Mitsubishi Electric EHSC-VM6A Service Manual Download Page 59

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DISASSEMBLY PROCEDURE

PHOTOS

10. How to remove the manometer / pressure relief valve / air

vent (automatic) (Continued)

<Air vent (automatic)>

(4) Remove the air vent with a flare joint using two spanners:

one to hold the flare joint and the other to turn the flare
nut.

(5) Remove the flare joint from the air vent. (Photo 10-6)

11. How to remove the expansion vessel.

(1) Remove the front panel. (Refer to Procedure 1.)
(2) Swing the control box to the front. (Refer to Procedure 4.)
(3) Remove the flare nut using two spanners: one to hold the

flare joint and the other to turn the flare nut. (Photo 11-1)

(4) Remove the 2 screws on the metal support.

Note: To avoid dropping of the expansion vessel, hold the

expansion vessel with the metal support by hand
when removing the last screw.

(5) Pull out the metal support. (Photo 11-1)
(6) Pull out the expansion vessel. (Photo 11-1)
(7) Remove the flare joint from the expansion vessel.

(Photo 11-2)

When reinstalling the flare joint, use a new 3/8" gasket.

Note: To avoid dropping of the expansion vessel, hold it

securely when removing it,

Photo 11-2

Expansion vessel

Flare nut

Air vent

Photo 10-5

Air vent

Flare joint

Expansion vessel

Flare joint

Photo 10-6

Photo 11-1

Screws

Expansion vessel

Flare joint

Metal support

Flare nut

Gasket 3/8"

Summary of Contents for EHSC-VM6A

Page 1: ... DIAGRAM 20 9 CONTROLS 21 10 TROUBLESHOOTING 36 11 DISASSEMBLY PROCEDURE 49 12 SUPPLEMENTARY INFORMATION 63 13 SERVICE AND MAINTENANCE 64 July 2011 Note This manual describes only service data of Hydrobox RoHS compliant products have G mark on the spec name plate R410A MAIN CONTROLLER PARTS CATALOG OCB503 Model name EHSC VM6A EHSC YM9A EHPX VM2A Service Ref EHSC VM6A UK EHSC YM9A UK EHPX VM2A UK H...

Page 2: ...HZ HRP71 100VHA2 PUHZ HRP71 100VHA2R1 PUHZ HRP100VHA2R2 PUHZ HRP100 125YHA PUHZ HRP100 125YHA2 PUHZ HRP100 125YHA2R1 PUHZ W50 85VHA OCH439 PUHZ W50 85VHA BS PUHZ W85VHAR1 PUHZ W85VHAR1 BS PUHZ W85VHA2 UK OCH465 PUHZ W85VHA2 BS UK PUHZ HW112 140YHA OCH439 PUHZ HW112 140YHA BS PUHZ HW112 140YHA2 PUHZ HW112 140YHA2 BS PUHZ HW140VHA PUHZ HW140VHA BS PUHZ HW140VHA2 PUHZ HW140VHA2 R1 BS ...

Page 3: ...se illness to the user Do not stand on the units Do not touch switches with wet hands Annual maintenance checks on both the hydrobox and the outdoor unit should be done by qualified person Do not place items containing liquid in on top of the hydrobox If they leak or spill onto the hydrobox damage to the unit and or fire could occur Do not place any heavy items on top of the hydrobox When installi...

Page 4: ...ause the oil to deteriorate Use the following tools specifically designed for use with R410A refrigerant The following tools are necessary to use R410A refrigerant Contact your nearest dealer for any questions Tools for R410A Gauge manifold Flare tool Charge hose Size adjustment gauge Gas leak detector Vacuum pump adapter Torque wrench Electronic refrigerant charging scale Be sure to use the corre...

Page 5: ...um pump adaptor Size adjustment gauge Gauge manifold Torque wrench Gas leak detector Charge hose Tools for R410A Contamination inside refrigerant piping can cause deterio ration of refrigerant oil etc If dirt dust or moisture enters into refrigerant cycle it can cause deterioration of refrigerant oil or malfunction of com pressor If large amounts of mineral oil enters it can cause deterio ration o...

Page 6: ...d be performed with the cylinder of syphon stood vertically Refrigerant is charged from liquid phase 3 Service tools Use the service tools below as exclusive tools for R410A refrigerant No Tool name Specifications 1 Gauge manifold Only for R410A Use the existing fitting specifications UNF1 2 Use high tension side pressure of 5 3 MPa G or over 2 Charge hose Only for R410A Use pressure performance o...

Page 7: ...Primary circuit circulating Pump Grundfos UPSO 25 70 180 Connections Water 28 mm compression primary circuit Refrigerant R410A Liquid 9 52 mm 9 52 mm Gas 15 88 mm 15 88 mm Operating ambient condition 0 1 35 C 80 RH Electrical data Control board Power supply Phase voltage frequency N 230 V 50 Hz Breaker when powered from independent source 10A Booster heater Power supply Phase voltage frequency N 2...

Page 8: ...n pump 10 Pressure relief valve 11 Flow switch 12 Plate heat exchanger 13 Strainer valve A Inlet from space heating Indirect DHW cylinder primary return B Outlet to space heating Indirect DHW cylinder primary flow C Refrigerant Liquid D Refrigerant Gas E Discharge from pressure relief valve installer to pipe connect to suitable drain point 1 2 3 4 6 5 7 8 9 11 10 12 13 A B C D E EHSC Split model s...

Page 9: ... Water circulation pump 10 Pressure relief valve 11 Flow switch 13 Strainer valve A Inlet from space heating Indirect DHW cylinder primary return B Inlet from heat pump C Outlet to heat pump D Outlet to space heating Indirect DHW cylinder pri mary flow E Discharge from pressure relief valve installer to pipe connect to suitable drain point 1 2 3 7 8 9 10 11 13 A B C D E EHPX Packaged model system ...

Page 10: ...ssure relief valve G1 2 female valve port within hydrobox casing F Electrical cable inlets The leftmost inlet is for wireless receiver option Letter Pipe description Connection size type A Space heating Indirect DHW cylinder pri mary return connection 28 mm Compression B Flow connection from heat pump 28 mm Compression C Return connection to heat pump 28 mm Compression D Space heating Indirect DHW...

Page 11: ... Parameter Dimension mm a 200 b 150 c 500 d 500 Sufficient space MUST be left for the provision of discharge pipework as detailed in National and Local building regulations The hydrobox must be located indoors and in a frost free environment for example in a utility room ...

Page 12: ... See Chapter 6 4 12 6 WIRING DIAGRAM 6 1 EHSC VM6A ...

Page 13: ... See Chapter 6 4 13 6 2 EHSC YM9A ...

Page 14: ... See Chapter 6 4 14 6 3 EHPX VM2A ...

Page 15: ...heater OFF SW1 5 Booster heater WITHOUT booster heater WITH booster heater ON SW1 6 Booster heater function For heating only For heating and DHW OFF SW1 7 Outdoor unit type Split type Packaged type OFF EHSC ON EHPX SW1 8 Wireless remote controller WITHOUT wireless remote controller WITH wireless remote controller OFF SW2 SW2 1 Room thermostat input IN1 logic change Operation stop at thermostat sho...

Page 16: ...act separation in each pole shall be provided Use earth leakage breaker NV The breaker shall be provided to ensure disconnection of all active phase conductors of the supply 2 Max 45 m If 2 5 mm used Max 50 m If 2 5 mm used and S3 separated Max 80 m 3 The values given in the table above are not always measured against the ground value Notes 1 Wiring size must comply with the applicable local and n...

Page 17: ...provided Use earth leakage breaker NV The breaker shall be provided to ensure disconnection of all active phase conductors of the supply 2 Max 45 m If 2 5 mm used Max 50 m If 2 5 mm used and S3 separated Max 80 m 3 The values given in the table above are not always measured against the ground value Notes 1 Wiring size must comply with the applicable local and national codes 2 Indoor unit outdoor u...

Page 18: ... A 1 2 5 mm 6 kW EHSC VM6A 32 A 1 6 0 mm Hydrobox power supply N 230 V 50 Hz Hydrobox input capacity Main switch Breaker 1 16 A Wiring Wiring No size mm Hydrobox power supply 2 Min 1 5 Hydrobox power supply earth 1 Min 1 5 Hydrobox Outdoor unit 2 2 Min 0 3 Hydrobox Outdoor unit earth Circuit rating Hydrobox L N 3 AC230V Hydrobox Outdoor unit S1 S2 3 Hydrobox Outdoor unit S2 S3 3 DC24V 1 A breaker ...

Page 19: ...30V Hydrobox Outdoor unit S1 S2 3 Hydrobox Outdoor unit S2 S3 3 DC24V 1 A breaker with at least 3 0 mm contact separation in each pole shall be provided Use earth leakage breaker NV The breaker shall be provided to ensure disconnection of all active power i e phase AND neutral conductors of the supply 2 Max 120 m 3 The values given in the table above are not always measured against the ground valu...

Page 20: ... prevent a corrosive reaction taking place which will damage the pipework 5 Check for leaks If leaks are found retighten the screws on the connections 6 Pressurise system to 1 bar 7 Release all trapped air using air vents during and following heating period 8 Top up with water as necessary If pressure falls below 1 bar Filling the System Primary Circuit Draining the Hydrobox WARNING DRAINED WATER ...

Page 21: ...operate Please beware that without these safety functions in operation the cylinder may be damaged Main screen icons Icon Description 1 Legionella prevention When this icon is displayed Legionella Prevention mode is active if DHW tank in system 2 Heat pump When this icon is displayed the Heat pump is in use 3 Electric heater When this icon is displayed the Electric heaters are in use 4 Target temp...

Page 22: ...t Time select Time setting Temp setting Holiday setting DHW active non active Heating active non active Holiday menu Heating room temp Heating flow temp Initial settings Date Time yyyy mm dd hh mm Language ENG GER FR NL SP IT PT DA SW NOR FIN C F C F Temp display ON OFF Contact number Time display hh mm hh mm AM AM hh mm Room sensor setting Sensor setting TH1 Main controller Room RC1 8 Time Zone S...

Page 23: ...setting Error history Password protection Manual reset In this Installation Manual instructions will be given only for the following func tions Auxiliary setting Manual operation Heat source setting Password protection Manual reset Information on the other functions can be found by consulting the technical or service manuals 1 2 3 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 Screen 1 of service menu Scree...

Page 24: ...Space heating screen is displayed Press F1 button to switch the function ON OFF Use F3 and F4 buttons to adjust the time period of heat pump only operation before the booster heater will assist in space heating 5 180mins Electric heater DHW From the Auxiliary Setting menu highlight Electric heater DHW Press CONFIRM The Electric heater DHW screen is displayed Press F1 button to switch the function ...

Page 25: ...t be selected if the system is running A screen will be displayed asking the installer to stop the sys tem before these modes can be activated The system automatically stops 2 hours after last operation The OUT13 output of the 2 way valve 2 constitutes an inversion of the OUT4 output of the 2 way valve 1 1 2 3 4 5 Manual operation menu screen System off prompt screen Function Setting Function Sett...

Page 26: ...Indoor unit Dip SW3 setting information Refer to detail contents described hereinafter 165 Indoor unit Dip SW4 setting information Refer to detail contents described hereinafter 175 Indoor unit Output signal information Refer to detail contents described hereinafter 176 Indoor unit Input signal information Refer to detail contents described hereinafter 190 Indoor unit Software version 1st 4 digits...

Page 27: ...reen is displayed To alter the time period at which date will be collected use F1 and F2 buttons to highlight Temp control interval Press CONFIRM Use F3 and F2 buttons to alter the time interval Note Range 10 60 minutes at 10 minute intervals default 10 minutes To alter the flow temperature limits use F1 and F2 buttons to highlight Flow temperature range Press CONFIRM Flow temperature range screen...

Page 28: ...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 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 29: ...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 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 30: ... 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 2 3 4 5 6 7 8 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 31: ...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 2 3 4 5 6 7 8 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 x...

Page 32: ...1 0 0 0 1B xx 0 0 1 1 1 0 0 0 1C xx 1 0 1 1 1 0 0 0 1D xx 0 1 1 1 1 0 0 0 1E xx 1 1 1 1 1 0 0 0 1F xx Input signal display Request code 176 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 0 0 00 00 1 0 0 0 0 0 0 0 00 01 0 1 0 0 0 0 0 0 00 02 1 1 0 0 0 0 0 0 00 03 0 0 1 0 0 0 0 0 00 04 1 0 1 0 0 0 0 0 00 05 0...

Page 33: ...W operation mode Normal Eco COR CO Ltemp Legionella hot water temp Hroom Heating target room temp Lfreq Legionella operation Frequency Hflow Heating target flow temp Lstart Legionella mode start time Croom Ltime Legionella max operation time Cflow Lkeep Duration of max Legionella hot water temp FSflow Freeze stat function flow temp FSout Freeze stat function ambient temp Error History Error histor...

Page 34: ...d you entered or have to service a unit somebody else installed you can reset the password to the factory default of 0000 From the main settings menu scroll down the functions until Service Menu is highlighted Press CONFIRM You will be prompted to enter a password Hold down buttons F3 and F4 together for 3 secs You will be asked if you wish to continue and reset the password to default set ting To...

Page 35: ...ssing F1 all other buttons are disabled Activating Emergency operation mode To activate Emergency operation see the following Switch OFF the breaker for the outdoor unit or both breakers if cylinder pow ered independently Change DIP switch SW4 5 to ON Switch ON the breaker s Emergency Operation is now activated Deactivating Emergency operation mode To deactivate Emergency operation see the followi...

Page 36: ...ble 10 5 Trouble shooting by inferior 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 Tables 10 4 and 10 5 Error Codes and Inferior Phenom ena fully before resorting to replacing parts 10 2 Test Run Before a test run After installation of outdoor unit pipework and electric...

Page 37: ...19 42ºC Exceptions Error code will not be displayed if During defrost and 10 mins after defrost operation For 10 mins after pump1 is switched on When THW1 10deg 1 Connector terminal wire has become detached or loose wiring 1 Visually check the terminals and connections and reattach as appropriate 2 THW3 fault 2 Check resistance of thermistor against table in section 10 6 Compare FTC3 detected temp...

Page 38: ... 10 con secutive seconds Exception Error code will not be displayed if FS function is disabled Water circulation pump1 runs for 10 mins 1 Insufficient system head 1 Refer to table in section 10 6 to determine if system pump meets requirements If more head required either add an pump of the same size or replace existing pump with capacity model See 11 DISASSEMBLY PROCEDURE for how to replace pump 2...

Page 39: ...e detached from its holder 1 Visually inspect location and reattach as necessary 2 Booster heater fault 2 Electrically test to determine fault See 10 6 for how to check 3 THW1 or THW2 or THW5B fault 3 Check resistance of thermistor against table in section 10 6 Compare FTC3 detected temperature to hand held detector 4 FTC3 board failure 4 Replace board L9 Low primary circuit flow rate detected by ...

Page 40: ...h for 3 mins and thus cannot transmit or the data sent by the FTC3 is different to what was expected 30 consecutive times 1 2 or more main controllers have been con nected to the FTC3 1 Only connect 1 main controller to 1 FTC3 indoor unit board 2 Fault with main controller transmission re ceiving circuit board 2 to 4 Turn the power to the indoor unit OFF and then ON Power to both the indoor unit a...

Page 41: ...oor unit If the J0 code is still displayed the FTC3 and or the wireless receiver circuit board should be replaced replaced 3 Fault with wireless receiver s transmission circuit board 4 Electrical noise causes interference with wireless receiver communication cable J1 to J8 Wireless remote controller wireless receiver communication failure Reception error Error code displayed if wireless receiver r...

Page 42: ...lso off FTC3 powered via outdoor unit 1 Power supply of rated voltage is not supplied to outdoor unit 1 Check the voltage of outdoor power supply terminal block L N or L3 N When AC220 240V is not detected check the power wiring to outdoor unit and the breaker When AC 220 240V is detected check 2 below 2 Defective outdoor controller circuit board 2 Check the voltage between outdoor terminal block S...

Page 43: ...on heater thermostat and press reset button located on immersion heater boss if safe If the heater has been operated with no water inside it may have failed so please replace it with a new one 8 Immersion heater breaker ECB2 has tripped 8 Check the cause of the trip and reset if safe 9 3 way valve 2 way valve field supply fault 9 Check plumbing wiring to 3 way valve 2 way valve field supply 8 It t...

Page 44: ...s water supply With hydrobox cold check pressure in hydrobox If necessary discharge re fill system to the recommended cold fill pressure of 1 bar 4 Unit has overheated thermal controls have failed 4 Switch off power to the heat pump Leave water supply on Wait until discharge stops Isolate water supply and replace if faulty 16 Water discharges from pressure relief valve Sanitary circuit 1 If contin...

Page 45: ...speed will be greater than 1 5 m s which could corrode the pipes Recommended water flow rate range Water Circulation Pump Characteristics EHSC series EHPX series speed3 Default setting speed2 speed1 External static pressure kPa 0 10 20 30 40 50 60 70 80 0 Flow rate L min Flow rate L min 30 40 10 20 50 0 30 40 10 20 50 External static pressure kPa 0 10 20 30 40 50 60 70 80 speed3 Default setting sp...

Page 46: ...en or Short 3 4 13 3 1 5 0 6 Ω Open or Short 3 6kW heater 400V 3 phase 5 6 AWG15 FEP WHITE AWG15 FEP WHITE AWG13 FEP BLUE 2kW 4 AWG15 FEP WHITE 2kW 2kW 2 3 1kW 1 1kW 1kW AWG13 FEP BLUE AWG13 FEP BLUE Terminal Normal Abnormal 1 2 2 3 1 3 105 8 11 8 5 Ω Open or Short 4 5 5 6 4 6 52 9 5 8 2 5 Ω Open or Short Flow switch Measure the resistance between the terminals with a tester State of moving part N...

Page 47: ...30 40 50 Temperature Resistance k 500 400 300 200 100 0 25 50 75 100 120 Temperature Resistance k 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 THW5B 0 C 15kΩ 10 C 9 6kΩ 20 C 6 3kΩ 25 C 5 2kΩ 30 C 4 3kΩ 40 C 3 0kΩ Thermist...

Page 48: ...eater1 230V AC CNBH 5 7 OUT7 TBO 2 7 8 Signal output for booster heater2 230V AC OUT8 TBO 2 9 10 Signal output for booster heater2 230V AC OUT11 TBO 2 11 12 Signal output Error 230V AC OUT12 TBO 2 13 14 Signal output Defrost 230V AC CNIHT IHT TBO 3 1 2 Thermostat input for immersion heater field supply CNIH OUT9 TBO 3 5 6 Signal output for immersion heater field supply 230V AC TH1 TH1 TBI 1 1 2 Th...

Page 49: ...equate ventilation After stopping the operation of the cylinder and outdoor unit turn off the power supply breaker and remove the power plug Discharge the condenser before the work involving the electric parts Allow parts to cool Do not expose the electric parts to water When replacing or servicing water circuit parts drain system first 1 How to remove the front panel 1 Remove the 2 painted screws...

Page 50: ... 2 screws on each contactor Note To avoid dropping of the contactors hold the contactors by hand when removing the last screws 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 terminal block hold the termi nal ...

Page 51: ...e 2 screws from the 2 control box brackets R 3 Remove the cable straps 4 Disengage the 2 control box brackets 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 2 Note Remove the field wiring as necessary Control box Cable straps Earth cable Brackets R Side panel Swing Screw Screw ...

Page 52: ...nd fixing the pump to the pump support under Photos 5 2 5 3 w When either of the pump valve handles is stiff remove the handle and turn the vertical stem 90 degrees clockwise mainly by using a spanner Photo 5 5 w Set the water pump in the orientation of the arrow printed on the water pump and in the way that the terminal box faces to the front Photo 5 2 w When reinstalling the 1 1 2 nuts use new 1...

Page 53: ...flow switch lead wire from the 3 cable clamps the cable strap the fastener and the 2 coated clamps and feed the lead wire out the control box without putting strain on the CN2F connector Photo 6 1 5 Swing the control box to the front Refer to Procedure 4 6 Remove the flow switch by removing the nut Photo 6 2 w When reinstalling the nut use a new O ring Photo 6 3 Note To ensure the correct function...

Page 54: ... one to hold the flare joint and the other to turn the flare nut 8 Remove the two screws that hold the heater stay onto the back panel Lift the booster heater slightly and remove the booster heater with the heater stay from the back panel 9 Remove the 2 screws on the back of the heater stay and remove the heater stay from the booster heater Photo 7 3 Model Lead wire No Contactor EHSC VM6A No 1 BHC...

Page 55: ...ntinued 10 Remove the flare joint from the booster heater Photo 7 4 w When reinstalling the flare joint use a new 3 8 gasket 11 Remove the drain cock primary circuit from the booster heater Photo 7 4 w Replace the removed drain cock primary circuit The drain cock can not be reused Drain cock Photo 7 5 Band Thermistor cable Flare joint Booster heater Bottom view of the booster heater Gasket 3 8 ...

Page 56: ... 1 gasket 8 How to remove the plate heat exchanger 1 Pump down the refrigerant circuit and close the stop valve on the indoor unit Refer to 12 Supplementary information 2 Remove the front panel Refer to Procedure 1 3 Remove the control box cover Refer to Procedure 3 4 Disconnect the CNP1 connector on the controller board and the earth cable in the control box 5 Release the water pump lead wire fro...

Page 57: ... remove the CN2F connector on the controller board w When reinstalling the flow switch use a new O ring 17 Remove the flare nuts on the gas and liquid pipes under the hydrobox using two spanners one to hold each flare joint and the other to turn each flare nut 18 Remove the plate heat exchanger cover by removing the 2 screws Photo 8 5 19 Remove the plate heat exchanger assembly from the hydrobox C...

Page 58: ...e from the cable clamp and feed the capillary tube through the bottom out the hydrobox wWhen reinstalling the 1 4 nut use a new 1 4 gasket Photo 10 2 5 Remove the manometer from the manometer stay while pressing on the claws Photo 10 3 w 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 ...

Page 59: ...re joint and the other to turn the flare nut Photo 11 1 4 Remove the 2 screws on the metal support Note To avoid dropping of the expansion vessel hold the expansion vessel with the metal support by hand when removing the last screw 5 Pull out the metal support Photo 11 1 6 Pull out the expansion vessel Photo 11 1 7 Remove the flare joint from the expansion vessel Photo 11 2 w When reinstalling the...

Page 60: ...e front Refer to Procedure 4 3 Cut the band 4 Cut the pipe cover tape about 10 cm from the top and peel off the pipe cover Photo 13 1 w Reattach the pipe cover after reconnecting the flexible hose 5 Loosen the flexible hose nuts on both ends and remove the flexible hose Photos 13 1 13 2 w When reinstalling the nuts use new 1 gaskets Photo 12 1 Drain cock Booster heater Photo 13 1 Nut 1 Refrigerant...

Page 61: ...mistor holders Photo 15 1 15 How to remove the thermistor booster heater THW3 1 Remove the front panel Refer to Procedure 1 2 Remove the control box cover Refer to Procedure 3 3 Disconnect the THW3 connector on the control board Photo 14 1 4 Release the THW3 lead wire from the cable clamp the cable strap the 2 fasteners and the 2 coated clamps Feed the lead wire out the control box without putting...

Page 62: ...wire brush Note When using the products above refer to the appropriate manuals that come with the individual products PARTS CATALOG Recommended tightening torque Nm 2 Page No Part No Part name 1 3 5 7 9 11 2 BH50R353H02 PRESSURE RELIEF VALVE 3bar 15 1 7 12 BH50R377H01 DRAIN COCK 15 1 1 For more details about the listed parts refer to the parts catalogue included in this manual 2 Undertightening an...

Page 63: ... gauge to the port on the low pressure side of the compressor refrigerant pipe work Change the position of the connector CN31 to ON and change DipSW4 2 to OFF on the outdoor unit PCB Change the DipSW4 5 on the indoor unit to ON 3 Switch ON power to the outdoor unit If the indoor unit is powered independently switch on power to the indoor unit FIRST then switch on power to the outdoor unit Outdoor ...

Page 64: ... 25 C 60 C 25 C Hi set point Outdoor ambient temp 15 C 35 C 15 C Flow Temp 25 C 60 C 50 C Adjust Outdoor Ambient Temp 14 C 34 C Flow temp 25 C 60 C Schedule timer Active Yes No No Holiday DHW 2 Active Non active Non active Heating Active Non active Active Heating room temp 10 C 30 C 15 C Heating flow temp 25 C 60 C 35 C Initial settings Language ENG PT NOR FIN NL DA IT SP SW GER FR ENG C F C F C T...

Page 65: ...ary Outdoor heat pump unit maintenance record sheet Model number Serial number Mechanical 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 ...

Page 66: ...3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2011 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Jul 2011 No OCH503 Made in Japan New publication effective Jul 2011 Specifications subject to change without notice ...

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