Mitsubishi EHPT20X-MHCW Service Manual Download Page 92

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DISASSEMBLY PROCEDURE

PHOTOS

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

vent (automatic)

<Pressure relief valve (3 bar)>

(3) Remove the field piping from the pressure relief valve (3

bar). (Photo 11-5)

(4) Remove the pressure relief valve (3 bar) with the flare

joint using 2 spanners: one to hold the flare joint and the

other to turn the flare nut. (Photo 11-5)

(5) Remove the pressure relief valve (3 bar) using 2

spanners: one to hold the flare joint and the other to turn

the pressure relief valve (3 bar). (Photo 11-6)

(6) Eliminate loctite on the thread surfaces using remover.

(Photo 11-6)

•

Before reinstallation, apply loctite over the thread

surface on the pressure relief valve.

•

For more details about the loctite and the remover,

refer to Page 101.

<Air vent (automatic)>

(3) Remove the air vent (automatic) using 2 spanners: one

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

(Photos 11-5)

(4) Remove the air vent with the flare joint. (Photo 11-5)

(5) Remove the flare joint from the air vent. (Photo 11-7)

<Pressure relief valve (10 bar) (Except for EH*T20*-MHCW

models)>

(3) Remove the field piping from the pressure relief valve

(10 bar). (Photo 11-8)

(4) Remove the pressure relief valve (10 bar) with the flare

joint using 2 spanners: one to hold the flare joint and the

other to turn the flare nut. (Photo 11-9)

(5) Remove the pressure relief valve (10 bar) using 2

spanners: one to hold the flare joint and the other to turn

the pressure relief valve (10 bar). (Photo 11-10)

(6) Eliminate loctite on the thread surfaces using remover.

(Photo 11-10)

•

Before reinstallation, apply loctite over the thread

surface on the pressure relief valve.

•

For more details about the loctite and the remover,

refer to Page 101.

Photo 11-6

Photo 11-5

Photo 11-9

Photo 11-10

Photo 11-7

Air vent

Flare joint

Pressure relief

valve (3 bar)

Flare joint

Threads for application of loctite

From the previous page.

Photo 11-8 (Except for EH*T20*-MHCW models)

Air vent

(automatic)

Pressure relief

valve (3 bar)

Air vent

(automatic)

Pressure relief

valve (3 bar)

Pressure relief

valve (10 bar)

Flare joint

Flare nut

Pressure relief

valve (10 bar)

Flare joint

Threads for application of loctite

Flare joint

Flare nut

Flare joint

Flare nut

Pressure relief

valve (10 bar)

OCH570C

Summary of Contents for EHPT20X-MHCW

Page 1: ...C EHST20C VM6C EHST20C YM9C EHST20C TM9C EHST20C VM2EC EHST20C VM6EC EHST20C YM9EC EHST20C MHCW EHST20C MEC EHST20D VM2C EHST20D VM2EC EHST20D YM9C EHST20D MHCW EHST20D MEC EHST20D MHC Revision Added...

Page 2: ...MHCWR1 UK EHST20C MECR1 UK EHST20D VM2CR1 UK EHST20D VM2ECR1 UK EHST20D YM9CR1 UK EHST20D MHCWR1 UK EHST20D MECR1 UK EHST20D MHCR1 UK EHPT20X VM2CR1 UK EHPT20X VM6CR1 UK EHPT20X YM9CR1 UK EHPT20X TM9...

Page 3: ...BS PUHZ HW140VHA BS PUHZ HW140VHA2 BS PUHZ HW140VHA2R1 BS PUHZ HW140VHA2R2 BS PUHZ HW140VHA2R3 BS PUHZ HW140VHA2R4 BS PUHZ HW140VHA2R5 BS PUHZ SW40 50VHA BS OCH525 PUHZ SW40 50VHAR1 BS PUHZ SW50VKA B...

Page 4: ...ing or servicing the cylinder unit use only the specified refrigerant R410A to charge the refrigerant lines Do not mix it with any other refrigerant and do not allow air to remain in the lines If air...

Page 5: ...use thin pipes Refer to section 4 4 in the installation manual Store the pipes to be used during installation indoors and keep both ends of the pipes sealed until just before brazing Leave elbow join...

Page 6: ...ing should 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 To...

Page 7: ...6 kg 6 6 kg 6 6 kg 6 6 kg 6 6 kg 5 7 kg 5 7 kg 5 7 kg 5 7 kg 5 7 kg Plate heat exchanger MWA2 Plate heat exchanger MWA1 Unvented expansion vessel Primary heating Nominal volume 12 L 12 L 12 L 12 L Cha...

Page 8: ...pec table Cooling See outdoor unit spec table min 10 C 3 DHW tank performance Maximum allowable hot water temperature 4 70 C 4 70 C Time to raise DHW tank temp 15 65 C 5 22 75 min Time to reheat 70 of...

Page 9: ...2 kg 306 kg 314 kg Water volume of heating circuit in the unit 1 6 6 kg 6 6 kg 6 6 kg 6 6 kg 6 6 kg 6 6 kg 6 6 kg 6 6 kg 5 7 kg 5 7 kg 5 7 kg 5 7 kg 5 7 kg Plate heat exchanger MWA2 Plate heat exchang...

Page 10: ...nteed operating range Ambient 2 0 35 C 80 RH Outdoor temperature Heating See outdoor unit spec table Cooling See outdoor unit spec table min 10 C 3 DHW tank performance Maximum allowable hot water tem...

Page 11: ...pump 1 Primary circuit 15 Pump valve 16 DHW tank 17 Plate heat exchanger Water Water 18 Scale trap 19 Water circulation pump Sanitary circuit 20 Immersion heater 21 Temperature and pressure relief val...

Page 12: ...ump Sanitary circuit 20 Immersion heater 21 Temperature and pressure relief valve 22 Pressure relief valve 10bar DHW Tank 23 Drain cock DHW tank 24 Drain cock Sanitary circuit 25 Flow water temp therm...

Page 13: ...ection No plate heat exchanger 28 mm Compression G Refrigerant GAS With plate heat exchanger 12 7 mm Flare E ST20D 15 88 mm Flare E ST20C H Refrigerant LIQUID With plate heat exchanger 6 35 mm Flare E...

Page 14: ...be left for the provision of discharge pipework as detailed in National and Local Building Regulations The cylinder unit must be located indoors and in a frost free environment for example in a utili...

Page 15: ...Return water temp THW5 Thermistor DHW tank water temp THW6 Thermistor Zone1 flow temp Option THW7 Thermistor Zone1 return temp Option THW8 Thermistor Zone2 flow temp Option THW9 Thermistor Zone2 retur...

Page 16: ...on 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...

Page 17: ...temp Option THW9 Thermistor Zone2 return temp Option THWB1 Thermistor Boiler flow temp Option THWB2 Thermistor Boiler return temp Option IN1 Room thermostat 1 Local supply IN2 Flow switch 1 Local supp...

Page 18: ...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...

Page 19: ...be sure to check the outdoor unit electric wiring diagram for service Table 1 Signal Inputs Name Terminal block Connector Item OFF Open ON Short IN1 TBI 1 13 14 Room thermostat 1 input Refer to SW2 1...

Page 20: ...Option THW8 Thermistor Zone2 flow temp Option THW9 Thermistor Zone2 return temp Option THWB1 Thermistor Boiler flow temp Option THWB2 Thermistor Boiler return temp Option IN1 Room thermostat 1 Local s...

Page 21: ...liquid temp THW1 Thermistor Flow water temp THW2 Thermistor Return water temp THW5 Thermistor DHW tank water temp THW6 Thermistor Zone1 flow temp Option THW7 Thermistor Zone1 return temp Option THW8 T...

Page 22: ...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...

Page 23: ...e1 return temp Option THW8 Thermistor Zone2 flow temp Option THW9 Thermistor Zone2 return temp Option THWB1 Thermistor Boiler flow temp Option THWB2 Thermistor Boiler return temp Option IN1 Room therm...

Page 24: ...e reduced 2 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...

Page 25: ...Contactor for booster heater 2 BHCP Contactor for booster heater protection Table 1 Signal Inputs Name Terminal block Connector Item OFF Open ON Short IN1 TBI 1 13 14 Room thermostat 1 input Refer to...

Page 26: ...rn temp Option THW8 Thermistor Zone2 flow temp Option THW9 Thermistor Zone2 return temp Option THWB1 Thermistor Boiler flow temp Option THWB2 Thermistor Boiler return temp Option IN1 Room thermostat 1...

Page 27: ...THWB2 Thermistor Boiler return temp Option IN1 Room thermostat 1 Local supply IN2 Flow switch 1 Local supply IN3 Flow switch 2 Local supply IN4 Demand control Local supply IN5 Outdoor thermostat Local...

Page 28: ...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 S...

Page 29: ...and control Local supply IN5 Outdoor thermostat Local supply IN6 Room thermostat 2 Local supply IN7 Flow switch 3 Local supply IN8 Electric energy meter 1 Local supply IN9 Electric energy meter 2 Loca...

Page 30: ...e2 Refer to SW3 3 in 6 19 DIP switch functions IN8 TBI 3 1 2 Electric energy meter 1 Refer to installation manual IN9 TBI 3 3 4 Electric energy meter 2 IN10 TBI 3 5 6 Heat meter 1 If using outdoor the...

Page 31: ...TBI 3 1 2 Electric energy meter 1 Refer to installation manual IN9 TBI 3 3 4 Electric energy meter 2 IN10 TBI 3 5 6 Heat meter IN1A TBI 3 12 14 CN1A Flow sensor 1 If using outdoor thermostat for contr...

Page 32: ...rol Local supply IN5 Outdoor thermostat Local supply IN6 Room thermostat 2 Local supply IN7 Flow switch 3 Local supply IN8 Electric energy meter 1 Local supply IN9 Electric energy meter 2 Local supply...

Page 33: ...tion Inactive Active OFF Except EH T20 VM2 C ON EH T20 VM2 C SW2 4 Cooling mode function Inactive Active OFF EH T20 M C ON ERST20 M C SW2 5 Automatic switch to backup heat source operation When outdoo...

Page 34: ...4 230 V AC Cylinder unit Outdoor unit S2 S3 4 24 V DC 2 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...

Page 35: ...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 phase conductors of the supply 3 Max...

Page 36: ...ter heater Primary circuit N 230 V 50 Hz 2 kW 16 A 2 2 5 mm 6 kW 32 A 2 6 0 mm Immersion heater DHW tank N 230 V 50 Hz 3 kW 16 A 2 2 5 mm Cylinder unit power supply N 230 V 50 Hz Cylinder unit input c...

Page 37: ...size must comply with the applicable local and national codes 2 Indoor unit outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord Design 60245 IEC 57 Indoor u...

Page 38: ...ay damage the pipework Flare connection Flare connection Cylinder unit Cylinder unit Drain Drain Drain Drain Drain Drain Cold water Cold water DHW DHW Local system Refrigerant pipe Water pipe Local sy...

Page 39: ...Operating pressure Potable side 3 5 bar 3 5 bar 3 5 bar Expansion vessel charge setting pressure Potable side 3 5 bar 3 5 bar 3 5 bar Expansion valve setting pressure Potable side 6 0 bar 6 0 bar 6 0...

Page 40: ...ixing tank local supply 3 Zone1 flow water temp thermistor THW6 4 Zone1 return water temp thermistor THW7 5 Zone1 water circulation pump local supply 6 Zone1 flow switch local supply 7 Motorized mixin...

Page 41: ...lush drain the water contents to remove any residue impurities resulting from the installation works Use the cylinder drain cock to safely discharge the warmed water to drain via a suitable hose 3 On...

Page 42: ...ing 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...

Page 43: ...highlighted icon will appear as a larger version of the center of the screen Press CONFIRM to select and edit the highlighted mode Follow the Main remote controller Menu Tree for further setting usin...

Page 44: ...eating room temp Heating flow temp Heating compensation curve Cooling flow temp Compensation curve preview Compensation curve edit F1 F1 F3 F1 F2 F2 F2 F2 F4 F3 F3 F3 F4 F4 F3 F4 F2 F4 F3 F4 F2 F3 F4...

Page 45: ...nt ON OFF Hybrid settings Ambient Energy price CO2 emission Heat source Schedule Electricity Electricity Heat pump capacity ON OFF Electric heater capacity Demand control IN4 Main controller SD Yes No...

Page 46: ...eration is selected a small timer icon appears in the screen The function selected will only remain in manual operation for a maximum of 2 hours This is to prevent accidental permanent override of the...

Page 47: ...ed at 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...

Page 48: ...ump speed 1 From the Service menu highlight Pump speed 2 Press CONFIRM 3 Press F3 and F4 buttons to select a refrigerant address of which you wish to configure or check the settings and press CONFIRM...

Page 49: ...in the Flow temp range menu 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...

Page 50: ...0kW EHST20D YM9C 3 kW 6 kW 0kW ERST20C MEC 0kW 0kW 0kW ERST20C VM2C 2 kW 0kW 0kW ERST20D MEC 0kW 0kW 0kW ERST20D VM2C 2 kW 0kW 0kW EHPT20X VM2C 2 kW 0kW 0kW EHPT20X VM6C 2 kW 4 kW 0kW EHPT20X YM9C 3...

Page 51: ...outdoor 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...

Page 52: ...on curve FSout Freeze stat function ambient temperature COR CO Cooling flow temperature Error history Error history allows the service engineer to view previous Error codes the unit address and the da...

Page 53: ...te 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 re...

Page 54: ...Accumulated operating time reset 504 Indoor unit Zone1 room temp TH1A 39 88 C 505 Indoor unit Ref liquid temp TH2 39 88 C 506 Indoor unit Return water temp THW2 39 88 C 507 Indoor unit Zone2 room temp...

Page 55: ...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...

Page 56: ...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...

Page 57: ...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...

Page 58: ...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...

Page 59: ...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 t...

Page 60: ...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...

Page 61: ...s now deactivated Emergency operation In emergency operation an operation without connecting outdoor unit and main remote controller is possible When in Emergency operation the main control has NO con...

Page 62: ...mena 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...

Page 63: ...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 actuat...

Page 64: ...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...

Page 65: ...cient 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 existin...

Page 66: ...status of the boiler 5 FTC board failure 5 Replace board LF Flow sensor failure Disconnection or loose connection of flow sensor Check flow sensor cable for damage or loose con nections LH Boiler circ...

Page 67: ...g 1 or 2 breakers depending if the unit is powered indepen dently from the outdoor unit If the E3 E5 code is still displayed the FTC and or the main remote controller circuit board should be replaced...

Page 68: ...er that has 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 control may be flat 1 Chec...

Page 69: ...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...

Page 70: ...on 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 installation manual 5 8 Using SD m...

Page 71: ...ump sanitary circuit speed setting failure 4 Water pump sanitary circuit MUST be set to speed 2 When it set to speed 1 hot water would be mixed with cold water due to circulation 11 Hot or warm water...

Page 72: ...LY PROCEDURE 19 Water discharges from pressure relief valve Primary circuit 1 If continual pressure relief valve could bite foreign objects and the valve seat may be damaged 1 Turn the handle on the p...

Page 73: ...me of Delay set in Economy settings for pump is too short Go to Service menu Auxiliary settings Economy settings for pump Increase the time of Delay in Economy settings for pump 29 The cylinder unit t...

Page 74: ...e menu 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 9 4 Service menu 3 Ex...

Page 75: ...0 0 60 0 70 0 80 0 0 0 5 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 0 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 0 0 5 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 L N M 1 75 Water circulation pump primary circuit c...

Page 76: ...8 11 8 5 Open or Short 4 5 5 6 4 6 52 9 5 8 2 5 Open or Short 3 6 kW heater 230 V 3 phase Terminal Normal Abnormal 1 2 2 3 3 1 35 3 3 9 1 8 Open or Short 4 5 5 6 6 4 17 6 1 9 0 9 Open or Short Earth...

Page 77: ...n water temperature thermistor THWB2 0 10 20 30 40 50 20 10 0 10 20 30 40 50 Temperature Resistance k Thermistor Characteristics Charts Room temperature thermistor TH1 Liquid refrigerant temperature t...

Page 78: ...door ther mostat input IN4 TBI 1 7 8 Demand control input IN3 TBI 1 9 10 Flow switch 2 input IN1 TBI 1 13 14 Room thermo stat input CNBC Signal output for booster heater 230 V AC OUT11 TBO 3 3 4 Signa...

Page 79: ...SASSEMBLY PROCEDURE Check individual illustrations and positions of the parts by referring to the parts catalog Some lead wires and pipes are bundled with bands Cut the bands to undo the fastened pipe...

Page 80: ...nd 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 1 2 Disconnect all the lead wires from the t...

Page 81: ...unit while tilting the control box backward When swinging the control box to the front 2 Remove the 3 screws on the bracket L and R Photo 4 1 3 Disengage the tab on the control box bracket L from the...

Page 82: ...lling the G1 nuts use new G1 gaskets Photos 5 2 and 5 3 Set the water pump in the way that the die stamped arrow facing down and the terminal box facing to the left Pump valve 6 Remove the 2 screws on...

Page 83: ...ailure to do so may cause electric shock or cause the 3 way valve to malfunction Photo 6 2 DISASSEMBLY PROCEDURE 3 way valve motor 3 way valve motor Button A B Nut G1 Nut G1 Gasket G1 Gasket G1 Place...

Page 84: ...ow sensor and the other to turn the nut Photos 7 1 and 7 2 When reinstalling the flow sensor use new O rings Photos 7 1 and 7 2 Photo 7 1 Photo 7 2 Sensor part O ring Lead wire Nut G1 O ring Place to...

Page 85: ...U No 4 BHC2 V EHST20C YM9C EHST20C TM9C EHST20C YM9EC EHPT20X YM9C EHPT20X TM9C EHST20D YM9C No 1 BHC1 U No 2 BHC1 V No 3 BHC1 W No 4 BHC2 U No 5 BHC2 V No 6 BHC2 W EHST20C VM2C EHST20C VM2EC EHST20D...

Page 86: ...ion 6 Remove the pipe W C B H by carefully pulling it to the right Photo 8 2 7 Loosen the 2 G1 nuts and remove the pipe B H D V Photo 8 3 When reinstalling the G1 nuts use new G1 gaskets 8 Detach the...

Page 87: ...mersion heater Photo 9 3 5 Pull out the immersion heater When reinstalling the immersion heater use a new G1 3 4 gasket Note When replacing the immersion heater only skip Step 2 After reinstalling the...

Page 88: ...el Refer to Procedure 1 3 Remove the control box Refer to Procedure 4 4 Remove the DIV frame by cutting the band and removing 2 screws on it Photo 10 1 5 Cut the bands bundling the pipes Photos 10 1 a...

Page 89: ...move the flare nut on booster heater then remove the pipe over B H Photo 10 4 12 Remove the strainer valve the water pump and the pump valve Refer to Procedure 5 13 Remove the nut G1 on the B side of...

Page 90: ...emove the pipe band by removing 2 screws on it and remove the water coil cover by removing the 2 screws on it Photo 10 10 Reuse the pipe band the water coil cover and the removed 4 fixing screws 19 De...

Page 91: ...the 2 screws and remove the manometer cover with the manometer from the front frame L by sliding it upward Photos 11 1 and 11 2 5 Remove the manometer from the manometer cover while pressing on the 2...

Page 92: ...Pressure relief valve 10 bar Except for EH T20 MHCW models 3 Remove the field piping from the pressure relief valve 10 bar Photo 11 8 4 Remove the pressure relief valve 10 bar with the flare joint us...

Page 93: ...oto 13 1 For more details about the loctite and the remover refer to Page 101 12 How to remove the expansion vessel 1 Remove the front panel Refer to Procedure 1 2 Swing the control box to the front R...

Page 94: ...hoto 15 2 16 How to remove the drain cock sanitary circuit 1 Remove the front panel Refer to Procedure 1 DHW tank side 2 Remove the drain cock by detaching the quick connection Photo 16 1 When reinsta...

Page 95: ...ater Drain cock Sanitary circuit Nut G3 4 Gasket G3 4 18 How to remove the water pump sanitary circuit 1 Remove the front panel Refer to Procedure 1 2 Disconnect the CNP4 connector and the earth cable...

Page 96: ...t use a new G3 4 gasket 8 Remove the screw which fixes the S T support Photo 19 3 If there is not enough space to use a screw driver rotate the pipe W P Tank forward with a use of the quick connection...

Page 97: ...amps and bands Photos 20 1 and 20 3 TH2 CN21 cable clamp 2 cable straps coated clamp and 3 bands THW1 THW2 CNW12 cable clamp 2 cable straps coated clamp and 2 bands THW5 CNW5 cable clamp 2 cable strap...

Page 98: ...move the side panel right by removing the 7 screws fixing the side panel right Photo 21 1 4 Remove the side panel left by removing the 8 screws fixing the side panel left 4 screws on the front side an...

Page 99: ...he 2 screws that hold the back panel onto the frame Then pull out the back panel while lifting the top panel Photos 22 1 and 22 2 Note The handles are removed by pushing them up Photo 22 1 Handles Top...

Page 100: ...ring Wipe off if dirt or foreign matters are found on the sealing surface where the O ring touches 3 Apply grease on the O ring using a plastic bag etc Photo 23 4 4 Attach the O ring to the male part...

Page 101: ...sealant on the threads let the seal ant sit 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 product...

Page 102: ...e output wire OUT10 Boiler operation to the input room thermostat input on the boiler 2 4 Install one of the following room temperature thermostats 3 Wireless remote controller option Room temp thermo...

Page 103: ...2 outdoor ambient temp 1 28 35 C 4 35 C Zone2 flow temp 25 60 C 25 C Adjust Zone1 outdoor ambient temp 29 34 C 5 Zone1 flow temp 25 60 C Zone2 outdoor ambient temp 1 29 34 C 5 Zone2 flow temp 1 25 60...

Page 104: ...se step 1 10 C 5 C Increase interval 1 7 days 2 days Flow temp Decrease Temp decrease step 1 10 C 5 C Decrease interval 1 7 days 2 days Energy monitor settings Electric heater capacity Booster heater...

Page 105: ...nd fuse fitted on the electricity supply Controller Frequency Notes 1 Check field settings against factory recommendations 2 Check operation of motorized valves ensure they reseat correctly 3 Check ba...

Page 106: ...Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Issued Sep 2016 No OCH570 REVISED EDITION C Issued Aug 2015 No OCH570 REVISED EDITION B Issued Apr 2015 No OCH570 REVISED EDITION A Published Dec 2014 N...

Page 107: ...tion of Conformity Ecodan FTC5 EHPT20X MHCW EHST20 D C MHCW Cylinder Installation Manual RG79D943H05 Ecodan FTC5 EHPT20X MHCW EHST20 D C MHCW Cylinder Parts Catalogue OCB570D Ecodan FTC5 EHPT20X MHCW...

Page 108: ......

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