Daikin 2MXU40GV1B Page 130 Service Manual Download

Page: 130 / 274

Troubleshooting

SiBE12-908

119

Service Diagnosis

Note:

Refer to P. 40 for the priority room setting.

(R9434)

Continued from
the previous
page

Is the set temperature

by remote controller

too high?

Is the outdoor

temperature or

humidity extremely

low?

Not low

Low

High

Explain to the user.

Set the air outlet at the
height of 1.8 m. Confirm the
humidification performance.

Summary of Contents for 2MXU40GV1B

Page 1: ...SiBE12 908 SiBE12 908 Applied Models Inverter Multi Heat Pump Service Manual Inverter Multi System with Humidifying G Series Inverter Multi System with Humidifying G Series ...

Page 2: ...SiBE12 908 i Table of Contents Inverter Multi System with Humidifying G Series zHeat Pump Indoor Unit CTXU25G2V1B CTXU35G2V1B CTXU42G2V1B CTXU50G2V1B Outdoor Unit 2MXU40GV1B 2MXU50GV1B ...

Page 3: ...trol for Indoor Units 20 1 7 HUMID HEAT Operation 21 1 8 Fresh Air Supply Ventilation 26 1 9 2 AREA INTELLIGENT EYE 28 1 10 Inverter POWERFUL Operation 30 1 11 ECONO Mode 31 1 12 NIGHT SET Mode 32 1 13 Other Functions 33 1 14 Table for Special Modes 35 2 Function of Thermistor 37 2 1 Heat Pump Model 37 3 Control Specification 39 3 1 Mode Hierarchy 39 3 2 Automatic switching for HUMID HEAT operatio...

Page 4: ...tion by Remote Controller 107 2 2 Air conditioner does not run 109 2 3 Air conditioner runs but does not cool heat 112 2 4 When operation starts safety breaker works 114 2 5 Air conditioner makes big noise and vibration 116 2 6 Air is not humidified enough 117 2 7 Indoor Unit PCB Abnormality 120 2 8 Freeze up Protection Control or Heating Peak cut Control 121 2 9 Fan Motor DC Motor or Related Abno...

Page 5: ...Check 170 3 4 Outdoor Fan System Check DC Motor 170 3 5 Power Supply Waveform Check 171 3 6 Main Circuit Electrolytic Capacitor Check 171 3 7 Refrigerant System Check 172 3 8 Inverter Checker Check 173 3 9 Power Transistor Check 174 3 10 Discharge Pressure Check 175 3 11 Electronic Expansion Valve Check 176 3 12 Rotating Pulse Input on Outdoor Unit PCB Check 177 3 13 Main Circuit Short Check 179 3...

Page 6: ...val of the Propeller Fan Fan Motor 245 2 12 Removal of Thermistors 248 2 13 Removal of Compressor 250 2 14 Removal of the Four Way Valve Electronic Expansion Valve 252 Part 8 Others 254 1 Others 255 1 1 Trial Operation 255 1 2 Jumper Settings 256 1 3 Application of Silicon Grease to a Power Transistor and a Diode Bridge 257 Part 9 Appendix 258 1 Piping Diagrams 259 1 1 Indoor Units 259 1 2 Outdoor...

Page 7: ...wer cable plug from the plug socket before disassembling the equipment for repair Working on the equipment that is connected to the power supply may cause an electrical shook If it is necessary to supply power to the equipment to conduct the repair or inspecting the circuits do not touch any electrically charged sections of the equipment If the refrigerant gas is discharged during the repair work ...

Page 8: ...ctrical shock Do not clean the air conditioner by splashing water Washing the unit with water may cause an electrical shock Be sure to provide the grounding when repairing the equipment in a humid or wet place to avoid electrical shocks Be sure to turn off the power switch and unplug the power cable when cleaning the equipment The internal fan rotates at a high speed and cause injury Be sure to co...

Page 9: ... heat generation or fire When wiring between the indoor and outdoor units make sure that the terminal cover does not lift off or dismount because of the cable If the cover is not mounted properly the terminal connection section may cause an electrical shock excessive heat generation or fire Do not damage or modify the power cable Damaged or modified power cable may cause an electrical shock or fir...

Page 10: ...vent children from swallowing it If a child swallows the coin battery see a doctor immediately Warning Caution Installation of a leakage breaker is necessary in some cases depending on the conditions of the installation site to prevent electrical shocks Do not install the equipment in a place where there is a possibility of combustible gas leaks If the combustible gas leaks and remains around the ...

Page 11: ...e to install the packing and seal on the installation frame properly If the packing and seal are not installed properly water may enter the room and wet the furniture and floor For unitary type only Caution Icon Type of Information Description Note Note A note provides information that is not indispensable but may nevertheless be valuable to the reader such as tips and tricks Caution Caution A cau...

Page 12: ...SiBE12 908 1 List of Functions Part 1 List of Functions 1 Functions 2 ...

Page 13: ...Speed Worry Free Reliability Durability Auto Restart after Power Failure Indoor Unit Quiet Operation Self Diagnosis Digital LED Display Night Quiet Mode Automatic Wiring Error Check Outdoor Unit Quiet Operation Manual Anticorrosion Treatment of Outdoor Heat Exchanger INTELLIGENT EYE 2 Area INTELLIGENT EYE Flexibility Multi Split Split Type Compatible Indoor Unit Quick Warming Function Hot Start Fu...

Page 14: ...fter Power Failure Comfort Airflow Mode Self Diagnosis Digital LED Display Comfort Control Auto Fan Speed Wiring Error Check Indoor Unit Quiet Operation Anticorrosion Treatment of Outdoor Heat Exchanger Night Quiet Mode Automatic Flexibility Multi Split Split Type Compatible Indoor Unit Outdoor Unit Quiet Operation Manual H P C O Compatible Indoor Unit INTELLIGENT EYE Flexible Voltage Corresponden...

Page 15: ...SiBE12 908 Specifications 4 Part 2 Specifications 1 Specifications 5 1 1 Indoor Units 5 1 2 Outdoor Units 6 ...

Page 16: ...22 39 34 28 25 42 34 26 23 42 36 29 26 Sound Power H dBA 54 55 58 58 Heat Insulation Both Liquid and Gas Pipes Both Liquid and Gas Pipes Piping Connection Liquid mm φ 6 4 φ 6 4 Gas mm φ 9 5 φ 9 5 Drain mm φ18 0 φ18 0 Drawing No 3D063377 3D063378 Model CTXU42G2V1B CTXU50G2V1B Cooling Heating Cooling Heating Rated Capacity 4 2kW Class 5 0kW Class Front Panel Color White White Airflow Rate m min cfm ...

Page 17: ...er Motor Output W 50 Starting Current A 4 6 Dimensions H W D mm 675 765 285 Packaged Dimensions H W D mm 739 907 390 Weight kg 45 Gross Weight kg 49 Operation Sound dBA 47 48 Sound Power dBA 62 Piping Connection Liquid mm φ 6 4 2 Gas mm φ 9 5 2 Drain mm φ18 Heat Insulation Both Liquid Gas Pipes No of Wiring Connection 3 for Power Supply 4 for Interunit Wiring Max Interunit Piping Length m 30 for T...

Page 18: ... W 50 Starting Current A 6 3 Dimensions H W D mm 675 765 285 Packaged Dimensions H W D mm 739 907 390 Weight kg 49 Gross Weight kg 54 Operation Sound dBA 48 50 Sound Power dBA 63 Piping Connection Liquid mm φ 6 4 2 Gas mm φ 9 5 1 φ12 7 1 Drain mm φ18 0 Heat Insulation Both Liquid and Gas Pipes No of Wiring Connection 3 for Power Supply 4 for Interunit Wiring Max Interunit Piping Length m 30 for To...

Page 19: ...iBE12 908 Printed Circuit Board Connector Wiring Diagram 8 Part 3 Printed Circuit Board Connector Wiring Diagram 1 Printed Circuit Board Connector Wiring Diagram 9 1 1 Indoor Units 9 1 2 Outdoor Units 11 ...

Page 20: ...32 Connector for heat exchanger thermistor 5 S41 Connector for swing motor 6 S46 Connector for display PCB 7 S47 Connector for signal receiver PCB 1 S48 Connector for control PCB 1 S49 Connector for control PCB 1 S26 Connector for control PCB 1 V1 Varistor 2 JA Address setting jumper JB Fan speed setting when compressor is OFF on thermostat JC Power failure recovery function auto restart Refer to ...

Page 21: ...uit Board Connector Wiring Diagram 10 PCB Detail PCB 1 Control PCB PCB 4 INTELLIGENT EYE sensor PCB PCB 2 Signal Receiver PCB PCB 3 Display PCB R10337 V1 FU1 LED A S32 S1 S41 S46 S25 S47 JC JA JB S21 R9996 S48 R9997 RTH1 SW1 Humidity sensor S49 LED3 LED2 LED1 3EB86013 S26 ...

Page 22: ...load protector 6 S45 Connector for terminal strip thermal fuse 7 S70 Connector for DC fan motor 8 S72 Connector for humidifying fan motor 9 S80 Connector for four way valve coil 10 S90 Connector for thermistor outdoor air heat exchanger discharge pipe 11 S91 Connector for thermistor gas pipe 12 S92 Connector for thermistor liquid pipe 13 S501 Connector for limit switch 14 HK1 HK2 HK3 Connector for...

Page 23: ...ircuit Board Connector Wiring Diagram Printed Circuit Board Connector Wiring Diagram 12 PCB Detail PCB 1 Control PCB R10338 FU1 FU3 HK1 HK3 FU2 HK2 HH1 HH2 S45 J9 J10 S72 S70 S40 S90 S92 S91 S21 S20 S80 S23 S22 LED A S501 ...

Page 24: ... 32 1 13 Other Functions 33 1 14 Table for Special Modes 35 2 Function of Thermistor 37 2 1 Heat Pump Model 37 3 Control Specification 39 3 1 Mode Hierarchy 39 3 2 Automatic switching for HUMID HEAT operation room 40 3 3 Frequency Control 41 3 4 Controls at Mode Changing Start up 43 3 5 Discharge Pipe Temperature Control 44 3 6 Input Current Control 45 3 7 Freeze up Protection Control 45 3 8 Heati...

Page 25: ... of Inverter The following drawing shows a schematic view of the inverter principle Phase Description 1 The supplied AC power source is converted into the DC power source for the present 2 The DC power source is reconverted into the three phase AC power source with variable frequency When the frequency increases the rotation speed of the compressor increases resulting in an increased refrigerant c...

Page 26: ...l room temperature variation Energy saving heating and cooling Once the set temperature is reached the energy saving operation enables to maintain the room temperature at low power Frequency Limits The following table shows the functions that define the minimum and maximum frequency Forced Cooling Operation For more information refer to Forced operation mode on page 53 R1187 Air discharge temperat...

Page 27: ...rature difference is above the zone C after being in the zone A The system resumes from defrost control in any zones except A The operation turns on in any zones except A The monitoring time has passed while the temperature difference is in the zone B Cooling Dry 10 minutes Heating 10 seconds Cooling Dry Heating R4668 C B A OFF ON Room temperature set point Cooling 0 5 C Dry 0 5 C Cooling 2 0 C Dr...

Page 28: ...8 to 30 C 2 Main unit setting temperature equals remote controller setting temperature 3 Mode switching point are as follows Heating Cooling switching point Room temperature Main unit setting temperature 3 0 deg Cooling Heating switching point Room temperature Main unit setting temperature 2 5 deg Thermostat ON OFF point is the same as the ON OFF point of cooling or heating operation 4 During init...

Page 29: ...room temperature at startup and the temperature set by the microcomputer is divided into two zones Then the unit operates in the dry mode with an appropriate capacity for each zone to maintain the temperature and humidity at a comfortable level Room temperature at startup Set temperature X Thermostat OFF point Y Thermostat ON point Z 24ºC or more Room temperature at startup X 2 5ºC X 0 5ºC or Y 0 ...

Page 30: ...Swing The following table explains the auto swing process for heating cooling dry and fan 3 D Airflow Alternative repetition of vertical and horizontal swing motions enables uniform air conditioning of the entire room This function is effective for starting the air conditioner When the horizontal swing and vertical swing are both set to auto mode the airflow become 3 D airflow and the horizontal s...

Page 31: ... speed Cooling The fan keeps rotating at the set tap Heating The fan stops Dry The fan stops after rotating for a few minutes at LL tap Automatic Airflow Control for Heating On heating mode the indoor fan speed is regulated according to the indoor heat exchanger temperature and the difference between the room temperature and the required set point Automatic Airflow Control for Cooling The followin...

Page 32: ...edy humidification apart from other company s methods which just absorb moisture in the indoor air The room is uniformly humidified Humidifier heating operation by air conditioner Moisture gathers around the ceiling as it is lighter than the air even if the humidifier is operated The air on the floor is kept dry 1 Select HEAT mode 2 Set humidity R9409 2 1 fully humidifying the room R9410 by taking...

Page 33: ...ing operation starts the relative humidity in the room lowers temporarily This phenomenon is caused by the increase of the saturation water vapor Therefore the humidity raises gradually after the temperature reaches the preset temperature In the humidifying operation the operation sound increases by about 2 dB in the indoor unit and 3 dB in the outdoor unit This system does not suppose the storage...

Page 34: ...elative humidity is lowered even if the moisture content is the same e g The rise in the room temperature from 15 C to 25 C results in the fall in humidity from 40 RH to about 22 RH As humidifying operation starts concurrently with heating humidity rises gradually as shown in the figure below Some room conditions floor space ventilation frequency number of residents etc and temperature settings mo...

Page 35: ...er it automatically stops Remark When a room is spacious such as loft style or partitioned by accordion style curtain the ventilation volume is large and may not sometimes reach the set humidity Humidifying time Approx 70min Decide time according to the outdoor temperature and hose length set by remote controller Drying time Approx 2 10min Decide time according to the hose length set by remote con...

Page 36: ...Performance compensation by hose length The max piping length is 15 m but the longer the length of the humidifying hose becomes the less the humidifying performance becomes Applicable hose Hose diameter A KPMH996A10S I D 25mm B KPMH996A15S I D 30mm Hose length setting a 3 0m b 3 1 4 0m c 4 1 6 0m d 6 1 8 0m e 8 1 10 0m f 10 1m R9413 600 500 400 300 200 100 0 10 8 6 4 2 0 2 4 6 8 10 Outdoor tempera...

Page 37: ...xhaust gas is adopted for the thermal catalyst 2 Purifying air in the indoor unit The air supply filter is placed at the humidifying hose outlet of the indoor unit side The air supply filter removes about 97 pollen and dust 3 Controlling temperature The fresh air passed through the air supply filter is cooled or heated in the indoor unit and supplied into the room You can keep comfortable temperat...

Page 38: ...ocated in the outdoor unit Energy saving system due to low heat loss The room temperature changes little because no wind enters Operation noise is heard because the ventilation fan is located in the room Electricity charges are high because heat loss is high Draft enters easily to prevent comfortable temperature from being kept R5979 Supply Ventilation Fresh Air Air Supply Draft Exhaust Ventilatio...

Page 39: ... carries out a sampling every 20 milliseconds and if it detects 10 cycles of the wave in 1 0 second in total corresponding to 20 msec 10 200 msec and when the ON signal continues for 3 seconds it judges that human is in the room as the motion signal is ON INTELLIGENT EYE sensor is divided into 2 areas and detects humans in each area R2821 sampling 20msec Sensor output Detection signal from the sen...

Page 40: ...he airflow direction to area B left side 2 Detection signal ON in area A Shift the airflow direction to area B left side 3 Detection signal ON in area B Shift the airflow direction to area A right side 4 Detection signal OFF in both area A and B No change When the detection signal OFF in both area A and B the unit starts energy saving operation Others The dry operation can not command the setting ...

Page 41: ...f 20 minutes Ex POWERFUL operation in cooling mode Operation mode Fan speed Remote controller set temperature COOL H tap 50 rpm 18 C DRY Dry rotating speed 50 rpm Normally targeted temperature in dry operation Approx 2 C HEAT H tap 50 rpm 30 C FAN H tap 50 rpm AUTO Same as cooling heating in POWERFUL operation The target is kept unchanged R4606 Target temp Set temp 18 C POWERFUL ON POWERFUL OFF Fa...

Page 42: ...ECONO button When this function is ON the maximum capacity is also down Approx 20 This function can only be set when the unit is running Pressing the operation stop button causes the settings to be canceled This function and POWERFUL operation cannot be used at the same time The latest command has the priority Details ECONO mode can be activated while the unit is running The remote controller can ...

Page 43: ...ically raises the temperature setting slightly in the case of cooling or lowers it slightly in the case of heating for economical operations This prevents excessive heating in winter and excessive cooling in summer to ensure comfortable sleeping conditions and also conserves electricity Cooling Operation Heating Operation 0 5 C 1 hour Timer operation Night Set Circuit ON 0 5ºC temperature shift Te...

Page 44: ...de conflict Yellow 1 13 2 WEEKLY TIMER Operation Up to 4 timer settings can be saved for each day of the week up to 28 settings in total Those 3 items of ON OFF temperature and time can be set Refer to WEEKLY TIMER Operation on page 95 for detail 1 13 3 Hot Start Function In order to prevent the cold air blast that normally comes when heating is started the temperature of the heat exchanger of the...

Page 45: ... button on the indoor unit is pressed for 10 seconds or more the forced operation is stopped 1 13 6 Titanium Apatite Photocatalytic Air Purifying Filter This filter combines the Air Purifying Filter and Titanium Apatite Photocatalytic Deodorizing Filter in a single highly effective unit The filter traps microscopic particles decompose odors and even deactivates bacteria and viruses It lasts for 3 ...

Page 46: ...5 sec A Forced operation mode B Easy diagnosis mode Indoor ON OFF Left for 15 min CANCEL 5 sec Left for 60 sec Left for 60 sec Mode selection view Select with TEMP or button MODE TEMP TEMP Service check mode Trial operation mode Pipe set mode Pipe check mode Drying mode Humiditying airflow rate setting mode Monitor brightness setting mode 1 2 3 4 5 6 7 5C T P5 PC H L MODE MODE MODE MODE MODE MODE ...

Page 47: ...h Refer to the installation manual on page 65 for detail 5 Drying mode Hose Dry operation is a forced drying operation for humidifying hose The operation continues for approx 30 minutes Cooling heating or dry operation is not available during Hose Dry operation Refer to the installation manual on page 66 for detail 6 Humidifying airflow rate setting mode Humidifying airflow rate setting mode allow...

Page 48: ...tdoor heat exchanger temperature the discharge pipe thermistor is judged as disconnected 3 The outdoor heat exchanger thermistor is used for high pressure protection during cooling operation B Discharge Pipe Thermistor 1 The discharge pipe thermistor is used for controlling temperature of the discharge pipe If the temperature of discharge pipe used in place of the inner temperature of the compress...

Page 49: ...er then the operation halts 5 The indoor heat exchanger thermistors are used for detecting disconnection of the discharge pipe thermistor when heating When the discharge pipe temperature become lower than the maximum temperature of the indoor heat exchanger temperature the discharge pipe thermistor is judged as disconnected The indoor heat exchanger thermistors are also used for preventing abnorma...

Page 50: ...n this multi system when both 2 indoor units are operating one of them may enter the standby mode by the following conditions The units in the 2 rooms are different in operation mode The indoor units in both 2 rooms are set to HUMID HEAT operation or FRESH AIR SUPPLY VENTILATION Refer to the following pages for detail Note for multi on page 100 HUMID HEAT operation on page 86 FRESH AIR SUPPLY VENT...

Page 51: ... the indoor unit goes into humidifying operation while the indoor unit starting operation subsequently Unit 2 goes into standby mode 2 When the humidity of the Unit 1 reaches a target level the unit which performs HUMID HEAT operation switches from Unit 1 to Unit 2 automatically 3 When the temperature decreases in the room of the Unit 1 the Unit 2 goes into standby mode then the Unit 1 starts HUMI...

Page 52: ...termine upper limit frequency Set a minimum value as an upper limit frequency among the frequency upper limits of the following functions Compressor protection input current discharge pipe temperature low Hz high pressure limit heating peak cut freeze up protection defrost 3 Determine lower limit frequency Set a maximum value as an lower limit frequency among the frequency lower limits of the foll...

Page 53: ...perating frequency is not change more than a certain fixed time adjust the frequency up and down according to the Σ D value When the Σ D value is small lower the frequency When the Σ D value is large increase the frequency 3 Limit of frequency variation width When the difference between input current and input current drooping value is less than 1 A the frequency increase width must be limited 4 F...

Page 54: ... when the heating is stopped the delay switch of the four way valve must be carried out after the operation stopped Detail The OFF delay of four way valve Energize the coil for 150 seconds after unit operation is stopped 3 4 3 Four Way Valve Operation Compensation Outline At the beginning of the operation as the four way valve is switched acquire the differential pressure required for activating t...

Page 55: ...imit is set to keep this temperature from going up further Detail Divide the Zone Management within the Zones 40 class 50 class FCG 1 62 55 FCG 2 72 70 FCG 3 90 85 TCG 1 140 150 TCG 2 180 180 TCG 3 300 300 TCG1 TCG2 TCG3 sec Time Frequency FCG3 FCG2 FCG1 Hz 40 class 50 class A 110 110 B 103 103 C 102 102 D 101 100 E 97 95 Zone Control contents Stop zone When the temperature reaches the stop zone s...

Page 56: ...e outdoor air temperature 1 In case the operation mode is cooling The current droops when outdoor air temperature becomes higher than a certain level model by model 2 In case the operation mode is heating The current droops when outdoor air temperature becomes higher than a certain level model by model 3 7 Freeze up Protection Control Outline During cooling operation the signals being sent from th...

Page 57: ...hen the number of heating rooms decreases 6 Fan control when forced operation 7 Fan control in indoor outdoor unit quiet operation 8 Fan control during heating operation 9 Fan control in the POWERFUL mode 10 Fan control for pressure difference upkeep Detail Fan OFF Control when Stopped Fan OFF delay for 60 seconds must be made when the compressor is stopped Tap Control in Indoor Outdoor Unit Quiet...

Page 58: ...shing Detail Conditions for Starting Defrost The starting conditions must be made with the outdoor air temperature and heat exchanger temperature Under the conditions that the system is in heating operation 6 minutes after the compressor is started and more than 30 minutes of accumulated fine pass since the start of the operation or ending the defrosting Conditions for Canceling Defrost The judgme...

Page 59: ...ports connected and all rooms being air conditioned 2 SC supercooling control Open Control 1 Electronic expansion valve control when starting operation 2 Electronic expansion valve control when frequency changed 3 Electronic expansion valve control for defrosting 4 Electronic expansion valve control for oil recovery 5 Electronic expansion valve control when a discharge pipe temperature is abnormal...

Page 60: ...Control of target discharge pipe temperature Control when the operating room is changed Control of target discharge pipe temperature Pressure equalizing control Open control when starting Control of target discharge pipe temperature Control when the operating room is changed Control of target discharge pipe temperature Defrost control FD 1 Pressure equalizing control Open control when starting Con...

Page 61: ...nsate the electronic expansion valve opening so that the SC of each room becomes the target SC When the actual SC is target SC open the electronic expansion valve of the room When the actual SC is target SC close the electronic expansion valve of the room Detail Start Functioning Conditions After finishing the open control 630 seconds after the beginning of the operation control all the electronic...

Page 62: ...expansion valve and run the refrigerant to the low pressure side and lower discharge pipe temperature 3 12 10 Oil Recovery Function Outline The electronic expansion valve opening in the cooling stopped room must be set as to open for a certain time at a specified interval so that the oil in the cooling stopped room may not be accumulated Detail During cooling operation every 1 hour continuous oper...

Page 63: ...3 13 3 Refrigerant Shortage Control Outline If a power consumption is below the specified value in which the frequency is higher than the specified frequency it must be regarded as refrigerant shortage In addition to such conventional function if the discharge pipe temperature is higher than the target discharge pipe temperature and the electronic expansion valve is fully open more than the specif...

Page 64: ...POWERFUL Operation Mode Compressor operating frequency and outdoor unit airflow rate are increased 3 15 2 Voltage Detection Function Power supply voltage is detected each time equipment operation starts Item Forced Cooling Forced operation allowing conditions 1 The indoor unit is not abnormal but the indoor unit which is not in the freezing prohibiting zone is present in more than 1 room 2 The out...

Page 65: ... Manual 80 3 1 Names of Parts 80 3 2 AUTO DRY COOL HEAT FAN Operation 82 3 3 Adjusting the Airflow Direction 84 3 4 HUMID HEAT Operation 86 3 5 FRESH AIR SUPPLY VENTILATION 88 3 6 COMFORT AIRFLOW and INTELLIGENT EYE Operation 89 3 7 POWERFUL and OUTDOOR UNIT QUIET Operation 91 3 8 ECONO Operation 92 3 9 TIMER Operation 93 3 10 WEEKLY TIMER Operation 95 3 11 Note for Multi System 100 ...

Page 66: ...hermal insulation pipe to an appropriate length and wrap it with tape making sure that no gap is left in the insulation pipe s cut line Wrap the insulation pipe with the finishing tape from bottom to top The mounting plate should be installed on a wall which can support the weight of the indoor unit Mounting plate A Screws Field supply M4 25L Front panel 50mm or more from walls on both sides Air f...

Page 67: ...he front grille 3 In front of the mark of the front grille there are 3 upper hooks Lightly pull the front grille toward you with one hand and push down on the hooks with the fingers of your other hand When there is no work space because the unit is close to ceiling CAUTION Be sure to wear protection gloves Place both hands under the center of the front grille and while pushing up pull it toward yo...

Page 68: ...nnector and pull the harness out through the notched part in the figure 3 Replace the electrical wiring cover as it was and pull the harness around as shown in the figure Removal methods of metal plate electrical wiring covers 1 Remove the front grille 2 Remove the electrical wiring box 1 screw 3 Raise the 2 upper parts of the metal plate electrical wiring cover pull the parts frontward and remove...

Page 69: ...t the chips do not enter the pipe 3 Put the flare nut on the pipe 4 Flare the pipe 5 Check that the flaring is properly made WARNING 1 Do not use mineral oil on flared part 2 Prevent mineral oil from getting into the system as this would reduce the lifetime of the units 3 Never use piping which has been used for previous installations Only use parts which are delivered with the unit 4 Do never ins...

Page 70: ...ve the following 1 Insulation material Polyethylene foam Heat transfer rate 0 041 to 0 052W mK 0 035 to 0 045kcal mh C Refrigerant gas pipe s surface temperature reaches 110 C max Choose heat insulation materials that will withstand this temperature 2 Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below Gas side Liquid side Gas pipe thermal insulation Li...

Page 71: ...lking material to prevent water leakage 1 Bore a feed through hole of 70mm in the wall so it has a down slope toward the outside 2 Insert a wall pipe into the hole 3 Insert a wall cover into wall pipe 4 After completing refrigerant piping wiring and drain piping caulk pipe hole gap with putty 8 Recommended mounting plate retention spots 5 spots in all Place a leveler on raised tab Bilt size M10 Bi...

Page 72: ...nside the wall block the ends of the humidifying hose with tape or the like to prevent water or anything else from entering it until it is connected to the indoor unit and outdoor unit ducts Do not bend the humidifying hose more than 90 Use caution not to deform the cuff while installing the humidifying hose 4 1 Connecting to the indoor unit Connect the cuff side of the humidifying hose to the ind...

Page 73: ...replace the drain plug and drain hose Replacing onto the left side 1 Remove the insulation fixing screws on the right to remove the drain hose 2 Remove the drain plug on the left side and attach it to the right side 3 Insert the drain hose and tighten with the screws which were removed at STEP 1 Drain hose attachment position The drain hose is on the back of the unit 10 Piping bundle diagram Gas p...

Page 74: ...nds until it is firmly caught by the mounting plate hooks Secure indoor unit to the mounting plate with screws M4 12L 5 3 Wall embedded piping Follow the instructions given under 1 Insert the drain hose to this depth so it won t be pulled out of the drain pipe 11 Humidifying hose Drain hose Cut out the piping through hole Refrigerant pipe Refrigerant pipe Refrigerant pipe Cut out the piping throug...

Page 75: ...and pour some water into the drain pan to check the water flows smoothly 3 When drain hose requires extension obtain an extension hose commercially available Be sure to thermally insulate the indoor section of the extension hose 4 When connecting a rigid polyvinyl chloride pipe nominal diameter 13mm directly to the drain hose attached to the indoor unit as with embedded piping work use any commerc...

Page 76: ...d emitted Be sure to check the sound If the sound is not heard press MODE button again 4 Pressing TEMP button changes the humidifying hose length You may set the hose length to 6 levels 5 Hold MODE button for more than 2 seconds The display changes to Pipe check mode 6 Press MODE button again to activate the pipe check mode 7 Press TEMP button and select the hose length Beep sound indicate that th...

Page 77: ...reaker is opened again Trial operation from remote controller 1 Press ON OFF button to turn on the system 2 Press TEMP button 2 locations and MODE button at the same time 3 Press TEMP button and select T TEST mode 4 Press MODE button 5 Trial run mode terminates in approx 30 minutes and switches into normal mode To quit a trial operation press ON OFF button 2 Test items Test items Symptom diagnosti...

Page 78: ...fying hoses respectively in upward direction in ROOM A and in downward direction in ROOM B 3 Front side Back side Allow 300mm of work space below the ceiling surface Wire ROOM A 574 Hole pitch of foot bolts Humidifying hose 250mm from wall ROOM B Stop valve cover 311 Hole pitch of foot bolts Level mounting base available separately If the location does not have good drainage place the unit on a le...

Page 79: ...be careful not to overtighten the nut or the smaller pipe may be damaged about 2 3 1 the normal torque Apply a coat of refrigeration oil to the threaded connection port of the outdoor unit where the flare nut comes in Use an appropriate wrench to avoid damaging the connection thread by overtightening the flare nut Precautions on Installation Check the strength and level of the installation ground ...

Page 80: ...gerant piping the better the performance Connect so that the piping is as short as possible Shortest allowable length per room is 3m 5 Wall facing one side Walls facing two sides More than 50 More than 100 1200 or less Side view More than 50 Top view More than 100 More than 150 More than 50 Walls facing three sides More than 150 More than 300 Top view More than 50 unit mm Indoor Unit Level differe...

Page 81: ...se refrigeration oil for R410A 3 Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand Then tighten them fully with the torque wrenches 6 Drain water hole Bottom frame C Drain plug Hose available commercially inner dia 16mm Apply oil Tighten Do not apply refrigeration o...

Page 82: ...s on the gauge manifold and stop the vacuum pump Leave as is for 4 5 minutes and make sure the coupling meter needle does not go back If it does go back this may indicate the presence of moisture or leaking from connecting parts After inspecting all the connection and loosening then retightening the nuts repeat steps 2 3 4 5 Remove the valve caps on the liquid and gas stop valves at the pipes for ...

Page 83: ... total refrigerant charge on the refrigerant charge label supplied with the product The filled out label must be adhered in the proximity of the product charging port e g onto the inside of the stop valve cover NOTE National implementation of EU regulation on certain fluorinated greenhouse gases may require to provide the appropriate official national language on the unit Therefor an additional mu...

Page 84: ... 2 Prevent mineral oil from getting into the system as this would reduce the lifetime of the units 3 Never use piping which has been used for previous installations Only use parts which are delivered with the unit 4 Do never install a drier to this R410A unit in order to guarantee its lifetime 5 The drying material may dissolve and damage the system 6 Incomplete flaring may cause refrigerant gas l...

Page 85: ...utside temperature is 10 C or lower 1 2 Using the wireless remote controller 1 Select cooling operation and press the ON OFF button The unit will start 2 Press the TEMP button 2 locations and the MODE button at the same time 3 Press the MODE button twice T will be displayed and the unit will go into test run mode 4 Test run mode will end after around 30 minutes and the unit will stop automatically...

Page 86: ...verall length of the humidifying hoses exceeds 10m 1 Be sure to connect one of the 2m hoses provided with a cuff each to the indoor unit and the other one to the outdoor unit Connect the 7 5m hose and 3 5m hose midway to adjust the overall length 11 Humidifying hose Cover Outdoor Indoor Indoor unit Connect the humidifying hose according to the installation manual for the indoor unit Mark the cuff ...

Page 87: ... hose cover Insert the 4 tabs of the cover as shown in the figure 3 Tighten the screw and secure the humidifying hose cover and outdoor unit Connecting through the path above the humidifying hose cover 1 Cut out the knockout hole on the humidifying hose cover 2 Insert the humidifying hose 2m into the knockout hole 3 Insert the humidifying hose into the humidifying duct on the back of the outdoor u...

Page 88: ...ing the connection wires to the terminal board using a single core wire be sure to perform curling Problems with the work may cause heat and fires 3 Pull the wire and make sure that it does not disconnect Then fix the wire in place with a wire retainer 13 Room A Outdoor unit Room B RoomA Indoor unit H05RN To room B If the length of a connection wire is 10m or more use 2 0mm wire Safety breaker Ear...

Page 89: ... the outdoor unit for rooms A and B ATTENTION 1 Have the customer actually operate the unit while looking at the manual included with the indoor unit Instruct the customer how to operate the unit correctly particularly cleaning of the air filters operation procedures and temperature adjustment 2 Even when the air conditioner is not operating it consumes some electric power If the customer is not g...

Page 90: ... a clever method of using it In order to meet this expectation of the users giving sufficient explanations taking enough time can be said to reduce about 80 of the requests for servicing However good the installation work is and however good the functions are the customer may blame either the room air conditioner or its installation work because of improper handling The installation work and handi...

Page 91: ...again to stop it The operation mode refers to the following table This switch is useful when the remote controller is missing 14 Multi monitor lamp page 8 The lamp color changes according to the operation AUTO Blue Red DRY Green COOL Blue HEAT Red FAN White 15 TIMER lamp yellow page 19 16 INTELLIGENT EYE lamp green page 15 17 Signal receiver It receives signals from the remote controller When the ...

Page 92: ...selects the operation mode AUTO DRY COOL HEAT FAN page 8 8 POWERFUL QUIET button POWERFUL and OUTDOOR UNIT QUIET operation page 17 9 ECONO button ECONO operation page 18 10 SWING button Flaps horizontal blades page 10 11 SWING button Louvers vertical blades page 10 12 COMFORT SENSOR button COMFORT AIRFLOW and INTELLIGENT EYE operation page 15 13 WEEKLY button PROGRAM button COPY button BACK button...

Page 93: ...FF button again disappear from the LCD Then OPERATION lamp goes off To change the temperature setting 4 Press TEMPERATURE adjustment button The displayed items on the LCD will change whenever either one of the buttons is pressed 1 5 2 3 4 AUTO DRY COOL HEAT FAN Operation mode Multi monitor lamp AUTO Blue Red DRY Green COOL Blue HEAT Red FAN White HUMID HEAT Orange Yellow page 12 FRESH AIR SUPPLY V...

Page 94: ...e heating capacity In that case the system switches into defrosting operation to take away the frost During defrosting operation hot air does not flow out of indoor unit A pinging sound may be heard during defrosting operation which however does not mean that the air conditioner has failures Note on COOL operation This air conditioner cools the room by blowing the hot air in the room outside so if...

Page 95: ...flaps will begin to swing 2 When the flaps have reached the desired position press SWING button once more The flaps will stop moving disappears from the LCD To adjust the louvers vertical blades 3 Press SWING button is displayed on the LCD 4 When the louvers have reached the desired position press the SWING button once more The louvers will stop moving disappears from the LCD 1 2 3 4 Adjusting the...

Page 96: ...e figure 3 Dimensional 3 D airflow Using 3 dimensional airflow circulates cold air which tends to collected at the bottom of the room and hot air which tends to collect near the ceiling throughout the room preventing areas of cold and hot developing ATTENTION Always use a remote controller to adjust the angles of the flaps and louvers If you attempt to move it forcibly with hand when it is swingin...

Page 97: ... HUMID HEAT operation OFF Refer to FRESH AIR SUPPLY VENTILATION page 14 Red 1Yellow FRESH AIR SUPPLY VENTILATION OFF Red Notes on HUMID HEAT operation The HUMID HEAT operation function is selectable only when the air conditioner is in HEAT operation The operation sound of the air conditioner will rise by slightly while the air conditioner is in humidifying or ventilating operation While the indoor...

Page 98: ... preset condition HUMID HEAT operation in Room A will be switched to the unit in Room B automatically The result is shown in the illustration on the right Thehumidificationof RoomAisfinished and the unit in a standby state in Room B will go into HUMID HEAT operation When the humidity of RoomAdrops the unit in Room A will be switched HUMID HEAT operation and the unit in Room B will be switched HEAT...

Page 99: ... and odor may be captured because the outdoor air is taken into the room The operation noise is slightly louder When the outdoor temperature is higher than room temperature the airflow rate of FRESH AIR SUPPLY VENTILATION will be low Initial state of operation Room A Room B BLUE Not appear The unit not in operation in RoomB will go into ventilation while the unit in Room A is in COOL operation bes...

Page 100: ...ection downward while heating page 16 INTELLIGENT EYE The sensors will detect the movement of people in the sensing areas and the louvers will adjust the airflow direction to an area where people are not present When there are no people in the sensing areas the air conditioner will go into energy saving mode page 16 COMFORT AIRFLOW and INTELLIGENT EYE The air conditioner will be in COMFORT AIRFLOW...

Page 101: ...lled and the indoor unit will not direct the airflow towards the people Sensor detection sensitivity changes according to indoor unit location the speed of passersby temperature range etc The sensor also mistakenly detects pets sunlight fluttering curtains and light reflected off of mirrors as passersby NIGHT SET MODE page 19 will not go on during use of INTELLIGENT EYE operation NOTE To combine C...

Page 102: ...ion in AUTO COOL HEAT or HUMID HEATING mode Note on POWERFUL operation POWERFUL operation cannot be used together with ECONO QUIET or COMFORT operation Priority is given to the function of whichever button is pressed last POWERFUL operation can only be set when the unit is running Pressing the operation stop button causes the settings to be canceled and the disappears from the LCD POWERFUL operati...

Page 103: ...nnecting outdoor unit NOTE 1 2 Running current and power consumption Normal operation ECONO Mode Maximum during normal operation Maximum during ECONO Mode Time From start up until set temperature is reached ECONO operation can only be set when the unit is running Pressing the OFF button causes the setting to be canceled and the disappears from the LCD ECONO operation is a function which enables ef...

Page 104: ...hanges the setting rapidly 3 Press OFF TIMER button again and setting time are displayed on the LCD The TIMER lamp lights up To cancel the OFF TIMER operation 4 Press CANCEL button and setting time disappears from LCD and day of the week are displayed on the LCD The TIMER lamp goes off NOTE 2 4 1 3 When TIMER is set the present time is not displayed Once you set ON OFF TIMER the time setting is ke...

Page 105: ...n changes the setting rapidly 3 Press ON TIMER button again and setting time are displayed on the LCD The TIMER lamp lights up To cancel ON TIMER operation 4 Press CANCEL button and setting time disappears from LCD and day of the week are displayed on the LCD The TIMER lamp goes off To combine ON TIMER and OFF TIMER A sample setting for combining the two timers is shown below ATTENTION 2 4 1 3 Exa...

Page 106: ... settings for example makes it possible to schedule operating mode and set temperature changes Furthermore by using OFF OFF OFF OFF settings only the turn OFF time of each day can be set This will turn OFF the air conditioner automatically if the user forgets to turn it OFF Monday Tuesday to Friday Saturday Sunday Make timer settings up to programs 1 4 page 22 Program 1 Program 2 Program 3 Program...

Page 107: ...nk 4 Press SELECT button to select the desired mode Pressing the SELECT button changes ON or OFF setting in sequence In case the reservation has already been set selecting blank deletes the reservation Go to STEP 9 if blank is selected 5 Press NEXT button The ON OFF TIMER mode will be set and the time blink 6 Press SELECT button to select the desired time The time can be set between 0 00 and 23 50...

Page 108: ...ed for another day of the week Refer to page 24 NOTE 8 10 9 Copy mode Notes on WEEKLY TIMER operation Do not forget to set the time on the remote controller first The day of the week ON OFF TIMER mode time and set temperature only for ON TIMER mode can be set with WEEKLY TIMER Other settings for ON TIMER are based on the settings just before the operation Both WEEKLY TIMER and ON OFF TIMER operati...

Page 109: ...ion will be copied to the selected day of the week To continue copying the settings to other days of the week repeat STEP 4 and STEP 5 6 Press PROGRAM button to complete the setting Exit copy mode is displayed on the LCD and WEEKLY TIMER operation is activated NOTE 2 4 1 6 3 5 Copy mode Monday Program1 Program 2 Program3 Program 4 25 C 27 C 6 00 8 30 17 30 22 00 ON ON OFF OFF Tuesday to Friday Pro...

Page 110: ...rvation deactivated with WEEKLY button is activated once again the last reservation mode will be used To delete reservations Refer to page 22 When selecting desired mode at STEP 4 in setting mode select blank The reservation will be deleted This function can be used for deleting reservations for each day of the week It can be used while confirming or setting reservations 5 Press SELECT button to s...

Page 111: ...door units in both 2 rooms are set to HUMID HEAT operation 1 Priority will be given to the indoor unit in the first selected room and the indoor unit will go into humidifying operation while the indoor unit in the second selected room will go into a humidifying operation standby state The multi monitor indicator will be lit yellow in approx 20 seconds 2 When the humidity of the first selected room...

Page 112: ... 129 2 14 Incomplete Setting for Hose Length 130 2 15 Freeze up Protection in Other Rooms Unspecified Voltage between Indoor and Outdoor Units 131 2 16 Outdoor Unit PCB Abnormality 132 2 17 OL Activation Compressor Overload 133 2 18 Compressor Lock 134 2 19 DC Fan Lock 135 2 20 Input Overcurrent Detection 136 2 21 Discharge Pipe Temperature Control 138 2 22 High Pressure Control in Cooling 139 2 2...

Page 113: ...r Fan System Check DC Motor 170 3 5 Power Supply Waveform Check 171 3 6 Main Circuit Electrolytic Capacitor Check 171 3 7 Refrigerant System Check 172 3 8 Inverter Checker Check 173 3 9 Power Transistor Check 174 3 10 Discharge Pressure Check 175 3 11 Electronic Expansion Valve Check 176 3 12 Rotating Pulse Input on Outdoor Unit PCB Check 177 3 13 Main Circuit Short Check 179 3 14 Four Way Valve P...

Page 114: ...gnal transmission error occurs between the indoor and outdoor units For detailed troubleshooting refer to the following pages Troubleshooting P 107 1 2 Failure Diagnosis by LED Indication The following failure diagnosis can be done by LED indication on the outdoor unit PCB 1 The outdoor unit has a green LED LED A on the PCB Refer to page 11 The flashing green LED indicates in order condition The t...

Page 115: ... below and notifies with a long beep Note 1 A short beep and two consecutive beeps indicate non corresponding codes 2 To cancel the code display hold the timer cancel button down for 5 seconds The code display also cancels itself if the button is not pressed for 1 minute No Code No Code No Code 1 00 13 C7 25 UA 2 U4 14 A3 26 UH 3 L5 15 H8 27 P4 4 E6 16 H9 28 L3 5 H6 17 C9 29 L4 6 H0 18 C4 30 H7 7 ...

Page 116: ...the ten s place blinks 4 Press the TEMP or button and change the figure until you hear the sound of beep or pi pi 5 Diagnose by the sound pi The figure of the ten s place does not accord with the error code pi pi The figure of the ten s place accords with the error code but the one s not beep The both figures of the ten s and one s place accord with the error code See 7 6 Press the MODE button The...

Page 117: ...he ten s place accords with the error code but the one s not beep The both figures of the ten s and one s place accord with the error code See 7 9 Determine the error code The figures indicated when you hear the beep sound are error code Error codes and description Refer to page 107 10 Press the MODE button for 5 seconds to exit from the service check mode When the remote controller is left untouc...

Page 118: ...9 H0 Compressor sensor system abnormality 141 H1 Humidifying unit Damper abnormality 142 H6 Outdoor Position sensor abnormality 143 H8 DC voltage DC current sensor abnormality 145 H9 Outdoor air thermistor abnormality 146 J3 Discharge pipe thermistor abnormality 146 J6 Outdoor heat exchanger thermistor abnormality 146 J8 Liquid pipe thermistor abnormality 146 J9 Gas pipe thermistor abnormality 146...

Page 119: ...eshooting Service Diagnosis 108 UA UH System Freeze up protection in other rooms unspecified voltage between indoor and outdoor units 131 Lights out of microcomputer status lamp 167 Code Unit Description Reference page ...

Page 120: ...wer supply is OFF Improper power supply voltage Improper connection of wire Incorrect combination of indoor unit and outdoor unit Battery shortage of remote controller Invalid address setting Protection device works dirty air filter refrigerant shortage over filling mixed air etc Transmission error between indoor unit and outdoor unit Defective PCB on outdoor unit ...

Page 121: ...ithin 3 minutes after operation stopped Is the wire connection and the wire size correct YES NO NO YES Is the indoor unit compatible with the outdoor unit YES Is there a sound indicating that a signal from the remote controller is received YES Continued to the next page 1 Does the address of the remote controller match with that of the indoor unit YES NO NO NO NO YES NO Power failure NO Is the sup...

Page 122: ...ror code 1 Continued from the previous page YES Is an error code displayed on the remote controller NO NO NO YES Does it operate on test operation mode Diagnose the indoor unit and the outdoor unit by LED Go to troubleshooting Replace the outdoor unit PCB Go to LED diagnosis investigate the symptoms ...

Page 123: ...thod of Malfunction Detection Malfunction Decision Conditions Supposed Causes Incorrect temperature setting Incorrect combination of indoor unit and outdoor unit Blocked air filter Insufficient power Refrigerant piping is too long Improper setting of piping length Defective field piping squeezed etc ...

Page 124: ...et temperature correct NO YES Set the temperature properly Thermostat off NO YES YES NO Is there required installation space Isn t it short circuited Is the indoor unit compatible for connecting with the outdoor unit Check the compatibility Is the air filter blocked YES NO NO Is the load i e size of the room appropriate for the capacity YES Is the refrigerant piping too long Appropriate Is the roo...

Page 125: ...on Malfunction Decision Conditions Supposed Causes Insufficient capacity of safety breaker Earth leakage breaker is too sensitive Not exclusive circuit The supply voltage is not within rated voltage 10 The size of connecting wire is thin indoor power supply unit Air is mixed over filling Damaged outdoor unit PCB short circuit ...

Page 126: ... size of the connecting wire as specified Check No 29 Short circuit check Is it OK YES NO Air is mixed in Overfilling of refrigerant is supposed Check No 29 Short circuit check Remove the fan motors or the four way valve coil and check Is it OK YES NO Replace the safety breaker to a specified one Increase the set value of the earth leakage current on the breaker or replace the breaker Use the excl...

Page 127: ...installation conditions reinforce the wall install outdoor rubber cushion Installation YES Change installation place Put cushion material on the installation plate Does the installation plate vibrate or chatter NO Is the piping secured and fixed Unit YES NO NO NO Does the fan contact with other parts Does the piping contact with the casing Is it passing sound heard from the pressure reducing valve...

Page 128: ...hod of Malfunction Detection Malfunction Decision Conditions Supposed Causes Hose length is not set Incorrect hose length setting Short circuited at outdoor unit Blocked humidification filter Insufficient heat insulation of duct Indoor ventilation is made too often Ceiling is very high ...

Page 129: ... 2 rooms Exceeds It does not match Under specified length Does the each length of humidification hose exceed the specified length Does the set hose length match with the each field hose length It matches Not blocked Is the humidification filter blocked Any breakage or blockage on humidification hose Blocked YES NO NO YES Is the humidificationhose proper Does the outdoor unit suck the exhausted air...

Page 130: ...tting R9434 1 Continued from the previous page Is the set temperature by remote controller too high Is the outdoor temperature or humidity extremely low NO Not low Low High Explain to the user Explain to the user Set the air outlet at the height of 1 8 m Confirm the humidification performance ...

Page 131: ...zero cross detection in approximately 10 continuous seconds Supposed Causes Faulty indoor unit PCB Faulty connector connection Troubleshooting Note Connector Nos vary depending on models R7130 Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Is it normal Connector connection check note NO YES Correct connections Replace PCBs Model Type...

Page 132: ... to the temperature detected by the indoor unit heat exchanger thermistor Malfunction Decision Conditions Heating peak cut control During heating operations the temperature detected by the indoor heat exchanger thermistor is above 65 C Freeze up protection When the indoor unit heat exchanger temperature is below 0 C during cooling operation Supposed Causes Operation halt due to clogged air filter ...

Page 133: ...heck the air passage NO YES Provide sufficient air passage YES Check the intake air filter Is it very dirty Check the dust accumulation on the indoor unit heat exchanger NO NO Is it very dirty Does it conform to the thermistor characteristic chart Indoor unit heat exchanger thermistor check Check No 02 NO YES YES Clean the air filter Clean the heat exchanger Replace the indoor unit PCB Replace the...

Page 134: ...nction Decision Conditions When the detected rotation speed does not reach the demanded rotation speed of the target tap and is less than 50 of the maximum fan motor rotation speed Supposed Causes Operation halt due to short circuit inside the fan motor winding Operation halt due to breaking of wire inside the fan motor Operation halt due to breaking of the fan motor lead wires Operation halt due ...

Page 135: ...ontrol power voltage DC 15V generated Turn off the power supply and disconnect the fan motor connector then turn the power ON again Check the output of the fan motor connector Check No 01 Is the rotation number command voltage DC 1 6V generated Check the output of the fan motor connector Check No 01 Is the rotation number command pulse generated Stop the fan motor Check the output of the fan motor...

Page 136: ...s than 120 Ω or below about 50 C more than 1 860 kΩ Note The values vary slightly in some models Supposed Causes Faulty connector connection Faulty thermistor Faulty PCB Troubleshooting Check No 02 Refer to P 169 C4 Heat exchanger thermistor C9 Room temperature thermistor R9466 Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Is it nor...

Page 137: ...r 0 04 V or less Supposed Causes Improper connector connection Defective indoor control PCB Defective humidity sensor PCB Troubleshooting R9422 Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Is it OK Check the connector for proper connection between the indoor control PCB and display PCB Reconnect properly YES NO Connect the connecto...

Page 138: ...nction Decision Conditions When the data sent from the outdoor unit can not be received without error or when the disable status of signal transmission continues for 15 seconds Supposed Causes Defective outdoor unit PCB Defective indoor unit PCB Signal transmission error between indoor and outdoor unit due to improper wiring Signal transmission error between indoor and outdoor unit due to breakage...

Page 139: ...unction Is the insulation between relay wire and the insulation to the earth properly Properly Does the distance of relay wire exceed 30 m Poor insulation YES NO Check outdoor unit LED A Does it flashing Disconnect No 3 It glows or not Flashing Measure the voltage between 2 and 3 Apply negative terminal to No 2 in DC range Is the measured value 30 to 50 V YES NO below 30 V or above 50 V Voltage 7 ...

Page 140: ... connected to outdoor intake model Supposed Causes Connected to wrong model Mounted improper indoor unit PCB Defective indoor unit PCB Mounted improper outdoor unit PCB or defective PCB Troubleshooting R9436 Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Is the combination of the indoor unit and the outdoor unit correct Check model n...

Page 141: ...tdoor unit PCBs are replaced simultaneously the set value is erased Troubleshooting How to check the preset hose length R9423 Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Has the hose length been set Check the preset hose length with the remote controller Set the hose length with the remote controller YES NO To other UA fault diagn...

Page 142: ...ms Operation halt due to unspecified voltage between indoor and outdoor units Supposed Causes Operation halt due to the freeze up protection in other rooms Wrong connections at the indoor unit PCB wrongly connected Troubleshooting R7151 Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Supply voltage as specified Error displaying air co...

Page 143: ...detected Supposed Causes Out of control of microcomputer caused by external factors z Noise z Momentary fall of voltage z Momentary power loss Defective outdoor unit PCB Breakage of harness between PCBs Troubleshooting R9437 Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Does the LED A blink Power on again Replace the outdoor unit PC...

Page 144: ...oting Check No 02 Refer to P 169 Check No 12 Refer to P 172 Check No 17 Refer to P 176 Check No 31 Refer to P 180 R9438 Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Discharge pipe thermistor disconnected Insert the thermistor in position NO YES Check the thermistors Check No 02 Malfunctioning Discharge pipe thermistor Functioning C...

Page 145: ...439 Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Is it OK Rectify the power supply or replace the outdoor unit PCB NO YES Check the inverter by the inverter checker Check No 02 Turn off the power supply and disconnect U V and W harnesses Turn off the power supply replace the harnesses and restart the compressor after turning on the...

Page 146: ...ed Causes Failure in fan motor Disconnection or improper connection of harness connector between fan motor and PCB The fan does not rotate because it gets caught in foreign matter Troubleshooting Check No 23 Refer to P 177 R9440 Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Try to operate NO YES Check the outdoor unit PCB for rpm co...

Page 147: ...ion Conditions When or more of CT input continues for 2 5 seconds The compressor stops if the error occurs and restarts automatically after 3 minutes standby Supposed Causes Overcurrent due to defective compressor Overcurrent due to defective power transistor Overcurrent due to defective electrolytic capacitor of inverter main circuit Overcurrent due to defective outdoor unit PCB Detection error d...

Page 148: ...onnecting or disconnecting wires to replace part check wiring for proper connection Get restarted and measure the input current NO Check No 11 Main circuit electrolytic capacitor check NO Is it OK Turn off the power supply and disconnect U V and W harnesses Check No 14 Check the inverter by the inverter checker Is LED turned off Turn off the power supply replace the harnesses and restart the compr...

Page 149: ...cur during the following 60 minute compressor running time total time Supposed Causes Refrigerant shortage Faulty operation of four way valve Defective discharge pipe thermistor Defective heat exchanger thermistor or outdoor air thermistor Defective outdoor unit PCB Water mixed in the field piping Defective electronic expansion valve Defective stop valve Troubleshooting Check No 02 Refer to P 169 ...

Page 150: ...rding to the temperature detected by the heat exchanger thermistor Malfunction Decision Conditions Activated when the temperature being sensed by the heat exchanger thermistor rises above 65 C Deactivated when the temperature drops below 53 C Supposed Causes Insufficient installation space Defective outdoor fan Defective electronic expansion valve Defective heat exchanger thermistor Defective outd...

Page 151: ...allation position Clean the heat exchanger Check No 03 Installation condition check NG Check installation space Check No 16 Discharge pressure check NG NG OK OK OK OK OK NG NG Check No 05 Outdoor fan system check Judge Judge Judge Check No 17 Electronic expansion valve check Check No 02 Heat exchanger thermistor check Replace the fan motor Rectify connector and fan motor lead wire Replace the stop...

Page 152: ...is identified by DC current which is detected before compressor startup Malfunction Decision Conditions When the DC voltage is 50 V or less Supposed Causes Defective PCB Harness disconnection defective connection Troubleshooting Replace the outdoor unit PCB Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred ...

Page 153: ...rts Supposed Causes Faulty damper operation due to frost Faulty damper operation due to foreign material Limit switch fault including improper connection Defective motor for damper Troubleshooting R10339 Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Is the damper fixed due to frost YES Heat the damper unit and melt frost Check intak...

Page 154: ...alfunction Decision Conditions When the compressor does not run for 15 seconds after receiving operation start command The unit shuts down if the fault occurs 16 times Clear condition The compressor continuously runs for 11 minutes without fault Supposed Causes Detection error due to disconnection of compressor harness Startup failure due to defective compressor Startup failure due to defective ou...

Page 155: ...ck No 29 Short circuit check NO NO NO YES Is it OK YES YES Check the voltage of electrolytic capacitor DC270 30V YES Is the harness of electric component or compressorconnected properly Turn off the power supply and disconnect U V and W harnesses Check No 14 Check the inverter by the inverter checker Is LED turned off NO Replace Outdoor unit PCB Outdoor fan Humidification fan Four way valve coil R...

Page 156: ...ompressor operation frequency is more than 56 Hz 40 class or 40 Hz 50 class and when the input current is less than 0 25 A Input current is below 0 5 A The unit shuts down when the fault occurs 4 times Fault counter is reset to zero if the unit does not stop during accumulated compressor operation time of 60 minutes after restored from fault conditions Supposed Causes Defective outdoor unit PCB De...

Page 157: ...ions When power is supplied and the thermistor input is 4 98 V or more or when the thermistor input is 0 02 V or less for 5 seconds continuously For J3 Discharge pipe thermistor heat exchanger thermistor is taken into consideration to identify the fault For J8 or J9 although the system of the corresponding room is shut down the outdoor unit can operate Supposed Causes Improper connection of connec...

Page 158: ...Outdoor air thermistor R9446 Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred NO Check No 02 Thermistor resistance check Turn on the power supply again Does the remote controller display the error code again NO NO YES Is it OK YES Check No 02 Thermistor resistance check Is it OK YES Reconnect properly Replace the thermistor Replace the...

Page 159: ...y the fin thermistor with the compressor off Malfunction Decision Conditions With the compressor off the radiation fin temperature is above 80 C The error is cleared when the temperature drops below 70 C Supposed Causes Fin temperature rise due to defective outdoor fan Fin temperature rise due to short circuit Detection error due to defective fin thermistor Detection error due to improper connecti...

Page 160: ... even when the air conditioning is not operated and stops itself when it drops below 70 C YES NO Check No 02 Thermistor resistance check To reset the unit power off status need to continue at least 30 seconds Fin thermistor Check the radiation fin temperature Does the thermistor meet the specification chart of thermistor NO YES Does the temperature exceed the temperature to stop operation NO YES R...

Page 161: ...ation fin temperature is 86 C or more Fault condition is cleared when the radiation fin temperature is below 72 C Shut down when the error occurs repeatedly Clear condition Continuous operation for 60 minutes Supposed Causes Fin temperature rise due to defective outdoor fan Fin temperature rise due to short circuit Detection error due to defective fin thermistor Detection error due to improper con...

Page 162: ...d and stops itself when it drops below 70 C YES NO Check No 02 Thermistor resistance check Outdoor fan system check Check No 05 Has PCB been replaced YES NO Check if the silicon grease applied properly on the radiation fin If not apply it Silicon grease Part No 1172698 Fin thermistor Check the radiation fin temperature Does the thermistor meet the specification chart of thermistor NO Replace the f...

Page 163: ... running The unit shuts down when the signal of output overcurrent is sent repeatedly from the output overcurrent detection circuit to the microcomputer Clear condition The unit continuously runs for about 11 minutes without fault Supposed Causes Overcurrent due to defective power transistor Overcurrent due to wrong internal wiring Overcurrent due to abnormal supply voltage Overcurrent due to defe...

Page 164: ...s for a long term Possible causes Momentary supply voltage drop Compressor motor overloaded Short circuit Open the stop valve fully Repeated YES NO Keep on using as it is monitoring Check connectors and other fittings of electric components Turn off the power supply and disconnect U V and W harnesses Inverter checker Part No 1225477 Check No 15 Check the power transistor Check No 14 Check the inve...

Page 165: ...ions continue for 7 minutes Input current input voltage 2111 256 output frequency 361 W Output frequency 51 Hz 50 class The following conditions continue for 7 minutes Input current input voltage 4628 256 output frequency 608 W Output frequency 48 Hz Refrigerant shortage detection II The following conditions continue for 80 seconds Target opening of the electronic expansion valve 450 pulse Dischar...

Page 166: ...change drift occur Replace with the specified quantity of refrigerant Is refrigerant shortage fault repeated Compressor vibrates too much Check No 02 Thermistor check Replace the outdoor unit PCB Is refrigerant shortage fault repeated Repair flared portion of piping or replace square union Check the power transistor harness for looseness Correct it as required Replace cracked pipe if any Check the...

Page 167: ...ithout fault Supposed Causes Abnormal supply voltage momentary power failure Defective over voltage detector or defective DC voltage detection circuit Failure in PAM controlled parts Short circuit inside the fan motor winding Troubleshooting R9451 Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Check the supply voltage Supply voltage ...

Page 168: ... program of the microcomputer is in bad running order 2 When indoor outdoor unit signal transmission can not be performed for more than 15 seconds 3 When zero cross signal can not be detected for more than 10 seconds Supposed Causes Display disabled due to power supply fault Communication circuit fault in outdoor unit PCB Out of control of microcomputer caused by external factors z Noise z Momenta...

Page 169: ...the fuse Check the varistor on the outdoor unit PCB Is it damaged YES NO NO YES Check the fuse on the outdoor unit PCB Does it have continuity Check the thermal fuse on the terminal board Does it have continuity Check 5V and GND on the outdoor unit PCB YES NO Power on again Wait more than 10 sec 5 V 0 5 V NO YES Continued to the next page 1 Check the terminal board connecting wire for proper conne...

Page 170: ...failure of the outdoor unit PCB Investigate source of noise and take measures YES NO Disturbance Turn off the power supply Disconnect No 3 terminal and turn on the power supply again NO NO YES Does LED A flashing more than 10 times Check relay wire between indoor unit and outdoor unit Check wrong wiring insulation among wiring insulation to ground Is it OK YES Investigate the cause of disturbance ...

Page 171: ...puter mounted on the main body and inverter Malfunction Decision Conditions When the data sent from the microcomputer of the inverter can not be received successively for 9 seconds the unit shuts down Fault counter is reset when the data from the microcomputer of the inverter can be successfully received Supposed Causes Defective outdoor unit PCB Disconnection or breakage of harness between PCBs ...

Page 172: ...o turn off power switch before connect or disconnect connector or parts damage may be occurred Turn off the power and turn it on again Error again YES NO Replace the outdoor unit PCB The cause can be an external factor other than the malfunction Observe the operating condition in long term ...

Page 173: ... rpm within 12 seconds after fan motor start up Supposed Causes Humidifying fan Defective motor Hall IC for humidifying fan Breakage of relay harness or loose connector Detection fault of fan speed due to defective outdoor unit PCB Troubleshooting Check No 23 Refer to P 177 R10340 Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Run th...

Page 174: ...ned on Malfunction Decision Conditions When the temperature detected by the thermistor is lower than the outdoor temperature at heater turned off 5 C and this condition continues for 30 minutes Supposed Causes Breakage of heater filament Breakage of heater harness Abnormal temperature detected by outdoor temperature thermistor Abnormal temperature detected by humidification fan outlet thermistor D...

Page 175: ...eater well cooled Cool it down Measure resistance between heater connectors Is the heater resistance appropriate YES NO YES NO At normal temperature 61 0Ω 3 Is thermal fuse blown NO YES Check No 02 Is a resistance of thermal thermistor at humidification fan outlet appropriate Replace heater ASSY Replace heater ASSY Replace the thermistor For details refer to PH troubleshooting Replace indoor contr...

Page 176: ...n abnormal heater temperature fault Malfunction Decision Conditions When power is supplied and the thermistor input is 4 92 V or more or 0 06 V or less If the humidifying fan outlet temperature is more than 90 C this condition is identified as abnormal heater temperature fault Supposed Causes Short circuit and wire breakage of humidifying thermistor Disconnected connector Heater has a high power T...

Page 177: ...on thermistor is exclusive for fan outlet temperature YES NO YES NO YES NO YES YES NO Check No 02 Thermistor resistance check Measure resistance between heater connectors Is the heater resistance appropriate Turn on the power supply again and run the unit in HUMID HEAT test operation mode Does the humidifying rotor motor run Does the air blow out from the hygroscopic fan Does the air blow out from...

Page 178: ...efore connect or disconnect connector or parts damage may be occurred Is correct power supplied Is LED A turned off Is voltage of 5 V applied between 5V and GND Restart Does the LED A blink For the unit with standby power save function first set the ON timer using remote controller to release the standby power save function NO YES Turn on power supply Turn on breaker NO YES YES YES Do not work on ...

Page 179: ...upply voltage output pins 4 7 3 Check motor control voltage pins 4 3 4 Check rotation command voltage output pins 4 2 5 Check rotation pulse input pins 4 1 R6940 S1 7 6 5 4 3 2 1 Motor power supply voltage Unused Unused P 0V reference potential Motor control voltage 15 VDC Rotation command voltage 1 5 VDC Rotation pulse input Upper fan connector ...

Page 180: ...lationship between normal temperature and resistance is shown in the graph and the table below For the models in which the thermistor is directly mounted on the PCB Thermistor R25 C 20kΩ B 3950 Temperature C 20 211 0 kΩ 15 150 10 116 5 5 88 0 67 2 5 51 9 10 40 15 31 8 20 25 25 20 30 16 35 13 40 10 6 45 8 7 50 7 2 Tester Resistance range R25 20kΩ B 3950 kΩ 150 100 50 15 0 15 30 45 C R3460 RTH1 Test...

Page 181: ...cause an increase of the suction air temperature Is the heat exchanger very dirty Is the airflow blocked by obstacles or winds blowing in the opposite direction Change the position of the air discharge grille or the installation location Clean the heat exchanger Change the installation location or direction Check the outside air temperature temperature of air taken in by the outdoor unit The outsi...

Page 182: ...2 3 6 Main Circuit Electrolytic Capacitor Check Check No 11 Do not touch the live parts within 10 minutes after the breaker is turned off Even after that when you touch the parts check that there is no DC voltage with a tester Check the continuity with a tester It is OK if the tester shows good continuity when pins are replaced Fig 1 Fig 2 R3466 Set the tester to the resistance measuring range If ...

Page 183: ... shortage are to be checked Rectify YES NO Is the temperature of suction pipe of four way valve extremely high Refrigerant leakage check Refer to the refrigerant shortage detection Is the discharge pipe thermistor disconnected from the holder Models with discharge pipe thermistor YES NO Four way valve operation fault replace it Replace the refrigerant ...

Page 184: ...efore carrying out the service work Reference If the connector terminal of compressor is not a FASTON terminal difficult to remove the wire on the terminal it is possible to connect a wire available on site to the unit from output side of PCB Do not connect it to the compressor at the same time otherwise it may result in incorrect detection How to activate inverter test mode 1 Turn the power on 2 ...

Page 185: ...arried out with no load the condition of the compressor is disconnected some of units may stop operation with CT system error due to no electric current or startup failure because the compressor does not turn In this case check if the LED is flashing during operation to malfunction stop Refer to the service manual of each air conditioner for checking whether the alarm LEDs for CT system startup fa...

Page 186: ... No 16 R9683 Discharge pressure check YES NO Is it high NO YES YES NO NO YES Is the stop valve open Is the connection pipe deformed Are the heat exchanger and air filter dirty Replace the compressor Open the stop valve Replace the field piping Clean it Replace the compressor ...

Page 187: ...are EVs which do not sound clatter disconnect the connectors of these EVs and check them for continuity 4 If there is no clatter latching sound on all of the EVs in step 2 the outdoor PCB is defective 5 For EVs for which continuity is established in step 3 connect the coil which sounded clatter to the EV main body which did not sound and make sure the latching sound be heard again If latching soun...

Page 188: ...is applied 1 Set operation OFF and power OFF Remove the connector S72 2 Check that the voltage between the pins 5 8 is 270 VDC 3 Check that the control voltage between the pins 4 5 is 15 VDC 4 Check that the rotation command voltage between the pins 3 5 is 5 VDC 5 Keep operation OFF and power OFF Connect the connector S72 6 Check whether 2 pulses 0 15 V are output at the pins 2 5 when the fan moto...

Page 189: ...lace the PCB For hygroscopic fan motor Check that the connectors HK1 HK2 HK3 for proper connection 1 Check that the power supply voltage is applied between HK1 and HK3 2 If NG in step 1 Defective PCB Replace the PCB When the FU2 is melted check the rotor motor for proper function FU1 SW power supply Hygroscopic fan motor FU2 Outdoor fan motor Humidifying fan motor Four way valve ...

Page 190: ...sistance between pins at both ends of DB1 If the resistance is or less than 1 kΩ the main circuit short terminal of the tester in case of digital terminal terminal of the tester in case of digital terminal Resistance in OK several kΩ several MΩ several kΩ several MΩ Resistance in NG 0 or 0 0 0 or ...

Page 191: ...turn it on again NO YES YES NO Start the heating operation S80 voltage at DC 130 230 V for 3 sec after compressor starts and then at about DC 12 15V after that Fig 1 Disconnect the four way valve coil from the connector and check the continuity Four way valve coil resistance at 300 600 Ω Four way valve coil Cooling dry No continuity Heating Continuity Replace the outdoor unit PCB Replace the four ...

Page 192: ...3 2 1 Removal of Humidifier Unit 213 2 2 Removal of Heater ASSY Humidifying Rotor Moisture Adsorption Element Humidifying Rotor Motor 216 2 3 Removal of Damper Motor 220 2 4 Removal of Limit Switch Humidifying Thermistor 222 2 5 Removal of the Fan valve duct ASSY 225 2 6 Removal of Hygroscopic Fan Rotor Hygroscopic Fan Motor 227 2 7 Removal of Panels and Plates 228 2 8 Removal of Electrical Box 23...

Page 193: ... is performed for about 15 minutes 2 Removing the air filter 1 Hold the right and left projections of the front panel and open the panel to the position where it stops 2 Slightly push up the knob at the center of the air filter and release the hook The air filter is marked for difference between the right and left sides The left filter has the LEFT mark Insert the air filter with the FRONT mark fa...

Page 194: ...rifying filter is not marked for difference between the right and left sides 2 Remove the titanium apatite photocatalytic air purifying filter frame by bending the air filter and unfastening the projections from the air filter frame 3 Remove the titanium apatite photocatalytic air purifying filter from its frame at 5 positions by bending it Step Procedure Points R7904 Air filter Titanium apatite p...

Page 195: ...o that the front side mark comes front Humidifying operation without installing the air supply filter forms condensation inside the panel and it causes water leakage There are 4 hooks for the air supply filter 1 Lift the air supply filter up to take out 2 Undo the upper 2 hooks of the air supply filter and open the frame Step Procedure Points R10281 Air supply filter R10282 Front side mark ...

Page 196: ...embling work Step Procedure Points 1 Removing the front panel 1 Hold the right and left projections of the front panel and open the panel over the position where it stops 2 Slide the left rotary shaft to the right and release it 3 Slide the right rotary shaft to the left and release it 4 Remove the front panel R10283 Front panel R10284 Rotary shaft R7909 Rotary shaft R10285 ...

Page 197: ...g the front panel make sure that the projection is fitted in the guide before closing the panel Caution on Mounting When mounting the front panel fit the right and left rotary shafts one by one into the grooves and fully push them in position R10286 Projection ...

Page 198: ...edure Points 1 Removing the service cover 1 Remove the screw of the service cover Preparation Remove the front panel according to the Removal of Front Panel 2 Pull out the service cover diagonally down in the direction of the arrow 3 The figure shows the appearance of the inside 2 Removing the front grille 1 Remove the screws one each at the right and left R10343 Service cover R10287 R10288 R10289...

Page 199: ... hooks at the top 3 Put your fingers into the front grille and lift the grille up to unfasten the left hook 4 Put your fingers into the front grille and lift the grille up to unfasten the center hook Step Procedure Points R10290 Hooks R10291 Front grille R10292 ...

Page 200: ...s into the grille and lifting it 6 Remove the front grille by tilting the upper part to the front a and lifting and pulling the lower part toward yourself b Caution on Mounting When mounting the front grille make sure that the 3 hooks are fastened as they were Step Procedure Points R8078 R10293 a b ...

Page 201: ...per side and the small horizontal blade to the lower side Do not put them in the wrong place 2 Unfasten the center fixing shaft while bending the horizontal blade slightly There is a key alignment mark at the right side Insert the key first while turning 3 Unfasten the left fixing shaft of the horizontal blade large After key alignment at the right side mount the flap first to the center fixing sh...

Page 202: ...hile bending the fixed part at the center slightly 2 Unfasten the left side 3 Unfasten the key type fixing shaft at the right side 3 Removing the fan guard 1 Unfasten the hooks at the lower part of the fan guard with a flat screwdriver Step Procedure Points R10296 Horizontal blade small R10297 R10298 Key R10299 Fan guard ...

Page 203: ...ng the vertical blade 1 Detach the pivot from the interlock shaft for vertical blades by a flat screwdriver 2 Remove the interlock rod 3 Unfasten the hooks at the shaft mounting part by pressing them with a flat screwdriver Step Procedure Points R10300 R10623 Vertical blade Pivot R10302 R10303 ...

Page 204: ... the upper 2 positions Five vertical blades are united as a set It is impossible to replace only one blade The set of blades is not marked for difference between right and left 5 Remove the vertical blade toward yourself Step Procedure Points R10304 Hooks Vertical blade ...

Page 205: ...p Procedure Points 1 The figure shows the connections of wire harnesses Preparation Remove the front grille according to the Removal of Front Grille 2 Remove the screw of the electric wire retaining plate to remove the plate 3 Remove the screws of the terminal board and disconnect the connecting wires 4 Disconnect the connector of the fan motor S1 R10305 R10306 R10307 Terminal board R10308 S1 ...

Page 206: ...he power supply lead wire 6 Remove the heat exchanger thermistor Use care not to lose the retainer of thermistor 7 Disconnect the earth wire by removing the screw Step Procedure Points R10309 S41 R10310 R10311 Heat exchanger thermistor Retainer of thermistor Retainer of thermistor Heat exchanger thermistor R10312 Earth wire ...

Page 207: ...ew of the electrical box 9 Lift up the electrical box and pull it toward yourself When reassembling make sure to fasten the upper hook at the back of the electrical box Then also fasten the lower hook at the back Step Procedure Points R10313 R10314 Electrical box ...

Page 208: ... the shield plate 1 The figure shows the appearance of the electrical box Preparation Remove the electrical box according to the Removal of Electrical Box 2 Open the shield plate at the top 3 Unfasten the hook at the back of the shield plate 4 Lift up the shield plate to unfasten the hooks lower and remove it R8083 Signal receiver PCB INTELLIGENT EYE PCB R8085 Hook Hook R10619 Shield plate Hook ba...

Page 209: ...board 1 Dismount the terminal board by removing the screw 3 Removing the signal receiver unit 1 Release the 3 hooks 2 Release the hook on the opposite side and lift up the signal receiver unit Step Procedure Points R10315 Terminal board R10316 R10317 Signal receiver unit ...

Page 210: ...ks 2 Disconnect the connector S26 from the INTELLIGENT EYE PCB 5 Removing the signal receiver PCB 1 Remove the signal receiver PCB by opening the hooks at 3 positions 2 Disconnect the connector S48 from the signal receiver PCB Step Procedure Points R8092 INTELLIGENT EYE PCB R8093 S26 R8090 Hook Signal receiver PCB Hook Hook R8091 S48 ...

Page 211: ... the connection of wire harness for the display PCB 2 Remove the display PCB by unfastening the 4 hooks 3 Disconnect the connector S49 from the display PCB 7 Removing the control PCB 1 Unfasten the 2 lower hooks of the control PCB Step Procedure Points R8094 Display PCB R10318 Hooks R10621 S49 LED 3 Green LED 2 Yellow LED 1 Multi color R8097 Hooks Control PCB ...

Page 212: ...free solder PbF is used for the PCB When replacing the PCB use the specific solder and soldering iron S1 To DC fan motor S25 To INTELLIGENT EYE PCB S26 To control PCB S32 To heat exchanger thermistor S41 To swing motor S46 To display PCB S47 To signal receiver S48 To control PCB S49 To control PCB See page 10 for detail Step Procedure Points R8098 R8099 S32 S1 S41 S46 S25 S47 R10620 S48 S49 LED2 Y...

Page 213: ...al of the Front Grille Since inside of the connecting duct has projection hooks shake the hose up and down to remove Rotate in the same direction as when assembling for easy removal When assembling make sure to insert the projection into the fixing hole on the duct unit 1 Detach the humidifying hose from the duct unit 2 Remove the fixing screw for the duct unit 3 Lift the right side to undo the pr...

Page 214: ...open air may be sucked in to generate an over pressure in refrigeration cycle thus resulting in pipe rupture or accidental injury 3 Lift up the indoor unit body slightly and pull out the drain hose In the case of left piping Place a plastic bag under the drain pan to prevent from wetting the floor with remaining drain If the drain hose is embedded in the wall disconnect the drain hose beforehand 4...

Page 215: ...the auxiliary pipe by about 10 20 degrees Caution When dismounting or mounting the heat exchanger be sure to wear gloves or wrap it with cloth before proceeding to the work You may be injured by the fins 3 Remove the 2 screws on the left side of the unit 4 Unfasten the lower hook on the right side of the unit with a flat screwdriver Step Procedure Points R10622 Pip fixing plate R10543 Unbending an...

Page 216: ...ter unfastening the lower hooks hold up the heat exchanger by its right side and lift it up When mounting the heat exchanger make sure that the hook right is fastened 6 Remove the heat exchanger Step Procedure Points R10327 Heat exchanger Hook R10328 ...

Page 217: ...ssembling work Step Procedure Points 1 Removing the swing motor for vertical blade 1 Release the 2 hooks at the bottom Lift the indoor unit by a wooden base 2 Remove the screw behind the drain hose and disconnect the drain hose 3 Remove the screw at the rear and the screws on the left and right side of swing motors R10323 R10329 Drain hose R10330 Swing motors ...

Page 218: ...by a flat screwdriver 5 Remove the swing motor unit 6 Detach the interlock shaft from the swing motor by a flat screw driver 7 Remove the vertical blade interlock by a flat screwdriver Step Procedure Points R10623 Vertical blade Pivot R8126 Swing motor unit R8127 Interlock shaff R10331 Vertical blade interlock ...

Page 219: ...iBE12 908 Indoor Unit Removal Procedure 208 8 Remove the 2 screws 9 Remove the swing motor for vertical blade 10 Disconnect the connector Connector green Step Procedure Points R10332 Screws R10333 R10334 ...

Page 220: ... opposite the horizontal blades do not move smoothly or the noise may be heard Set the motor for the upper blade first connector white Then set the motor for the lower blade connector red Fix the both motors with a screw 1 Remove the screw to remove the swing motors for horizontal blades 2 Disconnect the harnesses from the motors Step Procedure Points R8131 Connector for lower blade red Connector ...

Page 221: ...ies at least 10 minutes before disassembling work Step Procedure Points 1 Removing the drip proof plate Preparation Remove the heat exchanger according to the Removal of Heat Exchanger 1 Dismount the drip proof plate right by removing the 2 screws 2 Release the fan motor wire harness R8112 R8113 Drip proof plate R8114 R8115 ...

Page 222: ...e 2 screws of the fan motor fixing plate 4 Unfasten the hook of the fan motor fixing plate and remove 2 Removing the fan rotor 1 Dislocate the fan rotor by sliding it to the right Step Procedure Points R8116 Fan motor fixing plate R8117 R8118 R8119 Fan rotor ...

Page 223: ...e fan motor approx 5mm Tighten the screw until it stops Then turn the screw in one scroll Move the fan rotor and confirm the fan motor and the fan rotor are installed appropriately Tighten the screw completely if appropriate If not appropriate go back to 3 Press the rubber made bearing with force from outside 4 Remove the bearing Step Procedure Points R8120 Lock screw Fan motor R2808 Side face of ...

Page 224: ...arning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work Step Procedure Points 1 External appearance 2 Removal of the humidifier unit 1 Remove the 4 screws and lift up the top panel to remove R9880 Humidifier unit Air outlet R9881 Air inlet R9882 Top panel ...

Page 225: ... hose cover 3 Take out the humidifying hoses 4 The figure shows the arrangement of the relay harness Be sure to wait 10 minutes or more after turning off the power supply before disconnecting the connectors Step Procedure Points R9883 Hose cover R9884 Humidifying hose R9885 ...

Page 226: ...the power supply before disconnecting the connectors Pull out the connector while pushing up the hook on the bottom side When lifting up the humidifier unit be careful not to pull the relay harnesses forcibly When reassembling the humidifier unit make sure the mounting plate is hooked refer to page 232 and do not forget to connect the relay connectors 7 Remove the 4 screws of the humidifier unit a...

Page 227: ...mbling work Step Procedure Points Internal structure of the humidifier unit Preparation Remove the top panel according to Removal of Humidifier Unit The humidifying rotor is located under the heater ASSY and the duct 1 Removal of the heater ASSY 1 Remove the 4 screws of the duct on adsorption side R9889 Duct adsorption side Heater ASSY Humidifying rotor motor Harness ASSY Limit switch Damper motor...

Page 228: ...2 908 217 Removal Procedure 2 Detach the harness for heater from the groove 3 Remove the duct 4 Release the lead wire for humidifying rotor motor from 2 hooks Step Procedure Points R9891 R9892 Duct adsorption side R9893 ...

Page 229: ...rews to remove the heater ASSY Do not dismount the heater ASSY 2 Removal of the humidifying rotor 1 Detach the lead wire for fan motor from the groove 2 Remove the bell mouth on adsorption side Step Procedure Points R9894 R9898 Fan motor lead wire R9899 Bell mouth ...

Page 230: ...catalyst black is applied on the upper side 3 Removal of the humidifying rotor motor 1 Disconnect the connector for the humidifying rotor motor 2 Remove the 2 screws of the humidifying rotor motor Step Procedure Points R9900 Humidifying rotor R9901 R9902 Humidifying rotor motor Rotor driving part ...

Page 231: ...inutes or more after turning off all power supplies before disassembling work Step Procedure Points 1 Removal of the damper motor Disconnect the connector for the humidifying rotor motor Refer to page 219 1 Disconnect the connector for the damper motor R10348 Harness ASSY Damper motor Humidifying thermistor R0232 ...

Page 232: ...Outdoor Unit SiBE12 908 221 Removal Procedure 2 Remove the 2 screws 3 Remove the damper motor Step Procedure Points R0233 R0234 ...

Page 233: ...f Limit Switch Humidifying Thermistor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work Step Procedure Points 1 Removal of the limit switch 1 Open the hooks R10812 Harness ASSY Limit switch R0235 ...

Page 234: ... 223 Removal Procedure 2 Push up the limit switch with a flat screwdriver 3 Disconnect the terminals 4 Release the harness from the hooks and remove the harness ASSY Step Procedure Points R0236 Limit switch R0237 R0238 R0239 ...

Page 235: ...rmistor When replacing the humidifying thermistor order a seal material together 1 Peel off the seal material 2 Pull out the humidifying thermistor When reassembling put the harness through under the limit switch cover Step Procedure Points R0245 R10548 R10547 Limit switch cover ...

Page 236: ...ing work Step Procedure Points Preparation Remove the heater ASSY and the humidifying rotor The humidifying rotor is located under the heater ASSY and the duct 1 Remove the 7 screws of the fan valve duct ASSY Do not dismantle the fan valve duct ASSY Replace it as a unit R10349 Duct adsorption side Heater ASSY Humidifying rotor motor Harness ASSY Fan valve duct ASSY R0242 Fan valve duct ASSY ...

Page 237: ...r Unit Removal Procedure 226 2 Release the 2 hooks on the right side Release the hooks while bending the right side panel 3 Lift up the fan valve duct ASSY to remove Step Procedure Points R0243 R0244 Fan valve duct ASSY ...

Page 238: ...ng to Removal of Humidifying Rotor 1 Disconnect the connector for fan motor and remove the bell mouth on adsorption side 2 Unscrew the fan fixing nut M6 of the hygroscopic fan rotor ASSY sirocco fan rotor ASSY and remove When reassembling align the mark and D cut of the motor shaft Spanner size 10mm 2 Removal of the hygroscopic fan motor Lift the motor cover first and pull out 1 Remove the 3 screw...

Page 239: ...wer supplies before disassembling work Step Procedure Points 1 External appearance Remove the humidifying unit Do not release the mounting plate at this point 2 Remove the 8 screws to remove the front panel The front panel has 4 hooks The bell mouth can not be removed R9929 R9930 Room A Room B Outdoor air thermistor Liquid side Gas side Room A Room B R9931 ...

Page 240: ... the 4 screws of the discharge grille 4 Release the 4 hooks and remove the discharge grille When reassembling make sure to fit the 4 hooks 5 Remove the 2 screws of the stop valve cover and remove it Step Procedure Points R10345 R9932 R9933 Stop valve cover ...

Page 241: ...SiBE12 908 Outdoor Unit Removal Procedure 230 When reassembling the stop valve cover make sure to fit the 4 hooks Step Procedure Points R9934 ...

Page 242: ...ews on the terminal board The terminal board is united resin formation 1 Remove the 2 grounding screws Remove the 2 screws to remove the wiring fixture Then remove the all screws for the connectors to disconnect the power supply cable and the connecting wires 2 Removal of the electrical box 1 Release the outdoor air thermistor from the holder 2 Lift up the guard net to remove 4 4 P R9935 Room B Ro...

Page 243: ...ate 4 Disconnect the connector for the fan motor S70 5 Release the lead wire for the fan motor from the hooks 6 Disconnect the connector for the gas pipe thermistor S91 and for the liquid pipe thermistor S92 S91 Gas pipe thermistor white S92 Liquid pipe thermistor red Step Procedure Points R9938 Mounting plate R9939 S70 R9940 R9941 S92 S91 ...

Page 244: ...nnect the connectors S20 S21 and S80 S20 white Electronic expansion valve coil for room A S21 red Electronic expansion valve coil for room B S80 Four way valve coil 9 Disconnect the connector for the relay harness of compressor 10 Disconnect the 2 connectors for the reactor Step Procedure Points R9942 S40 R9943 S21 S20 S80 R9944 R9945 ...

Page 245: ...scharge pipe thermistor 12 Disconnect the connector for the thermistor ASSY S90 S90 Thermistor ASSY Outdoor air Heat exchanger Discharge pipe 13 Undo the wire clamp for the thermistor ASSY under the electrical box 14 Cut the clamp Step Procedure Points R9946 Discharge pipe thermistor R10346 Thermistor Discharge pipe Clip Cross section R9947 S90 R7588 Wire clamp R9948 Clamp ...

Page 246: ...the screw on the right side of the electrical box 16 Remove the grounding screws of earth wires 17 Remove the screw in front of the electrical box 18 Lift up the electrical box to remove Step Procedure Points R9949 R9950 Earth wire R9951 R9952 Electrical box ...

Page 247: ...ation Remove the panels plates and electrical box according to the removal procedure The control PCB is adopted upside down The lead free solder PbF is used on PCB When exchange use exclusive solder and soldering gun 1 Remove the screw of the electrical box cover 2 Detach the insulation sheet The trimmed part goes front The terminal board is united with thermal fuse R9955 Electrical box cover R995...

Page 248: ...ure 3 Remove the 2 screws of the terminal boards 4 Release the outdoor air thermistor from the hook 5 Remove the 2 screws and detach the 1 clip to remove the radiation shield plate Step Procedure Points R9958 R9959 R9960 Radiation shield plate ...

Page 249: ...2 908 Outdoor Unit Removal Procedure 238 The clip is push mount type 6 Cut off the clamps at 2 locations and disconnect the wire harnesses Step Procedure Points R9961 Compressor harness Clip Hole R9962 R9963 ...

Page 250: ...ift up the back side slightly and release the hooks of the front When reassembling make sure that the hooks of the electrical box are placed on the PCB 9 Release the lead wires from the hook and remove the terminal boards Step Procedure Points R9964 R9965 R7603 R9966 Terminal board ...

Page 251: ...SiBE12 908 Outdoor Unit Removal Procedure 240 10 Lift up the control PCB to remove Step Procedure Points R9967 R9968 Control PCB ...

Page 252: ...ctor S70 DC Fan motor S72 Humidifying fan motor S80 Four way valve coil S90 Discharge pipe Heat exchanger Outdoor air 12 Remove the 2 screws of the radiation fin thermistor S91 Gas pipe thermistor S92 Liquid pipe thermistor When reassembling be sure to apply silicon grease for encouraging the heat radiation See page 257 for detail Step Procedure Points R9969 S40 S72 S70 S92 S90 S20 S21 S80 S23 S22...

Page 253: ...e electrical box beforehand 1 Remove the 6 screws to remove the right side panel 2 Removal of the partition plate When reassembling make sure to catch the lower hook of the partition plate 1 Remove the 2 screws to remove the partition plate 2 Since there are hooks on the partition plate lift up once and pull out toward yourself to remove it R10350 Right side panel Right side panel R7611 Partition ...

Page 254: ... pull it out 2 Lift up the sound blanket top to remove Since the piping ports are torn easily remove the blanket carefully 3 Lift up the sound blanket inside top to remove The sound blanket inside top is attached only for 40 class Step Procedure Points R7613 Sound blanket outside sleeve R9972 Sound blanket top R9973 R9974 Sound blanket inside top ...

Page 255: ...8 Outdoor Unit Removal Procedure 244 4 Open the sound blanket inside sleeve and pull it out 5 Pull out the sound blanket bottom Step Procedure Points R9975 Sound blanket inside sleeve R9976 Sound blanket bottom ...

Page 256: ...ssembling work Step Procedure Points 1 Removal of the propeller fan Spanner size 10mm 1 Unscrew the washer fitted nut M6 by an open ended spanner to remove the propeller fan When reassembling align mark of the propeller fan with D cut section of the motor shaft 2 Removal of the fan motor 1 Disconnect the connector S70 for the fan motor from the PCB R9977 Propeller fan R9978 R7620 R9979 S70 ...

Page 257: ...e 3 Remove the 1 screw to remove the fan motor fixing plate When reassembling make sure z mark of the fan motor goes down When reassembling fit the 2 lower hooks into the bottom frame 4 Remove out the fan motor fixing plate toward yourself Step Procedure Points R9980 R9981 Fan motor fixing plate R7624 R9982 ...

Page 258: ...f the lead wire 6 Release the fan motor lead wire When reassembling put the lead wire through the back of the motor so as not to be entangled with the propeller fan 7 Remove the 4 screws and 4 rubber vibration isolators to remove the fun motor Step Procedure Points R9983 R7627 R3249 Lead wire Propeller fan R7628 R7629 ...

Page 259: ...p and remove the discharge pipe thermistor 2 Cut off the clamp to pull out the heat exchanger thermistor The clamp is always reserved Be careful not to lose the clips for each thermistor 3 The outdoor air discharge pipe heat exchanger thermistors are united as one assembly 4 The figure shows the arrangement of the assembly of thermistor S90 2 Removal of the liquid gas pipe thermistors 1 Remove the...

Page 260: ...Black Room B Gray S92 Liquid pipe thermistor Room A Black Room B Gray 4 The figure shows the arrangement of the assembly of the liquid gas thermistors When reassembling meet the edge of the thermistor and the clip Step Procedure Points R7634 R7635 Thermistor Liquid Room A Thermistor Gas Room A Thermistor Liquid Room B Thermistor Gas Room B R9987 ...

Page 261: ...Procedure Points 1 Remove the terminal cover Be careful so as not to burn the compressor terminals or the name plate 2 Disconnect the flag shaped terminals 3 Detach the terminals by long nose pliers Undo the hooks by a flat screwdriver to remove the overload protector 4 Detach the overload protector R9988 Terminal cover R7638 Protection bushing for lead wires Yellow V Red U Blue W R7639 R7640 ...

Page 262: ...h were heated up by a gas brazing machine so as not to get burnt your hands Caution From the viewpoint of global environment protection do not discharge the refrigerant gas in the atmosphere Make sure to recover the refrigerant gas with the recovery system Before working make sure that the refrigerant is empty in the circuit Be sure to apply nitrogen replacement when heating up the brazed part 6 H...

Page 263: ...ne so as not to get burnt your hands Caution From the viewpoint of global environment protection do not discharge the refrigerant gas in the atmosphere Make sure to recover the refrigerant gas with the recovery system Detach the four way valve coil and the 2 clamps and then detach the wire harnesses Remove Terminal cover of compressor Four way valve coil Electronic expansion valve coil not to burn...

Page 264: ...nd restore 2 Cut pipes on the main unit by a miniature copper tube cutter in order to make it easy to disconnect Note Do not use a metal saw for cutting pipes by all means because the sawdust come into the circuit The brazed parts are heated after being disconnected To avoid a burn make sure that the compressor is cooled down before removing 4 Provide a protective sheet or a steel plate so that th...

Page 265: ...SiBE12 908 Others 254 Part 8 Others 1 Others 255 1 1 Trial Operation 255 1 2 Jumper Settings 256 1 3 Application of Silicon Grease to a Power Transistor and a Diode Bridge 257 ...

Page 266: ...s operation with the previous mode when the circuit breaker is restored For Heat pump In cooling mode select the lowest programmable temperature in heating mode select the highest programmable temperature Trial operation may be disabled in either mode depending on the room temperature After trial operation is complete set the temperature to a normal level 26 C to 28 C in cooling mode 20 C to 24 C ...

Page 267: ... the control PCB Wireless remote controller 1 Slide the front cover and take it off 2 Cut the address jumper J4 1 2 2 Jumper Setting R8249 R8250 J4 J4 EXIST CUT ADDRESS 1 2 ADDRESS JA JA EXIST CUT ADDRESS 1 2 Jumper On indoor unit PCB Function When connected factory set When cut JC Power failure recovery function Auto restart Unit does not resume operation after recovering from a power failure Tim...

Page 268: ...sistor and the diode bridge Applying the paste should be implemented in accordance with the following instruction Remark There is the possibility of failure with smoke in case of bad heat radiation To completely wipe off the old silicon grease on a heat radiation fin To evenly apply the silicon grease to the whole Do not have any foreign object such as solder or paper waste between the power trans...

Page 269: ...SiBE12 908 Appendix 258 Part 9 Appendix 1 Piping Diagrams 259 1 1 Indoor Units 259 1 2 Outdoor Units 260 2 Wiring Diagrams 261 2 1 Indoor Units 261 2 2 Outdoor Units 262 ...

Page 270: ... 6 4CuT CROSS FLOW FAN M FAN MOTOR 9 5CuT FIELD PIPING 6 4CuT FIELD PIPING 9 5CuT REFRIGERANT FLOW COOLING HEATING HEAT EXCHANGER THERMISTOR ON HEATEXCH 4D058898A INDOOR UNIT 6 4CuT CROSS FLOW FAN M FAN MOTOR 9 5CuT FIELD PIPING 6 4CuT FIELD PIPING 12 7CuT REFRIGERANT FLOW COOLING HEATING HEAT EXCHANGER THERMISTOR ON HEATEXCH ...

Page 271: ...IELD PIPING GAS MUFFLER BRANCH PIPE 9 5CuT 9 5CuT 9 5CuT 9 5CuT 9 5CuT MUFFLER GAS PIPE THERMISTOR GAS LINE STOP VALVE GAS LINE STOP VALVE GAS PIPE THERMISTOR MUFFLER HEATING 3D063309 OUTDOOR UNIT BRANCH PIPE 7 9CuT 7 9CuT HEAT EXCHANGER OUTDOOR TEMPERATURE THERMISTOR 6 4CuT MUFFLER WITH BRANCH 4 8CuT 4 8CuT HEATEXCHANGER THERMISTOR FAN MOTOR 9 5CuT PROPELLER FAN M 9 5CuT FOUR WAY VALVE ON HEATING...

Page 272: ...AN MOTOR M1S M3S SWING MOTOR PCB1 PCB4 PRINTED CIRCUIT BOARD R1T R2T THERMISTOR S1 S49 CONNECTOR S1W OPERATION SWITCH X1M TERMINAL STRIP PROTECTIVE EARTH H1 H2 H3 FG F1U 3 15A V1 RECTIFIER TRANSMISSION CIRCUIT S1 RED BLU BRN ORG WHT M M1F S41 INDOOR M M M M1S M2S M3S R2T S32 S47 t S25 S21 HA PCB2 S48 SIGNAL RECEIVER RED ORG YLW PNK BLU RED ORG YLW PNK BLU RED ORG YLW PNK BLU WIRELESS REMOTE CONTRO...

Page 273: ... BRN BLU RED 6 1 5 1 4 7 S70 S40 WHT ORG BRN BLU RED BLK BLK 1 2 Q1L M1F M2F M 1 M 1 M 3 M1C Z1C N 5 X5A BLU YLW RED BLU YLW RED W V U W V U 3D062655A indoor ROOM A ROOM B 1 2 3 1 2 3 L N POWER SUPPLY X1M 1 2 3 X2M 1 2 3 L N TFU 102 C YLW YLW YLW WHT GRN YLW BLK WHT RED GRN GRN YLW outdoor FIELD WIRING Z2C N 4 BLK GRN E1 S A S B HL1 HN1 FU3 30A E2 SA1 V2 V3 L1 FU1 3 15A S90 1 6 S91 WHT 1 4 4 1 S92...

Page 274: ...er distributor and or retailer 1 Air conditioners should not be installed in areas where corrosive gases such as acid gas or alkaline gas are produced 2 If the outdoor unit is to be installed close to the sea shore direct exposure to the sea breeze should be avoided If you need to install the outdoor unit close to the sea shore contact your local distributor Cautions on product corrosion JMI 0107 ...

Search results

Summary of Contents for 2MXU40GV1B

Reviews:

Related manuals for 2MXU40GV1B

Brands by name

Popular brands

Daikin 2MXU40GV1B, Service Manual

Search results

Summary of Contents for 2MXU40GV1B

Reviews:

Related manuals for 2MXU40GV1B

Brands by name

Popular brands