Mitsubishi Electric EHPT20X-VM2HA Service Manual Download Page 69

Page: 69 / 76

DISASSEMBLY PROCEDURE

PHOTOS

19. Remove the liquid refrigerant temp. thermistor (TH2)

/ flow water temp. & return water temp. thermistor
(THW1,THW2) / tank water temp. thermistor (THW5B)

(1) Remove the front panel. (Refer to Procedure 1.)

(2) Remove the control box cover. (Refer to Procedure 3.)

(3) Disconnect the following thermistor connectors on the

controller board and release the lead wires from cable

clamps and bands.

• TH2 (TH2) (1 cable clamp, 2 cable straps and 3 bands)

• THW1 (THW12) (1 cable clamp, 2 cable straps and 1 band)

• THW2 (THW12) (1 cable clamp, 2 cable straps and 2 bands)

• THW5B (THW5) (2 cable clamps, 2 cable straps and 4 bands)

(4) Remove the thermistors from the thermistor holders.

Photo 19-1

Photo 19-2

Thermistor <THW1>

Thermistor
<THW>

Thermistor <THW5B>

Thermistor
<TH>

Thermistor
connectors
<TH>
<THW1>
<THW>
<THW3>
<THW5B>

Cable
clamps

Cable straps

Bands

Band

Summary of Contents for EHPT20X-VM2HA

Page 1: ...VICE AND MAINTENANCE 73 July 2011 Note This manual describes only service data of cylinder unit RoHS compliant products have G mark on the spec name plate R410A MAIN CONTROLLER PARTS CATALOG OCB507 Model name EHST20C VM6HA EHST20C YM9HA EHST20C VM6A EHST20C YM9A EHST20C VM6SA EHPT20X VM2HA EHPT20X VM6HA EHPT20X YM9HA EHPT20X VM6A EHPT20X YM9A Service Ref EHST20C VM6HA UK EHST20C YM9HA UK EHST20C V...

Page 2: ...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 BS PUHZ HW140VHA2R1 BS ...

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

Page 4: ...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 correct tools If d...

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: ... 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 of...

Page 7: ...lar thermal Ancillary heating circuit Refrigerant R410A Liquid 9 52 mm 9 52 mm 9 52 mm 9 52 mm 9 52 mm Gas 15 88 mm 15 88 mm 15 88 mm 15 88 mm 15 88 mm Operating ambient condition 0 1 35 C 80 RH Tank performance 2 Time to raise DHW tank temp 15 65 C 23 min Time to reheat 70 of DHW tank to 65 C 20 5 min Electrical data Control board Power supply Phase voltage frequency N 230 V 50 Hz Breaker when po...

Page 8: ...ow switch 16 Drain cock Primary circuit 17 Drain cock DHW tank 18 Plate heat exchanger 19 Manometer A DHW outlet B Cold water inlet E Inlet from space heating F Outlet to space heating J Refrigerant Gas K Refrigerant Liquid Number Component 1 Automatic air vent 2 Pressure relief valve 3 Expansion vessel 4 Main controller 5 Control and electrical box 8 DHW tank 9 3 way valve 10 Water circulation pu...

Page 9: ...ircuit 17 Drain cock DHW tank 19 Manometer A DHW outlet B Cold water inlet E Inlet from space heating F Outlet to space heating G Inlet from heat pump H Outlet to heat pump EHPT20X M HA M A except EHPT20X VM2HA Packaged model system Number Component 1 Automatic air vent 2 Pressure relief valve 3 Expansion vessel 4 Main controller 5 Control and electrical box 7 Immersion heater Only for EHPT20X M H...

Page 10: ...egulations 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 Unit mm Letter Pipe description Connection size type A DHW outlet connection 22 mm Compression B Cold water inlet connection 22 mm Compression C D Solar ancillary heat source connection 22 mm Compression E Space heating return connection 28 mm C...

Page 11: ... See Chapter 6 10 11 6 WIRING DIAGRAM 6 1 EHST20C VM6HA ...

Page 12: ... See Chapter 6 10 12 6 2 EHST20C YM9HA ...

Page 13: ... See Chapter 6 10 13 6 3 EHST20C VM6A EHST20C VM6SA ...

Page 14: ... See Chapter 6 10 14 6 4 EHST20C YM9A ...

Page 15: ... See Chapter 6 10 15 6 5 EHPT20X VM2HA ...

Page 16: ... See Chapter 6 10 16 6 6 EHPT20X VM6HA ...

Page 17: ... See Chapter 6 10 17 6 7 EHPT20X YM9HA ...

Page 18: ... See Chapter 6 10 18 6 8 EHPT20X VM6A ...

Page 19: ... See Chapter 6 10 19 6 9 EHPT20X YM9A ...

Page 20: ... H SW1 5 Booster heater WITHOUT booster heater WITH booster heater ON SW1 6 Booster heater function For heating only For heating and DHW ON SW1 7 Outdoor unit type Split type Packaged type OFF EHS M ON EHP M SW1 8 Wireless remote controller WITHOUT wireless remote con troller WITH wireless remote controller OFF SW2 SW2 1 Room thermostat input IN1 logic change Operation stop at thermostat short Ope...

Page 21: ... unit S1 S2 3 AC230V Cylinder unit 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 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 alway...

Page 22: ... 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 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 ...

Page 23: ... Hz 2 kW E VM2 16 A 1 2 5 mm 6 kW E VM6 32 A 1 6 0 mm Immersion heater DHW tank N 230 V 50 Hz 3kW E VM H 16 A 1 2 5 mm Cylinder unit power supply N 230 V 50 Hz Cylinder unit input capacity Main switch Breaker 1 16 A Wiring Wiring No size mm Cylinder unit power supply 2 Min 1 5 Cylinder unit power supply earth 1 Min 1 5 Cylinder unit Outdoor unit 2 2 Min 0 3 Cylinder unit Outdoor unit earth Circuit...

Page 24: ...ylinder unit Outdoor unit 2 2 Min 0 3 Cylinder unit Outdoor unit earth Circuit rating Cylinder unit L N 3 AC230V Cylinder unit Outdoor unit S1 S2 3 Cylinder unit 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 phase conductors of the supply ...

Page 25: ...25 WATER SYSTEM DIAGRAM 8 EHST20C M HA M A EHST20C VM6SA ...

Page 26: ...26 EHPT20X VM2HA EHPT20X M HA M A ...

Page 27: ...cold water feed to tank 3 Attach a hose to the tank drain cock No 17 on Figure 4 1 to 4 4 The hose should be able to withstand heat as the emptied water could be very hot The hose should drain to a place lower than the tank bottom to encourage siphoning Open a hot water tap to start draining without a vacuum 4 When the tank is drained close drain cock and hot tap 5 Attach hose to booster heater dr...

Page 28: ... will NOT operate Please beware that without these safety functions enabled the water circuit is exposed to risk and may potentially be damaged Main screen icons Icon Description 1 Legionella prevention When this icon is displayed Legionella prevention mode is active 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 a...

Page 29: ... 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 Select Time Zone Service menu Manual operation F...

Page 30: ... of 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 3 1 3 4 5 6 7 8 9 10 11 1 1 3 4 5 Screen 1 of service menu Screen 2...

Page 31: ...lectric heater Heating Press CONFIRM The Electric heater 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 i...

Page 32: ...ot 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 3 4 5 Manual operation menu screen System off prompt screen Function Setting Function Setti...

Page 33: ... fitted provides heating for DHW This operation is only available if BOTH a DHW tank AND immersion heater are present on the system From the Operation setting menu use F1 and F2 buttons to scroll through the list until Simultaneous operation is highlighted Press CONFIRM Simultaneous operation screen is displayed To switch simultaneous operation ON OFF press F1 To alter the temperature at which sim...

Page 34: ...on 2 Press CONFIRM 3 Use the function buttons to enter index code for the component to be viewed See the Table 9 2 1 for component index codes 4 Press CONFIRM Note Refer to outdoor unit service manual for request code 0 to 149 As only four digits can be displayed at one time the software version number is displayed in two halves Enter code 190 to see the first four digits and code 191 to see the l...

Page 35: ...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 36: ...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 37: ... 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 38: ...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 39: ...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 40: ...DHW 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 hist...

Page 41: ...rd 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 T...

Page 42: ...ressing 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 follo...

Page 43: ...ble 10 5 Troubleshooting 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 electrica...

Page 44: ...SEMBLY PROCE DURE DHW Domestic hot water mode Heating Heating mode LP Legionella prevention mode FS Freeze stat OS Operation stop TH1 Room temp thermistor TH2 Liquid refrigerant temp thermistor THW1 Flow water temp thermistor THW2 Return water temp thermistor THW3 Booster heater temp thermistor THW5B Tank water temp thermistor 6 Booster heater relay BHC1 BHC2 BHCP operating fault 6 Electrically te...

Page 45: ...0 Replace board L4 Tank water temperature overheat protection DHW Heating LP FS OS Error code display when THW5B detects a temp 75ºC for 10 consecutive seconds 1 3 way valve actuator fault 1 1 Electrically test to determine fault 2 Operate 3 way valve manually using the main remote controller Refer to Manual operation in 9 2 3 Replace 3 way valve coil 4 Replace 3 way valve Refer to Procedure 6 in ...

Page 46: ... table in section 10 6 Compare FTC3 detected temperature to hand held detector 8 FTC3 board failure 8 Replace board L7 3 way valve failure Valve direction defaults to DHW circuit Heating FS If a and b occur L7 is displayed a No change on THW1 under 1 C for 20 minutes from unit starts operation b THW5B goes up in Heating or FS mode over 1 C for 20 minutes Exception If simultaneous Heating and DHW o...

Page 47: ...e unit is powered independently from the outdoor unit If the E4 code is still displayed the FTC3 and or the main controller circuit board should be replaced 4 Fault with the main controller circuit board 5 Electrical noise causes interference with transmission reception of data for main controller E3 E5 Main controller communication failure Transmission error Error code E3 is displayed if the main...

Page 48: ...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 49: ... is also 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 bl...

Page 50: ...s 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 fault 9 Check plumbing wiring to 3 way valve i Operate 3 way valve manually using the main remote controller Refer to Manual opera...

Page 51: ... check seat and renew if necessary 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 vessel 16 Water discharges from pressure relief valve Sanitary circuit 1 If continual field supplied pressure reducing valve not working 1 Check function of pressure reducing valve and replace ...

Page 52: ...ds 27 7 L min the flow speed will be greater than 1 5 m s which could corrode the pipes No Fault symptom Possible cause Explanation Solution 23 Heating mode has been on standby for a long time does not start operation smoothly Duration is set to excessively short time at Economy setting for pump Go to Service menu Auxiliary setting Economy setting for pump Set Economy setting for pump longer 24 He...

Page 53: ... or Short 4 5 5 6 4 6 52 9 5 8 2 5 Ω Open or Short Earth leakage breaker for heater If a short circuit occurs on the booster heater immersion heater or each power line a short circuit breaker will trip and power source will be blocked Eliminate the causes of short circuit and then turn on the breaker again Relay for heater R S T A1 A2 U V W When the applied voltage is not 230V AC across the termin...

Page 54: ...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 55: ...oster heater1 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 CNIH OUT9 TBO 3 5 6 Signal output for immersion heater 230V AC TH1 TH1 TBI 1 1 2 Thermistor Room tempe...

Page 56: ...ns of the parts by referring to the parts catalog included in this manual Some lead wires and pipes are bundled with bands Cut the bands to undo the fastened pipes and lead wires if necessary When bundling the lead wires and pipes again use new commercially available bands When removing the parts associated with water pipe work drain the cylinder unit as necessary When draining the cylinder unit k...

Page 57: ...ews on each contactor Note To avoid dropping of the contactors hold the contac tors 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 terminal block ...

Page 58: ...t hand side frame Photo 4 1 6 Slightly lift and pull out the control box from the cylinder unit while tilting the control box backward When swinging the control box to the front 3 Remove the 2 screws on the brackets R Photo 4 1 4 Remove the 2 cable straps under the control box Photo 4 1 5 Disengage the 2 control box brackets R from the right hand side frame and pull the control box by lifting the ...

Page 59: ...4 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 Pump valve 5 Remove the pump valves by removing the 1 nuts using two spanners one to hold each valve and the other to turn each 1 nut w When reinstalling the 1 nuts use new 1 gaskets Photo 5 3 w When either of the pump valve handles is stiff remove the individual...

Page 60: ...nuts in the order of the bottom middle and top using two spanners one to hold the 3 way valve and the other to turn each nut Photo 6 2 w When reinstalling the 1 nuts use new 1 gaskets A and B shown represent the bottom and the top directions of the 3 way valve respectively Note Before replacing the motor be sure to power off the cylinder unit Failure to do so may cause electric shock or cause the ...

Page 61: ... stiff remove the handle and turn the vertical stem 90 degree mainly by using a span ner Photo 5 2 6 Remove the flow switch by loosening the nut Photo 7 1 w When reinstalling the flow switch use a new O ring Photo 7 2 Note To ensure the correct functioning of the flow switch check the following when installing it The flow switch paddle is set perpendicularly to the water flow Photos 7 2 The lead w...

Page 62: ...he two screws on the heater stay Lift the booster heater slightly and remove the booster heater from the heater stay Photo 8 4 8 Remove the flare joint from the booster heater Photo 8 3 w When reinstalling the flare joint use a new 3 8 gas ket 9 Remove the drain cock from the booster heater Photo 8 3 w Replace the removed drain cock primary circuit The reused drain cock could cause water leakage 1...

Page 63: ...2 5 Pull out the immersion heater w When reinstalling the immersion heater use a new 1 3 4 gasket Note When replacing the immersion heater only skip Step 2 and cut the band shown Photo 9 3 After reinstalling the back nut with the tab cover onto the tank insert the immersion heater straight into the tank through the back nut in order to provide adequate sealing Failure to do so may cause water leak...

Page 64: ...andle under w When the valve handle is stiff remove the handle and turn the vertical stem 90 degree mainly by using a spanner Photo 5 2 8 Remove the 1 nut at the booster heater side of the flexible hose Photo 10 2 w When reinstalling the 1 nut use a new 1 gasket 9 Remove the 1 nut under the strainer valve Photo 10 2 w When reinstalling the 1 nut use a new 1 gasket 10 Remove the 4 screws fixing the...

Page 65: ... Strainer valve handle Strainer valve handle 11 How to remove the strainer 1 Remove the front panel Refer to Procedure 1 2 Close OFF the 2 strainer valves w When either of the strainer valve handles is stiff remove the individual handles and turn the individual stems 90 degree mainly by using an adjustable spanner Photo 5 2 3 Remove the two 1 nuts using two spanners one to hold the strainer and th...

Page 66: ...flare joint using two spanners the one to hold the flare joint and the other to turn the flare nut under the top panel Photo 12 4 6 Remove the pressure relief valve using two spanners one to hold the adaptor and the other to turn the pressure relief valve Photo 12 5 7 Eliminate locktite on the thread surfaces using remover Photo 12 5 w Before reinstallation apply locktite over the thread surface o...

Page 67: ...gasket 13 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 4 Displace the pipe slightly downward and pull out the expansion vessel 5 Remove the flare joint from the expansion vessel w When reinstalling th...

Page 68: ...the flexible hose Between the plate heat exchanger and the booster heater 1 Remove the plate heat exchanger from the cylinder unit Refer to Procedure 10 2 Remove the flexible hose from the plate heat exchanger by removing the 1 nut Photo 18 2 w When reinstalling the 1 nuts use new 1 gaskets DHW tank side 1 Remove the left hand side panel Refer to Procedure 21 2 Disconnect the flexible hose by turn...

Page 69: ...nectors on the controller board and release the lead wires from cable clamps and bands TH2 TH2 1 cable clamp 2 cable straps and 3 bands THW1 THW12 1 cable clamp 2 cable straps and 1 band THW2 THW12 1 cable clamp 2 cable straps and 2 bands THW5B THW5 2 cable clamps 2 cable straps and 4 bands 4 Remove the thermistors from the thermistor holders Photo 19 1 Photo 19 2 Thermistor THW1 Thermistor THW2 T...

Page 70: ...k on the top panel 4 Remove the 2 screws on the back panel and pull out the back panel while lifting the top panel Note The handles are removed by pushing them up Photo 22 1 Photo 20 1 20 How to remove the booster heater temp thermistor THW3 1 Remove the front panel Refer to Procedure 1 2 Remove the control box cover Refer to Procedure 3 3 Remove the THW3 connector on the controller board Photo 19...

Page 71: ...the products above refer to the appropriate manuals that come with the individual products Table 11 2 PARTS CATALOG Recommended tightening torque Nm 2 Page No Part No Part name 1 3 5 7 9 1 S70 C18 404 PRESSURE RELIEF VALVE 3bar 15 1 11 15 S70 C19 404 TEMPERATURE AND PRESSURE RELIEF VALVE 15 1 11 8 S70 C11 525 STAT POCKET ASSEMBLY 12 1 1 For more details about the listed parts refer to the parts ca...

Page 72: ...e 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 73: ...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 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 Temp display On Off Off Time display hh mm hh mm AM AM hh mm Room sensor setting ...

Page 74: ...ck field settings against factory recommendations 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 heat exchanger fins air inlet for trapped debris damage 2 Check condensate drain provision 3 Ch...

Page 75: ...75 ...

Page 76: ...3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2011 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Jul 2011 No OCH507 Made in Japan New publication effective Jul 2011 Specifications subject to change without notice ...

Search results

Summary of Contents for EHPT20X-VM2HA

Reviews:

Related manuals for EHPT20X-VM2HA

Brands by name

Popular brands

Mitsubishi Electric EHPT20X-VM2HA, Service Manual

Search results

Summary of Contents for EHPT20X-VM2HA

Reviews:

Related manuals for EHPT20X-VM2HA

Brands by name

Popular brands