Mitsubishi Electric EHPT17X-VM2D Service Manual
  1. Manuals
  2. Brands
  3. Mitsubishi Electric Manuals
  4. Air Conditioner
  5. ecodan EHPT17X-VM2D
  6. Service manual

Mitsubishi Electric EHPT17X-VM2D Service Manual

Cylinder unit
Hide thumbs Also See for EHPT17X-VM2D:

Advertisement

Table of Contents

CYLINDER UNIT
SERVICE MANUAL
[Model Name]
EHPT17X-VM2D
EHPT17X-VM6D
EHPT17X-YM9D
EHPT20X-MED
EHPT20X-MHEDW
EHPT20X-TM9D
EHPT20X-VM6D
EHPT20X-YM9D
EHPT20X-YM9ED
EHPT30X-MED
EHPT30X-YM9ED
EHST17D-VM2D
EHST17D-YM9D
EHST20C-MED
EHST20C-TM9D
EHST20C-VM2D
EHST20C-VM6D
EHST20C-YM9D
EHST20C-YM9ED
[Service Ref.]
Refer to page 2.
CYLINDER UNIT
EHST20D-MED
EHST20D-TM9D
EHST20D-VM2D
EHST20D-VM6D
EHST20D-YM9D
EHST20D-YM9ED
EHST30C-MED
EHST30C-TM9ED
EHST30C-VM6ED
EHST30C-YM9ED
EHST30D-MED
EHST30D-TM9ED
EHST30D-VM6ED
EHST30D-YM9ED
ERPT17X-VM2D
ERPT20X-MD
ERPT20X-VM2D
ERPT20X-VM6D
ERPT30X-VM2ED
MAIN REMOTE
CONTROLLER
ERST17D-VM2BD
ERST17D-VM2D
ERST17D-VM6BD
ERST17D-VM6D
ERST17D-YM9BD
ERST20C-VM2D
ERST20C-VM6D
ERST20C-YM9D
ERST20D-VM2D
ERST20D-VM6D
ERST20D-YM9D
ERST30C-VM2ED
ERST30C-VM6ED
ERST30C-YM9ED
ERST30D-VM2ED
ERST30D-VM6ED
ERST30D-YM9ED
CONTENTS
TECHNICAL CHANGES ······························· 3
1. REFERENCE MANUAL ···························· 4
2. SAFETY PRECAUTION ··························· 5
3. SPECIFICATIONS ···································· 7
4. PART NAMES AND FUNCTIONS ·········· 11
5. OUTLINES AND DIMENSIONS ·············· 14
6. WIRING DIAGRAM ································· 16
7. FIELD WIRING ········································ 25
8. WATER SYSTEM DIAGRAM ·················· 29
9. CONTROLS ············································ 33
10. TROUBLESHOOTING ···························· 54
11. DISASSEMBLY PROCEDURE ··············· 72
13. SERVICE AND MAINTENANCE ············ 97
PARTS CATALOG (OCB714)
November 2021
No. OCH714
REVISED EDITION-D
Revision:
・
ERST17D-VM2BD.UK,
ERST17D-VM6BD.UK and
ERST17D-YM9BD.UK
have been added in
REVISED-EDITION-D.
OCH714C is void.
Note:
・ This manual describes service
data of cylinder unit only.

Advertisement

Table of Contents
loading

Related Manuals for Mitsubishi Electric EHPT17X-VM2D

Summary of Contents for Mitsubishi Electric EHPT17X-VM2D

  • Page 1: Table Of Contents

    CYLINDER UNIT November 2021 No. OCH714 SERVICE MANUAL REVISED EDITION-D [Model Name] EHPT17X-VM2D EHST20D-MED ERST17D-VM2BD Revision: EHPT17X-VM6D EHST20D-TM9D ERST17D-VM2D ・ ERST17D-VM2BD.UK, EHPT17X-YM9D EHST20D-VM2D ERST17D-VM6BD.UK and ERST17D-VM6BD ERST17D-YM9BD.UK EHPT20X-MED EHST20D-VM6D ERST17D-VM6D have been added in REVISED-EDITION-D. EHPT20X-MHEDW EHST20D-YM9D ERST17D-YM9BD EHPT20X-TM9D EHST20D-YM9ED ERST20C-VM2D OCH714C is void.
  • Page 2 [Service Ref.] EHST20D-VM2DR1.UK ERST20C-VM6DR1.UK EHPT17X-VM2D.UK ERST20C-YM9DR1.UK EHST20D-VM6D.UK EHPT17X-VM2DR1.UK ERST20D-VM2D.UK EHST20D-VM6DR1.UK EHPT17X-VM6D.UK ERST20D-VM2DR1.UK EHST20D-YM9D.UK EHPT17X-VM6DR1.UK ERST20D-VM6DR1.UK EHST20D-YM9DR1.UK EHPT17X-YM9D.UK ERST20D-YM9DR1.UK EHST20D-YM9ED.UK EHPT17X-YM9DR1.UK ERST30C-VM2ED.UK EHST20D-YM9EDR1.UK EHPT20X-MED.UK EHST30C-MED.UK ERST30C-VM2EDR1.UK EHPT20X-MEDR1.UK EHST30C-MEDR1.UK ERST30C-VM6EDR1.UK EHPT20X-MHEDW.UK EHST30C-TM9ED.UK ERST30C-YM9EDR1.UK EHPT20X-MHEDWR1.UK EHST30C-TM9EDR1.UK ERST30D-VM2ED.UK EHPT20X-TM9D.UK EHST30C-VM6ED.UK ERST30D-VM2EDR1.UK EHPT20X-TM9DR1.UK EHST30C-VM6EDR1.UK ERST30D-VM6EDR1.UK EHPT20X-VM6D.UK...

  • Page 3: Technical Changes

    EHST20C-VM6D.UK EHST20C-YM9DR1.UK EHST20C-YM9D.UK EHST20C-YM9EDR1.UK EHST20C-YM9ED.UK EHST20C-TM9DR1.UK EHST20C-TM9D.UK ERST20C-VM2DR1.UK ERST20C-VM2D.UK EHST30C-MEDR1.UK EHST30C-MED.UK EHST30C-VM6EDR1.UK EHST30C-VM6ED.UK EHST30C-YM9EDR1.UK EHST30C-YM9ED.UK EHST30C-TM9EDR1.UK EHST30C-TM9ED.UK ERST30C-VM2EDR1.UK ERST30C-VM2ED.UK EHPT17X-VM2DR1.UK EHPT17X-VM2D.UK EHPT17X-VM6DR1.UK EHPT17X-VM6D.UK EHPT17X-YM9DR1.UK EHPT17X-YM9D.UK ERPT17X-VM2DR1.UK ERPT17X-VM2D.UK EHPT20X-MEDR1.UK EHPT20X-MED.UK EHPT20X-VM6DR1.UK EHPT20X-VM6D.UK EHPT20X-YM9DR1.UK EHPT20X-YM9D.UK EHPT20X-YM9EDR1.UK EHPT20X-YM9ED.UK EHPT20X-TM9DR1.UK EHPT20X-TM9D.UK EHPT20X-MHEDWR1.UK EHPT20X-MHEDW.UK ERPT20X-MDR1.UK ERPT20X-MD.UK...

  • Page 4: 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-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 PUHZ-SW75YAA-SC.UK PUHZ-SW100VAA(-BS).UK PUHZ-SW100YAA(-BS).UK PUMY-P112VKM4R4(-BS).UK PUMY-P125VKM4R4(-BS).UK PUMY-P140VKM4R4(-BS).UK PUMY-P112YKM4R4(-BS).UK...

  • Page 5: Safety Precaution

    Do not position furniture or electrical appliances below 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 6 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 7: Specifications

    SPECIFICATIONS OCH714D...
  • Page 8 OCH714D...
  • Page 9 OCH714D...
  • Page 10 OCH714D...

  • Page 11: Part Names And Functions

    PART NAMES AND FUNCTIONS <E**T***-*M**D> (Packaged model system) (Split model system) (Split model 2 zone system) Note: For installation of all E**T***-*M*ED* models, make sure to install a suitably sized primary-side expansion vessel. (See figure 8.1 - 8.5 and 10.6.1 for further guidance) <Figure 4.1>...
  • Page 12 EHST17/20D- EHST20/30D- EHST20/30D- EHST20C- EHST20/30C- EHST20/30C- ERST17/20D- ERST17D- ERST30D- Part name *M*D *M*ED *M*D *M*ED *M*D *M*BD *M*ED 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 13 ERST20C- ERST30C- EHPT17/20X- EHPT20/30X- EHPT20/30X- ERPT17/20X- ERPT20X- ERPT30X- EHPT20X- Part name *M*D *M*ED *M*D *M*ED *M*D VM*ED MHEDW 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 14: Outlines And Dimensions

    OUTLINES AND DIMENSIONS 5-1. Technical Drawings <E**T***-*M**D> <Unit: mm> (Packaged model system) 67.8 DHW tank <E*PT30X-*M*ED> <EHPT20X-MHEDW> 170L 200L 300L 442.3 capacity 515.7 542.3 1400 1600 2050 PRESSURE TEMPERATURE & RELIEF VALVE HANDLE PRESSURE (SANITARY CIRCUIT) AIR VENT RELIEF VALVE G1/2 MANOMETER MAIN...
  • Page 15 (Split model 2 zone system) DHW FLOW (G3/4) COLD WATER INLET (G3/4) REFRIGERANT(GAS) REFRIGERANT(LIQUID) 67.9 FLOW ZONE 1 (G1) FLOW ZONE 2 (G1) 334.9 414.9 470.7 510.7 ELECTRICAL CABLE INLETS RETURN ZONE 1(G1) RETURN ZONE 2(G1) PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE (PRIMARY CIRCUIT)

  • Page 16: Wiring Diagram

    WIRING DIAGRAM 6-1. E**T***-VM2(E)D 3-way valve (AC motor) (E*PT20/30X-*M**D*, E*ST**C/30D-*M**D) Table 6.9.1 3-way valve (Stepping motor) (E*PT17X-*M**D*, E*ST17/20D-*M**D) Table 6.9.1 Table 6.9.1 Table 6.9.1 Table 6.9.1 6.9.1 OCH714D...
  • Page 17 6-2. E**T***-VM6(E)D 3-way valve (AC motor) (E*PT20/30X-*M**D*, E*ST**C/30D-*M**D) 3-way valve (Stepping motor) Table 6.9.1 (E*PT17X-*M**D*, E*ST17/20D-*M**D) Table 6.9.1 Table 6.9.1 Table 6.9.1 Table 6.9.1 6.9.1 OCH714D...
  • Page 18 6-3. E**T***-YM9(E)D 3-way valve (AC motor) Table 6.9.1 (E*PT20/30X-*M**D*, E*ST**C/30D-*M**D) 3-way valve (Stepping motor) Table 6.9.1 (E*PT17X-*M**D*, E*ST17/20D-*M**D) Table 6.9.1 Table 6.9.1 Table 6.9.1 6.9.1 OCH714D...
  • Page 19 6-4. E**T***-M(E)D Table 6.9.1 3-way valve (AC motor) Table 6.9.1 (E*PT20/30X-*M**D*, E*ST**C/30D-*M**D) 3-way valve (Stepping motor) Table 6.9.1 (E*PT17X-*M**D*, E*ST17/20D-*M**D) Table 6.9.1 Table 6.9.1 6.9.1 OCH714D...
  • Page 20 6-5. EH*T***-TM9(E)D 3-way valve (AC motor) (E*PT20/30X-*M**D*, E*ST**C/30D-*M**D) Table 6.9.1 3-way valve (Stepping motor) (E*PT17X-*M**D*, E*ST17/20D-*M**D) Table 6.9.1 Table 6.9.1 Table 6.9.1 Table 6.9.1 6.9.1 OCH714D...
  • Page 21 6-6. ERST17D-VM2BD Indoor unit powered Indoor unit powered CNPWM CN01 by independent source via outdoor unit (WH) (BK) Power supply <How to use TBO.1 to 4> To outdoor To outdoor Power supply to Booster heater Connect them using either way as shown below. unit ~/N 230V 50Hz unit...
  • Page 22 6-7. ERST17D-VM6BD Indoor unit powered Indoor unit powered CNPWM CN01 by independent source via outdoor unit (WH) (BK) <How to use TBO.1 to 4> Power supply To outdoor Power supply To outdoor Connect them using either way as shown below. unit ~/N 230V 50Hz unit...
  • Page 23 6-8. ERST17D-YM9BD Indoor unit powered Indoor unit powered CNPWM CN01 by independent source via outdoor unit (WH) (BK) Power supply <How to use TBO.1 to 4> to Booster heater To outdoor Power supply To outdoor Connect them using either way as shown below. unit unit 3~ 400V 50Hz...
  • Page 24 6-9. 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. DIP switch settings are listed below in Table 6.6.1.

  • Page 25: Field Wiring

    FIELD WIRING Breaker abbreviation Meaning ECB1 Earth leakage circuit breaker for booster heater ECB2 Earth leakage circuit breaker for immersion heater Terminal block 1 Option 1: Cylinder unit powered via outdoor unit (If you want to use independent source, go to the Mitsubishi website.) <1 phase>...
  • Page 26 <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 27 Option 2: Cylinder unit powered by independent source. If the cylinder unit and outdoor unit have separate power supplies, the following Initial settings requirements MUST be carried out: White (Power supplied by CN01 outdoor unit) • Change the interconnected wiring in the control and electrical box of the Cylinder unit cylinder unit (see Figure 7-3).
  • Page 28 <3 phase> Affix label B that is included with the manuals near each wiring diagram for cylinder unit and outdoor units. Cylinder unit Wiring Earth circuit leakage breaker circuit To control Power supply breaker board Isolating ~/N 230 V 50 Hz *1, *2 switch Outdoor unit...

  • Page 29: Water System Diagram

    WATER SYSTEM DIAGRAM *a. Refer to the following section [Local system]. <E*PT17X-*M*D> (Packaged model system) *b. If the outdoor unit is higher than the indoor Water flow unit, or if there is a location where air gets trapped in the upper part of the water pipe, consider adding this part.
  • Page 30 Go to the Mitsubishi website to check the compo- <E*PT20/30X-*M**D> (Packaged model system) Water flow nent parts of each unit. *a. Refer to the following section [Local system]. Cold water *b. If the outdoor unit is higher than the indoor unit, or if there is a location where air gets trapped in the upper part of the water pipe, consider adding this part.
  • Page 31 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 32 Filling the cylinder unit (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 system of all debris. (Refer to 4.2 in the installation manual.) 5.

  • Page 33: Controls

    The following is a guide to viewing the main settings. Should you require more modifications. Back Return to previous menu. information please contact your installer or local Mitsubishi Electric dealer. Confirm Used to select or save. (Enter key) Cooling mode is available for ERS series only. However, Cooling mode is not Power/Holiday If system is switched off pressing once will turn available when the indoor unit is connected to PUHZ-FRP.
  • Page 34 9-2. Setting the Main remote controller After the power has been connected to the outdoor and cylinder units (See "7. FIELD WIRING"), the initial system settings can be entered via the main remote control- ler. 1. Check all breakers and other safety devices are correctly installed and turn on power to the system. 2.
  • Page 35 <Main Remote Controller Menu Tree> Initial Unrestricted access Installer only Main screen * Short press for 1 Zone system. Long press Information Option Forced DHW ON ( )/OFF ON ( )/Prohibited ( )/Timer ( ) Heating/Cooling ON ( )/Prohibited ( )/Timer ( ) Energy monitor Consumed electrical energy Menu...
  • Page 36 <Continued from the previous page.> <Main Controller Menu Tree> Unrestricted access Initial Installer only Main screen Main Long press menu Manual operation Menu Function settings Service Thermistor adjustment Password ON/OFF protected Economy settings for pump Delay ON/OFF Electric heater (Heating) Delay ON/OFF (Booster heater/Immersion heater) Auxiliary settings...
  • Page 37 <Continued from the previous page.> <Main Controller Menu Tree> Unrestricted access Initial Installer only Main screen Main menu Long press Menu Booster heater 1 capacity Electric heater Booster heater 2 capacity capacity Immersion heater Analog output Pump 1 Water pump input Energy monitor Pump 2 settings...
  • Page 38 9-5. 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 39 <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.) 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 40 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 41 <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 42 0 kW 0 kW 0 kW ERST30C-YM9ED 3 kW 6 kW 0 kW EHST20D-VM2D 2 kW 0 kW 0 kW EHPT17X-VM2D 2 kW 0 kW 0 kW EHST20D-VM6D 2 kW 4 kW 0 kW EHPT17X-VM6D 2 kW 4 kW 0 kW...
  • Page 43 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 44 <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 45 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 46 <Table 9.5.3> 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 47 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 48 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 49 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 50 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 51 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 52 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 53 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 54: 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 55 10-4. Self-diagnosis and action Check if DIP SW is set correctly. (Refer to "6-9. 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 56 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 57 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 58 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 2.
  • Page 59 Check code Title and display conditions Possible Cause Diagnosis and action <Defrosting> <Defrosting> THW2 detects a temperature ≤15ºC and TH2 1. Reduced water flow 1., 2. Check water piping. detects a temperature ≤−16ºC for consecutive 10 • Clogged filter seconds. •...
  • Page 60 Check code Title and display conditions Possible Cause Diagnosis and action E1/E2 Main remote controller control board failure 1. Fault with the main remote controller 1. Replace main remote controller circuit Check code E1 displayed if main remote control- circuit board board.
  • Page 61 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 62 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 63 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 64 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 65 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 66 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 67 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 68 10-6. Checking Component Parts' Function Part Name Checkpoints Water circulation pump (primary circuit) <Water circulation pump (primary circuit) characteristics> BROWN PWM input signal Signal cable BLUE Signal ref. BLACK E*PT17X series Feedback signal BROWN Speed 5 (Default setting) Speed 4 BLUE Speed 3 Power cable...
  • Page 69 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 70 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 71 <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 72 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 (230 VAC) CN01 OUT3 (TBO.1 5-6) Power supply Water circulation pump3 (230 VAC) (230 VAC) CNP4 (OUT14) Water circulation pump4 (230 VAC) 10 A/250 V OUT5 (TBO.2 1-3)

  • Page 73: 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 74 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 75 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 76 DISASSEMBLY PROCEDURE PHOTOS/FIGURES 5. How to remove water pump (primary circuit)/pump valve/ Photo 5-1 strainer valve <Water pump> Strainer Quick connection Close the pump valve (OFF) before removing the water pump, valve O-ring and open the valves (ON) after reinstalling the water pump. Strainer (1) Remove the front panel.
  • Page 77 From the previous page. DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 5-5 Cover Strainer mesh (inside) <Strainer valve> (6) Remove the 2 screws on the strainer valve stay. (Photo 5-1) (7) Remove the strainer valve by detaching the quick con- nection. • When reinstalling the quick connection, use a new O-ring.
  • Page 78 EHPT20X-YM9D No.5 BHC2-V EHST30D-YM9ED EHPT20X-YM9ED EHST30D-TM9ED EHPT20X-TM9D ERST30D-YM9ED EHPT30X-YM9ED EHST20C-YM9D ERST20D-YM9BD No.6 BHC2-W EHST20C-YM9ED EHST20C-TM9D ERST20C-YM9D BHC1 EHST17D-VM2D EHPT17X-VM2D No.1 BHC1-U BHC2 ERST17D-VM2D ERPT17X-VM2D No.2 BHC1-V EHST20D-VM2D ERPT20X-VM2D ERST20D-VM2D ERPT30X-VM2ED ERST30D-VM2ED ERST17D-VM2BD EHST20C-VM2D ERST20C-VM2D ERST30C-VM2ED Refer to 6. WIRING DIAGRAM Cable straps Note: The photos shown are of the EHST20C-VM6D model.
  • Page 79 From the previous page. DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 8-3 (3) Remove the DIV frame by removing the 2 screws on it. Booster heater O-ring (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-***BD model) (4) Close (OFF) the pump valve.
  • Page 80 From the previous page. DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 8-4 (9) 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 81 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 series> (1) Pump down the refrigerant circuit and close the stop valve at the outdoor unit side. Cable strap (Refer to 12. SUPPLEMENTARY INFORMATION.) (2) Remove the front panel.
  • Page 82 From the previous page. DISASSEMBLY PROCEDURE PHOTOS/FIGURES 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 21.) (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 83 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 84 From the previous page. DISASSEMBLY PROCEDURE PHOTOS/FIGURES 12. How to remove the pressure relief valve/manometer/air Photo 12-4 Air vent vent (automatic) (automatic) Pressure relief valve (3 bar) <Pressure relief valve (3 bar)> (3) Remove the field piping from the pressure relief valve (3 bar).
  • Page 85 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 2 tapes. (Photo 13-1) •...
  • Page 86 DISASSEMBLY PROCEDURE PHOTOS/FIGURES 16. How to remove the drain cock (primary circuit) Photo 16-1 (1) Remove the front panel. (Refer to Procedure 1.) <Pump valve side> (2) Remove the drain cock from the pump valve by turning the drain cock. (Photo 16-1) <Pipe side (for P-HEX)>...
  • Page 87 DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 18-1 18. 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 cock (Primary circuit) and the drain cock (Sanitary circuit).
  • Page 88 PHOTOS/FIGURES DISASSEMBLY PROCEDURE 20. How to remove the scale trap (sanitary circuit) Photo 20-1 (1) Remove the front panel. (Refer to Procedure 1.) (2) Disconnect the CNP4 connector and the earth cable in the control box. (Photo 4-1) Screw fixing the (3) Release the water pump lead wire from the cable clamp S.T.-W.P.
  • Page 89 DISASSEMBLY PROCEDURE PHOTOS/FIGURES 21. How to remove the liquid refrigerant temp. thermistor Photo 21-1 (TH2) /flow water temp. & return water temp. thermis- Thermistor Thermistor <THW5A> tors (THW1,THW2) /tank water temp. thermistor (THW5) <THW5B> (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 clamps and bands.
  • Page 90 DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 22-1 22. 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 22-2 and 24-1) (3) Remove the side panel (right) by removing the screw fix- ing the side panel (right).
  • Page 91 DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 24-1 24. How to remove the back panel (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the side panels. (Refer to Procedure 22.) (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 92 DISASSEMBLY PROCEDURE PHOTOS/FIGURES 25. How to detach and attach the quick connection Photo 25-1 Refer to the following steps when detaching and attaching the quick connection. (1) Remove the clip. (Photos 25-1 and 25-2) (2) Separate the connected parts to remove the O-ring. (Photo 25-3) •...
  • Page 93 DISASSEMBLY PROCEDURE PHOTOS/FIGURES How to remove the multi function group (ERST17D- Photo 26 ***BD model) Same diameter Same diameter (1) Remove the front panel. (Refer to Procedure 1.) Multi function group quick connection quick connection (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 94 DISASSEMBLY PROCEDURE PHOTOS/FIGURES How to remove the mixing valve (ERST17D-***BD Photo 28-1 model) Mixing valve motor (1) Remove the front panel. (Refer to Procedure 1.) 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 95 DISASSEMBLY PROCEDURE PHOTOS/FIGURES 30. How to remove the zone1 flow water temp. & zone1 return Photo 30 water temp. thermistors (THW6, THW7) /zone2 flow water Thermistor <THW9> temp. & zone2 return water temp. thermistors (THW8, Band Thermistor <THW6> THW9) (ERST17D-***BD model) Thermistor <THW7>...
  • Page 96 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 tighten the parts to the specified tightening torques below.

  • Page 97: Supplementary Information

    SUPPLEMENTARY INFORMATION Refrigerant collecting (pumpdown) for split model systems only Refer to “Refrigerant collection” in the outdoor unit installation manual or service manual. 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 98: Service And Maintenance

    SERVICE AND MAINTENANCE Engineers Forms Should settings be changed from default, please enter and record new setting in ‘Field Setting’ column. 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 Main remote controller screen Parameters...
  • Page 99 Commissioning/Field settings record sheet (continued from the previous page) Default Field Main remote controller screen Parameters Notes setting setting Setting Service Pump speed Pump speed (1 to 5) Heating/Cooling Pump speed (1 to 5) menu Heat source setting Standard/Heater/Boiler/Hybrid *11 Standard Heat pump setting Heat pump flow rate...
  • Page 100 Commissioning/Field settings record sheet (continued from the previous page) Default Field Main remote controller screen Parameters Notes setting setting Service Energy Electric heater Booster heater 1 0 to 30 kW 2 kW monitor menu capacity capacity settings Booster heater 2 0 to 30 kW 4 kW capacity...
  • Page 101 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 102 <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 103 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued: Nov. 2021 No. OCH714 REVISED EDITION-D Issued: Jun. 2021 No. OCH714 REVISED EDITION-C Issued: Oct. 2020 No. OCH714 REVISED EDITION-B Issued: Mar. 2020 No. OCH714 REVISED EDITION-A Published: Nov.

This manual is also suitable for:

Ehpt17x-vm6dEhpt17x-ym9dEhpt20x-medEhpt20x-mhedwEhpt20x-tm9dEhpt20x-vm6d ... Show all

Table of Contents