SW4, SW5 Display Display 00 00 00 40 00 01 00 41 00 02 00 42 00 03 00 43...
  • Page 37 Indoor unit switch setting display (Request code: 162 to 166) 0: OFF 1: ON 0: OFF 1: ON SW1, SW2, SW3, SW4, SW5 SW1, SW2, SW3, SW4, SW5 Display Display 00 80 00 C0 00 81 00 C1 00 82 00 C2 00 83 00 C3...
  • Page 38 Output signal display (Request code: 175/553) Please refer to Table 2 on relevant wiring diagram whilst using the following. 0: OFF 1: ON 0: OFF 1: ON Display Display xx 40 xx 00 xx 01 xx 41 xx 02 xx 42 xx 43 xx 03 xx 04...
  • Page 39 Output signal display (Request code: 175/553) Please refer to Table 2 on relevant wiring diagram whilst using the following. 0: OFF 1: ON 0: OFF 1: ON Display Display xx C0 xx 80 xx C1 xx 81 xx C2 xx 82 xx C3 xx 83 xx C4...
  • Page 40 Display Output signal display (Request code: 175/553) 40 xx Please refer to Table 2 on relevant wiring diagram whilst using the following. 41 xx 42 xx 0: OFF 1: ON 43 xx Display 44 xx 45 xx 00 xx 46 xx 01 xx 47 xx 02 xx...
  • Page 41 Input signal display (Request code: 176/554) Please refer to Table 1 on relevant wiring diagram whilst using the following. 0: OFF (open) 1: ON (short) 0: OFF (open) 1: ON (short) Display Display 00 00 00 40 00 01 00 41 00 02 00 42 00 03...
  • Page 42 Indoor unit only operation Indoor unit only operation In indoor unit only operation, operation without connecting outdoor unit is possible. Indoor unit During Indoor unit only operation, the main control has control functions. Necessary Heat pump Not necessary <Heater> Main remote controller Necessary Heating for DHW and space heating is provided by the heater.

  • Page 43: Troubleshooting

    TROUBLESHOOTING 10-1. Troubleshooting <Summary of self diagnosis based on check codes and Service Procedures> Present and past check codes are logged, and they can be displayed on the main remote controller or control board of the outdoor unit. Please refer to the table below and subsequent explanations to diagnose and remedy typical problems that may occur in the field. Unit Condition Check code Action...
  • Page 44 10-4. Self diagnosis and action Check if DIP SW is set correctly. (Refer to "6-6. DIP switch functions".) Check code Title and display conditions Possible Cause Diagnosis and action Circulation water temperature overheat Insufficient system head Refer to table in "10-6. Checking Compo- protection nent Parts' Function"...
  • Page 45 Check code Title and display conditions Possible Cause Diagnosis and action P1/P2/L5/LD Indoor unit temperature thermistor failure Connector/terminal wire has become Visually check the terminals and connec- Note: The thermistors subject to failure can be detached or loose wiring. tions and reattaches appropriate. checked in “Request code: 567”...
  • Page 46 Check code Title and display conditions Possible Cause Diagnosis and action Heating operation error THW1 has become detached from its Visually inspect location and reattach as Note: “3” is displayed in “Request code: 567” in holder. necessary. “Running information”. Booster heater fault Electrically test to determine fault.
  • Page 47 Check code Title and display conditions Possible Cause Diagnosis and action Low primary circuit (Zone2 side) flow rate Insufficient system head If more head required either add a pump of the same size or replace existing pump. detected by flow switch Note: “3”...
  • Page 48 Check code Title and display conditions Possible Cause Diagnosis and action Anti-freeze protection of plate heat exchanger <Cooling> <Cooling> Reduced water flow 1., 2. Check water piping. The check code displayed when Ref. liquid temp. • Clogged filter (TH2) stays at −5ºC or lower for 10 seconds after •...
  • Page 49 Check code Title and display conditions Possible Cause Diagnosis and action Indoor/outdoor communication failure Fault with FTC transmission/receiving 1. to 3. (Transmission error) circuit board Turn the power to the indoor unit OFF and Check code E7 is displayed if signal "1" is then ON.
  • Page 50 10-5. Troubleshooting by inferior phenomena Fault symptom Possible cause Explanation - Solution Main remote controller There is no power supply to main remote Check LED2 on FTC. (See "6. WIRING DIAGRAM".) display is blank. controller. (i) When LED2 is lit. Check for damage or contact failure of the main remote controller wiring.
  • Page 51 Contact your Mitsubishi Electric dealer. Immersion heater cut-out tripped. Check immersion heater thermostat and press reset button, located on im- mersion heater boss, if safe. If the heater has been operated with no water inside it may have failed, so please replace it with a new one.
  • Page 52 Contact your Mitsubishi Electric dealer. Immersion heater cut-out has been triggered. Check immersion heater thermostat and press reset button if safe. If the heater kept running with no water inside, this may have resulted in failure, so replace it with a new one.
  • Page 53 Fault symptom Possible cause Explanation - Solution In 2-zone tempera- When Zone1 and Zone2 are both in heating Normal operation, no action necessary. ture control, only mode, the hot water temperature in Zone2 Zone2 does not does not exceed that in Zone1. reach the set tem- Faulty wiring of motorized mixing valve Refer to "5.3 Wiring for 2-zone temperature control"...
  • Page 54 ON and OFF. Annual Maintenance It is essential that the hydrobox is serviced at least once a year by a qualified individual any spare parts required MUST be purchased from Mitsubishi Electric (safety matter). NEVER bypass safety devices or operate the unit without them being fully operational.
  • Page 55 10-6. Checking Component Parts' Function Part Name Checkpoints <Water Circulation Pump Characteristics> ERSC series 80.0 Speed 5 (Default setting) BROWN 70.0 PWM input signal Speed 4 Signal cable BLUE 60.0 Speed 3 Signal ref. BLACK 50.0 Speed 2 Feedback signal Speed 1 40.0 BROWN...
  • Page 56 Part Name Checkpoints Earth leakage circuit breaker for heater If a short circuit occurs on the booster heater, immersion heater, or each power line, a short-circuit breaker will trip and power source will be blocked. Eliminate the causes of short circuit and then turn on the breaker again. Relay for heater When the applied voltage is not 230 VAC across the terminals A1-A2, check the terminals A1 A2...
  • Page 57 Part Name Checkpoints Thermistors Disconnect the connector then measure the resistance with a multimeter. (At ambient temperatures of 10 to 30°C.) Thermistor Normal Abnormal THW1 THW2 THW5A 4.3 to 9.5 kΩ Open or short THW5B THW6 THW7 THW8 THW9 THW10 40 to 100 kΩ...
  • Page 58 <Thermistors Characteristics Charts> • Room temperature thermistor (TH1) • Refrigerant liquid temperature thermistor (TH2) • Flow water temperature thermistor (THW1) • Return water temperature thermistor (THW2) • DHW tank water temperature thermistor (THW5A/5B) • Zone1 flow temperature thermistor (THW6) • Zone1 return temperature thermistor (THW7) •...
  • Page 59 10-7. Test point diagram FTC (Controller board) CNP1/OUT1 (TBO.1 1-2) Water circulation pump1 (230 VAC) OUT2 (TBO.1 3-4) Water circulation pump2 (Local supply) (230 VAC) CN01 OUT3 (TBO.1 5-6) Power supply Water circulation pump3 (3-5: 230 VAC) (Local supply) (230 VAC) CNP4/OUT14 Water circulation pump4 (230 VAC)

  • Page 60: Disassembly Procedure

    DISASSEMBLY PROCEDURE <Preparation for the repair service> ● Prepare the proper tools. ● Prepare the proper protectors. ● Provide adequate ventilation. ● After stopping the operation of the hydrobox and outdoor unit, turn off all the power-supply breaker. ● Discharge the condenser before the work involving the electric parts. ●...
  • Page 61 Note: To avoid dropping of the contactors, hold the contac- tors by hand when removing the last screws. Note: The photo shown is of the EHSD-MED.UK model. To prevent an electrical shock, wait until all the LED lamps on the FTC control board are turned off.
  • Page 62 (Photo 4-3) Screws Screws Note: Disconnect the field wiring as necessary. Bracket Cable strap Note: The photo shown is of the EHSD-MED.UK model. Photo 4-2 Photo 4-3 Earth cable Side panel Control box Screws...
  • Page 63 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 5. How to remove water pump/ pump valve Photo 5-1 <Water pump> Water pump CNPWM Close the pump valve (OFF) before removing the water pump, connector (CNP1) Earth cable connector and open the valves (ON) after reinstalling the water pump. (1) Remove the front panel.
  • Page 64 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 5. How to remove water pump/ pump valve Photo 5-5 (E*SE series) (5) <E*SE series> Gasket (G1-1/2") Close (OFF) the pump valve and remove the G1-1/2" nuts using 2 spanners: one to hold the G1-1/2" nut and Nut (G1-1/2") the other to turn the other side of G1-1/2"...
  • Page 65 Flow direction O-rings O-ring Same diameter quick connection Note: The photo shown is of the EHSD-MED.UK model. Photo 7-1 7. How to remove the booster heater 　(Steps (1) through (4) are applied to all the following units.) Control box Booster heater (1) Remove the front panel.
  • Page 66 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 7. How to remove the booster heater Photo 7-2 E*S* series) Back panel Quick connection Flare nut Model Lead wire No. Contactor EHSC-VM2D ERSC-VM2D No.1 BHC1-U EHSD-VM2D ERSD-VM2D No.2 BHC1-V Booster O-ring EHPX-VM2D ERPX-VM2D heater EHSC-VM6D EHSD-VM6D No.1 BHC1-U...
  • Page 67 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 8. How to remove the plate heat exchanger 　(Steps (1) through (9) are applied to the following E*SC/D series.) (1) Pump down the refrigerant circuit and close the stop valve on the outdoor unit. (Refer to "12. Supplementary information".) (2) Remove the front panel.
  • Page 68 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES Photo 8-2 (EHSC series) 8. How to remove the plate heat exchanger (continued) <E*SC series> (11) Remove the G1" nut on the water outlet side of the strainer valve using 2 spanners: one to hold the strainer valve and the other to turn the G1"...
  • Page 69 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 8. How to remove the plate heat exchanger (continued) Photo 8-6 (E*SD series) <E*SD series> (11) <Only ERSD series> Remove the saddle band (upper the strainer) and the rubber tube by removing the 2 screws on the saddle band. (12) Detach the quick connection for the L joint (Lower), the plate heat exchanger, and rotate forward the pipe (STR- Plate heat...
  • Page 70 PHOTOS/ FIGURES DISASSEMBLY PROCEDURE 8. How to remove the plate heat exchanger (continued) <E*SE series> (1) Pump down the refrigerant circuit and close the stop valve on the outdoor unit. (Refer to "12. Supplementary information".) (2) Remove the front panel. (Refer to Procedure 1.) (3) Swing the control box to the front.
  • Page 71 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 8. How to remove the plate heat exchanger (continued) Photo 8-8 Different diameter (8) Remove the strainer valve by removing the 2 screws, and quick connection detaching the same diameter quick connection. (Photo 8-8) • When reinstalling the same diameter quick connection, use a new O-ring.
  • Page 72 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES Photo 10-1 (ERS* series) 10. How to remove the strainer (1) Remove the front panel. (Refer to Procedure 1.) Strainer Quick Strainer (2) Swing the control box to the front. (Refer to Procedure 4.) O-ring valve stay connection valve Screws...
  • Page 73 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 11. How to remove the manometer/ pressure relief valve/ air Photo 11-1 vent (automatic) Claw Screw (1) Remove the front panel. (Refer to Procedure 1.) (2) Swing the control box to the front. (Refer to Procedure 4.) <Manometer>...
  • Page 74 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 11. How to remove the manometer/ pressure relief valve/ air Photo 11-6 vent (automatic) (Continued) Expansion vessel Pressure relief valve (5 bar) <Pressure relief valve (5 bar)> (3) Remove the right side panel. (4) Remove the band at the base of the pressure relief valve (5 bar).
  • Page 75 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 13. How to remove the drain cock/ the air vent (manual) (pri- Photo 13 (E*S* series) mary circuit). (1) Remove the front panel. (Refer to Procedure 1.) (2) Swing the control box to the front. (Refer to Procedure 4.) (3) Remove the drain cock.
  • Page 76 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES Photo 15-1 15. How to remove the drain pan <ER** series> Claw Screw (1) Remove the front panel. (Refer to Procedure 1.) (2) Disconnect all the field piping. (3) Remove the screw on the manometer cover, then hold the sides of the manometer cover, disengage the 2 claws, Manometer and remove the manometer with cover.
  • Page 77 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 15. How to remove the drain pan <ER** series> (7) Remove the 3 screws each on the side panel (L, R). Then remove the 2 screws on the base assy. (Photo 15-7) (8) Remove the 5 screws on the base assy. (Photo 15-8) (9) Remove the drain pan from the base assy.
  • Page 78 PHOTOS/ FIGURES DISASSEMBLY PROCEDURE Photo 16-1 16. How to detach and attach the quick joint Refer to the following steps when detaching and attaching the quick connection. (1) Remove the clip. (Photos 16-1 and 16-2) (2) Separate the connected parts to remove the O-ring. (Photo 16-3) •...
  • Page 79 Notes on replacing the parts Replacement of the parts listed below requires the following procedure. After the parts are removed, eliminate loctite on threads by applying loctite remover, apply new loctite, and then install and tight- en the parts to the specified tightening torques below. For details about recommended loctite and loctite remover, refer to Table 11-1, and for details about the replacement parts and their tightening torques, refer to Table 11-2.

  • Page 80: Main Remote Controller

    SUPPLEMENTARY INFORMATION 12-1. Refrigerant collecting (pumpdown) for split model systems only Refer to “Refrigerant collection” in the outdoor unit installation manual or service manual. 12-2. Back-up operation of boiler Heating operation is backed up by boiler. For more details, refer to the installation manual of PAC-TH012HT(L)-E. <Installation &...

  • Page 81: Service And Maintenance

    13-1. Annual Maintenance It is essential that the hydrobox is serviced at least once a year by a qualified individual. Any required parts MUST be purchased from Mitsubishi Electric (safety matter). NEVER bypass safety devices or operate the unit without them being fully operational.
  • Page 82 Engineers Forms Commissioning/Field settings record sheet (continued from the previous page) Field Parameters Main remote controller screen Default setting Notes setting Setting Initial settings Language EN/FR/DE/SV/ES/IT/DA/NL/FI/NO/PT/BG/PL/CZ/RU/ TR/SL °C/°F °C/°F °C Summer time On/Off Temp. display Room/DHW tank/Room&DHW tank /Off Time display hh:mm/hh:mm AM/AM hh:mm hh:mm Room sensor settings for Zone1...
  • Page 83 Engineers Forms Commissioning/Field settings record sheet (continued from the previous page) Default Field Main remote controller screen Parameters Notes setting setting Service menu Operation Smart grid ready On/Off settings Target temp(+1 +20°C) / -- (Non active) Heating On/Off Target temp. Switch-on recommendation (20 60°C) 50°C Switch-on command (20...
  • Page 84 13-3. Annual Maintenance Log Book Contractor name Engineer name Site name Site number Hydrobox maintenance record sheet Warranty number Model number Serial number Mechanical Frequency Notes Isolate and drain hydrobox, remove mesh from internal strainer clean and replace. Open the pressure relief valve, check for unrestricted discharge to the tundish and that the valve reseats correctly.
  • Page 85 OCH712C...
  • Page 86 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued: Oct. 2020 No. OCH712 REVISED EDITION-C Issued: Apr. 2020 No. OCH712 REVISED EDITION-B Issued: Feb. 2020 No. OCH712 REVISED EDITION-A Published: Oct. 2019 No. OCH712 Specifications are subject to change without notice.

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