Mitsubishi Heavy Industries SRK71VNXWZR, Service Manual

Page 1: ...E 4 WAY COMPACT TYPE Twin type FDTC71VNXWPVH DUCT CONNECTED LOW MIDDLE STATIC PRESSURE TYPE Single type FDUM71VNXWVH Twin type FDUM71VNXWPVH DUCT CONNECTED HIGH STATIC PRESSURE TYPE Single type FDU71VNXWVH WALL MOUNTED TYPE Single type SRK71VNXWZR CEILING SUSPENDED TYPE Single type FDE71VNXWVH Twin type FDE71VNXWPVH V Multi System OUTDOOR UNIT INDOOR UNIT FDC71VNX W FDT40VH FDE40VH SERVICE MANUAL ...

Page 2: ... 1 19 PAC SM 332 TABLE OF CONTENTS 1 HYPER INVERTER PACKAGED AIR CONDITIONERS 2 2 V MULTI SYSTEM 147 ...

Page 3: ...EX3A only 37 Motion sensor control RC EX3A only 1 Defrost operation 2 Cooling overload protective control 3 Cooling high pressure control 4 Cooling low outdoor air temperature protective control 5 Heating high pressure control 6 Heating overload protective control 7 Heating low outdoor temperature protective control 8 Compressor overheat protection 9 Current safe 10 Current cut 11 Outdoor unit fai...

Page 4: ...ed after short circuit wire breakage on sensor 133 9 Checking the indoor electrical equipment 133 10 How to make sure of wireless remote control 135 11 Inspection procedure for blown fuse on the indoor unit PCB 135 1 3 ELECTRICAL WIRING 136 1 Indoor units 136 2 Outdoor unit 143 1 4 PIPING SYSTEM 144 ...

Page 5: ...he backlight turns off automatically if there is no operation for certain period of time Lighting period of the backlight lighting can be changed If the backlight is ON setting when the screen is tapped while the backlight is turned off the backlight only is turned on Operations with switches and are excluded USB port USB connector mini B allows connecting to a personal computer For operating meth...

Page 6: ...ent mode Cover AIR CON No button Display the indoor unit number connected to this remote control CHECK button This button is used at servicing TEST button This button is used during test operation Weekly timer display Displays the settings of the weekly timer Operation setting display area Displays setting temperature air flow volume operation mode and oparation message Operation check indicator l...

Page 7: ...d once again it stops operating MODE button Every time this button is pressed displays switch as below AUTO COOL HEAT FAN DRY TEMP button Change the set temperature by pressing or button FAN SPEED button The fan speed is switched in the following order 1 speed 2 speed 3 speed 4 speed AUTO 1 speed U D button Used to determine the up down louver position ON TIMER button Used to set the ON TIMER OFF ...

Page 8: ...cts ON TIMER operation TIMER button This button is used for setting the current time and timer function ACL switch This switch resets the program to default state PROGRAM button This button sets WEEKLY TIMER HI ECO button This button changes the HIGH POWER ECO operation AIR FLOW LEFT RIGHT button This button changes the air flow left right direction SILENT button This button sets the SILENT operat...

Page 9: ...Y TIMER This button selects OFF TIMER operation This button switches the WEEKLY TIMER to ON OFF Child Lock This button cancels the ON timer OFF timer and SLEEP operation 3D AUTO light green Illuminates during 3D AUTO operation TIMER light yellow Illuminates during TIMER operation This button can be used for turning on off the unit when a remote control is not available Remote control signal receiv...

Page 10: ...or temperatures 2 CPU reset Reset CPU from the remote control as follows TOP screen Menu Service setting Service Maintenance Service password The selected screen is displayed The selected screen is displayed Service Maintenance 2 Special settings CPU reset Microcomputers of indoor unit and outdoor unit connected are reset State of restoration after power failure 3 Power failure compensation functi...

Page 11: ... function items are saved in the memory of indoor unit g Weekly timer peak cut timer or silent mode timer settings h Remote control function setting Please check the I U Set clock first on the initializing screen set the timer Other thanA C is connected 4 Alert displays If the following a to c appear check and repair as follows Communication check screen This appears if communications cannot be es...

Page 12: ...state of stop is memorized Although the timer mode is cancelled at the recovery from power failure the setting of weekly timer is changed to the holiday setting for all weekdays b Operation mode c Air flow volume mode d Room temperature setting e Louver auto swing stop However the stop position 4 position is cancelled so that it returns to Position 1 f Remote control function items which have been...

Page 13: ...rformed regardless of the temperature shown at right 3 3 Cooling operation Heating operation Room temperature detected with Thi A deg 59 56 Heating operation stopped cooling Heating OK Indoor heat exchanger temperature C b The following automatic controls are performed other than a above i Cooling or heating operation mode is judged according to the conditions of the Judgment based on Setting temp...

Page 14: ...perature and Outdoor temperature Heating Outdoor air tem perature Operation mode Heating 3 The outdoor air temperature of the above judgment conditions is sampled at every 10 minutes 4 In the range where the above cooling and heating zones are overlapped Forced thermostat OFF Forced thermostat OFF Forced thermostat OFF Room temperature Cooling Room temperature Heating Outdoor air temperature Indoo...

Page 15: ... warm up enabled disabled iv Set ON timer by clock Set the time to start operation The time can be set in the unit of 5 minute This setting can be activated only once or at every time It is allowed also to set simultaneously the indoor temperature operation mode air flow rate and warm up enabled disabled Note 1 It is necessary to set the clock to use this timer v Set OFF timer by clock Set the tim...

Page 16: ...ature sensor Thi R1 or R2 whichever higher detects 25 C or lower the fan is turned OFF and does not operate ii When the heat exchanger temperature sensor Thi R1 or R2 whichever higher detects 25 C or higher the fan operates with the fan control at heating thermostat OFF iii When the heat exchanger temperature sensor Thi R1 or R2 whichever higher detects 35 C or higher the fan operates with the set...

Page 17: ...ote control If the auto swing signal is received from the remote control the auto swing will start from the position before the stop b RC E5 i Louver control 1 Press the LOUVER button to operate the swing louver when the air conditioner is operating SWING is displayed for 3 seconds and then the swing louver moves up and down continuously 2 To fix the swing louver at a position press one time the L...

Page 18: ...at exchanger temperature sensors both Thi R1 and R2 detect 25 C or lower 2 Indoor fan OFF is fixed for 5 minutes After the 5 minutes the indoor fan is operated at ULo for 2 minutes In the meantime the louver is controlled at level 3 After operating at ULo for 2 minutes the indoor fan moves to the state of 1 above 4 If the thermostat is turned ON it moves to the hot start control 5 When the heating...

Page 19: ...the fan on the indoor unit of which the thermostat has been turned OFF is turned OFF The same occurs also when the remote control sensor is effective 9 Filter sign As the operation time Total ON time of ON OFF switch accumulates to 180 hours 1 FILTER CLEANING is displayed on the remote control This is displayed when the unit is in trouble and under the central control regardless of ON OFF Notes 1 ...

Page 20: ...detection switch OFF releases the forced drain pump ON condition Normal state 1 2 Normal state Drain detection switch ON Stop 1 Indoor unit operation mode Control A Control B Compressor ON Compressor OFF Cooling Dry Heating Fan 2 Notes 1 Including the stop from the cooling dehumidifying fan and heating and the anomalous stop 2 Including the Fan operation according to the mismatch of operation mode...

Page 21: ...peed If it enters the frost prevention control during cooling operation excluding dehumidifying the indoor fan speed is switched i When the indoor return air detection temperature detected with Thi A is C C or higher and the indoor heat exchanger temperature detected with Thi R detects the compressor frequency drop start temperature A C 1 C indoor fan speed is increased by 20min 1 ii If the phenom...

Page 22: ...ve function operates that unit stops with the anomalous stop but any other normal units continue to run as they are e Signal wiring procedure Signal wiring between indoor and outdoor units should be made on each unit same as the normal wiring For the group control connect the remote control wiring to each indoor unit via terminal block for the remote control Connect the remote control wiring separ...

Page 23: ...T CnT CnTA CnT CnT CnTA CnT CnTA Operation stop pulse CnT CnT CnT CnTA CnT CnT CnTA CnT CnTA Operationpermission prohibitionlevel CnT CnTA CnT CnTA CnT CnTA CnT CnT CnTA CnT CnTA Operation permission prohibition pulse CnT CnT CnT CnTA CnT CnT CnTA CnT CnTA Cooling heating selection level CnT CnTA CnT CnTA CnT CnTA CnT CnTA CnT CnT Cooling heating selection pulse CnT CnTA CnT CnTA CnT CnTA CnT CnTA...

Page 24: ...F Unit goes thermo off 7 Temporary stop Refer to 22 Temporary stop input 8 Silent mode Outdoor unit silent mode is activated ii In case of Pulse input setting Local setting It is effective only when the input signal to CnT 6 or CnTA is changed OFF ON and at that time unit operation ON OFF is inverted ON ON OFF OFF OFF ON ON ON ON Remote control OFF Remote control ON Remote control OFF Remote contr...

Page 25: ... OFF Operation Stop Operation permission 1 Operation prohibition Unit stops 1 Only the LEVEL INPUT is acceptable for external input however when the indoor function setting of Level input Factory default or Pulse input is selected by the function for External input of the wired remote control operation status will be changed as follows In case of Level input setting In case of Pulse input setting ...

Page 26: ...operation Remote control CnT Operation stop pulse CnTA Operation permission prohibition level Operation permission prohibition zone Actual operation Remote control Remote control ON Remote control OFF Remote control ON Remote control ON Remote control OFF Remote control ON ON ON ON ON ON ON ON OFF OFF OFF OFF OFF OFF OFF ON ON OFF ON ON ON ON ON OFF OFF OFF OFF OFF OFF Operation Operation Operatio...

Page 27: ...es are inverted Cooling Heating or Heating Cooling d If the cooling heating selection signal is given by the external input the operation mode is transmitted to the remote control Selection of cooling heating external input function External input selection External input selection Cooling heating selection External input method Level External terminal input CnT or CnTA Cooling heating Cooling hea...

Page 28: ...perature by the return air temperature sensor and the measured temperature after installing the unit a It is adjustable in the unit of 0 5 C with the wired remote control indoor unit function RETURN AIR TEMP 1 0 C 1 5 C 2 0 C 1 0 C 1 5 C 2 0 C b Compensated temperature is transmitted to the remote control and the compressor to control them Note 1 The detection temperature compensation is effective...

Page 29: ...ly from the return air temperature According to temperature difference between set temperature and return air temperature indoor fan tap are controlled automalically Auto 1 Changes the indoor fan tap within the range of Hi Me Lo Auto 2 Changes the indoor fan tap within the range of P Hi Hi Me Lo 35 Indoor unit overload alarm RC EX3A only If the following condition is satisfied at 30 minutes after ...

Page 30: ... of main IU IU back up function Infrared sensor setting Previous Back Select the item Infrared motion sensor setting Select the item Infrared sensor setting Disable Enable Back Menu Direction Cooling 16 14 Mon F1 High power F2 Energy saving Timer Now stopping Set temp TOP screen Menu Energy saving setting or Motion sensor control Infrared sensor control Set button The Infrared sensor control scree...

Page 31: ...hours unit stops Compressor keeps stopped regardless of the set temperature Notes 1 When the following operations are set power saving control will be canceled Energy saving Home leave mode Warm up control Cooling operation check When the operation mode is changed DRY or FAN 2 Not operable while the air conditioner is OFF Low When the extent of human activity is low High When the extent of human a...

Page 32: ...er b ࠉSetting an indoor unit i Turn off the power source and turn it on after 1 minute ii Point the wireless remote control that was set according to the procedure described on the left side at the indoor unit and send a signal by pressing the ACL switch on the wireless remote control Since the signal is sent in about 6 seconds after theACL switch is pressed point the wireless remote control at th...

Page 33: ...start from the set time d When the following operation are set HIGH POWER operation will be canceled When the HI ECO button is pressed again The operation mode will be changed to the ECONOMY operation When the operation mode is changed When it has been 15 minutes since HIGH POWER operation has started When the 3D AUTO botton is pressed When the SILENT botton is pressed When the NIGHT SETBACK botto...

Page 34: ...peration at the next time the air conditioner runs in the following cases When the air conditioner is stopped by ON OFF button during ECONOMY operation When the air conditioner is stopped in SLEEP or OFF TIMER operation during ECONOMY operation When the operation is retrieved from CLEAN or ALLERGEN CLEAR operation b When the following operation are set ECONOMY operation will be canceled When the H...

Page 35: ... cooling and heating i ii Cooling Air flow selection Operation mode AUTO Heating Indoor temp Setting temp 5 C Indoor temp Setting temp 5 C Setting temp Indoor temp 5 C Setting temp Indoor temp 5 C HIGH POWER AUTO HI HI MED MED ULO ULO LO LO HIGH POWER AUTO Flap Louver Cooling Up down swing Heating Wide Fixed Center Fixed Flap Louver Cooling Heating Left right swing Horizontal blowing Fixed Slant f...

Page 36: ...al blowing Fixed 3 4 5 4 b During dehumidifying operation Including auto dehumidifying operation b Sleep timer operation 9 Timer operation a Comfortable timer setting ON timer c OFF timer operation 11 Installation location setting a Setting i If the air conditioning unit is running press the ON OFF button to stop ii Press the AIR FLOW U D UP DOWN button and the AIR FLOW L R LEFT RIGHT button toget...

Page 37: ... the AIR FLOW U D UP DOWN button and the AIR FLOW L R LEFT RIGHT button together for 5 seconds or more iii Setting the air conditioning installation location iv Press the ON OFF button Air flow range Air flow range Air flow range Left end installation Center installation Right end installation Center installation L R L R Right end installation Left end installation wireless b Sleep timer operation...

Page 38: ... Fuzzy operation ON OFF OFF OFF OFF OFF ON OFF few minutes ON OFF few minutes ON ON ON OFF Thermostat ON Thermostat OFF Failure Cooling Compressor Indoor fan motor Outdoor fan motor 4 way valve 12 120rps 12 120rps 12 100rps 12 76rps SRK71ZR W Model Fan speed AUTO MED HI LO 12 50rps ULO 15 ࠉOutline of automatic operation a Determination of operation mode Heating Dehumidifying Cooling Indoor air tem...

Page 39: ...etting temperature and the indoor air temperature When the operation mode has been judged following the change of setting temperature with the remote control the hourly judgment of operation mode is cancelled 16 Protection control function a Dew prevention control Cooling Prevents dewing on the indoor unit i Operating conditions When the following conditions have been satisfied for more than 30 mi...

Page 40: ...n this control has continued for more than 30 minutes continuously the following wind direction control is performed a When the vertical wind direction is set at other than the vertical swing the flaps change to the horizontal position b When the horizontal wind direction is set at other than the horizontal swing the louver changes to the ver tical position 09 SRK DB 087D b Frost prevention contro...

Page 41: ...ditions 2 Detail of operation Outdoor temperature 10 0 C Outdoor temperature 10 0 C Outdoor fan Outdoor temperature 16 0 C Outdoor temperature 16 0 C Outdoor fan a b c 40 40 40 40 min 1 Lower limit fan speed Note 1 Values in are for the model SRK63 c Indoor fan motor protection min 1 ii 3 Reset conditions Heating 1 Operating conditions 2 Detail of operation a b 5 model 63 3䉝 2 at each 20 seconds 2...

Page 42: ...emperature Tho A Unit rps Model FDC71 Max required frequency Outdoor air temperature is 18 C or higher 76 f Selection of max required frequency by heat exchanger temperature i Maximum required frequency is selected according to the outdoor heat exchanger temperature Tho R during cooling dehumidifying or according to the indoor heat exchanger temperature Thi R during heating mode ii When there are ...

Page 43: ...reaker ON Control contents Operates by selecting one of following start patterns according to the operation mode and the outdoor air temperature Tho A i Low frequency operation control during cooling dehumidifying Control condition Upon establishing the conditions of compressor protection start III the low frequency operation control is performed during cooling dehumidifying Control contents 1 Sta...

Page 44: ...o R1 or R2 whichever the lower zone zone zone zone Tap 1 Tap 1 Tap 2 zone Tap 2 Tap 2 Tap 3 zone Tap 3 Tap 3 Tap 4 zone Tap 3 Tap 4 Tap 5 zone Tap 4 Tap 5 Tap 6 d Outdoor fan control at cooling low outdoor air temperature i When all the following conditions are established after the start of compressor the following control is implemented If the outdoor air temperature Tho A is in the zone in the ...

Page 45: ...e below the defrost operation start temperature as shown by the right figure However it excludes for 10 minutes after the startof compressor and the outdoor air temperature is as shown by the lower figure LPT detection Outdoor air temperature C 2 4 LPT invalid ii Defrost conditions B 1 When previous defrost ending condition is the time out of defrost operation and it is in the heating operation af...

Page 46: ... or after continuous 60 minutes including the stop of compressor E36 is displayed on the remote control and it enters the anomalous stop mode Compressor stop Compressor operation Discharge pipe temperature C 85 115 iii Reset of anomalous stop mode As it drops to the reset value of 85 C or lower for 45 minutes continuously it becomes possible to restart from the remote control b Cooling high pressu...

Page 47: ...as been in the open state for 30 minutes continuously including the stop of compressor e Low pressure control i Protective control If the value detected by the low pressure sensor LPT exceeds the setting value the compressor speed frequency is controlled to restrain the drop of pressure Retention Reduces compressor frequency at every 30 seconds Reset 0 150 0 189 Low pressure MPa ii Anomalous stop ...

Page 48: ...ters the anomalous stop mode h Anti frost control by the compressor frequency control i If the indoor heat exchanger temperature detected with Thi R exceeds the setting value at 4 minutes after the start of compressor the compressor speed frequency is controlled to initiate the anti frost control of indoor heat exchanger ii When there are 2 indoor heat exchanger temperatures Thi R the lowest tempe...

Page 49: ...ter the end of defrosting it is not detected Discharge pipe temperature sensor 10 C or lower Suction pipe temperature sensor 50 C or lower k Fan motor error i If the fan speed of 100min 1 or under is detected for 30 seconds continuously under the outdoor fan control with the operation command of fan tap at speed or higher the compressor stops ii When the fan motor speed drops to 100min 1 or under ...

Page 50: ...ons Stop control is initiated depending on any of the following conditions i Low pressure of 0 087MPa or lower is detected for 5 seconds continuously 1 Red LED Light Green LED Flashing Remote control Displays stop 2 It is possible to restart when the low pressure is 0 087MPa or higher 3 Electronic expansion valve cooling heating is kept fully open ii Stop by the error detection control 1 Red LED K...

Page 51: ...cuit Replacement of PCB 1 time flash Keeps flashing Stays OFF Keeps flashing Indoor return air temperature sensor Defective indoor return air temperature sensor defective element broken wire short circuit Poor contact of temperature sensor connector Replacement repair of temperature sen sor 89 Indoor unit control PCB Defective indoor unit control PCB Defective temperature sensor input circuit Repl...

Page 52: ...t control PCB Defective outdoor unit control PCB Defective 63H input circuit Replacement of PCB Stays OFF Keeps flashing 1 time flash Keeps flashing 6 time flash Inverter PCB or radiator fin Power transistor overheat Replacement of PCB or Repair 106 Stays OFF Keeps flashing 1 time flash Keeps flashing 1 time flash Outdoor unit control PCB compressor Current cut Anomalous compressor over current Re...

Page 53: ...lower is detected for 5 seconds continuously within 60 minutes after initial detection of this anomalous temperature Indoor heat exchanger temperature sensor anomaly 50 C or lower is detected for 5 seconds continuously within 60 minutes after initial detection of this anomalous temperature Or 70 C or higher is detected for 5 seconds continuously Outdoor Outdoor air temperature sensor anomaly 45 C ...

Page 54: ...exchanger remote control switch limit switch transformer and fuse Note 1 With regard to parts of high voltage circuits and refrigeration cycle judge it according to ordinary inspection methods ii Instruction of how to replace indoor unit control PCB Read the SAFETY PRECAUTIONS carefully first of all and then strictly follow it during the replacement in order to protect yourself The precautionary i...

Page 55: ...ed PCB v Reconnect the all wirngs to the PCB that was removed in ii vi Rescrew the terminal Arrow A of the E1 wiring that was removed in i b Control PCB Parts mounting are different by the kind of PCB CNW3 White CNQ Red CNR White CNV2 Black CNV White CNH Black CNTA Blue CNL Black CNC White CNF Yellow CNN Yellow CNI Blue CNJ1 White CNJ2 Grey CNB Black CNM1 White CNP Green A CNT Blue CNG Blue CNW0 W...

Page 56: ...ting are different by the kind of PCB 〇 ON OFF Part number SW2 Blue Address setting SW5 Master Slave setting SW7 Function setting CNT Blue External switch CNJ White Louver motor CNN Yellow Thermistor Heat exchanger CNI Blue Float SW CNH Black Thermistor Return air CNW3 Red Power PCB CNB White Remote control CNG Blue CNZ White HA CNE White RAM checker CNW4 Blue Power PCB SW6 Capacity setting Item S...

Page 57: ...〇 ON OFF Item Switch Address SW2 Master Slave1 Slave2 Slave3 SW5 1 〇 〇 SW5 2 〇 〇 〇 Content of control Plural indoor units control by 1 remote control Master Slave setting Test run SW7 1 Normal Operation check drain motor test run SW6 ON 1 2 3 4 Example setting for 40VH SW6 1 2 3 4 71VH 〇 〇 40VH 〇 〇 Part number SW5 Master Slave setting SW2 Blue Address setting CNI Blue Float SW CNG Blue Motion sens...

Page 58: ...CB Part number CNW3 White Terminal block CNM1 White Fan motor1 CNW1 White Control PCB CNW0 White Terminal block CNM2 Black Fan motor2 CNWR White Reactor Model FDUM71VH PSB012D993 This PCB is a general PCB Replace the PCB according to this instruction i Replace the PCB Unscrew terminal Arrow A of the E2 wiring yellow green that is connected to PCB Replace the PCB only after all the wirings connecte...

Page 59: ...ed Fix the board such that it will not pinch any of the wires Reconnect the wirings to the PCB Wiring connector color should match with the color of connector of the PCB Screw back the terminal of wiring that was removed in ii Power PCB Parts mounting are different by the kind of PCB Models FDE40 71VH FDUM40VH Part number CNM1 White Fan motor CNW1 White Control PCB CNW3 White Terminal block CNW0 W...

Page 60: ...lt setting Note 1 SW8 FDE only OFF OFF OFF OFF ON ON ON ON ON ON ON ON OFF OFF OFF OFF Switch Switch Keep OFF DIP switch setting list SW2 0 SW5 1 OFF SW5 2 OFF SW6 1 SW6 2 SW6 3 SW6 4 SW7 1 OFF SW7 2 OFF SW7 3 OFF SW7 4 SW8 1 SW8 2 SW8 3 SW8 4 OFF OFF OFF OFF OFF OFF JSL1 With Keep OFF Keep OFF Keep OFF Keep OFF Superlink terminal spare Normal switch to spare Reserved Anti freeze control Reserved ...

Page 61: ...nd reconfirming that voltage has been discharged sufficiently by measuring the voltage DC between both terminals of electrolytic capacitor C58 Measurment of voltage may be disturbed by the moisture proof coating In such case remove the coating and measure it by taking care of avoiding electrical shock a Module of part to be replaced for outdoor unit control Outdoor unit control PCB Inverter PCB Te...

Page 62: ...s setting SW4 with the former PCB 4 Connect the connectors to the control PCB Confirm the connectors are not half inserted After elapsing 3 minutes from power OFF Connectors are not half inserted Fig 1 Parts arrangement view Fig 2 Position of terminal Voltage measurement point T26 red 㸪T27 blue CNG1 CNI1 CNI3 CNB CNE CNW2 CNDRM CNA2 CNA1 LED1 Back side LED2 Back side CNN1 CNEEV1 CNS CNN2 CNFAN CNE...

Page 63: ...JSW10 11 T62 Orange Parts No T22 White T21 Red T23 Blue CNG2 T28 Red T30 Blue T29 White T51 Yellow PCA012D067B LED Yellow c Outdoor inverter PCB replacement procedure Precautions for Safety Since the following precaution is the important contents for safety be sure to observe them WARNING and CAUTION are described as follows WARNING Indicates an imminently hazardous situation which will result in ...

Page 64: ...aces where harness bands and screws are removed Remove the harness bands from control unit after removing the harnesses from harness bands Remove the screws Presence and shape of electric component may vary according to model Hole for harness clip installation Fig 4 Fix the harness on the harness clip Presence and shape of electric component may vary according to model Harness clip T27 T26 After e...

Page 65: ...SW5 1 OFF SW5 2 OFF SW5 3 OFF SW5 4 OFF SW7 1 OFF SW7 2 OFF SW7 3 OFF SW8 1 OFF SW8 2 OFF SW8 3 OFF SW9 OFF Default setting Pump down operation Reserved Normal Pump down Normal Reserved Reserved Reserved Test run mode Cooling Heating Cooling Test run Switch Normal Test run Normal Model selection Keep OFF Model selection Keep OFF Reserved Keep OFF Reserved Keep OFF Model selection 3 phase Single ph...

Page 66: ...Anomaly operation data Corresponding data may not be provided depending on models Such items will not be displayed Operating procedure On the TOP screen touch the buttons in the order of Menu Service setting Service Maintenance Service password Set Error display Error history When only one indoor unit is connected to the remote control followings will be displayed 1 When there is any anomaly Loadi...

Page 67: ...control of inverter primary current P 47䠈䠄㻢䠅 f 4 High pressure protection control P 45䠈䠄㻢䠅 b i 䠈P 46䠈䠄㻢䠅 c i 5 High pressure anomaly P 45䠈䠄㻢䠅 b ii 6 Low pressure protection control P 46䠈䠄㻢䠅 e i 䚷 7 Low pressure anomaly P 46䠈䠄㻢䠅 e ii 8 Anti frost prevention control P 47䠈䠄㻢䠅 h 9 Current cut P 47䠈䠄㻢䠅 f 11 Power transistor anomaly Overheat P 47䠈䠄㻢䠅 g 13 Spare 15 Current safe control of inverter second...

Page 68: ...g places on each te rminal P Power transistor P terminal N Power transistor N terminal U End of red harness to compressor V End of white harness to compressor W End of black or blue harness to compressor Check for a power transistor short circuit When you do not have a diagnostic checker for judging if the inverter is defective measure between the terminals of the power transistor parts judge whet...

Page 69: ...aker 2 Remove the terminal cover of compressor and disconnect the wires U V W from compressor 3 Connect the wires U Red V White and W Black of checker to the terminal of disconnected wires U V W from compressor respectively ii Operation for judgment 1 Power ON after JSW10 4 on outdoor inverter PCB was turned ON 2 After 15 seconds since power has turned ON LED start ON OFF for 5 seconds cyclically ...

Page 70: ...place with F3 fuse Replace also fan motor LED1 Yellow check DC Reactor continuity Check Max 25mΩ C1 PCB 2 INVERTER PWB CNI4 CNI2 6 Ri Si Ro1 So1 TB1 U V W U W V G1 L N E L1 MS ３ DS1 CNE CT1 RAM CHEC KE R 2 CNE CNW2 CNW CNV 6 CNI1 PCB 1 CONTROL PWB CNS CNEEV1 CNEEV2 CNFAN CNIP CNB CNTH EEVC EEVH CNPS PSL M RAM CHEC KE R CH CNR 20S CNN2 CNA2 M ThA ThS ThD ThR1 ThR2 CNN1 CNA1 FM1 M Ro3 So3 SW 4 INTER...

Page 71: ...ndoor units more than 17 units by controlling with one remote control 92 E11 Address setting error of indoor units 93 E14 Communication error between master and slave indoor units 94 E16 Indoor fan motor anomaly 95 E18 Address setting error of master and slave indoor units 96 E19 Indoor unit operation check drain pump motor check setting error 97 E20 Indoor fan motor rotation speed anomaly 98 E28 ...

Page 72: ...he compressor operating NO YES NO Note 1 Outdoor 35 C Indoor 27 C 1 WAIT It is normal This unit is designed to start in the soft start mode by detecting the under dome temperature of compressor when it restart after power reset It is necessary to replace to higher capacity one or two install additional unit Compressor refrigerant oil protection control at starting is activated For the contents of ...

Page 73: ... NO YES NO Note 1 Outdoor 7 C Indoor 20 C 1 WAIT It is normal This unit is designed to start in the soft start mode by detecting the under dome temperature of compressor when it restart after power reset It is necessary to replace to higher capacity one or two install additional unit Compressor refrigerant oil protection control at starting is activated For the contents of control refer to the com...

Page 74: ...ately after installation or when the unit has been left for long time without power source the insulation resistance may drop to a few MΩ because of refrigerant migrated in the compressor When the earth breaker is activated at lower insulation resistance check the following points Check if the earth leakage breaker is conformed to higher harmonic regulation or not Since the unit is equipped with i...

Page 75: ... the gap if necessary Prevent the vibration from transmitting to wall and etc by fixing pipes on the wall or wrapping rubber cushion around the pipe which goes through the hole in the wall or applying other appropriate means Strength of ceiling wall floor etc may be insufficient Review the installing position or reinforce it Check for leaning of installed unit or anomalous mounting of fan louver o...

Page 76: ...of piping of air conditioner It is likely to occur particularly during cooling or defrost operation in the heating mode It is normal The noise vibration occurs when the refrigerant starts or stops flowing It is normal When the defrost operation starts or stops during heating the refrigerant flow is reversed due to switching 4 way valve This causes a large change in pressure which produces a blowin...

Page 77: ...on of air nitrogen etc In such occasion it is necessary to recover refrigerant vacuum dry and recharge refrigerant Since there could be many causes of noise vibration the above do not cover all In such case check the conditions when where how the noise vibration occurs according to following check point Indoor outdoor unit Cooling heating fan mode Startup stop during operation Operating condition ...

Page 78: ... Is LM locked Check at the indoor unit side LM louver motor Is the louver operable with the remote control YES NO Does the louver operate at the power on YES NO YES NO Operate after waiting for more than 1 minute Repair wiring Defective indoor unit control PCB Replace Replace LM Normal Adjust LM lever and then check again 2 Error detection method 3 Condition of error displayed 4 Presumable cause D...

Page 79: ... of indoor unit NO YES NO Is AC380 415V for 3 phase unit detected between ձ ղ and ճ on the teminal block of outdoor unit or isAC220 240V for 1 phase unit detected between ձ and ղ on the terminal block of outdoor unit YES Defective outdoor unit control PCB Noise filter Replace Misconnection or breakage of connecting wires Defective indoor unit control PCB Replace Replace FM LM etc Replace fuse Defe...

Page 80: ... in the indoor terminal block exceed 15 VDC YES NO YES NO NO YES Does the voltage between X and Y in the indoor terminal block exceed 15 VDC Remove wire for the remote control Power source reset YES Correct Insert connector securely Remote control wire breakage Replace remote control Malfunction by temporary noise Defective indoor unit control PCB Replace Remote control wire breakage Replace remot...

Page 81: ...he indoor and outdoor unit Power source reset NO YES YES NO NO NO NO NO YES YES YES Set one remote control for Master and the other for Slave YES Note 3 Only indoor unit with drain pump Set SW1 on remote control PCB at Master Normal Set address again SW2 on indoor unit control PCB Separate remote control wires from high voltage wires Defective indoor unit control PCB Replace Defective remote contr...

Page 82: ...r the power on with remote control 3 Condition of error displayed Same as above 4 Presumable cause Improper setting Surrounding environment Defective remote control communication circuit Faulty indoor unit control PCB Faulty outdoor unit control PCB Note If any error is detected 30 minutes after displaying WAIT on the remote control the display changes to INSPECT I U NO NO NO NO NO Are more than 3...

Page 83: ...door units YES YES NO Is approx DC20V detected between on the outdoor unit terminal block Is approx DC20V detected between on the indoor unit terminal block WAIT To next page Defective indoor unit control PCB Replace Defective indoor unit control PCB Replace Defective remote control Replace Broken remote control wire X or Y Replace Correct connection wires between indoor and outdoor units Defectiv...

Page 84: ...s AC220 240V or AC380 415V detected at the noise filter secondary side Is fuse 250V 2A on the outdoor unit control PCB blown YES YES Is DC5V detected on the outdoor unit control PCB Between of CNV NO YES Is DC5V detected if the connector of outdoor fan motor is disconnected NO Is DC255 310V detected at CNA2 1 To next page From previous page Normal Malfunction by noise Replace noise filter Check co...

Page 85: ... source fuse Replace the inverter PCB Replace the reactor Replace the electrolytic capacitor NO Replace the power source fuse YES Is there a short circuit between phases of the noise filter Is there a short circuit between phases of inverter PCB input terminals Is there any crack burning on the power transistor module Is the reactor OK Is the electrolytic capacitor OK From previous page 2 Error de...

Page 86: ...trolconnection terminals Is DC10V or higher detected on remote control wires if the remote control is removed Are wires connected properly between the indoor outdoor units YES Defective remote control Defective remote control Defective connecting wire Defective remote control wire Short circuit etc Defective indoor unit control PCB Replace 2 Error detection method 3 Condition of error displayed 4 ...

Page 87: ...ween indoor outdoor units Power source reset NO 1 Malfunction by noise Check peripheral environment Defective indoor unit control PCB Replace Move to E5 Communication error during operation Check 2 Error detection method When normal communication between the remote control and the indoor unit is interrupted for more than 2 minutes Detectable only with the remote control 3 Condition of error displa...

Page 88: ...or breakage of signal wires between indoor outdoor units YES NO YES NO YES NO In case that the outdoor unit red LED flashes 2 time Repair signal wires Repair signal wires To the diagnosis of WAIT Unit is normal Malfunction by temporary noise etc Defective outdoor unit PCB Defective network communication circuit Replace Unit is normal Malfunction by temporary noise etc 2 Error detection method When...

Page 89: ... heat exchanger temperature sensor Replace Defective indoor unit control PCB Replace Defective indoor heat exchanger temperature sensor input circuit 2 Error detection method Anomalously low temperature or high temperature resistance is detected on the indoor heat exchanger temperature sensor Thi R1 R2 or R3 3 Condition of error displayed When the temperature sensor detects 50 C or lower for 5 sec...

Page 90: ...orrect Connect connector Defective return air temperature sensor Replace Defective indoor unit control PCB Replace Defective return air temperature sensor input circuit 2 Error detection method Anomalously low temperature or high temperature resistance is detected by indoor return air temperature sensor Thi A 3 Condition of error displayed When the temperature sensor detects 50 C or lower for 5 se...

Page 91: ...igh Note 2 For characteristics of indoor heat exchanger temperature sensor see the error display E6 YES NO YES NO Error stop Reset Indoor heat exchanger temperature C 56 63 Wash Defective indoor heat exchanger temperature sensor connector Correct Defective indoor heat exchanger temperature sensor Replace Check refrigerant system Adjust 2 Error detection method Indoor heat exchanger temperature sen...

Page 92: ...n pipe slop OK NO YES NO YES NO Check float switch Defective indoor unit control PCB Replace Defective indoor unit control PCB Replace Check option equipment Correct setting to Humidifier drain pump motor interlock Defective indoor unit control PCB Replace Check wiring of drain pump motor Correct Check drain pump motor 2 Error detection method Float switch is activated 3 Condition of error display...

Page 93: ...FF 1 Applicable model 5 Troubleshooting Diagnosis Countermeasure Are more than 17 indoor units connected to one remote control NO YES Defective remote control Replace Reduce to 16 or less units 2 Error detection method When it detects more than 17 of indoor units connected to one remote contorl 3 Condition of error displayed Same as above 4 Presumable cause Excessive number of indoor units connect...

Page 94: ...address by DIP switch SW2 on indoor unit control PCB 2 Error detection method IU address has been set using the Master IU address set function of remote control 3 Condition of error displayed Same as above 4 Presumable cause Mistake of address setting method Address setting from remote control can t be done Note Is Master IU address set function of remote control used E11 occurs YES IU IU IU R C I...

Page 95: ...ource Note 1 Set DIP switches SW5 1 and SW5 2 as shown in the following table Factory default setting Master Master Slave a Slave b SW5 1 OFF OFF ON SW5 2 OFF ON OFF DIP switch Indoor unit YES NO NO YES Correct unit address setting Correct wiring Defective indoor unit control PCB Replace Malfunction by noise Check surrounding environment 2 Error detection method When communication error between ma...

Page 96: ...r voltage Replace faulty fan motor and indoor unit control PCB Replace fan motor If the error persists after replacing the fan motor replace the indoor unit control PCB Malfunction by temporary noise 2 Error detection method Detected by rotation speed of indoor fan motor 3 Condition of error displayed When actual rotation speed of indoor fan motor drops to lower than 200min 1 for 30 seconds contin...

Page 97: ...leshooting Diagnosis Countermeasure In cases of RC EX3A Menu Service setting IU settings Select IU In cases of RC E5 Return address No to IU using or button 2 Error detection method IU address has been set using the Master IU address set function of remote control 3 Condition of error displayed Same as above 4 Presumable cause Same as above Note Is Master IU address set function of remote control ...

Page 98: ...unit control PCB ON E19 occurs when the power ON NO YES Defective indoor unit control PCB Defective SW7 Replace Turn SW7 1 on the indoor unit control PCB OFF and reset the power 2 Error detection method After indoor operation check when the communication between indoor and outdoor unit is established and SW7 1 is still kept ON 3 Condition of error displayed Same as above 4 Presumable cause Mistake...

Page 99: ...e fan motor Check power voltage Replace faulty fan motor and indoor unit control PCB Replace fan motor If the error persists after replacing the fan motor replace the indoor unit control PCB Malfunction by temporary noise 2 Error detection method Detected by rotation speed of indoor fan motor 3 Condition of error displayed When the actual fan rotation speed does not reach to the speed of required ...

Page 100: ...After 3 minute delay the compressor starts again automatically but if this error occurs again within 60 minutes after the initial detection 4 Presumable cause Faulty connection of remote control temperature sensor Defective remote control temperature sensor Defective remote control PCB Note After 10 seconds has passed since remote control temperature sensor was switched from valid to invalid E28 w...

Page 101: ...e sensor Check unit side Isn t the air circulation of outdoor unit short circuited Are installation spaces adequate Isn t there any fouling or clogging on heat exchanger Control operation check Defective outdoor unit control or main PCB Replace Excessive refrigerant amount Recharge refrigerant by weighing proper amount on a scale 2 Error detection method For the error detection method refer to the...

Page 102: ... unit side Isn t filter clogged Are indoor outdoor unit installation spaces adequate Isn t there any short circuit of air Isn t there any fouling clogging on indoor heat exchanger 2 Error detection method For the error detection method refer to cooling high pressure protective control in the protective control by controlling compressor rotation speed of microcomputer control function for correspon...

Page 103: ...f anomalously low temperature resistance on the outdoor heat exchanger temperature sensor 3 Condition of error displayed When the temperature sensor detects 50 C or lower for 20 seconds continuously within 2 minutes to 2 minutes 20 seconds after the compressor ON the compressor stops After 3 minutes delay the compressor starts again automatically but if this anomalous temperature is detected 3 tim...

Page 104: ...istance kΩ Correct connector Defective outdoor air temperature sensor Replace Defective outdoor unit control or main PCB Replace Defective outdoor air temperature sensor input circuit 2 Error detection method Detection of anomalously low temperature resistance on outdoor air temperature sensor 3 Condition of error displayed When the temperature sensor detects 45 C or lower for 5 seconds continuous...

Page 105: ...ensor input circuit 2 Error detection method Detection of anomalously low temperature resistance on the discharge pipe temperature sensor 3 Condition of error displayed When the temperature sensor detects 10 C or lower for 5 seconds continuously within 10 minutes to 10 minutes 20 seconds after the compressor ON the compressor stops After 3 minute delay the compressor starts again automatically but...

Page 106: ...e must be reset NO Open the service valve Correct 63H1 connector Correct electronic expansion valve connector Defective outdoor unit control or main PCB Replace Defective 63H1 input circuit 2 Error detection method When the high pressure switch 63H1 is activated Compressor OFF Compressor ON 3 15 4 15 High pressure MPa 3 Condition of error displayed If 63H1 turns OFF opened the compressor stops Aft...

Page 107: ... output voltage is detected between and on CNI3 E41 is displayed See Note mentioned below 3 Condition of error displayed Seme as above 4 Presumable cause Inverter PCB anomaly Outdoor fan motor anomaly Outdoor unit control PCB anomaly Noise filter PCB anomaly Note The Single phase models of inverter PAC have no function to output the signal for the power transistor overheat However since the power ...

Page 108: ...lves Check refrigerant amount and refrigerant circuit In case of transitional increase of high pressure and or test run several times restarting may recover it because liquid refrigerant migrated in the compressor is discharged from the compressor Replace compressor 2 Error detection method In order to prevent from overcurrent of inverter if the current exceeds the specifications it makes the comp...

Page 109: ...ipe temperature sensor normal Is there any anoumalous sound on the compressor YES YES From previous page Defective inverter or outdoor unit main PCB Replace Defective inverter or outdoor unit main PCB Replace 2 Error detection method In order to prevent from overcurrent of inverter if the current exceeds the specifications it makes the compressor stopping 3 Condition of error displayed If the outp...

Page 110: ... model Note 1 How to check voltage at CN13 See E51 Note 2 Under anomalous conditions the voltage becomes less than DC14V Is DC15V detected between and on CNI3 Is DC15V detected after disconnecting outdoor fan motor YES YES NO Correct the connection Set JSW10 11 correctly See pages from 62 64 Replace outdoor fan motor Replace outdoor unit control PCB if not solved replace inverter PCB as well Conne...

Page 111: ...erter PCB Replace 2 Error detection method In order to prevent from overcurrent of A F if the current exceeds the specifications it makes the compressor stopping 3 Condition of error displayed If the output current of A F exceeds the specifications it makes the compressor stopping 4 Presumable cause Defective inverter PCB Note Error code Remote control LED Green Red Outdoor control PCB Outdoor inv...

Page 112: ...p After 3 minute delay it starts again automatically but if this anomaly occurs 5 times within 60 minutes after the initial detection 4 Presumable cause Defective outdoor unit control PCB Foreign material at rotational area of fan propeller Defective fan motor Dust on outdoor unit control PCB Blow fuse External noise surge Note When E48 error occurs in almost cases F3 fuse 2A on the outdoor unit c...

Page 113: ...ure drop and suction superheat 3 Condition of error displayed When the low pressure sensor detects 0 079MPa or lower for 15 seconds continuously compressor stops and it restarts automatically after 3 minute delay And if this anomaly occurs 3 times within 60 minutes 10 minutes after the compressor starts if the low pressure sensor detects 0 15MPa or lower for 60 minutes continuously and compressor ...

Page 114: ...on From previous page Open fully Correct Defective low pressure sensor suction pipe temperature sensor Replace Charge refrigerant Defective outdoor unit control PCB Replace Defective low pressure sensor suction pipe temperature sensor circuits 2 Error detection method 3 Condition of error displayed 4 Presumable cause Note Error code Remote control LED Green Red Outdoor control PCB Outdoor inverter...

Page 115: ...an motor YES YES NO Model FDC71VNX W Note 1 Under anomalous conditions the voltage becomes less than DC14V Replace inverter PCB If not solved replace noise filter PCB as well Replace outdoor fan motor Replace outdoor unit control PCB If not solved replace inverter PCB as well 2 Error detection method When power transistor anomaly is detected for 15 minutes continuously 3 Condition of error display...

Page 116: ... 2 Error detection method When the suction pipe temperature sensor detects anomalously low temperature 3 Condition of error displayed If the temperature sensor detects 50 C or lower for 5 seconds continuously within 10 minutes to 10 minutes 20 seconds after compressor ON the compressor stops When the compressor is restarted automatically after 3 minute delay if this anomaly ocuurs 3 times within 4...

Page 117: ...ion method When anomalous voltage pressure is detected 3 Condition of error displayed If the pressure sensor detects DC0V or lower and DC4 0V or higher for 5 seconds continuously within 2 minutes to 2 minutes 20 seconds after compressor ON the compressor stops When the compressor is restarted automatically after 3 minute delay if this anomaly occurs 3 times within 40 minutes 4 Presumable cause Def...

Page 118: ...detection method Judge insufficient refrigerant amount by detecting the temperature differnce between indoor heat exchanger Thi R and indoor return air Thi A 3 Condition of error displayed Anomalous stop at initial detection 4 Presumable cause Defective indoor heat exchanger temperature sensor Defective indoor return air temperature sensor Defective indoor unit control or main PCB Insufficient ref...

Page 119: ...or detection method When it fails to change over to the operation for rotor position detection of compressor motor 3 Condition of error displayed If the compressor fails to startup for 20 times 10 patterns 2 times continuously 4 Presumable cause Outdoor fan motor anomaly Outdoor unit control PCB anomaly Inverter PCB anomaly Anomalous power source voltage Insufficient or excessive refrigerant amoun...

Page 120: ... inverter output OK Check by inverter checker Does it start NO YES YES YES Note 1 Several times restarting may recover it because liquid refrigerant migrated in the compressor could be discharged from the compressor After power OFF turn SW10 4 of inverter PCB ON and connect the inverter checker Then power ON again Try to restart several times From previous page Replace inverter PCB Replace inverte...

Page 121: ...ut the outdoor unit 09 SRK DB 087D 2 TROUBLESHOOTING PROCEDURES FOR ELECTRICAL EQUIPMENT 1 Cautions 2 Items to check before troubleshooting 3 Troubleshooting procedure If the air conditioner does not run at all Important YES YES YES NO NO NO NO YES Reference Reference AC proced wireless source source satisfied ...

Page 122: ... 121 19 PAC SM 332 09 SRK DB 087D 4 Troubleshooting procedure If the air conditioner runs NO NO NO NO YES YES YES YES See page 122 See pages 123 129 See pages 123 129 ...

Page 123: ...tor position after shifting to the compressor rotor position detection operation the compressor stops Defective compressor Operation status Installation status Compressor rotor lock error When the outdoor fan motor speed continues for 30 seconds or longer at 75 min 1 or lower 3 times The air conditioner stops Defective fan motor poor connector connection Outdoor fan motor error Indoorunitdisplaypa...

Page 124: ...can be checked These are the data which display the reason by a stop occurred when the air conditioning system performed protective stops etc in the past Even if stop data alone are generated the system previous occasion are erased Important In cases where transient stop data only are generated the air conditioner system more times it could lead to customer complaints b Service mode display proced...

Page 125: ...de mode mode 21ºC 22ºC 23ºC 24ºC 25ºC 1 time previous previous time 2 times previous 3 times previous 4 times previous 5 times previous Only for indoor heat exchanger temperature sensor 2 Indicates the number of occasions previous to the present the error display data are from Temperature setting 26ºC 27ºC 28ºC 29ºC 30ºC 1 time previous previous time 2 times previous 3 times previous 4 times previ...

Page 126: ... the stop stop code 2 times previous when the air conditioner was stopped by protective stop control Displays the reason for the stop stop code 3 times previous when the air conditioner was stopped by protective stop control Displays the reason for the stop stop code 4 times previous when the air conditioner was stopped by protective stop control Displays the reason for the stop stop code 5 times ...

Page 127: ... operation and the compressor stops When the anti frost control operates and the compressor stops during cooling operation When 10 seconds passes after the power is turned on without communications signals from the indoor or outdoor unit being detected correctly When the current is 1A or less at the time the compressor started When the power source voltage drops during operation When the compresso...

Page 128: ...AUTO DRY COOL FAN HEAT TIMER light 1 s digit Display pattern when in service mode Fan speed mode when there is an abnormal stop 2 time flash 3 time flash 4 time flash AUTO HI MED LO 5 time flash ULO 6 time flash 7 time flash operation mode and fan speed mode becomes as follows HI POWER ECONO Mode Operation mode Fan speed mode 0 5 sec 1 5 sec RUN light 10 s digit TIMER light 1 s digit 11 second int...

Page 129: ... 84 94 55 45 35 25 15 5 5 15 25 35 45 55 65 75 85 95 56 46 36 26 16 6 6 16 26 36 46 56 66 76 86 96 57 47 37 27 17 7 7 17 27 37 47 57 67 77 87 97 58 48 38 28 18 8 8 18 28 38 48 58 68 78 88 98 59 49 39 29 19 9 9 19 29 39 49 59 69 79 89 99 No does not sound Sensor name Room temperature sensor Indoor heat exchanger temperature sensor Outdoor air temperature sensor Outdoor heat exchanger temperature se...

Page 130: ...6 126 146 48 28 8 8 28 48 68 88 108 128 148 50 30 10 10 30 50 70 90 110 130 150 52 32 12 12 32 52 72 92 112 132 54 34 14 14 34 54 74 94 114 134 56 36 16 16 36 56 76 96 116 136 58 38 18 18 38 58 78 98 118 138 No does not sound Sensor value displayed when the error code is normal 64ºC 0 5 sec 0 1 sec 1 5 sec 11 second interval 0 5 sec OFF ON OFF ON OFF ON temperature information data Buzzer sound If...

Page 131: ... 130 19 PAC SM 332 09 SRK DB 087D Service data record form 124 Operation mode Fan speed mode Wireless r Wireless r Wireless r Wireless r Wireless r wireless Wireless r ...

Page 132: ...t PCB check procedure Power source reset Is it normalized Malfunction by temporary noise Replace fan motor If the error persists after replacing the fan motor replace the indoor unit PCB Short circuit Sensor temperature characteristics Room temperature indoor heat exchanger temperature the fan motor and indoor unit PCB separately Is the output of the indoor unit PCB normal Defective indoor unit PC...

Page 133: ...09 SRK DB 087D Error of signal transmission Wiring error including power cable defective indoor outdoor unit PCB source Defective outdoor unit PCB Defective outdoor unit PCB Check crossover wires Defective indoor unit PCB ...

Page 134: ...en DC 0 and 20V Inspect power source for outdoor unit Replace fuse Replace indoor unit PCB Is the fuse burnt out 3 15 A NO YES YES NO YES NO b Indoor fan motor check procedure i Indoor unit PCB output check FMi DC15V Indoor unit PCB DC 308 336V DC several V 4 6 V CNU GND Blue Yellow White Black Red Sensor Operation mode Phenomenon Shortcircuit Disconnected wire Heat exchanger sensor Cooling Heatin...

Page 135: ... FMi DC15V Indoor unit PCB DC 308 336V DC several V 4 6 V CNU GND Blue Yellow White Black Red Measuring point Resistance when normal Measuring point Voltage range when normal k M 1 2 3 This is a diagnostic procedure for determining if the indoor fan motor or the indoor unit PCB is broken down in the following figure are output for approximately 30 seconds it means that the indoor unit PCB is norma...

Page 136: ...an motor is faulty YES YES YES NO NO NO Replace the faulty part and the fuse Test run then the unit for checking Is there any damage on the internal circuit of fan motor Check the resistance value to judge See pages 133 to 135 Is the fuse blown on the indoor unit PCB Is there any faulty part fan motor etc See pages 133 to 135 Replace the fuse on the indoor unit PCB When the operation is checked wi...

Page 137: ... 4 5 1 2 3 4 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 BK BK BK BK BK BK BK BK BK BL RD BR OR WH YE GN RD 12 12 12 3 Power source line Signal line 1 2 3 CNW3 WH 1 3 WH BL 2 0A 3 15A WH YE GN PIS WHWHWHWHWHWHWHWHWHWHBL BL BL BL BL BL BL BL BL BL RD RD RD RD RD RD RD RD RD RD SW2 1 BK BK BK BK BK RD WH E1 Indoor unit PCB 1 2 Option Remote operation input volt free contact The line between...

Page 138: ...BR OR WH 12 12 2 0A YE GN １ BK BK RD WH LM4 LM1 LM2 LM3 M M 1 M M 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 M M 1 M M BK 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 BK BK BK BK BK BK BK BK BK WH WH WH WH WH WH WH WH WH WH BL BL BL BL BL BL BL BL BL BL RD RD RD RD RD RD RD RD RD RD E1 F1 CNWO WH 1 3 5 YE GN RD 3 15A WH Power circuit Indoor unit PCB CNL BK 3 1 2 BK BK BK Option 1 2 volt free contact HS BK BK ...

Page 139: ...e wiring diagram of outdoor unit about the line between indoor unit and outdoor unit 3 Use twin core cord 0 3mm 2 at remote control line See spec sheet of remote control in case that the total length is more than 100m 4 Do not put remote control line alongside power source line 5 Section 1 1 shows electric circuit of motion sensor Option FMi2 FS Float switch Indication lamp Red Inspection Indicati...

Page 140: ... circuit BL or BK BR or WH WH or BL OR or YE 1 BL 3 1 WH CNW3 WH 1 2 WH RD YE GN 3 5 CNW0 WH 1 3 YE GN TB1 F1 3 15A L CNWR2 WH BK F2 3 15A Earth The line between 2 1 3 Power source line Signal line indoor unit and outdoor unit 1 2 CNTA BL Remote operation input volt free contact 12 Prepare on site XR5 Remote operation input volt free contact FMi1 FS Float switch Indication lamp Red Inspection Indi...

Page 141: ... Power PCB Power circuit 1 Earth The line between 2 1 3 Power source line Signal line indoor unit and outdoor unit M 1 4 5 6 7 F4 2A CNM2 BK RD BL or BK BR or WH WH or BL OR or YE BL 3 1 WH CNW3 WH 1 2 WH RD YE GN 3 5 CNW0 WH 1 3 TB1 F1 5A YE GN 1 2 CNTA BL Remote operation input volt free contact 12 Prepare on site XR5 Remote operation input volt free contact FMi2 FS Float switch Indication lamp ...

Page 142: ...3 14 15 16 17 18 19 20 CNJ WH BL PK BR OR RD 12 1 PIS CNG BL CNV2 BK 2 4 3 1 3 Option WH BK RD WH RD BK WH RD BK WH RD BK CNL1 WH CNL2 WH Prepare on site CNZ CNC For HA WH RD SW2 SW6 SW5 SW7 LED 2 LED 3 SW8 1 5 Section 1 1 shows electric circuit of motion sensor Option Notes 1 indicates wiring on site 2 See the wiring diagram of outdoor unit about the line between indoor unit and outdoor unit 3 Us...

Page 143: ... CIRCUIT PRINTED SM 1 LM 1 CNX M M M 5 5 LM 2 RD WH RD WH BK BL Y Y G BK CNG CNE DISPLAY WIRELESS RECEIVER CNF BACK UP SW 2 8 Th2 1 Th2 2 Th1 Th3 CNY Y G CNM 5 Color Marks Blue Black BK Red BL RD White WH Yellow Green Y G Yellow Y Color Mark Heat exchanger temperature sensor Humidity sensor Fan motor Room temperature sensor Flap motor Th1 Th2 1 2 Th3 Diode stack DS Fuse F Connector CNE FMi Termina...

Page 144: ... operation 1 Trial operation can be performed by using SW5 3 2 Cooling trial operation will be performed when SW5 4 is OFF and heating trial operation when SW5 4 is ON 3 Be sure to turn OFF SW5 3 after the trial operation is finished CNN1 YE CNPS 63H1 BK BK BL BL 20S CNS RD BR BR CNR WH CH CNA2 WH CNA1 WH BL RD BL RD C1 RD BL CNH PK CNI3 WH CNI1 WH CNG1 BK BL BL BK CNG2 BK CNI4 WH CNI2 WH MS 3 CM ...

Page 145: ...urn air Thi A Temperature sensor Heat exchanger Thi R3 Temperature sensor Heat exchanger Thi R2 Temperature sensor Heat exchanger Thi R1 Service valve Flare connecting Temperature sensor Heat exchanger Thi R1 Muffler Temperature sensor Return air Thi A Temperature sensor Heat exchanger Thi R3 Temperature sensor Heat exchanger Thi R2 Heat exchanger Indoor unit Indoor unit Outdoor unit Flare connect...

Page 146: ...sensor for frost prevention Temperature sensor for protection high pressure in cooling Tho R Outdoor unit OFF 65 ON 51 Temperature sensor for detecting discharge pipe temperature Tho D Outdoor unit OFF 115 ON 85 High pressure switch for protection 63H1 Outdoor unit OFF 4 15MPa ON 3 15MPa Low pressure sensor for protection LPT Outdoor unit OFF 0 079MPa ON 0 227MPa OFF 63 ON 56 OFF 1 0 ON 10 ...

Page 147: ...ectronic expansion valve Strainer Receiver Muffler Capillary tube Outdoor air temperature sensor Muffler Compressor Discharge pipe temperature sensor 4way valve TH3 TH2 Heat exchanger temperaturesensor TH1 EEV Capillary tube Heat exchanger Accumulator Muffler Reducer Accessory Model 71 Indoor unit Heat exchanger temperature sensor Heat exchanger temperature sensor Room temperature sensor Th3 Th1 H...

Page 148: ... BY MICROCOMPUTER 2 1 2 MAINTENANCE DATA 2 1 3 ELECTRICAL WIRING 2 1 4 PIPING SYSTEM 4 2 1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 4 2 2 MAINTENANCE DATA 4 2 3 ELECTRICAL WIRING 4 2 4 PIPING SYSTEM 4 2 MICRO INVERTER PACKAGED AIR CONDITIONERS CONTENTS 2 1 HYPER INVERTER PACKAGED AIR CONDITIONERS 2 MICRO INVERTER PACKAGED AIR CONDITIONERS ...

Page 149: ...to ku Tokyo 108 8215 Japan http www mhi co jp Copyright MITSUBISHI HEAVY INDUSTRIES LTD Because of our policy of continuous improvement we reserve the right to make changes in all specifications without notice INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR CONDITIONERS ...