Mitsubishi Electric ecodan EHPX-VM2D Service Manual Download Page 1 | Manualshive

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SERVICE MANUAL

CONTENTS

1. REFERENCE MANUAL ................................... 3
2. SAFETY PRECAUTION ................................... 4
3. SPECIFICATIONS ............................................ 6
4. PART NAMES AND FUNCTIONS .................. 8
5. OUTLINES AND DIMENSIONS ....................... 9
6. WIRING DIAGRAM .........................................11
7. FIELD WIRING ............................................... 17
8. WATER SYSTEM DIAGRAM ......................... 19
9. CONTROLS ................................................... 22
10. TROUBLESHOOTING ................................... 43
11. DISASSEMBLY PROCEDURE ...................... 60
12. SUPPLEMENTARY INFORMATION ............. 80
13. SERVICE AND MAINTENANCE ................... 81

Note:

• This manual describes

service data of

Hydrobox only.

MAIN REMOTE

CONTROLLER

PARTS CATALOG (OCB712)

HYDROBOX

October 2020

HYDROBOX

No. OCH712

REVISED EDITION-C

[Model Name]

EHSD-MED

EHSD-VM2D

EHSD-VM6D

EHSD-YM9D

EHSD-YM9ED

EHSD-TM9D

ERSD-MED

ERSD-VM2D

ERSD-VM6D

ERSD-YM9D

[Service Ref.]

Refer to page 2.

EHSC-MED

EHSC-VM2D

EHSC-VM6D

EHSC-YM9D

EHSC-YM9ED

EHSC-TM9D

ERSC-MED

ERSC-VM2D

ERSC-VM6D

ERSC-YM9D

Revision:

• ERSD-VM6D, ERSD-

YM9D, ERSC-VM6D,

ERSC-YM9D and

ERPX series have been

added.

• Some descriptions

have been modified in

REVISED EDITION-C.

OCH712B is void.

EHSE-MED

EHSE-YM9ED

ERSE-MED

ERSE-YM9ED

EHPX-VM2D

EHPX-VM6D

EHPX-YM9D

EHPX-MED

EHPX-YM9ED

ERPX-MD

ERPX-VM2D

ERPX-VM6D

ERPX-YM9D

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2
3
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Summary of Contents for ecodan EHPX-VM2D

Page 1: ...TROLLER PARTS CATALOG OCB712 HYDROBOX October 2020 HYDROBOX No OCH712 REVISED EDITION C Model Name EHSD MED EHSD VM2D EHSD VM6D EHSD YM9D EHSD YM9ED EHSD TM9D ERSD MED ERSD VM2D ERSD VM6D ERSD YM9D Service Ref Refer to page 2 EHSC MED EHSC VM2D EHSC VM6D EHSC YM9D EHSC YM9ED EHSC TM9D ERSC MED ERSC VM2D ERSC VM6D ERSC YM9D Revision ERSD VM6D ERSD YM9D ERSC VM6D ERSC YM9D and ERPX series have been ...

Page 2: ...VM6D UK ERSD YM9D UK EHSC MED UK EHSC VM2D UK EHSC VM6D UK EHSC YM9D UK EHSC YM9ED UK EHSC TM9D UK ERSC MED UK ERSC VM2D UK ERSC VM6D UK ERSC YM9D UK EHSE MED UK EHSE YM9ED UK ERSE MED UK ERSE YM9ED UK EHPX VM2D UK EHPX VM6D UK EHPX YM9D UK EHPX MED UK EHPX YM9ED UK ERPX MD UK ERPX VM2D UK ERPX VM6D UK ERPX YM9D UK OCH712C ...

Page 3: ...K PUHZ SW100YAA BS UK OCH651 OCB651 PUMY P112VKM4R4 BS UK PUMY P125VKM4R4 BS UK PUMY P140VKM4R4 BS UK PUMY P112YKM4R4 BS UK PUMY P125YKM4R4 BS UK PUMY P140YKM4R4 BS UK PUMY P112YKME4R4 BS UK PUMY P125YKME4R4 BS UK PUMY P140YKME4R4 BS UK OCH673 OCB673 PUD SWM60VAA BS UK PUD SWM80VAA BS UK PUD SWM80YAA BS UK PUD SWM100VAA BS UK PUD SWM100YAA BS UK PUD SWM120VAA BS UK PUD SWM120YAA BS UK PUD SHWM60VA...

Page 4: ...t in an explosion and other hazards The use of any refrigerant other than that specified for the system will cause mechanical failure or system malfunction or unit breakdown In the worst case this could lead to a serious impediment to securing product safety In heating mode to avoid the heat emitters being damaged by excessively hot water set the target flow temperature to a minimum of 2ºC below t...

Page 5: ...by the man ufacturer In order to prevent condensation on emitters adjust flow temperature appropriately and also set the lower limit of the flow temperature on site As for the handling of refrigerant refer to the outdoor unit installation manual 1 Cautions for service 1 Perform service after recovering the refrigerant left in unit completely 2 Do not release refrigerant in the air 3 After completi...

Page 6: ...ons Water primary circuit 28 mm Compression G1 B 28 mm Compression G1 B Refrigerant R32 R410A Liquid Ø6 35 mm Ø9 52 mm Gas Ø12 7 mm Ø15 88 mm Target temperature range Flow temperature Heating 20 60 C Cooling 5 25 C 5 25 C Room temperature Heating 10 30 C Cooling Guaranteed operating range Ambient 2 0 35 C 80 RH Outdoor temperature Heating See outdoor unit spec table Cooling 3 3 Electrical data Con...

Page 7: ...G1 1 2 B 28 mm Compression G1 B Refrigerant R32 R410A Liquid Ø9 52 mm Gas Ø25 4 mm Brazing Target temperature range Flow temperature Heating 20 60 C Cooling 5 25 C Room temperature Heating 10 30 C Cooling Guaranteed operating range Ambient 2 0 35 C 80 RH Outdoor temperature Heating See outdoor unit spec table Cooling 3 3 Electrical data Control board Including 3 pumps Power supply Phase voltage fr...

Page 8: ...tomatic air vent 13 Expansion vessel 1 2 14 Strainer valve 15 Drain pan 16 Pressure relief valve 5 bar 1 2 17 Pressure sensor 3 3 3 3 3 Table 4 1 E S M D Split model system 7 11 9 8 14 12 3 4 5 16 13 E SE M ED Split model system 15 14 3 5 15 7 9 8 12 11 4 17 Note For installation of all E M ED models make sure to install a suitably sized primary side expansion vessel See figure 8 1 and 8 2 for fur...

Page 9: ...ection FROM heat pump 28 mm Compression EHPX G1 nut ERPX F Return connection TO heat pump 28 mm Compression EHPX G1 nut ERPX G Discharge pipe by installer from pressure relief valve G1 2 female valve port within hydrobox casing H Electrical cable inlets For inlets and run high voltage wires including power cable indoor outdoor cable and external output wires For inlets and run low voltage wires in...

Page 10: ...00 100 5 G1 2 110 242 C D A B I H G 187 249 300 367 492 541 110 124 193 242 48 86 124 163 263 291 357 348 AUTO AIR VENT FRONT PANEL EARTH LEAKAGE BREAKER TERMINAL BED MAIN CONTROLLER MANOMETER PRESSURE RELIEF VALVE BACK PANEL SUPPORT HOOK Front Side Rear REFRIGERANT LIQUID 3 8 REFRIGERANT GAS REFER TO DETAIL VIEW A SPACE HEATING FLOW ISO 228 1 G1 1 2 B SPACE HEATING RETURN ISO 228 1 G1 1 2 B DEATI...

Page 11: ...s and related parts may be reduced 3 To turn on the boiler operation use the main remote controller to select Boiler in External input setting screen in the service menu Table 2 Outputs Name Terminal block Connector Item OFF ON OUT1 TBO 1 1 2 CNP1 Water circulation pump 1 output Space heating cooling DHW OFF ON OUT2 TBO 1 3 4 Water circulation pump 2 output Space heating cooling for Zone1 OFF ON O...

Page 12: ...SD card connector Table 2 Outputs Name Terminal block Connector Item OFF ON OUT1 TBO 1 1 2 CNP1 Water circulation pump 1 output Space heating cooling DHW OFF ON OUT2 TBO 1 3 4 Water circulation pump 2 output Space heating cooling for Zone1 OFF ON OUT3 TBO 1 5 6 Water circulation pump 3 output Space heating cooling for Zone2 1 OFF ON 2 way valve 2b output 2 OUT4 TBO 2 4 6 CNV1 3 way valve 2 way val...

Page 13: ...e service menu Table 2 Outputs Name Terminal block Connector Item OFF ON OUT1 TBO 1 1 2 CNP1 Water circulation pump 1 output Space heating cooling DHW OFF ON OUT2 TBO 1 3 4 Water circulation pump 2 output Space heating cooling for Zone1 OFF ON OUT3 TBO 1 5 6 Water circulation pump 3 output Space heating cooling for Zone2 1 OFF ON 2 way valve 2b output 2 OUT4 TBO 2 4 6 CNV1 3 way valve 2 way valve ...

Page 14: ...p speed control signal for MP1 CN108 SD card connector 1 2 CN22 BU CN108 1 3 CN3C BU 1 3 CNPWM WH 1 8 CN851 BK 1 5 CNRF WH Wireless receiver Option 1 5 CN105 RD WiFi adapter Option 1 5 CNIT BU 1 2 CN20 RD 1 3 CN21 YE 1 4 CNW12 RD CNW5 BU 1 4 CN1A WH TBI 1 LED1 LED2 LED3 LED4 TAB1 1 8 1 8 1 8 1 8 1 6 SW1 SW2 SW3 SW4 SW5 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 3 1 7 1 3 1 3 CNBC GY...

Page 15: ...NW5 BU 1 4 CN1A WH TBI 1 TAB1 1 8 1 8 1 8 1 8 1 6 SW1 SW2 SW3 SW4 SW5 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 3 1 7 1 3 1 3 CNBC GY CNBH WH CNBHT BK CNIH OG CNV1 WH CNP4 RD CNP1 WH TBO 1 TBO 2 TBO 3 TBO 4 1 3 5 1 3 CNP4 RD F1 F2 CN01 BK TBO 1 X1 X2 X3 X14 1 3 3 CNPWM WH CNP1 WH 1 3 M 1 2WV2b MP3 MP4 1 2 3 4 5 6 TBO 2 1 3 5 3WV 1 2 3 4 5 6 7 8 TBO 3 X4 X10 X16 X11 X12 TBO 4 1 2 3 ...

Page 16: ...Failure detection at open OFF SW3 3 OFF SW3 4 Electric energy meter WITHOUT Electric energy meter WITH Electric energy meter OFF SW3 5 Heating mode function 4 Inactive Active ON SW3 6 2 zone valve ON OFF control Inactive Active OFF SW3 7 Heat exchanger for DHW Coil in tank External plate HEX OFF SW3 8 Heat meter WITHOUT Heat meter WITH Heat meter OFF SW4 SW4 1 Multiple outdoor units control Inacti...

Page 17: ... 6 0 mm Wiring No size mm Hydrobox Outdoor unit 3 3 1 5 polar Hydrobox Outdoor unit earth 3 1 Min 1 5 Circuit rating Hydrobox Outdoor unit S1 S2 4 230 VAC Hydrobox Outdoor unit S2 S3 4 24 VDC 1 If the installed earth leakage circuit breaker does not have an over current protection function install a breaker with that function along the same power line 2 A breaker with at least 3 0 mm contact separ...

Page 18: ...l not be lighter than polychloroprene sheathed flexible cord Design 60227 IEC 53 3 Install an earth line longer than power cables 4 Please keep enough output capacity of power supply for each heater Insufficient power supply capacity might cause chattering Option2 Hydrobox powered by independent source 1 phase Figure 7 3 Electrical connections 1 phase 3 phase Figure 7 4 Electrical connections 3 ph...

Page 19: ... 1 2 9 Flow sensor 10 Manometer 11 Pressure relief valve 3 bar 12 Automatic air vent 13 Expansion vessel 3 4 14 Strainer valve 15 Drain pan 16 Pressure relief valve 5 bar 3 4 17 THW1 18 THW2 19 TH2 20 Pressure sensor 5 5 5 5 5 21 THW5B Optional part PAC TH011TK2 E or PAC TH011TKL2 E 22 Outdoor unit 23 Drain pipe Local supply 24 3 way valve Local supply 25 DHW indirect unvented tank Local supply 26...

Page 20: ...mp thermistor THW7 5 Zone1 water circulation pump local supply 6 Motorized mixing valve local supply 7 Zone2 flow water temp thermistor THW8 8 Zone2 return water temp thermistor THW9 9 Zone2 water circulation pump local supply Optional part PAC TH011 E Optional part PAC TH011 E 10 Zone2 heat emitters e g underfloor heating local supply 11 Boiler flow water temp thermistor THWB1 12 Mixing tank ther...

Page 21: ...prevent a corrosive reaction taking place which will damage the pipework 6 Check for leakages If leakages are found retighten the screws on the connections 7 Pressurise system to 1 bar 8 Release all trapped air using air vents during and following heating period 9 Top up with water as necessary If pressure falls below 1 bar 10 After removing the air automatic air vent MUST be closed Filling the Sy...

Page 22: ...scription 1 Legionella prevention When this icon is displayed Legionella prevention mode is active 2 Heat pump Heat pump is running Defrosting Emergency heating Quiet mode is activated 3 Electric heater When this icon is displayed the Electric heaters booster or immersion heater are in use 4 Target temperature Target flow temperature Target room temperature Compensation curve 5 OPTION Pressing the...

Page 23: ...ns The highlighted icon will appear as a larger version of the centre of the screen Press CONFIRM to select and edit the highlighted mode Follow the Main remote controller Menu Tree for further setting using buttons for scrolling or F1 to F4 for selecting 9 3 Main Settings Menu The main settings menu can be accessed by pressing the MENU button To re duce the risk of untrained end users altering th...

Page 24: ... Room RC1 8 Time Zone Time setting Time setting Sensor setting Sensor setting Language Summer time Temp display Contact number Time display C F Room sensor settings Heating Cooling Active Non active Active Non active Long press F1 F2 Zone1 2 select F1 F2 Zone1 2 select Continued to next page F1 Zone1 2 select Cooling flow temp Cooling flow temp Menu DHW recharge OCH712C F4 Schedule timer preview F...

Page 25: ... Energy price CO2 emission Heat source Schedule Electricity Electric Heat pump capacity ON OFF Boiler Boiler Boiler efficiency Target temp Start Finish Temp increase step Temp decrease step Max temp Max temp period Increase interval Decrease interval Booster heater 2 capacity Booster heater 1 capacity Flow temp Increase Flow temp Decrease Priority Ambient Cost CO2 Ambient Intelligent settings Min ...

Page 26: ...SD Yes No Select download data OFF Heat source Boiler Heater Boiler Outdoor thermostat IN5 FTC Main RC SD Yes No Select upload data Water pump input Electric energy meter Booster heater 1 capacity Pump 1 Booster heater 2 capacity Pump 2 Immersion heater Pump 3 F1 F2 F3 Delivered energy adjustment Heat meter Main RC Unrestricted access Installer only Shaded items relate to DHW functions These are o...

Page 27: ...tion mode ON for the main 3 way valve When filling of the DHW tank is complete the installer should access this menu again and press F3 to deactivate manual operation of the part Alternatively after 2 hours manual operation mode will no longer be active and FTC will resume control of the part Many functions cannot be set whilst the indoor unit is running The installer should turn off the unit befo...

Page 28: ...Flow sensor Maximum The maximum flow rate to be detected at Flow sensor 1 Decreasing time before pump switched off may increase the duration of stand by in Heating Cooling mode 2 Set the Running time according to the specifications of the actuator of each mixing valve It is recommended to set the interval to 2 minutes that is a default value With the interval set longer it could take longer to war...

Page 29: ... F3 and F4 buttons to select a refrigerant address of which you wish to configure or check the settings and press CONFIRM 1 4 The Pump speed screen is displayed 5 Use F1 and F2 buttons to set the pump speed 1 to 5 of DHW operation 6 Use F3 and F4 buttons to set the pump speed 1 to 5 of space heating cooling operation 1 For multiple outdoor units control system only Heat source setting screen Heat ...

Page 30: ...Flow temp range menu 1 Fast mode is not efficient and will increase running cost compared to normal mode Range of outdoor ambient temperature at which simultaneous operation starts is 30 to 10 C default 15 C System shall automatically return to routine operation This will happen when the outdoor ambient temperature rises above the selected temperature for this specific mode of operation Cold weath...

Page 31: ... kW 6 kW ERSC MED 0 kW 0 kW ERSD MED 0 kW 0 kW ERSC VM2D 2 kW 0 kW ERSC VM6D 2 kW 4 kW ERSC YM9D 3 kW 6 kW EHSE MED 0 kW 0 kW EHSE YM9ED 3 kW 6 kW ERSE MED 0 kW 0 kW ERSE YM9ED 3 kW 6 kW EHPX MED 0 kW 0 kW EHPX VM2D 2 kW 0 kW EHPX VM6D 2 kW 4 kW EHPX YM9D 3 kW 6 kW EHPX YM9ED 3 kW 6 kW ERPX MD 0 kW 0 kW ERPX VM2D 2 kW 0 kW ERPX VM6D 2 kW 4 kW ERPX YM9D 3 kW 6 kW 1 When the hydrobox is connected wi...

Page 32: ...tdoor units control system only Thermistor reading This function shows the current readings of thermistors located on the water and refrigerant circuit Thermistor Description Thermistor Description TH1A Zone1 room temperature TH7 Ambient outdoor temperature TH1B Zone2 room temperature THW6 Zone1 flow temperature TH2 Refrigerant liquid temperature THW7 Zone1 return temperature THW1 Flow water tempe...

Page 33: ...ting compensation curve FSout Freeze stat function ambient temperature COR CO Cooling flow temperature Error history Error history allows the service engineer to view previous check codes the unit address and the date on which they occurred Up to 16 check codes can be stored in the history and the most recent Error event is displayed at the top of the list 1 From the service menu select Error hist...

Page 34: ...ntil Complete appears 1 For multiple outdoor units control system only Completion 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 p...

Page 35: ... Water circulation pump 4 Accumulated operating time reset 504 Indoor unit Zone1 room temp TH1A 39 to 88 C 505 Indoor unit Ref liquid temp TH2 39 to 88 C 506 Indoor unit Return water temp THW2 39 to 88 C 507 Indoor unit Zone2 room temp TH1B 39 to 88 C 508 Indoor unit DHW tank water temp THW5B 39 to 88 C 509 Indoor unit Zone1 flow water temp THW6 39 to 88 C 510 Indoor unit Outside air temp TH7 39 t...

Page 36: ...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 0 1 0 00 ...

Page 37: ...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 0 1 1 00 ...

Page 38: ...x 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 2 3 4 5A 5B 6 7 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 ...

Page 39: ...x 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 2 3 4 5A 5B 6 7 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 ...

Page 40: ... 0 37 xx 0 0 0 1 1 1 0 0 38 xx 1 0 0 1 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 533 OUT Display 8 9 10 11 12 13 14 15 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...

Page 41: ... 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 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 ...

Page 42: ...n is now deactivated Emergency operation In emergency operation operation without connecting outdoor unit and main remote controller is pos sible During Emergency operation the main control has NO control functions Space heating flow temp is restarted 40 C and DHW tank temp is restricted 50 C 1 Heater Heating for DHW and space heating is provided by the heater Activating emergency operation mode T...

Page 43: ... phenomena 3 If no obvious problem can be found continue to operate the unit Note Electrical components should only be replaced as a final option Please follow instructions in 10 4 Self diagnosis and action and 10 5 Trouble shooting by inferior phenomena fully before resorting to replacing parts 10 2 Test Run Before a test run After installation of outdoor unit pipework and electrical wiring reche...

Page 44: ...e strainer for blockages Check the primary water circuit for leaks Check that the flow amount is within the recommended range 3 Valve operation fault 3 Check valves on primary water circuit are installed level 4 2 way valve local supply actuator fault 4 Electrically test to determine fault 5 3 way valve local supply actuator fault 5 1 Electrically test to determine fault 2 Operate 3 way valve manu...

Page 45: ...ing operation and when Main remote controller or Room RC 1 8 is chosen for the Room Sensor setting in the Initial setting 4 Replace wireless remote controller or main remote controller 5 Incorrect setting of the DIP switch es 5 Check the DIP switch setting s L6 Circulation water freeze protection DHW Heating Cooling LP FS OS Check code displayed when THW1 detects a temp 1ºC for 10 consecutive seco...

Page 46: ...witched on 1 Insufficient system head 1 Refer to table in 10 6 Checking Com ponent Parts Function to determine if system pump meets requirements If more head required either add a pump of the same size or replace existing pump with capacity model See 11 DISASSEMBLY PROCEDURE for how to replace pump 2 Reduced flow in primary water circuit Due to 1 or more of the following Faulty pump insufficient a...

Page 47: ...n See the manual for the thermistors PAC TH011HT E 2 Flow rate of the heating circuit from the boiler may be reduced 2 Check for water leakage strainer blockage water circulation pump function LD Boiler temperature thermistor THWB1 failure Refer to check codes P1 P2 L5 LD LE Boiler operation error Heating Boiler is running and THW6 detects a temperature 30ºC for consecutive 60 minutes 1 THW6 has b...

Page 48: ... remote controller circuit board 5 Electrical noise causes interference with transmission reception of data for main remote controller E3 E5 Main remote controller communication failure Transmission error Check code E3 is displayed if the main remote controller cannot find an empty transmission path and thus fails to transmit for 6 seconds or the data received by the main remote controller is diff...

Page 49: ...ectrical noise causes interference with wireless receiver communication cable J1 to J8 Wireless remote controller wireless receiver communication failure Reception error Check code displayed if wireless receiver receives no incomplete data from the wireless remote controller for 15 consecutive minutes The digit after the J refers to the address of the wireless remote controller that has the error ...

Page 50: ...tween FTC and outdoor unit 3 The main screen appears with a press of the ON button but disappears in a second The main remote controller operations do not work for a while after the settings are changed in the service menu This is because the system takes time to apply the changes Normal operation no action necessary The indoor unit is applying updated settings made in the service menu Normal oper...

Page 51: ...ry card is NOT inserted into the memory card slot with correct orientation 1 Correctly insert SD memory card in place until a click is heard 2 Not an SD standards compliant memory card 2 Use an SD standards compliant memory card Refer to section 5 6 in instal lation manual LED4 on FTC is blinking See 6 WIRING DIAGRAM 1 Full of data 1 Move or delete data or replace SD memory card with a new one 2 W...

Page 52: ...onnections of water circuit components 1 Tighten connections as required 2 Water circuit components reaching the end of life 2 Refer to PARTS CATALOG in the service manual for expected part lifetimes and replace them as necessary 13 Heating system does not reach the set higher temperature 1 Prohibit schedule timer or holiday mode se lected or demand control input IN4 or smart grid ready switch off...

Page 53: ...y be damaged 1 Turn the handle on the pressure relief valve to check for foreign objects in it If the problem is not still solved replace the pressure relief valve with a new one 2 If intermittent expansion vessel charge may have reduced bladder perished 2 Check pressure in expansion vessel Recharge to 1 bar if necessary If bladder perished replace expansion vessel with a new one 21 Water discharg...

Page 54: ...freeze stat function to adjust the outdoor ambient temperature as follows Refer to Freeze stat function on Page 30 Outdoor ambient temperature Cooling operation 3ºC higher than the preset temperature Stop 5ºC higher than the preset temperature Recover 33 The energy monitor value seems not cor rect Note There could be some discrepancies between the actual and the calculated values If you seek for a...

Page 55: ...te L min External static pressure kPa Speed 5 Default setting Speed 4 Speed 3 Speed 2 Speed 1 0 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 0 0 40 0 45 0 50 0 35 0 30 0 25 0 20 0 15 0 10 0 5 0 Figure 10 6 6 E PX series Flow rate L min External static pressure kPa Speed 5 Default setting Speed 4 Speed 3 Speed 2 Speed 1 55 Recommended water flow rate range Water Circulation Pump Characteristics Note F...

Page 56: ...9 10 Terminal Normal Abnormal 9 10 80 20 mΩ Open or Short 2 kW heater 230 V 1 phase 1 2 2 kW AWG15 FEP WHITE AWG15 FEP WHITE Terminal Normal Abnormal 1 2 26 5 3 1 3 Ω Open or Short 2 4 kW heater 230 V 1 phase 1 2 2 kW AWG15 FEP WHITE AWG15 FEP WHITE 3 4 2 kW AWG13 FEP BLUE AWG13 FEP BLUE 2 kW Terminal Normal Abnormal 1 2 26 5 3 1 3 Ω Open or Short 3 4 13 3 1 5 0 6 Ω Open or Short 3 6 kW heater 400...

Page 57: ...rt THWB1 1 2 3 4 BK WH BU BN SENSOR 5 VDC Vout MICRO PROCESSOR FTC CONTROLLER BOARD 4 3 5 V DC 2 3 Output Vout DC WITHOUT SIGNAL CN1A WH Flow signal 4 0 3 5 3 0 2 5 2 0 1 5 1 0 0 5 0 0 0 20 40 60 80 100 Flow L min Flow output signal V 0 35 V 1 3 4 RD BK WH SENSOR 5 VDC Vout M PROC FTC CONTROLLER 1 3 5 V DC 3 4 Output Vout DC CN401 WH 0 5 2 5 5 2 5 4 5 Vout V PRESSURE MPa 1 3 4 RD BK WH SENSOR 5 VD...

Page 58: ...or THW1 Return water temperature thermistor THW2 DHW tank water temperature thermistor THW5A 5B Zone1 flow temperature thermistor THW6 Zone1 return temperature thermistor THW7 Zone2 flow temperature thermistor THW8 Zone2 return temperature thermistor THW9 0 C 15 kΩ 10 C 9 6 kΩ 20 C 6 3 kΩ 25 C 5 2 kΩ 30 C 4 3 kΩ 40 C 3 0 kΩ Thermistor R0 15 kΩ 3 B constant 3480 2 Rt 15exp 3480 273 t 273 1 1 0 C 16...

Page 59: ...IN3 TBI 1 3 4 Flow switch 2 input IN6 TBI 2 5 6 Room thermostat 2 input CNBC Signal output for booster heater 230 VAC OUT11 TBO 3 5 6 Signal output Error 230 VAC OUT5 TBO 2 1 3 Mixing valve Local supply 1 2 Close 230 VAC 2 3 Open 230 VAC CNP4 OUT14 Water circulation pump4 230 VAC OUT3 TBO 1 5 6 Water circulation pump3 Local supply 230 VAC OUT2 TBO 1 3 4 Water circulation pump2 Local supply 230 VAC...

Page 60: ...Refer to Draining the Hydrobox on page 21 When draining the hydrobox keep water from splashing on the internal parts mainly electric parts and insulations DISASSEMBLY PROCEDURE Photo 1 1 Photo 1 2 Photo 2 2 Photo 2 3 Photo 2 1 1 How to remove the front panel 1 Remove the 2 screws at the bottom of the hydrobox Photo 1 1 2 Slightly lift and pull out the front panel from the hydrobox Photo 1 1 3 Disc...

Page 61: ... hold the contac tors by hand when removing the last screws To prevent an electrical shock wait until all the LED lamps on the FTC control board are turned off Terminal block Photo 3 2 4 Disconnect all the lead wires from the terminal block To disconnect the S1 S2 and S3 lead wires disengage the locks by pressing on the claws 5 Remove the screw on the terminal block Note To avoid dropping of the t...

Page 62: ...o Procedure 1 2 Remove the 2 screws from the control box bracket R and the 2 screws from the control box bracket L Photo 4 1 and 4 2 3 Disengage the control box bracket R from the right hand side panel and pull the control box At this point lifting slightly and pulling the control box will swing the control box to the front Photo 4 3 Note Disconnect the field wiring as necessary Cable strap Earth ...

Page 63: ...e front Refer to Procedure 4 5 E SC D series Close OFF the pump valve and remove the G1 nuts using 2 spanners one to hold the G1 nut and the other to turn the other side of G1 nut Remove the water pump by sliding it horizontally Photo 5 2 When the pump valve handle is stiff turn the handle 90 degrees clockwise mainly by using a spanner When reinstalling the G1 nuts use new G1 gaskets Photo 5 3 Set...

Page 64: ...installing the G1 nuts use new G1 gaskets Photo 5 3 Set the water pump in the way that the die stamped arrow facing left and the lead wire connectors facing to the up Photo 5 8 Be sure to change the pump and the water pump lead wire together Be sure to wipe water around the surface of the pump and the water pump lead wire thoroughly Pump valve 6 Remove the 2 screws fixing the pump valve stay Photo...

Page 65: ...onnection Cable straps Fastener Lead wire CN1A connector Flow sensor Photo 6 2 Photo 6 3 O rings O ring Sensor part Flow direction O ring Same diameter quick connection Same diameter quick connection Lead wire 7 How to remove the booster heater Steps 1 through 4 are applied to all the following units 1 Remove the front panel Refer to Procedure 1 2 Disconnect the booster heater lead wires from the ...

Page 66: ...remove the booster heater with the heater stay from the back panel Photos 7 2 7 3 and 7 4 12 Remove the 2 screws on the back of the heater stay and remove the heater stay from the booster heater Photo 7 4 Reuse the removed heater stay and the screws Model Lead wire No Contactor EHSC VM2D ERSC VM2D EHSD VM2D ERSD VM2D EHPX VM2D ERPX VM2D No 1 BHC1 U No 2 BHC1 V EHSC VM6D EHSD VM6D EHPX VM6D ERSD VM...

Page 67: ...the coated clamp Photo 8 1 5 Close the strainer valve OFF Photos 8 1 8 5 and 8 7 When the strainer valve handle is stiff turn the handle 90 degrees clockwise mainly by using a spanner When opening or closing the strainer valve ensure to do so fully not halfway 6 Remove the water pump and the pump valve Refer to Procedure 5 7 Remove the expansion vessel Refer to Procedure 12 8 Remove the saddle ban...

Page 68: ...C by detaching the quick connection from the plate heat exchanger Photo 8 4 EHSC series Remove the strainer valve by detaching the quick connection from the plate heat exchanger Photo 8 1 When reinstalling the quick connections use a new O ring Refer to Procedure 16 for how to attach and detach the quick connection 14 Remove the TH2 thermistor from the thermistor holder Refer to Procedure 14 Photo...

Page 69: ...lling the quick connection use a new O ring Refer to Procedure 16 for how to attach and detach the quick connection 13 Remove the TH2 thermistor from the thermistor holder Refer to Procedure 14 Photos 14 2 and 14 3 14 Remove the plate heat exchanger with water coil cover by lifting it upward after removing the 2 screws on the water coil cover Photo 8 5 15 Remove the water coil cover and the water ...

Page 70: ...ng the strainer valve ensure to do so fully not halfway 6 Remove the water pump and the pump valve Refer to Procedure 5 7 Remove the joint WC PUMP by removing the 2 screws and detaching the different diameter quick connection Photo 8 7 When reinstalling the different diameter quick connection use a new O ring Refer to Procedure 16 for how to attach and detach the quick connection Photo 8 7 Water c...

Page 71: ...screws Photo 8 7 12 Pull out the plate heat exchanger from the hydrobox by lifting it upward Photos 8 9 and 8 10 13 Remove the strainer valve by detaching the different diameter quick connection from the plate heat exchanger Photos 8 8 and 8 9 When reinstalling the different diameter quick connection use a new O ring Refer to Procedure 16 for how to attach and detach the quick connection Photo 8 9...

Page 72: ...ion 7 Remove the strainer valve stay by removing the 2 screws Photos 10 2 and 10 5 Reuse the removed L joint the strainer valve stay and the strainer valve stay fixing screws Removal of the strainer cover debris recovery 4 Remove the cover with 2 spanners one to hold the strainer valve and the other to turn the cover Photos 10 1 10 4 and 10 6 Be sure to reattach the mesh after washing Photo 10 3 W...

Page 73: ...Photo 11 3 When reinstalling the manometer assembly on the hydrobox beware not to put strain on the root of the capillary tube as the capillary tube is easy to break at the root Pressure relief valve 3 bar 3 Remove the field piping from the pressure relief valve 4 Remove the manometer by removing the G1 4 nut When reinstalling the G1 4 nut use a new G1 4 gasket Photo 11 2 5 Remove the pressure rel...

Page 74: ...sel Photo 12 2 When reinstalling the flare joint use a new G3 8 gasket Note To avoid dropping of the expansion vessel hold it securely when removing it Photo 12 2 Expansion vessel Air vent Photo 11 7 Air vent Flare joint Expansion vessel Flare joint Photo 11 8 Photo 12 1 Screws Flare joint Metal support Flare nut Gasket G3 8 11 How to remove the manometer pressure relief valve air vent automatic C...

Page 75: ... Photos 14 2 14 3 14 4 14 5 and 14 6 Connectors CN21 CNW12 THW2 thermistor Photo 14 3 ERS series THW1 thermistor TH2 thermistor TH2 thermistor THW1 thermistor THW2 thermistor 13 How to remove the drain cock the air vent manual pri mary circuit 1 Remove the front panel Refer to Procedure 1 2 Swing the control box to the front Refer to Procedure 4 3 Remove the drain cock and the air vent manual prim...

Page 76: ... the removed saddle band rubber tube and screws fixing the saddle band and rubber tube 5 Remove the 3 screws each on the cover plate Photos 15 3 and 15 4 6 ERS series Remove the cover plate from the base assy Photo 15 5 ERPX series Remove the 2 cover plates from the base assy Photo 15 6 Photo 15 3 ERS series Screws Photo 15 5 ERS series Base assy Strainer valve stay Cover plate Cover plate Rubber ...

Page 77: ... Side panel R 15 How to remove the drain pan ER series 7 Remove the 3 screws each on the side panel L R Then remove the 2 screws on the base assy Photo 15 7 8 Remove the 5 screws on the base assy Photo 15 8 9 Remove the drain pan from the base assy Photo 15 9 10 Only ERS series Remove the strainer valve holder by removing the 2 screws from the drain pan Photo 15 10 Reuse removed the strainer valve...

Page 78: ...ase on the O ring using a plastic bag etc Photo 16 4 4 Attach the O ring to the male part of quick connection Photo 16 5 Keep the O ring free from dirt or foreign matters 5 Connect the male and female parts of the quick connection Photo 16 6 6 Attach the clip Photo 16 7 Ensure to attach the wider diameter of the clip to the fe male side Failure to do so it may cause water leak at the connected par...

Page 79: ...t until soft and then eliminate it with a wire brush Note When using the products above refer to the appropriate manuals that come with the individual products Table 11 2 Part name 1 Recommended tightening torque Nm 2 Pressure relief valve 3 bar 15 1 Pressure relief valve 5 bar 15 1 1 For more details about the listed parts refer to the parts catalogue 2 Undertightening and overtightening the part...

Page 80: ...r temperature thermistor is an optional part 2 OUT10 has no voltage across it 3 Boiler heating is controlled on off by the room temp thermostat Remote controller settings 1 Go to Service menu Heat source setting and choose Boiler or Hybrid 4 2 Go to Service menu Operation settings Boiler settings to make detailed settings for Hybrid above 4 The Hybrid automatically switches heat sources between He...

Page 81: ...30 min Heating Cooling 3 Zone1 operation mode Heating room temp Heating flow temp Heating compensation curve Cooling flow temp Room temp Zone2 operation mode 2 Heating room temp Heating flow temp Heating compensation curve Cooling flow temp Compensation curve Compensation curve Hi flow temp set point Zone1 outdoor ambient temp 30 C to 33 C 8 15 C Zone1 flow temp 20 C to 60 C 50 C Zone2 outdoor amb...

Page 82: ...um 0 to 100 L min 100 L min Analog output Interval 1 to 30 min 5 min Priority Normal High Normal Pump speed DHW Pump speed 1 to 5 5 Heating Cooling Pump speed 1 to 5 5 Heat source setting Standard Heater Boiler Hybrid 13 Standard Heat pump setting Heat pump flow rate range Minimum 0 to 100 L min 5 L min Maximum 0 to 100 L min 100 L min Quiet mode Day Mon to Sun Time 0 00 23 45 Quiet level Normal L...

Page 83: ...000 pulse kWh External in put settings Demand control IN4 Heat source OFF Boiler operation Boiler operation Outdoor thermostat IN5 Heater operation Boiler operation Boiler operation Thermo ON output Zone1 Zone2 Zone1 2 Zone1 2 1 The settings related to Zone2 can be switched only when 2 zone temperature control or 2 zone valve ON OFF control is active 2 The settings related to Zone2 can be switched...

Page 84: ...anical Frequency Notes 1 Inspect grill heat exchanger fins and air inlet for trapped debris damage 2 Check condensate drain provision 3 Check integrity of water pipe work and insulation 4 Check all electrical connections 5 Check and record the operation voltage All the above checks should be carried out once a year Note Within the first couple of months of installation remove and clean the hydrobo...

Page 85: ...85 OCH712C ...

Page 86: ...N Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued Oct 2020 No OCH712 REVISED EDITION C Issued Apr 2020 No OCH712 REVISED EDITION B Issued Feb 2020 No OCH712 REVISED EDITION A Published Oct 2019 No OCH712 Made in Japan Specifications are subject to change without notice ...

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