Mitsubishi Electric ecodan EHPT20Q-VM2EA Service Manual Download Page 68

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GCH15010

PHOTOS

DISASSEMBLY PROCEDURE

Photo 11-7

Photo 11-8

Photo 11-9

From the previous page.

< Manometer >

(1) Remove the front panel.

(4) Install the drain cock hose at the drain cock of the
booster heater inlet (lower right), and drain
water.(Photo 11-9)

(2) Open the pressure relief valve cap and lower the
tank internal pressure.(Photo 11-3)

(3) Close(OFF) the pump valve and strainer
valve.(Photo 11-7 and 11-8)

When the pump valve/strainer valve handle is stiff,

use a tool to grip the handle and turn it carefully.

When opening or closing the pump valve/strainer

valve, ensure to do so fully, not halfway.

pump valve

strainer valve

hose

drain cock

Summary of Contents for ecodan EHPT20Q-VM2EA

Page 1: ...TIONS 5 5 OUTLINES AND DIMENSIONS 6 6 WIRING DIAGRAM 8 7 FIELD WIRING 11 8 WATER SYSTEM DIAGRAM 12 9 CONTROLS 14 10 TROUBLESHOOTING 36 11 DISASSEMBLY PROCEDURE 51 12 SERVICE AND MAINTENANCE 79 PARTS CATALOG GCB15010 Note This manual describes service data of cylinder unit only RoHS compliant products have G mark on the spec name plate Please void GCH15010 MAIN REMOTE CONTROLLER Cylinder Unit ...

Page 2: ...GCH15010 2 REFERENCE MANUAL 1 OUTDOOR UNIT S SERVICE MANUAL Service Ref Service Manual No QUHZ W40VA GHH15010 ...

Page 3: ...unit or the outdoor unit 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...

Page 4: ...dry run prevention Water circuit Thermal store tank Booster heater Primary circuit circulating pump Grundfos Solar PML 25 145 180 Thermal store and space heating Hot water supply Grundfos Solar PML 25 145 180 Connections φ 22 0 φ 22 0 Primary circuit Secondary potable circuit Target temperature range Space heating 25 60 C Maximum secondary potable water supply pressure 10 bar 1 MPa Maximum primary...

Page 5: ... controller Water pipe Space heating flow connection D EHPT20Q VM2EA 21 THW1 Flow water temp thermistor 22 THW2 Return water temp thermistor 23 Drain cock HEX Secondary Potable circuit 26 Drain cock For pump A 27 28 THW5B Stored water temp thermistor lower 29 THW3 Flow water temp thermistor 2 to tank Drain cock Booster heater THW5A Stored water temp thermistor upper 25 30 THW4 DHW supply temp ther...

Page 6: ...nnection No plate heat exchanger 22 mm Compression Space heating flow connection Booster heater inlet Power cable 230 V Run booster heater cable Main power inlet Power cable 230 V Run power cable Cylinder unit outdoor unit cable Power cable 230V Run cylinder unit outdoor unit cable Run output cable Signal input cable inlet Run signal input cables and remote sensor wires Wireless receiver and Wi Fi...

Page 7: ...e behind unit not visible 10 d 500 in National and Local Building Regulations The cylinder unit must be located indoors and in a frost free environment for example in a utility room to minimise heat loss from stored water in the right figure Sufficient space MUST be left for the provision of discharge pipework as detailed ...

Page 8: ...erminal block 2 Indoor unit and outdoor unit connecting wires have polarities make sure to match terminal numbers S1 S2 S3 for correct wirings 3 Since the outdoor unit side electric wiring may change be sure to check the outdoor unit electric wiring diagram for service Symbol Name TH1 Thermistor Room temp Option IN1 Room thermostat 1 Local supply THW1 Thermistor Flow water temp THW2 Thermistor Ret...

Page 9: ...ic elec WULFLW EXLOG XS KHQ WKH LV WXUQHG RII SXVK GRZQ WKH SRZHU OHYHU ZLWKRXW SUHVVLQJ WKH WHVW EXWWRQ Locally supplied wiring should be inserted through the inlets situated on the WRS RI WKH F OLQGHU XQLW 5HIHU WR 7DEOH When confirming the operation of the ECB make sure that the ECB can be turned ON OFF by the power lever before pressing the test button If the ECB cannot be turned ON OFF by the...

Page 10: ...r safety reasons this function is not available for certain errors In that case system operation MUST be stopped and only the water circulation pump keeps running 2 Space heating and DHW can be operated only in indoor unit like an electric boiler Refer to Installation manual 5 4 Indoor unit only operation 3 If emergency mode is no longer required return the switch to OFF position DIP switch Functi...

Page 11: ... unit S2 S3 2 5 5 5 4 N 230 V 50 Hz 16 A 3 Min 2 5 4 Min 2 5 230 V AC 230 V AC 24 V DC Note 1 Wiring size MUST comply with the applicable local and national codes 2 Cylinder unit outdoor unit connecting cables shall not be lighter than polychloroprene sheathed flexible cable Design 60245 IEC 57 Cylinder unit power supply cables shall not be lighter than polychloroprene sheathed flexible cable Desi...

Page 12: ...RQ N 9 3ULPDU WKHUPDO VWRUH FDSDFLW 7DQN FDSDFLW NJ Mass of the unit when full 0LQLPXP SULPDU ZRUNLQJ SUHVVXUH EDU N3D 1 Plate heat exchanger 2 Booster heater with thermostat 3 Drain cock Primary circuit 4 Drain cock Secondary Potable circuit 5 Pump valve 6 Water circulation pump 1 For thermal store and space heating 7 Water circulation pump A For hot water supply to plate heat exchanger 8 3 way v...

Page 13: ...hot water Note Make sure to turn OFF the booster heater power supply before filling the system 1RWH XWRPDWLF DLU YHQWV 0867 EH LQVWDOOHG DW WKH KLJKHVW SRLQW RI WKH SULPDU V VWHP 7KH VOLJKWHVW DPRXQW RI DLU LQ WKH V VWHP FDQ UHGXFH HIILFLHQFLHV DQG HYHQ FDXVH WKH F OLQGHU XQLW WR IDXOW RQILUP WKH IROORZLQJ LI WKH DLU FDQQRW EH GLVFKDUJHG LU GLVFKDUJLQJ RI UDGLDWRUV LU GLVFKDUJLQJ IURP LVRODWLQJ YD...

Page 14: ... pump is running Defrosting Emergency heating 2 Electric heater When this icon is displayed the Electric heaters booster heater are in use 3 Target temperature Target room temperature Target flow temperature Compensation curve 4 OPTION Pressing the function button below this icon will dis play the option screen 5 Increase desired temperature 6 Decrease desired temperature 7 Z1 Z2 Pressing the func...

Page 15: ... SRZHU WR WKH V VWHP KHQ WKH PDLQ FRQWUROOHU LV VZLWFKHG RQ IRU WKH ILUVW WLPH WKH VFUHHQ DXWRPDWLFDOO JRHV WR QLWLDO VHWWLQJV PHQX DWH 7LPH VHWWLQJ VFUHHQ 0DLQ FRQWUROOHU ZLOO DXWRPDWLFDOO VWDUW XS DLW DSSUR LPDWHO one minute whilst the control menus load KHQ WKH FRQWUROOHU LV UHDG D EODQN VFUHHQ ZLWK D OLQH UXQQLQJ DFURVV WKH WRS ZLOO EH GLVSOD HG 5 Press button E Power refer to page WR WXUQ RQ ...

Page 16: ...ating DHW DHW ON OFF DHW ON Prohibited Timer Heating ON Prohibited Timer Room temp Flow temp Compensation curve Compensation curve preview Compensation curve edit F1 F1 F2 F2 F4 F3 F3 F4 F3 F4 F3 F4 F2 F3 F4 DHW Date Time yyyy mm dd hh mm OFF Room Tank Room Tank OFF ON hh mm hh mm AM AM hh mm C F Room RC zone select Sensor setting Zone1 Zone1 Zone2 Holiday menu Heating room temp Heating room temp ...

Page 17: ...r history Password protection Manual reset SD card Heating operation H P thermo diff adjust Flow temp range Room temp control Auxiliary settings Heat source setting Pump speed Operation settings ON OFF Delay ON OFF Delay Flow t Outdoor ambient temp Electric heater capacity Main controller SD Yes No Select download data FTC Main RC SD Yes No Select upload data Water pump input Electric energy meter...

Page 18: ...y after power failure only Mode 1 Setting number meanings 1 Manual operation 2 Function settings 3 Thermistor adjustment 4 Auxiliary settings 5 Heat source setting 6 Pump speed 7 Operation settings 8 Energy monitor settings 9 External input settings 10 Running information 11 Thermistor reading 12 Summary of settings 13 Error history 14 Password protection 15 Manual reset 16 SD card 1 From the serv...

Page 19: ... to adjust the time period of heat pump only operation before the booster heater will assist in space heating 5 180 minutes Electric heater Heating screen Economy settings for pump screen THW1 Thermistor Flow water temp THW2 Thermistor Return water temp THW3 Thermistor Flow water temp to tank THW4 Thermistor DHW supply temp THW5A Thermistor Stored water temp upper THW5B Thermistor Stored water tem...

Page 20: ...2 Press CONFIRM 3 The Pump speed screen is displayed 4 Use F2 and F3 buttons to set the pump speed of the water circulation pump between 1 and 5 Heat source setting The default heat source setting is heat pump and booster heater present in the system to be operational This is referred to as Standard operation on the menu ...

Page 21: ...e set at normal mode This reduces the time to reach the target room temperature when the room temperature is relatively low 25 45 ºC 40 Maximum temp 35 60 ºC 50 Room temp control Mode Normal Fast Normal Interval 10 60 mins 10 Heat pump thermo diff adjust On Off On Off On Lower limit í í ºC í Upper limit 3 15 ºC Heating operation Room temp control table Note This function allows operational setting...

Page 22: ... 2 on the main controller 1 Monthly and Year to date 2 DHW operation Space heating Refer to 9 3 Main Settings Menu for how to check the energy and 6 2 DIP switch Functions for the details on DIP SW setting Either one of the following two method is used for monitoring Note The method 1 should be used as a guide If greater accuracy is required then method 2 should be used Electricity consumption is ...

Page 23: ...tion buttons to enter index code for the component to be viewed See the Table 9 4 1 for component index codes 5 Press CONFIRM 1 For multiple outdoor units control system only Thermistor reading This function shows the current readings of thermistors located on the water circuit Thermistor Description Thermistor Description TH1A Zone 1 room temperature THW6 Zone 1 flow water temperature TH1B Zone 2...

Page 24: ...Error history allows the service engineer to view previous Error codes the unit address and the date on which they occurred Up to 16 Error codes can be stored in the history the most recent Error event is displayed at the top of the list 1 From the service menu select Error history 2 Press CONFIRM Please see chapter 10 4 for error code diagnosis and actions To delete an Error history item 1 From E...

Page 25: ...ion screen 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 2 Press CONFIRM 3 You will be prompted to enter a password 4 Hold down buttons F3 and F4 together for 3 secs 5 You will be asked ...

Page 26: ... sensor A at time of error 0 255 0 1L min 542 Flow rate of the primary circuit Flow sensor B 0 255 0 1L min 579 Flow rate of the primary circuit Flow sensor B at time of error 0 255 0 1L min 533 Indoor unit Flow water temp THW3 39 110 C 534 Indoor unit DHW supply temp THW4 39 110 C 573 Indoor unit DHW supply temp THW4 at time of error 39 110 C 535 Indoor unit Stored water temp upper THW5A 39 110 C...

Page 27: ...0 39 0 1 0 1 1 1 0 0 00 3A 1 1 0 1 1 1 0 0 00 3B 0 0 1 1 1 1 0 0 00 3C 1 0 1 1 1 1 0 0 00 3D 0 1 1 1 1 1 0 0 00 3E 1 1 1 1 1 1 0 0 00 3F 0 OFF 1 ON SW1 SW2 SW3 SW4 SW5 Display 1 2 3 4 5 6 7 8 0 0 0 0 0 0 1 0 00 40 1 0 0 0 0 0 1 0 00 41 0 1 0 0 0 0 1 0 00 42 1 1 0 0 0 0 1 0 00 43 0 0 1 0 0 0 1 0 00 44 1 0 1 0 0 0 1 0 00 45 0 1 1 0 0 0 1 0 00 46 1 1 1 0 0 0 1 0 00 47 0 0 0 1 0 0 1 0 00 48 1 0 0 1 0 ...

Page 28: ...0 B9 0 1 0 1 1 1 0 1 00 BA 1 1 0 1 1 1 0 1 00 BB 0 0 1 1 1 1 0 1 00 BC 1 0 1 1 1 1 0 1 00 BD 0 1 1 1 1 1 0 1 00 BE 1 1 1 1 1 1 0 1 00 BF 0 OFF 1 ON SW1 SW2 SW3 SW4 SW5 Display 1 2 3 4 5 6 7 8 0 0 0 0 0 0 1 1 00 C0 1 0 0 0 0 0 1 1 00 C1 0 1 0 0 0 0 1 1 00 C2 1 1 0 0 0 0 1 1 00 C3 0 0 1 0 0 0 1 1 00 C4 1 0 1 0 0 0 1 1 00 C5 0 1 1 0 0 0 1 1 00 C6 1 1 1 0 0 0 1 1 00 C7 0 0 0 1 0 0 1 1 00 C8 1 0 0 1 0 ...

Page 29: ...1 1 0 0 xx 38 1 0 0 1 1 1 0 0 xx 39 0 1 0 1 1 1 0 0 xx 3A 1 1 0 1 1 1 0 0 xx 3B 0 0 1 1 1 1 0 0 xx 3C 1 0 1 1 1 1 0 0 xx 3D 0 1 1 1 1 1 0 0 xx 3E 1 1 1 1 1 1 0 0 xx 3F 0 OFF 1 ON OUT Display 1 3 4 6 0 0 0 0 0 0 1 0 xx 40 1 0 0 0 0 0 1 0 xx 41 0 1 0 0 0 0 1 0 xx 42 1 1 0 0 0 0 1 0 xx 43 0 0 1 0 0 0 1 0 xx 44 1 0 1 0 0 0 1 0 xx 45 0 1 1 0 0 0 1 0 xx 46 1 1 1 0 0 0 1 0 xx 47 0 0 0 1 0 0 1 0 xx 48 1 0...

Page 30: ...1 1 0 1 xx B8 1 0 0 1 1 1 0 1 xx B9 0 1 0 1 1 1 0 1 xx BA 1 1 0 1 1 1 0 1 xx BB 0 0 1 1 1 1 0 1 xx BC 1 0 1 1 1 1 0 1 xx BD 0 1 1 1 1 1 0 1 xx BE 1 1 1 1 1 1 0 1 xx BF 0 OFF 1 ON OUT Display 1 3 4 6 0 0 0 0 0 0 1 1 xx C0 1 0 0 0 0 0 1 1 xx C1 0 1 0 0 0 0 1 1 xx C2 1 1 0 0 0 0 1 1 xx C3 0 0 1 0 0 0 1 1 xx C4 1 0 1 0 0 0 1 1 xx C5 0 1 1 0 0 0 1 1 xx C6 1 1 1 0 0 0 1 1 xx C7 0 0 0 1 0 0 1 1 xx C8 1 0...

Page 31: ...1 1 0 0 39 xx 0 1 0 1 1 1 0 0 3A xx 1 1 0 1 1 1 0 0 3B xx 0 0 1 1 1 1 0 0 3C xx 1 0 1 1 1 1 0 0 3D xx 0 1 1 1 1 1 0 0 3E xx 1 1 1 1 1 1 0 0 3F xx Displayed only when the request code is 553 0 OFF 1 ON OUT Display 13 A B 0 0 0 0 0 0 1 0 40 xx 1 0 0 0 0 0 1 0 41 xx 0 1 0 0 0 0 1 0 42 xx 1 1 0 0 0 0 1 0 43 xx 0 0 1 0 0 0 1 0 44 xx 1 0 1 0 0 0 1 0 45 xx 0 1 1 0 0 0 1 0 46 xx 1 1 1 0 0 0 1 0 47 xx 0 0 ...

Page 32: ... 0 0 1 1 1 0 1 B8 xx 1 0 0 1 1 1 0 1 B9 xx 0 1 0 1 1 1 0 1 BA xx 1 1 0 1 1 1 0 1 BB xx 0 0 1 1 1 1 0 1 BC xx 1 0 1 1 1 1 0 1 BD xx 0 1 1 1 1 1 0 1 BE xx 1 1 1 1 1 1 0 1 BF xx 0 OFF 1 ON OUT Display 0 0 0 0 0 0 1 1 C0 xx 1 0 0 0 0 0 1 1 C1 xx 0 1 0 0 0 0 1 1 C2 xx 1 1 0 0 0 0 1 1 C3 xx 0 0 1 0 0 0 1 1 C4 xx 1 0 1 0 0 0 1 1 C5 xx 0 1 1 0 0 0 1 1 C6 xx 1 1 1 0 0 0 1 1 C7 xx 0 0 0 1 0 0 1 1 C8 xx 1 0 ...

Page 33: ...3D 0 1 1 1 1 1 0 0 00 3E 1 1 1 1 1 1 0 0 00 3F 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 IN Display 1 6 8 0 0 0 0 0 0 1 0 00 40 1 0 0 0 0 0 1 0 00 41 0 1 0 0 0 0 1 0 00 42 1 1 0 0 0 0 1 0 00 43 0 0 1 0 0 0 1 0 00 44 1 0 1 0 0 0 1 0 00 45 0 1 1 0 0 0 1 0 00 46 1 1 1 0 0 0 1 0 00 47 0 0 0 1 0 0 1 0 00...

Page 34: ... 0 1 00 BD 0 1 1 1 1 1 0 1 00 BE 1 1 1 1 1 1 0 1 00 BF Display 0 0 0 0 0 0 1 1 00 C0 1 0 0 0 0 0 1 1 00 C1 0 1 0 0 0 0 1 1 00 C2 1 1 0 0 0 0 1 1 00 C3 0 0 1 0 0 0 1 1 00 C4 1 0 1 0 0 0 1 1 00 C5 0 1 1 0 0 0 1 1 00 C6 1 1 1 0 0 0 1 1 00 C7 0 0 0 1 0 0 1 1 00 C8 1 0 0 1 0 0 1 1 00 C9 0 1 0 1 0 0 1 1 00 CA 1 1 0 1 0 0 1 1 00 CB 0 0 1 1 0 0 1 1 00 CC 1 0 1 1 0 0 1 1 00 CD 0 1 1 1 0 0 1 1 00 CE 1 1 1 1...

Page 35: ...tion an operation without connecting outdoor unit and main remote controller is possible When in Emergency operation the main control has NO control functions Heater Heating for DHW and space heating is provided by the booster heater Activating emergency operation mode To activate emergency operation see the following 1 Switch OFF the breaker for the indoor unit 2 Change DIP switch SW4 5 to ON 3 S...

Page 36: ...acing parts 10 2 Test Run Before a test run After installation of outdoor unit pipework and electrical wiring recheck that there is no water leakage loosened connections or miswiring Measure impedance between the ground and the power supply terminal block L N on the outdoor and indoor units with suitable 500V ohmmeter Resistance VKRXOG EH 0ȍ Read the Installation and Operation Manuals fully especi...

Page 37: ...s CNBH to GHWHUPLQH IDXOW 6HH IRU KRZ WR FKHFN 6 3RZHU VXSSO YROWDJH LQFUHDVH 6 KHFN WKH VXSSO YROWDJH 7 THW1 or THW2 has become de tached from its holder 7 VisXDOOy inspect location and reattach as necessary THW1 or THW2 or THW3 IDXOW Check resistance of thermistor against ta EOH LQ VHFWLRQ Compare FTC detected temperatXUH to hand held detector 7 ERDUG IDLOXUH Replace board L4 Tank water temperat...

Page 38: ... of the following Faulty pump insufficient air purge blocked strainer leak in water circuit Error code Thermistor Open detection Short detection Symbol Name P1 TH1A TH1B Room temperature thermisitor RU EHORZ RU DERYH L5 THW1 Flow water temperature thermisitor RU EHORZ RU DERYH THW2 Return water temperture thermisitor RU EHORZ RU DERYH THW3 Flow water temp thermisitor to tank RU EHORZ RU DERYH THW4...

Page 39: ...e following Faulty pump insufficient air purge blocked strainer leak in water circuit 1 Check circulation pump See 10 6 for how to check Open air vent to remove trapped air Check the strainer for blockages Check the primary water circuit for leaks Check that the flow amount is within the recommended range during heating operation Refer to Procedure 5 in 11 DISASSEMBLY PROCEDURE 2 Check valves on p...

Page 40: ...o both the indoor unit and outdoor unit should be switched OFF then ON If the E3 E5 code is still displayed the FTC and or the main remote controller circuit board should be replaced 3 Fault with the main remote controller circuit board 4 Electrical noise causes interference with transmission reception of data for main remote controller controller can not find an empty transmission path Error code...

Page 41: ...as the error E g Error code J3 refers to a communication fault between the wireless receiver and wireless remote control with address 3 1 Battery on wireless remote controller 1 Check and replace the battery if necessary the wireless remote controller battery 2 The wireless remote controller is out of range of the wireless receiver 2 to 4 Reposition the wireless remote controller closer to the rec...

Page 42: ...rd and the FTC control board Ensure S3 is securely wired with no damage See 7 FIELD WIRING 5HSODFH WKH RXWGRRU XQLW V DQG RU WKH 7 V FRQWURO ERDUGV 3 Communication failure between FTC and outdoor unit 3 The main screen appears with a press RI WKH 21 EXWWRQ EXW disappears in a second The main remote controller operations do not work for a while after the settings are changed in the service menu Thi...

Page 43: ... the side of booster heater covered with black rub 5 The earth leakage circuit breaker for booster heater breaker ECB1 tripped 5 Check the cause and reset if safe 6 The booster heater thermal cut out has tripped and cannot be reset using the manual reset button 6 Check resistance across the thermal cut out if open then the connection is broken and the booster heater will have to be replaced Contac...

Page 44: ...button if safe Reset button is located on the side of booster heater covered with black rub ber cap See 4 PART NAMES AND FUNCTIONS for position 5 Booster heater breaker ECB1 tripped 5 Check the cause of the trip and reset if safe 6 The booster heater thermal cut out tripped and can not be reset using the manual reset button 6 Check resistance across the thermal cut out if open then the connection ...

Page 45: ... new one 18 Noisy water circulation pump Air in water circulation pump Use manual and automatic air vents to remove air from system Top up water if necessary to achieve 1 bar on primary circuit Use manual and automatic air vents to remove air from system Top up water if necessary to achieve 1 bar on primary circuit 19 Noise during hot water draw off typically worse in the 1 Loose airing cupboard p...

Page 46: ... the one set at the main remote controller by referring to Energy monitor setting in section 9 4 2 Non connectable type of external meter local supply is connected 2 Check if the external meter local supply is connectable type by referring to Energy monitor setting in section 9 4 3 External meter local supply failure 3 Check if signal is sent to IN8 to IN10 properly Refer to section 6 WIRING DIAGR...

Page 47: ...dback signal Signal ref BLUE BROWN GREEN YELLOW BLUE BLACK M 1 N Water circulation pump primary circuit characteristics Recommended water flow rate range Pump speed Speed 1 Speed 2 Speed 3 Speed 4㸦Default seƟng㸧 Speed 5 0 0 20 0 40 0 60 0 80 0 100 0 120 0 140 0 160 0 10 8 6 4 2 0 ǆƚĞƌŶĂů ƐƚĂƟĐ ƉƌĞƐƐƵƌĞ ŬWĂ ůŽǁ ƌĂƚĞ ŵŝŶ Outdoor unit QUHZ W40VA 3 0 8 0 Water flow rate range L min ...

Page 48: ...bnormal 1 2 ȍ Open or Short Earth leakage circuit breaker for heater Yellow White Green Brown Flow signal part name symbol Flow sensor 1 CN1A Flow sensor A CN2A Flow sensor B CN2B V 5V DC CN1A 1 4 Flow signal 4 0 3 5 3 0 2 5 2 0 1 5 1 0 0 5 0 0 0 4 8 12 16 20 0 8 16 24 32 40 Flow l min Flow output signal V 0 35V Flow signal 4 0 3 5 3 0 2 5 2 0 1 5 1 0 0 5 0 0 Flow l min Flow output signal V 0 35V ...

Page 49: ... At ambient temperatures of 10 30 C Thermistor Characteristics Charts 0 C Nȍ 10 C Nȍ 20 C Nȍ 25 C Nȍ 30 C Nȍ 40 C Nȍ Thermistor R0 15kȍ 3 B constant 3480 2 Rt 15exp 3480 273 t 273 1 1 erly the motor may not fit onto the valve securely so remove the motor by 5RRP WHPSHUDWXUH WKHUPLVWRU 7 0 C Nȍ 10 C Nȍ 20 C Nȍ 30 C Nȍ 40 C Nȍ 50 C Nȍ 60 C Nȍ 70 C Nȍ 80 C Nȍ 0 C Nȍ 10 C Nȍ 20 C Nȍ 30 C Nȍ 40 C Nȍ 50...

Page 50: ...0 TBI 1 9 10 Heat meter CN22 RC TBI 1 13 14 Main remote controller 10 4 13 7V DC CN2A Flow sensorA input CNW12 Thermistor 1 2 Flow water temp 3 4 Return water temp CN2B Flow sensorB input CNW5 Thermistor 2 3 Stored water upper temp 4 5 Stored water lower temp CNRF Transmission Indoor Wireless receiver 1 2 11 5 13 2V DC LED3 Transmission Indoor Outdoor LED2 Power supply Main remote controller CNPWM...

Page 51: ...ide the main controller support upwards and remove the support together with the main controller from the front panel 2 Pull out the bottom of the front panel CAUTION During regular use the cylinder unit is connected to the main controller by a lead wire So the lead wire might be disconnected or broken if the front panel is removed with great force CAUTION Take care to prevent the main controller ...

Page 52: ...or coded by cable straps at board connections When installing the board check the color of the cable straps to ensure that lead wires are connected correctly CAUTION 2 Lead wires are color coded by cable straps at their connections When connecting lead wires check the color of the cable straps to ensure that lead wires are connected correctly 1 Disconnect all lead wires connected to electrical par...

Page 53: ...thermistor THW1 is removed Thermistor THW1 Connector RED of thermistor THW1 THW2 Connector RED Thermistor THW3 THW4 CNW12 connector RED CNW3 connector BLUE CNW5 connector WHITE 1 Remove the front panel The thermistor THW1 and the thermistor THW2 are assembled as shown in this Figure 2 Remove the copper clamps of the thermistor THW1 THW2 from the pipes Photo 5 2 3 Disconnect the connector RED of th...

Page 54: ... the controller board Photo 5 5 CAUTION 1 To remove the thermistor THW3 remove the two screws securing the controller box Pull the controller box forward about 30 degrees then it makes easy to remove the copper clamp of the thermistor THW3 Below photos CAUTION 2 Take care NOT to pull the lead wire strongly when removing the thermistor CAUTION 3 When placing a new thermistor place it in the origina...

Page 55: ...ets of insulation around the tank Photo 5 7 Photo 5 8 and Photo 5 9 CAUTION 1 Take care NOT to break the plastic bag covering the insulation when removing the tapes securing the insulation If the plastic bag is broken repair with tape or other materials Removal of the front right left and rear panels Tape Tape First layer of insulation outside First layer of insulation outside First layer of insul...

Page 56: ... the front and back sides of thermistor when placing it Place it correctly in the same state as when removing it Photo 5 12 CAUTION 4 Place two sheets of insulation in the original position When placing two sheets of insulation be sure to secure them with tape in the same state as before their removal From the previous page Thermistor THW5A Red wire Thermistor THW5A Red wire Thermistor THW5B Blue ...

Page 57: ...igure 4 6 2 How to remove the Rear panel 1 Remove the 3 screws of the top panel Figure 4 2 Remove the 3 screws of the base plate Figure 4 3 Remove the 2 screws of the stay pipe of the upper side panel Figure 3 and 4 5 Remove the 3 screws of the base plate Figure 3 Remove the 3 screws of the base plate Figure 4 4 Remove the 4 screws of the fixing plate Figure 3 top panel rear panel side panel 2 scr...

Page 58: ...clamps the cable strap in the control box and the bands below the controller box Photo 7 3 and 7 4 4 Open the pressure relief valve cap and lower the tank internal pressure Photo 7 5 5 When removing the pump valve open the drain valve to drain all water Photo 7 6 earth cable CNP1 connector CNPWM connector cable clamps cable clamps controller box cable clamps screw Recoat the removed earth cable wi...

Page 59: ... pump1 by removing the two G1 1 2 nuts using the two spanners one to hold the G1 1 2 nut and the other to turn the other side of G1 1 2 nut Remove the water pump by sliding it horizontally Photo 7 7 and Figure 5 KHQ UHLQVWDOOLQJ WKH QXWV XVH QHZ gaskets 6HW WKH ZDWHU SXPS LQ WKH ZD WKDW WKH VWDPSHG flowarrow pointing up 6 Close OFF the pump valve Photo 7 7 KHQ WKH SXPS YDOYH KDQGOH LV VWLII XVH D ...

Page 60: ...3 connector in the control box Photo 8 1 and 8 2 3 Release the water pump lead wire from the cable clamps and the bands below the control box Photos 8 3 and 8 4 CNPWM3 connector 4 Open the pressure relief valve cap and lower the tank internal pressure Photo 8 5 pressure relief valve caps cable clamps cable clamps cable clamps controller box earth cable CNPA connector screw Recoat the removed earth...

Page 61: ...of the water pump A top and bottom and drain away water in the water pump A Photo 8 6 8 Remove the water pump A primary circuit by UHPRYLQJ WKH WZR QXWV XVLQJ WKH VSDQQHUV RQH WR KROG WKH QXW DQG WKH RWKHU WR WXUQ WKH other side of G1 1 2 nut KHQ UHLQVWDOOLQJ WKH QXWV XVH D QHZ gaskets 6HW WKH ZDWHU SXPS LQ WKH ZD WKDW WKH VWDPSHG IORZ arrow pointing up I LW LV GLIILFXOW WR UHPRYH ZDWHU SXPS UHPRY...

Page 62: ...r this SURFHGXUH 5 Remove the 2 screws only near side on the 2 strainer valve stay Photo 9 4 and 9 6 LW LV GLIILFXOW WR UHPRYH WKH VFUHZV RQ WKH strainer valve stay remove the 4 screws on the strainer valve stay slide the strainer valve stay Photo 9 5 5HXVH WKH UHPRYHG VWUDLQHU YDOYH VWD DQG WKH VWUDLQHU YDOYH VWD IL LQJ VFUHZV band strainer valve 2 strainer valve stays and 2 screws pressure relie...

Page 63: ...lier and VORZO WR GUDLQ WKH ZDWHU LQ WKH VWUDLQHU IURP WKH drain valve 5HPRYH WKH FRYHU XVLQJ WZR VSDQQHUV RQH WR KROG the strainer valve and the other to turn the cover Photo 9 7 H VXUH WR UHDWWDFK WKH PHVK DIWHU ZDVKLQJ LW KHQ UHLQVWDOOLQJ WKH FRYHU XVH D QHZ SDFNLQJ cover strainer valve strainer valve From the previous page 1RWH KHQ RQO FOHDQLQJ WKH VWUDLQHU YDOYH VNLS VWHSV DQG 1RWH ORVH WZR Y...

Page 64: ...the CNV1 connector on the controller board Photo 10 1 and 10 2 3 Release the 3 way valve motor lead wire from the cable clamps the quick connection and the cable strap in the controller box and the cable band below the controller box Photos 10 3 and 10 4 Remove the 2 screws on the left side of the control box and open it cable band Attach it by all means if remove a cable band controller box CNV1 ...

Page 65: ... ZKHQ UHLQVWDOOLQJ WKH ZD valve motor 5 Open the pressure relief valve cap and lower the tank internal pressure Photo 10 6 pressure relief valve cap 3 way valve motor the button 6 Close OFF the pump valve and strainer valve Photo 10 7 and 10 8 When the pump valve strainer valve handle is stiff use a tool to grip the handle and turn it carefully When opening or closing the pump valve strainer valve...

Page 66: ...QVWDOOLQJ WKH ZD YDOYH FKHFN DJDLQ WKDW WKH TXLFN FRQQHFWLRQ DUH LQVWDOOHG KHQ UHSODFLQJ WKH ZD YDOYH WDNH FDUH QRW WR become injured by touching the left side edge of the controller box From the previous page 7 QVWDOO WKH GUDLQ FRFN KRVH DW WKH GUDLQ FRFN RI the booster heater inlet lower right and drain water photo 10 9 8 5HPRYH WKH TXLFN FRQQHFWLRQ RI WKH QXWV bottom left and right connected to...

Page 67: ...and the pressure relief valve 2 Open the pressure relief valve cap and lower the tank internal pressure Photo 11 1 pressure relief valve cap quick connection nipple pressure relief valve Pressure air vent pressure air vent pressure air vent Turn it with the spanner and take it off A 1 Remove the front panel 3 Using two spanners remove the screw and the pressure air vent Photo 11 4 11 5 11 6 2 Open...

Page 68: ...in water Photo 11 9 2 Open the pressure relief valve cap and lower the tank internal pressure Photo 11 3 3 Close OFF the pump valve and strainer valve Photo 11 7 and 11 8 When the pump valve strainer valve handle is stiff use a tool to grip the handle and turn it carefully When opening or closing the pump valve strainer valve ensure to do so fully not halfway pump valve pump valve strainer valve s...

Page 69: ...manometer remove the quick connection at the rear of the manometer and remove the manometer together with the fixing support Photo 11 10 and 11 11 6 Remove the two screws securing the manometer and then remove the manometer and nipple Photo 11 12 and 11 13 From the previous page screw screw screw screw screw nipple quick connection manometer manometer manometer fixing support ...

Page 70: ...e the front panel 2 Disconnect the CN1A connector in the controller box Photo 12 2 and 12 3 3 Release the flow sensor lead wire from the cable clamps and the bands below the control box Photos 12 2 and 12 4 cable clamps CN1A connector 4 Open the pressure relief valve caps and lower the tank internal pressure Photo 12 5 pressure relief valve caps cable band Flow sensor 1 Flow sensor B Flow sensor A...

Page 71: ...ck hose at the drain cock of the booster heater inlet lower right and drain water Photo 12 8 Flow sensor 1 5 Close OFF the pump valve and strainer valve Photo 12 6 and 12 7 When the pump valve strainer valve handle is stiff use a tool to grip the handle and turn it carefully When opening or closing the pump valve strainer valve ensure to do so fully not halfway drain cock pump valve pump valve str...

Page 72: ...onnector cable bands cable band drain cock the primary side hex drain cock the sanitary side 4 Open the pressure relief valve caps and lower the tank internal pressure Photo 13 3 5 Open the drain cock Primary side below the HEX to drain water inside Photo 13 4 6 Remove the flow sensor B Photo 13 5 Draw out the quick connection to the front side and remove Be sure to set the flow sensor B so that t...

Page 73: ...ds below the controller box Photos 13 2 and 14 1 4 Stop water flow at the water source 5 Open the drain cock Sanitary side below the HEX to drain water inside Photo 13 3 6 Remove the flow sensor A Photo 12 1 and 14 2 Draw out the quick connection to the front side and remove Be sure to set the flow sensor A so that the direction of flow arrow is facing downwards When replacing the flow sensor A be...

Page 74: ...in cock Sanitary circuit Photo 13 4 5 Detach 4 quick connections Photo 15 1 6 Remove the 2 screws to remove the cover Photo 15 2 and 15 3 5HXVH WKH FRYHU DQG WKH VFUHZV 7 Remove the HEX and drain cock Sanitary circuit KHQ UHLQVWDOOLQJ WKH GUDLQ FRFN VDQLWDU FLUFXLW and O ring use a new one From the previous page 3 Open the pressure relief valve cap and lower the tank internal pressure Photo 12 5 s...

Page 75: ...or on the controller board and the booster heater lead wires wired to the BHC2 contactor respectively and release the lead wires from the quick connection the cable clamp the cable strap the coated clamp and the band Photo 16 1 16 2 16 3 16 4 and 16 5 3 Open the pressure relief valve cap and lower the tank internal pressure Photo 16 6 CNBHT connector cable clamps cable clamps cable clamp cable cla...

Page 76: ...he booster heater inlet lower right and drain water Photo 16 9 4 Close OFF the pump valve and strainer valve Photo 16 7 and 16 8 When the pump valve strainer valve handle is stiff use a tool to grip the handle and turn it carefully When opening or closing the pump valve strainer valve ensure to do so fully not halfway quick connection booster heater booster heater quick connection pump valve pump ...

Page 77: ... with the heater stay from the front frame L Photo 16 12 7 Remove all screws attached to the fixing plate and then remove the fixing plate Photo 16 12 9 Remove the 2 screws B and remove the heater stay from the booster heater Photo 16 12 Also replace the insulation washers that are provided on the screw of the heater stays Also replace the insulation sheets that are provided on surface of the boos...

Page 78: ...ing torques in accordance with Table 11 1 Always use a new O ring or gasket Table 11 1 Size inch Recommended tightening torque Nm Gasket 30 2 42 2 11 2 17 2 18 3 G1 1 2 G1 G1 2 G1 4 O ring Air vent Automatic Drain cock Air vent manual 0 25 0 05 0 25 0 05 After the procedure is complete ensure that no water leaks ...

Page 79: ...r ambient temp Zone1 outdoor ambient temp DHW Zone1 heating flow temp Heating Zone1 heating room temp Zone2 heating room temp 5 C F Summer time Temp display Time display Room sensor settings for Zone1 Room sensor settings for Zone2 1 Room RC zone select 1 Thermistor adjustment Auxiliary settings THW1 THW2 THW3 THW4 THW5A THW5B Economy settings for pump 10 C 30 C 10 C 30 C 25 C 60 C í Active Non ac...

Page 80: ...ck condition of cables 2 Controller Frequency Notes 1 2 Check operation of motorized valves ensure they reseat correctly 3 Check battery power of wireless thermostat and replace if necessary Outdoor heat pump unit maintenance record sheet Model number Serial number Mechanical Frequency Notes 1 Inspect grill and air inlet for trapped debris damage 2 Check condensate drain provision 3 Check integrit...

Page 81: ...YO 100 8310 JAPAN Copyright 2015 MITSUBISHI ELECTRIC CORPORATION New publication effective Dec 2015 Specifications are subject to change without notice Distributed in Dec 2015 No GCH15010 Distributed in Jul 2021 No GCH15010 REVISED EDITION A Made in Japan ...

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Mitsubishi Electric ecodan EHPT20Q-VM2EA, Service Manual

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