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Mitsubishi Electric EHPT17X-VM2E Service Manual

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CYLINDER UNIT
SERVICE MANUAL
[Model Name]
EHPT17X-VM2E
ERST20D-VM6E
EHPT17X-VM6E
ERST20D-YM9E
EHPT17X-YM9E
ERST30D-VM2EE
EHPT20X-MEHEW
ERST30D-VM6EE
EHPT20X-TM9E
ERST30D-YM9EE
EHPT20X-YM9E
ERST20C-VM2E
EHPT30X-YM9EE
ERST30C-VM2EE
EHST17D-VM2E
ERST20F-VM2E
EHST17D-YM9E
ERST20F-VM6E
EHST20D-VM2E
ERST20F-YM9E
EHST20D-VM6E
ERST20F-TM9E
EHST20D-YM9E
ERST30F-VM2EE
EHST20D-TM9E
ERST30F-VM6EE
EHST30D-MEE
ERST30F-YM9EE
EHST30D-VM6EE
ERST30F-TM9EE
EHST30D-YM9EE
EHST30D-TM9EE
ERPT17X-VM2E
ERPT20X-VM2E
ERPT20X-VM6E
ERPT20X-YM9E
ERPT30X-VM2EE
ERPT30X-VM6EE
ERPT30X-YM9EE
ERST17D-VM2E
ERST17D-VM6E
ERST17D-VM2BE
ERST17D-VM6BE
ERST17D-YM9BE
ERST20D-VM2E
CYLINDER UNIT
[Service Ref.]
EHPT17X-VM2E.UK
EHPT17X-VM6E.UK
EHPT17X-YM9E.UK
EHPT20X-MEHEW.UK
EHPT20X-TM9E.UK
EHPT20X-YM9E.UK
EHPT30X-YM9EE.UK
EHST17D-VM2E.UK
EHST17D-YM9E.UK
EHST20D-VM2E.UK
EHST20D-VM6E.UK
EHST20D-YM9E.UK
EHST20D-TM9E.UK
EHST30D-MEE.UK
EHST30D-VM6EE.UK
EHST30D-YM9EE.UK
EHST30D-TM9EE.UK
ERPT17X-VM2E.UK
ERPT20X-VM2E.UK
ERPT20X-VM6E.UK
ERPT20X-YM9E.UK
ERPT30X-VM2EE.UK
ERPT30X-VM6EE.UK
ERPT30X-YM9EE.UK
ERST17D-VM2E.UK
ERST17D-VM6E.UK
ERST17D-VM2BE.UK
ERST17D-VM6BE.UK
ERST17D-YM9BE.UK
ERST20D-VM2E.UK
MAIN REMOTE
CONTROLLER
ERST20D-VM6E.UK
ERST20D-YM9E.UK
ERST30D-VM2EE.UK
ERST30D-VM6EE.UK
ERST30D-YM9EE.UK
ERST20C-VM2E.UK
ERST30C-VM2EE.UK
ERST20F-VM2E.UK
ERST20F-VM6E.UK
ERST20F-YM9E.UK
ERST20F-TM9E.UK
ERST30F-VM2EE.UK
ERST30F-VM6EE.UK
ERST30F-YM9EE.UK
ERST30F-TM9EE.UK
CONTENTS
1. REFERENCE MANUAL ···························· 2
2. SAFETY PRECAUTION ··························· 3
3. SPECIFICATIONS ···································· 5
4. PART NAMES AND FUNCTIONS ·········· 10
5. OUTLINES AND DIMENSIONS ·············· 13
6. WIRING DIAGRAM ································· 15
7. FIELD WIRING ········································ 26
8. WATER SYSTEM DIAGRAM ·················· 30
9. CONTROLS ············································ 35
10. TROUBLESHOOTING ···························· 58
11. DISASSEMBLY PROCEDURE ··············· 77
13. SERVICE AND MAINTENANCE ·········· 101
PARTS CATALOG (OCB814)
August 2023
No. OCH814
REVISED EDITION-A
Note:
This manual describes
service data of cylinder
unit only.
Revision:
• Added model names
and service ref. in
REVISED EDITION-A.
OCH814 is void.

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Summary of Contents for Mitsubishi Electric EHPT17X-VM2E

  • Page 1: Table Of Contents

    August 2023 CYLINDER UNIT No. OCH814 SERVICE MANUAL REVISED EDITION-A [Service Ref.] [Model Name] Note: EHPT17X-VM2E EHPT17X-VM2E.UK ERST20D-VM6E ERST20D-VM6E.UK This manual describes EHPT17X-VM6E EHPT17X-VM6E.UK ERST20D-YM9E ERST20D-YM9E.UK service data of cylinder EHPT17X-YM9E EHPT17X-YM9E.UK unit only. ERST30D-VM2EE ERST30D-VM2EE.UK EHPT20X-MEHEW EHPT20X-MEHEW.UK ERST30D-VM6EE ERST30D-VM6EE.UK EHPT20X-TM9E EHPT20X-TM9E.UK...

  • Page 2: Reference Manual

    REFERENCE MANUAL OUTDOOR UNIT'S SERVICE MANUAL Service Ref. Service Manual No. PUZ-WZ50VAA(-BS).UK OCH816 PUZ-WZ60VAA(-BS).UK OCB816 PUZ-WZ80VAA(-BS).UK PUZ-WM50VHA(-BS).UK PUZ-WM60VAA(-BS).UK PUZ-WM85VAA(-BS).UK OCH727 Packaged model PUZ-WM85YAA(-BS).UK OCB727 PUZ-WM112VAA(-BS).UK PUZ-WM112YAA(-BS).UK PUZ-HWM140VHA(-BS) OCH748 PUZ-HWM140YHA(-BS) OCB748 PUMY-P112VKM6 PUMY-P125VKM6 PUMY-P140VKM6 OCH790 PUMY-P112YKM5 OCB790 PUMY-P125YKM5 PUMY-P140YKM5 SUZ-SWM30VA.TH SUZ-SHWM30VAH.TH SUZ-SWM40VA2.TH SUZ-SWM40VA2-SC.TH SUZ-SHWM40VAH.TH...

  • Page 3: Safety Precaution

    Do not position furniture or electrical appliances below or above the outdoor unit or cylinder unit. The discharge pipework from the emergency devices of the cylinder unit 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 4 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 cylinder unit 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 5: Specifications

    SPECIFICATIONS OCH814A...
  • Page 6 OCH814A...
  • Page 7 OCH814A...
  • Page 8 OCH814A...
  • Page 9 OCH814A...

  • Page 10: Part Names And Functions

    PART NAMES AND FUNCTIONS <E**T***-*M**E> (Split model system) (Split model 2-zone system) (Packaged model system) Note: For installation of all E**T***-*M*EE* models, make sure to install a suitably sized primary-side expansion vessel. (See figure 8.1 - 8.4 and 10.6.1 for further guidance) <Figure 4.1>...
  • Page 11 EHST17/20D- EHST30D- EHST30D- ERST17/20D- ERST30D- ERST20F- ERST30F- ERST17D- Part name *M*E *M*EE *M*E *M*EE *M*E *M*EE *M*BE A DHW outlet pipe B Cold water inlet pipe C Water pipe (Space heating/cooling return connection) D Water pipe (Space heating/cooling flow connection) E Water pipe (Flow from heat pump connection) —...
  • Page 12 ERST20C- ERST30C- EHPT17/20X- EHPT30X- ERPT17/20X- ERPT30X- EHPT20X- Part name *M*E *M*EE *M*E *M*EE *M*E *M*EE MEHEW DHW outlet pipe Cold water inlet pipe Water pipe (Space heating/cooling return connection) Water pipe (Space heating/cooling flow connection) Water pipe (Flow from heat pump connection) —...

  • Page 13: Outlines And Dimensions

    OUTLINES AND DIMENSIONS 5-1. Technical Drawings <E**T***-*M**E> <Unit: mm> 67.8 (Packaged model system) DHW OUTLET (G3/4) <EHPT20X-MEHEW> <E*PT30X-*M*EE> RETURN TO HEAT PUMP COLD WATER INLET (G3/4) CONNECTION (28mm pipe) DHW tank SPACE HEATING FLOW CONNECTION (G1) 170L 200L 300L capacity 442.3 SPACE HEATING RETURN CONNECTION (G1) 515.7...
  • Page 14 (Split model 2-zone system) <Unit: mm> REFRIGERANT GAS PIPE CONNECTION 67.9 (12.7mm (1/2F)) DHW OUTLET (G3/4) REFRIGERANT LIQUID PIPE CONNECTION COLD WATER INLET (G3/4) (6.35mm (1/4F)) FLOW WITH HEAT PUMP 334.9 RETURN TO HEAT PUMP CONNECTION (ZONE 1) CONNECTION (ZONE 1) 414.9 (G1) (G1)

  • Page 15: Wiring Diagram

    WIRING DIAGRAM 6-1. E**T***-VM2(E)E OCH814A...
  • Page 16 6-2. E**T***-VM6(E)E OCH814A...
  • Page 17 6-3. E**T***-YM9(E)E OCH814A...
  • Page 18 6-4. EH*T***-TM9(E)E OCH814A...
  • Page 19 6-5. EHPT20X-MEHEW OCH814A...
  • Page 20 6-6. E**T***-M(E)E OCH814A...
  • Page 21 6-7. ERST17D-VM2BE OCH814A...
  • Page 22 6-8. ERST17D-VM6BE OCH814A...
  • Page 23 6-9. ERST17D-YM9BE OCH814A...
  • Page 24 6-10. DIP Switch Functions The DIP switch number is printed on the circuit board next to the relevant switches. 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 25 Default settings: DIP switch Function Indoor unit model SW6 SW6-1 — — — SW6-2 — — — OFF: Except E*ST**D-*M**E SW6-3 Pressure sensor Inactive Active ON: E*ST**D/F-*M**E SW6-4 Analog output signal (0-10 V) Inactive Active SW6-5 — — — SW6-6 —...

  • Page 26: Field Wiring

    FIELD WIRING 7-1. Electrical Connection All electrical work should be carried out by a suitably qualified technician. Failure to comply with this could lead to electrocution, fire, and death. It will also invalidate product warranty. All wiring should be according to national wiring regulations. The cylinder unit can be powered in two ways.
  • Page 27 <3 phase> Affix label A that is included with the manuals near each wiring diagram for cylinder unit and outdoor units. Cylinder unit Outdoor unit To control board Wiring Earth circuit leakage Power supply breaker circuit 3N~ 400 V 50 Hz breaker Isolating *1, *2...
  • Page 28 Option 2: Cylinder unit powered by independent source If the cylinder unit and outdoor unit have separate power supplies, the following requirements MUST be carried out: Initial settings (Power supplied by CN01 outdoor unit) • Change the interconnected wiring in the control and electrical box of the cylinder unit (see Figure 7.3).
  • Page 29 <3 phase> Affix label B that is included with the manuals near each wiring diagram for indoor unit and outdoor units. Cylinder unit Wiring Earth circuit leakage breaker circuit Power supply breaker Isolating *1, *2 switch ~/N 230 V 50 Hz Outdoor unit Wiring Earth...

  • Page 30: Water System Diagram

    WATER SYSTEM DIAGRAM <E*PT17X-*M*E> (Packaged model system) *a. Refer to the following section [Local system]. *b. If the outdoor unit is higher than the indoor unit, or if there is a location where air gets Water flow trapped in the upper part of the water pipe, Cold water consider adding this part.
  • Page 31 <E*PT20X-*M**E> (Packaged model system) Go to the Mitsubishi Electric website to check the water circuit of other units and the component Cold water parts of each unit. *a Refer to the following section "Local system". *b If the outdoor unit is higher than the indoor...
  • Page 32 Cold water Drain Drain Local system Go to the Mitsubishi Electric website to check the water circuit of other units and the component parts of each unit. *a Refer to the following section "Local system". *b If the outdoor unit is higher than the indoor...
  • Page 33 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 34 Filling the System (Primary Circuit) 1. Check and charge expansion vessel. 2. Check all connections including factory fitted ones are tight. 3. Insulate pipework between cylinder unit and outdoor unit. 4. Thoroughly clean and flush all debris from the system. (see "11.

  • Page 35: Controls

    To change the settings of your heating/cooling system, please use the main remote controller located on the wall or the front panel of the cylinder unit or hydrobox. The following is a guide to viewing the main settings. Should you require more information, please contact your installer or local Mitsubishi Electric dealer. Some functions are not available depending on the system configuration.
  • Page 36 Quick start When the main remote controller is switched on for the first time, the screen automatically goes to the [Language], [Date/Time], [System configuration], and quick start setting screen in order. On the quick start setting screen, the following items can be set. Note: [Electric booster heater use] This setting restricts the booster heater capacity.
  • Page 37 <Main Controller Menu Tree> When the system is started up for the first time, the quick start [Home screen] setting screen appears. The items with an asterisk (*) cannot be edited when the lock [Heating menu is on. (The icon changes to when the lock menu is on.) /Cooling] [Zone 1] Target temperature ( + / - )
  • Page 38 Continued from the previous page. When the system is started up for the first time, the quick start <Main Controller Menu Tree> setting screen appears. The items with an asterisk (*) cannot be edited when the lock [Home screen] menu is on. (The icon changes to when the lock menu is on.) [Menu] [Service]*...
  • Page 39 Continued from the previous page. When the system is started up for the first time, the quick start setting screen appears. <Main Controller Menu Tree> The items with an asterisk (*) cannot be edited when the lock menu is on. (The icon changes to when the lock menu is on.) •...
  • Page 40 Menu subtitle Function Range Unit Default value DHW target temp. Desired temperature of stored hot water 40 - 70*1 °C [Max. temp. drop] Difference in temperature between the DHW maximum temperature and the temperature at which DHW 5 - 40*2 °C mode restarts [Max.
  • Page 41 Menu subtitle Description [Zone sensor selection] When 2-zone temperature control is active and wireless remote controllers are available, select [Zone sensor selection] in [Room sen- sors] from [Setting], and then select zone No. (Zone 1/Zone 2) to assign each remote controller. [Zone 1 programme] From [Zone 1 programme] or [Zone 2 programme], select a wireless remote controller to be used for monitoring the room temperature [Zone 2 programme]...
  • Page 42 9-4. Service Menu The service menu provides functions to be used by installer or service engineer. It is NOT intended for the home owner to alter 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 43 <Thermistor adjustment> This function allows adjustments to be made to the thermistor readings from −10 Back to 10°C in 0.5°C intervals. Thermistor adjustment THW1: Thermistor (Flow water temp.) THW2: Thermistor (Return water temp.) THW5: Thermistor (DHW tank water temp.) 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 44 Mixing valve control 1/2 1. From the Auxiliary settings menu, select Mixing valve control 1/2. 2. Touch the confirm icon Back 3. The Mixing valve control screen is displayed. Mixing valve control 4. Use the +/- icon 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 45 <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 46 0 kW 0 kW 0 kW ERST30C-VM2EE 2 kW 0 kW 0 kW EHST30D-VM6EE 2 kW 4 kW 0 kW EHPT17X-VM2E 2 kW 0 kW 0 kW EHST30D-YM9EE 3 kW 6 kW 0 kW EHPT17X-VM6E 2 kW 4 kW 0 kW...
  • Page 47 2. Settings using the main remote controller Back In this menu, all parameters required to record the consumed electrical energy and the delivered heat Energy monitor settings 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 48 <Summary of settings> This function shows the current installer/user entered settings. Abbreviation Explanation Abbreviation Explanation Back HWtemp DHW max. temperature Z2 mode Operation mode Summary of settings HWdrop DHW temperature drop - HER (Heating room temperature) HWmax °C °C Ltemp HWtime DHW max.
  • Page 49 Password protection Back Next Password reset If you forget the password you entered, or have to service a unit somebody else installed, you can reset and change the password. 1. From [Service] in [Menu], access the [Password protection] screen. 2. Press and hold the title section for 3 seconds to access the [Password reset] screen.
  • Page 50 <Table 9.4.1> 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 51 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 52 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 53 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 54 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 55 0: OFF 1: ON Output signal display (Request code: 175/553) Display Please refer to Table 2 on relevant wiring diagram whilst using the following. 40 xx 41 xx 0: OFF 1: ON 42 xx 43 xx Display 44 xx 00 xx 45 xx 01 xx 46 xx...
  • Page 56 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 57 Indoor unit only operation Indoor unit only operation In indoor unit only operation, an operation without connecting outdoor unit is possible. Indoor unit When in Indoor unit only operation, the main control has control functions. Necessary Heat pump Not necessary <Heater>...

  • Page 58: 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 59 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 1. Insufficient system head 1 Refer to table in "10-6. Checking Compo- protection nent Parts' Function"...
  • Page 60 Check code Title and display conditions Possible Cause Diagnosis and action P1/P2/L5/LD Indoor unit temperature thermistor failure 1. Connector/terminal wire has become 1. Visually check the terminals and connec- Note: The thermistors subject to failure can be detached or loose wiring. tions and reattaches appropriate.
  • Page 61 Check code Title and display conditions Possible Cause Diagnosis and action Heating operation error 1. THW1 has become detached from its 1. Visually inspect location and reattach as Note: “3” is displayed in “Request code: 567” in holder. necessary. “Running information”. 2.
  • Page 62 Check code Title and display conditions Possible Cause Diagnosis and action Low primary circuit (Zone2 side) flow rate 1. Insufficient system head 1. If more head required either add a pump of the same size or replace existing pump. detected by flow switch Note: “3”...
  • Page 63 Check code Title and display conditions Possible Cause Diagnosis and action Anti-freeze protection of plate heat exchanger 1. Reduced water flow 1., 2. Check water piping. • Clogged filter The error of P6 is detected when refrigerant • Leakage of water temperature drops rapidly during cooling or defrost- 2.
  • Page 64 Check code Title and display conditions Possible Cause Diagnosis and action Indoor/outdoor communication failure 1. 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 despite the FTC 2.
  • Page 65 10-5. Troubleshooting by inferior phenomena Fault symptom Possible cause Explanation - Solution Main remote controller 1. There is no power supply to main remote 1. 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 66 Contact your Mitsubishi Electric dealer. 7. Immersion heater cut-out tripped. 7. Check immersion heater thermostat and press reset button, located on im- mersion heater boss, if safe.
  • Page 67 Contact your Mitsubishi Electric dealer. 5. Immersion heater cut-out has been triggered. 5. Check immersion heater thermostat and press reset button located on immer- sion heater boss, if safe.
  • Page 68 Fault symptom Possible cause Explanation - Solution Heating system does Heating system operates depending on the heating Normal operation, no action necessary. not reach the set load to prevent low-load heating system from the lower temperature. frequent switching (ON/OFF) of the compressor. In 2-zone tempera- 1.
  • Page 69 Fault symptom Possible cause Explanation - Solution Water discharges from 1. If continual – field supplied pressure reducing 1. Check function of pressure reducing valve and replace if necessary. expansion relief valve valve not working. - part of Inlet Control 2.
  • Page 70 Annual Maintenance It is essential that the cylinder unit is serviced at least once a year by a qualified individual. Any spare parts required should be purchased from Mitsubishi Electric. NEVER bypass safety devices or operate the unit without them being fully operational.
  • Page 71 10-6. Checking Component Parts Function <Continued from the previous page.> Checkpoints <Water circulation pump (primary circuit) characteristics> E*PT17X series E*PT20/30X series Speed 5 (Default setting) Speed 5 (Default setting) Speed 4 Speed 4 Speed 3 Speed 3 Speed 2 Speed 2 Speed 1 Speed 1 Flow rate [L/min]...
  • Page 72 Part Name Checkpoints Water circulation pump Measure the resistance between the terminals with a multimeter. (sanitary circuit) (Winding temperate 20°C) Terminal Normal (speed 2) Abnormal 211 Ω Open or Short DHW circulation pump MUST be set to speed 2. Immersion heater Measure the resistance between the terminals with a multimeter.
  • Page 73 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 A1 A2...
  • Page 74 <Thermistor Characteristics Charts> • Room temperature thermistor (TH1) • Liquid refrigerant temperature thermistor (TH2) • Flow water temperature thermistor (THW1) • Return water temperature thermistor (THW2) • DHW tank temperature thermistor (THW5) • Zone1 flow water temperature thermistor (THW6) • Zone1 return water temperature thermistor (THW7) •...
  • Page 75 10-7. Test point diagram FTC (Controller board) (Except E*ST***-*M*BE) 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 (230 VAC) (Local supply) (230 VAC) CNP4 (OUT14) Water circulation pump4 (230 VAC)
  • Page 76 FTC (Controller board) E*ST***-*M*BE CNP1/OUT1 (TBO.1 1-2) Water circulation pump1 (230 VAC) CNP23 Water circulation pump CN01 (1-3: pump2 230 VAC) Power supply (5-7: pump3 230 VAC) (230 VAC) CNP4 (OUT14) Water circulation pump4 (230 VAC) 10 A/250 V CNM2 Mixing valve2 (1-3[Open]: 230 VAC) 6.3 A/250 V...

  • Page 77: 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 cylinder and outdoor unit, turn off all the power-supply breaker. ● Discharge the condenser before the work involving the electric parts. ●...
  • Page 78 PHOTOS/FIGURES DISASSEMBLY PROCEDURE 3. How to remove the electrical parts Photo 3-1 Earth leakage circuit (Step (1) is applied to all the following parts.) Control box breaker (ECB1) Controller board (1) Remove the front panel. (Refer to Procedure 1.) <Earth leakage circuit breaker> (Photo 3-1) (2) Disconnect all the lead wires from the earth leakage cir- cuit breaker.
  • Page 79 PHOTOS/FIGURES DISASSEMBLY PROCEDURE Photo 4-1 4. How to remove the control box (1) Remove the front panel. (Refer to Procedure 1.) Screw Bracket (L) Cable clamp Bracket (R) (2) Disconnect only the lead wires in the control box that Screw connect to the components in the cylinder unit.
  • Page 80 DISASSEMBLY PROCEDURE PHOTOS/FIGURES 5. How to remove water pump (primary circuit)/pump Photo 5-1 elbow and G1-QRC Adapter/magnetic filter and G1-QRC Adapter Magnetic filter Quick connection <Water pump> O-ring (1) Remove the front panel. (Refer to Procedure 1.) Magnetic (2) Disconnect the CNP1 connector, the earth cable and the filter stay Flow direction CNPWM connector on the controller board.
  • Page 81 From the previous page. DISASSEMBLY PROCEDURE PHOTOS/FIGURES <Magnetic filter and G1-QRC Adapter> Photo 5-5 Cover Strainer mesh (inside) (5) Remove the 2 screws on the magnetic filter stay. (Photo 5-1) (6) Remove the magnetic filter by detaching the quick con- nection.
  • Page 82 EHPT30X-YM9EE ERST30D-YM9EE Controller board Control box No.4 BHC2-2 ERPT30X-YM9EE ERST20F-YM9E EHST17D-YM9E ERST20F-TM9E No.5 BHC2-4 EHST20D-TM9E ERST30F-YM9EE EHST20D-YM9E ERST30F-TM9EE No.6 BHC2-6 EHPT17X-VM2E ERST17D-VM2E No.1 BHC1-2 ERPT17X-VM2E ERST20C-VM2E No.2 BHC1-4 ERPT20X-VM2E ERST20D-VM2E ERPT30X-VM2EE ERST30C-VM2EE EHST17D-VM2E ERST30D-VM2EE EHST20D-VM2E ERST20F-VM2E ERST17D-VM2BE ERST30F-VM2EE Refer to 6. WIRING DIAGRAM BHC1 (3) <E*ST**D/F series>...
  • Page 83 From the previous page. DISASSEMBLY PROCEDURE PHOTOS/FIGURES (4) Remove the DIV frame by removing the 2 screws on it. (Photo 8-2) (Only E**T20/30* series) Remove the DIV frame by cutting the band and removing the 4 screws on it. (Photo 10-6) (Only ERST17D-***BE model) (5) Detach the quick connection of inlet of booster heater.
  • Page 84 From the previous page. DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 8-3 (7) Remove the 2 screws that hold the heater stay onto the front frame (L). Lift the booster heater slightly and remove the booster heater with the heater stay from the front frame (L).
  • Page 85 DISASSEMBLY PROCEDURE PHOTOS/FIGURES 10. How to remove the plate heat exchanger (P-HEX) Photo 10-1 DIV frame (Refrigerant - Water) <E*ST**C/D/F series> (1) Pump down the refrigerant circuit and close the stop Cable valve at the outdoor unit side. strap (Refer to 12. SUPPLEMENTARY INFORMATION.) Fastener (2) Remove the front panel.
  • Page 86 From the previous page. PHOTOS/FIGURES DISASSEMBLY PROCEDURE 10. How to remove the plate heat exchanger (P-HEX) Photo 10-4 (Refrigerant - Water) Expansion vessel (7) Remove the thermistor (TH2) from the thermistor holder. (Refer to Procedure 20.) (8) Remove the manometer with the manometer cover. (Refer to Procedure 12.) (9) Loosen the flare nuts for Air vent (automatic) and pressure relief valve (3 bar), and remove the Air vent...
  • Page 87 DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 12-1 12. How to remove the pressure relief valve/manometer/air vent (automatic) Manometer (1) Remove the front panel. (Refer to Procedure 1.) Manometer connection (G1/4") Manometer stay (2) Swing the control box to the front. (Refer to Procedure 4.) <Manometer>...
  • Page 88 From the previous page. DISASSEMBLY PROCEDURE PHOTOS/FIGURES 12. How to remove the pressure relief valve/manometer/air Photo 12-4 Pressure relief Air vent vent (automatic) valve (3 bar) (automatic) <Pressure relief valve (3 bar)> (3) Remove the field piping from the pressure relief valve (3 bar).
  • Page 89 DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 13-1 13. How to remove the expansion vessel (1) Remove the front panel. (Refer to Procedure 1.) Expansion vessel Flare joint Flare nut (2) Swing the control box to the front. (Refer to Procedure 4.) (3) Remove the flare nut using 2 spanners: one to hold the flare joint and the other to turn the flare nut.
  • Page 90 DISASSEMBLY PROCEDURE PHOTOS/FIGURES 15. How to remove the drain cock (primary circuit) Photo 15-1 (1) Remove the front panel. (Refer to Procedure 1.) <Pump elbow side> (2) Remove the drain cock from the pump elbow by turning the drain cock. (E**T**X/C series) Refer to Photo 15-1.
  • Page 91 DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 17-1 17. How to remove the plate heat exchanger (P-HEX) <Water - Water> Gasket (G3/4") Nut (G3/4") (1) Remove the front panel. (Refer to Procedure 1.) (2) Drain water in the P-HEX (Water-Water) using the drain (G3/4") cock (Primary circuit) and the drain cock (Sanitary circuit).
  • Page 92 PHOTOS/FIGURES DISASSEMBLY PROCEDURE 19. How to remove the scale trap (sanitary circuit) (1) Remove the front panel. (Refer to Procedure 1.) (2) Disconnect the CNP4 connector and the earth cable in the control box. (Photo 4-2) (3) Release the water pump lead wire from the cable clamp and the cable strap in the control box, the cable strap, the fastener and the band below the control box.
  • Page 93 DISASSEMBLY PROCEDURE PHOTOS/FIGURES 20. How to remove the liquid refrigerant temp. thermistor Photo 20-1 (TH2) / flow water temp. & return water temp. thermis- Thermistor Thermistor Thermistor tors (THW1,THW2) /tank water temp. thermistor <THW1> <THW5B> <THW5A> (THW5A, 5B) (1) Remove the front panel. (Refer to Procedure 1) (2) Disconnect the following thermistor connectors on the controller board and release the lead wires from cable Band...
  • Page 94 DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 21-1 21. How to remove the side panels (1) Remove the front panel. (Refer to Procedure 1.) Side panel (Right) (2) Remove the 4 screws on the top panel, and remove the 2 screws that hold the top panel onto the back panel. (Photos 21-2 and 23-1) (3) Remove the side panel (right) by removing the screw fix- ing the side panel (right).
  • Page 95 DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 23-1 23. How to remove the back panel (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the side panels. (Refer to Procedure 21.) (3) Remove the 4 screws on the back panel, and remove the Top panel Screws (Top panel) 2 screws that hold the back panel onto the frame.
  • Page 96 DISASSEMBLY PROCEDURE PHOTOS/FIGURES 24. How to detach and attach the quick connection Photo 24-1 Refer to the following steps when detaching and attaching the quick connection. (1) Remove the clip. (Photos 24-1 and 24-2) (2) Separate the connected parts to remove the O-ring. (Photo 24-3) •...
  • Page 97 DISASSEMBLY PROCEDURE PHOTOS/FIGURES How to remove the multi function group (ERST17D- Photo 25 ***BE model) Same diameter Same diameter Multi function group quick connection quick connection (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the DIV frame by cutting the band and removing the 4 screws on it.(Photo 10-6) (3) Remove the multi function group by detaching the same diameter quick connection.
  • Page 98 DISASSEMBLY PROCEDURE PHOTOS/FIGURES How to remove the mixing valve (ERST17D-***BE Photo 27-1 model) (1) Remove the front panel. (Refer to Procedure 1.) Mixing valve motor the relay connector (2) Disconnect (Mixing valve) under the control box. (Photo 4-4) (3) Release the water pump lead wire from the cable clamp, the fastener and the cable strap in the control box, and the cable strap, the fastener and the band below the control box.
  • Page 99 DISASSEMBLY PROCEDURE PHOTOS/FIGURES 29. How to remove the zone1 flow water temp. & zone1 return Photo 29 water temp. thermistors (THW6, THW7) /zone2 flow water temp. & zone2 return water temp. thermistors (THW8, Thermistor <THW6> Thermistor <THW9> THW9) (ERST17D-***BE model) Band (1) Remove the front panel.

  • Page 100: Supplementary Information

    *3 Boiler heating is controlled on/off by the room temperature thermostat. *4 [Hybrid] automatically switches heat sources between heat pump (and electric heater) and boiler. Mitsubishi Electric Erp Directive Related Product Information: erp.mitsubishielectric.eu/erp Details and precautions on installation, maintenance and assembly can be found in the installation and or operation manuals.

  • Page 101: Service And Maintenance

    SERVICE AND MAINTENANCE 13-1. Engineers Forms Should settings be changed from default, please enter and record new setting in ‘Commissioning/Field settings record sheet’ below. This will ease resetting in the future should the system use change or the circuit board need to be replaced. Commissioning/Field settings record sheet Field Main remote controller screen...
  • Page 102 13-1. Engineers Forms Commissioning/Field settings record sheet Default Field Main remote controller screen Parameters Notes setting setting Menu Service Thermistor adjustment THW1 −10°C to +10°C 0°C THW2 −10°C to +10°C 0°C THW5B −10°C to +10°C 0°C THW6 −10°C to +10°C 0°C THW7 −10°C to +10°C...
  • Page 103 13-1. Engineers Forms Commissioning/Field settings record sheet (continued from the previous page) Default Field Main remote controller screen Parameters Notes setting setting Menu Service Operation Smart grid ready On/Off settings Target temp. (+1 to +30°C) / -- (Non active) Heating On/Off Target temp.
  • Page 104 13-1. Engineers Forms Commissioning/Field settings record sheet (continued from the previous page) Default Field Main remote controller screen Parameters setting Notes setting Service Energy Electric heater Booster heater 1 0 to 30 kW 2 kW Menu monitor capacity Booster heater 2 0 to 30 kW 4 kW settings...
  • Page 105 Annual Maintenance Log Book Contractor name Engineer name Site name Site number Cylinder unit maintenance record sheet Warranty number Model number Serial number Mechanical Frequency Notes Turn OFF water supply, drain DHW tank, remove mesh from strainer clean and replace in strainer. *1 Keep water supply OFF, open hot water taps and check the primary-side expansion vessel charge pressure.
  • Page 106 13-2. Annual Maintenance (cylinder unit and hydrobox) It is essential that the indoor unit is serviced at least once a year by a qualified individual. Any required parts should be purchased from Mitsubishi Electric. NEVER by- pass safety devices or operate the unit without them being fully operational. For more details, refer to service handbook.
  • Page 107 <Draining particles from the magnetic filter> WARNING: DRAINED WATER MAY BE VERY HOT 1. Turn OFF the unit via the user interface. 2. Turn OFF the circuit breaker. 3. Check if body of the magnet filter is still screwed tight (a). 4.
  • Page 108 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN ©Copyright 2023 MITSUBISHI ELECTRIC CORPORATION Issued: Aug. 2023 No. OCH814A Published: Jun. 2023 No. OCH814 Made in Japan Specifications are subject to change without notice.

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