Mitsubishi Heavy Industries FDC100VNA-W, Service Manual

Page 1: ...VSAWTVH Triple type FDTC140VNAWTVH 140VSAWTVH MICRO INVERTER PACKAGED AIR CONDITIONERS Single type SRK100VNAWZR 100VSAWZR WALL MOUNTED TYPE Twin type SRK100VNAWPZSX 100VSAWPZSX 125VNAWPZSX 125VSAWPZSX 140VNAWPZR 140VSAWPZR Triple type SRK140VNAWTZSX 140VSAWTZSX DUCT CONNECTED HIGH STATIC PRESSURE TYPE Single type FDU100VNAWVH 100VSAWVH 125VNAWVH 125VSAWVH 140VNAWVH 140VSAWVH OUTDOOR UNIT FDC100VNA...

Page 2: ... 19 PAC SM 309 1 TABLE OF CONTENTS 1 MICRO INVERTER PACKAGED AIR CONDITIONERS 2 2 V MULTI SYSTEM 201 ...

Page 3: ...4 Cooling dehumidifying frost protection 21 15 Heating overload protection 21 16 Anomalous fan motor 21 17 Plural unit control Control of 16 units group by one remote control 22 18 High ceiling control 22 19 Abnormal temperature sensor retun air indoor heat exchanger broken wire short circuit detection 23 20 External input output control CnT or CnTA 23 21 Operation permission prohibition 25 22 Tem...

Page 4: ...DRY operation 40 1 1 4 Operation control function by the outdoor control 41 1 Determination of comressor speed Frequency 41 2 Compressor start control 41 3 Compressor soft start control 42 4 Outdoor fan control 43 5 Defrost operation 44 6 Protective control anomalous stop control by compressor s number of revolutions 45 7 Silent mode 48 8 Test run 48 9 Pump down control 49 1 2 MAINTENANCE DATA 50 ...

Page 5: ... 19 PAC SM 309 4 1 3 DISASSEMBLY PROCEDURE 174 1 Indoor unit 174 2 Outdoor unit 186 1 4 ELECTRICAL WIRING 188 1 Indoor unit 188 2 Outdoor unit 197 1 5 PIPING SYSTEM 199 ...

Page 6: ...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 7: ...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 8: ...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 9: ...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 10: ...els 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 receiver Unit ON OFF button Illuminates during operation Blinks when airflow stops due to the HOT KEEP CLEAN operation and operat...

Page 11: ...oor 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 funct...

Page 12: ... 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 13: ...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 14: ...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 15: ...ir temperature 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...

Page 16: ...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 time to s...

Page 17: ...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 18: ...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 19: ...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 20: ...ed 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...

Page 21: ...in 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 m...

Page 22: ...oor fan speed 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 of indoor fan speed is increased by 20min 1 ii I...

Page 23: ...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 24: ...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 CnT CnT 20...

Page 25: ...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 26: ... 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 27: ...ne Actual 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 Operatio...

Page 28: ...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 29: ...emperature 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 effecti...

Page 30: ...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 starting...

Page 31: ...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 32: ...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 33: ... ࠉUnit ON OFF button a Operation b Details of operation 2 ࠉAuto restart function a b i ii 4 Custom cord switching procedure a Modifying the indoor printed circuit board b Modifying the wireless remote control i ii Cut Function Operation mode Room temperature setting Fan speed Flap Louver Timer switch Cooling DRY Heating Unit ON OFF button whether to go into the COOL DRY or HEAT modes Only SRK ZSX ...

Page 34: ...perate 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 LOUVER button while the swing louver is moving so that four stop positions are displayed one after another per second When a desired stop position is displayed press the LOUVER button again...

Page 35: ...FF timer for a week Up to 8 patterns can be set for a day The day off setting is provided for holidays and non business days Note 1 It is necessary to set the clock to use the weekly timer vii Combination of patterns which can be set for the timer operations Note 1 Allowed Not Sleep time Sleep time Set OFF timer by hour Weekly timer Set ON timer by hour Set OFF timer by clock Set ON timer by clock...

Page 36: ...gnal cannot be received from the indoor control with outdoor control having serial signals continues for 7 minutes and 35 seconds the compressor is stopped After the compressor has been stopped it will be re started after the compressor start delay if a serial signal can be received again from the indoor control 8 Plural unit control Control of 16 units group by one remote control a Function One r...

Page 37: ...ion operates that unit stops with the anomalous stop but any other normal units continue to run as they are d 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 lay connect with sires wiring between rooms using terminal blocks X Y of interface kit Connect the remote control communication wire separately...

Page 38: ...tting temperature Cooling Heating SP 1 SP 1 Unit Keep operation b SRK ZR series i Determination of operation mode The unit checks the indoor air temperature and the outdoor air temperature determines the operation mode and then begins in the automatic operation ii The unit checks the temperature every hour after the start of operation and if the result of check is not same as the previous operatio...

Page 39: ...se of 30 sec or ove Notes 1 When the outdoor heat exchanger temperature is in the range of P2 P3䉝 the speed is reduced by 8 rps at each 20 seconds 2 When the temperature is P3䉝㻌or higher the compressor is stopped 3 When the outdoor heat exchanger temperature is in the range of P1 P2䉝 if the compressor speed is been maintained and the operation has continued for more than 20 seconds at the same spe...

Page 40: ... Upper limit of compressor s speed RangeA 50 rps RangeB 30 rps Indoor fan Adaptable to compressor speed Hi Upper limit of compressor s speed RangeA 70 rps RangeB 30 rps Indoor fan Adaptable to compressor speed Note 1 Ranges A and B are as shown below Humidity 68 73 Range A Range B 2 When this control has continued for more than 30 minutes continuously the following wind direction control is per fo...

Page 41: ...at other than the vertical swing the flaps change to the horizontal position iii Reset conditions When either of the following conditions is satisfied 1 Compressor s command speed is less than 20 rps 2 Detected value of humidity is less than 63 13 Outline of dehumidifying DRY operation The purpose is Dehumidification and not to control the humidity to the target condition Indoor outdoor unit contr...

Page 42: ...exchanger temperature i Maximum required frequency is selected according to the outdoor unit heat exchanger temperature Tho R during cooling dehumidifying or according to the indoor unit heat exchanger temperature Thi R during heating mode ii When there are 3 indoor unit heat exchanger temperatures Thi R whichever the highest applies Unit rps Model 100 125 140 Max required frequency Cooling dehumi...

Page 43: ...ondition Upon establishing the conditions of compressor protection start III the low frequency operation control is performed during cooling dehumidifying Control contents Starts with the compressor s target frequency at A rps When the outdoor air temperature Tho A is 35 C or higher it starts at C rps At 30 seconds after the compressor start the compressor s target frequency is changed to B rps an...

Page 44: ... tap control during heating operation Fan taps are selected depending on the outdoor unit heat exchanger temperature Tho R1 R2 and the outdoor air temperature Tho A Note 1 It is detected by Tho R1 or R2 whichever the lower zone zone zone zone Tap 3 Tap 3 Tap 4 zone Tap 3 Tap 4 1 Tap 5 zone Tap 4 Tap 5 Tap 6 3 9 12 15 2 0 1 3 Outdoor air temperature C Outdoor unit heat exchanger temperature C zone ...

Page 45: ...umulative compressor operation time after the start of heating operation remote control ON has elapsed 30 minutes 2 After 5 minutes from the compressor ON 3 After 5 minutes from the start of outdoor fan 4 After satisfying all above conditions if temperatures of the outdoor unit heat exchanger temperature sensor Tho R1 R2 and the outdoor air temperature sensor Tho A become lower than the defrost op...

Page 46: ...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 pressure protection i Protective control a When the outdoor air temperature Tho A is 40 C or higher and the outdoor unit heat exchanger temperature Tho R exceeds the setting value the compressor speed frequency is controlled to suppress the rise of high pressu...

Page 47: ... 13 5 23 0 12 5 22 0 Secandary current side 100 12 0 Fig C 11 0 A 1 12 0 23 11 0 22 125 140 12 0 Fig C 11 0 A 1 12 0 23 11 0 22 Note 1 Value in are for the single phase models 12 10 14 16 18 20 22 24 50 40 60 70 80 90 100 110 120 130 Control or reset value A Compressor speed frequency rps Fig C The control value A and the reset value vary depending on the compressor speed Outdoor air temp 35 Outdo...

Page 48: ...5 Retention Reduces compressor frequency at each minute Reset Indoor unit heat exchanger temperature C iii Regarding the anti frost control by the operation stop refer to the operation control function by the indoor unit control and the cooling dehumidifying frost prevention of page 21 k Dewing prevention control Control condition During cooling and dehumidifying operation if all the following con...

Page 49: ... or higher the compressor stops ii When the fan motor speed drops to 100 min 1 or under 5 times within 60 minutes and the compressor stops it enters the anomalous stop mode with E48 displayed on the remote control o Anomalous stop by the compressor start stop i When it fails to shift to the compressor DC motor s rotor position defection operation at 5 seconds after establishing the compressor star...

Page 50: ...s Stop control is initiated depending on any of the following conditions i Suction pipe temperature of 38 7 C or lower is detected for 5 seconds continuously a Red LED Light Green LED Flashing Remote control Displays stop b It is possible to restart when the suction pipe temperature of 38 7 C or higher c Electronic expansion valve cooling heating is kept fully open ii Stop by the error detection c...

Page 51: ...rol PCB on the way of power source Replacement Fuse Blown fuse 1 time flash Keeps flashing Stays OFF Keeps flashing Indoor heat exchanger tempera ture sensor Defective indoor heat exchanger temperature sensor defective element broken wire short circuit Poor contact of temperature sensor connector Replacement repair of temperature sensor 101 Indoor unit control PCB Defective indoor unit control PCB...

Page 52: ...unit control PCB on the way of power source defective communication circuit Replacement of PCB ON ON ON Stays OFF Outdoor unit control PCB Defective outdoor unit control PCB on the way of power source Replacement Fuse Blown fuse Stays OFF Keeps flashing Number of con nected indoor units When multi unit control by remote control is performed the number of units is over Repair ON Stays OFF Keeps fla...

Page 53: ...on Repair 118 Outdoor unit control PCB Defective outdoor unit control PCB Defective 63H input circuit Replacement of PCB Stays OFF Keeps flashing 1 time flash Keeps flashing Outdoor unit control PCB compressor Current cut Anomalous compressor over current Replacement of PCB 119 120 Installation or operating condition Service valve closing operation Repair Stays OFF Keeps flashing 1 time flash Keep...

Page 54: ...tion Repair Keeps flashing Inverter PCB Anomalous inverter PCB Replacement of PCB Keeps flashing Suction pipe temperature sensor Defective suction pipe temperature sensor broken wire or poor connector connection Replacement repair of temperature thermistor Outdoor unit control PCB Defective outdoor unit PCB Defective sensor input circuit Replacement of control PCB Keeps flashing Operation status S...

Page 55: ...cted indoor units is detected after power ON Return air temperature sensor anomaly 50 C or 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 ...

Page 56: ...l 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 ە Read the SAFETY PRECAUTIONS carefully first of all and then strictly follow it during the replacement in order to protect yourself ە The precautionary items mentioned belo...

Page 57: ...ber CNT2 Red CNWR White SW2 SW7 SW6 LED3 SW5 Supplied jumper connector Reactor LED2 Green Red 1 Model FDT series a Replace the control PCB i Unscrew terminal Arrow A of the E1 wiring yellow green that is connected to PCB ii Replace the PCB only after all the wirings connected to the connector are removed iii Fix the board such that it will not pinch any of the wires iv Switch setting must be same ...

Page 58: ...ed in iv Control PCB Parts mounting 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 ...

Page 59: ...er 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 pump motor test run SW6 ON 1 2 3 4 Example setting for 50VH SW6 1 2 3 4 SW6 1 2 3 4 100VH 〇 〇 〇 125VH 〇 〇 140VH 〇 〇 〇 50VH 〇 〇 60VH 〇 〇 〇 71VH 〇 〇 Part number SW5 Master Slave setting SW2 Blue Address setting CNI Blue Floa...

Page 60: ... White Terminal block CNM1 White Fan motor1 CNW1 White Control PCB CNW0 White Terminal block CNM2 Black Fan motor2 CNWR White Reactor Models FDUM60VH 71VH1 100VH 125VH 140VH 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 co...

Page 61: ...tor 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 FDE50 140VH FDUM50VH Part number CNM1 White Fan motor CNW1 White Control PCB CNW3 White Terminal block CNW0 White Terminal block PSB012D992 C ...

Page 62: ...lid Invalid Normal Invalid See table 2 Model selection As per model See table 1 Remark Address No setting at plural indoor units control by 1 R C 0 F Switch Description Default setting Master Slave setting Master Slave Table 1 Indoor unit model selection with SW6 1 SW6 4 50VH 60VH 71VH 100VH 125VH 140VH SW6 4 SW6 1 SW6 2 SW6 3 Table 2 Indoor unit Master Slave setting with SW5 1 SW5 2 SW5 1 SW5 2 S...

Page 63: ...tage connected for the power source With the power off do the flaps open manually then close again when the power is turned on Replace the indoor printed circuit board and perform an operation check Make sure the correct volt age is connected then per form an operation check Is the current fuse on the in door unit s board broken Proceed to the indoor printed circuit board check If the package comp...

Page 64: ... 25 20 15 10 5 30 20 10 40 50 60 70 0 10 Indoor fan motor error Broken sensor wire connector poor connection Defective fan motor connector poor connection defective indoor unit PCB 65 for the fan motor and indoor unit PCB check unit 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 pr...

Page 65: ... 19 PAC SM 309 64 Error of signal transmission Wiring error including power cable defective indoor outdoor unit PCB unit unit unit ...

Page 66: ... terminal blocks and AC 220 230 240 V Indoor electrical components are normal Is the voltage between terminal blocks and oscillating between 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 2 Indoor fan motor check procedure a Indoor unit PCB output check DC15V Indoor unit PCB DC 308 336V DC several V 4 6 V CN...

Page 67: ...lace the indoor unit PCB and the fan motor Check then the operation Faulty part other than fan motor YES Fan 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 Is the fuse blown on the indoor unit PCB Is there any faulty part fan motor etc Replace ...

Page 68: ...ssed since power shut down and 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 cont...

Page 69: ...voltage It is very dangerous to touch the main PCB in this condition In the situation that hamesses are connected to main PCB be sure to measure voltage DC on main PCB and check that the voltage is discharged sufficientlv DC voltage 30 V or less Refer to Fig 2 c Disconnect the connectors faston terminals and round terminals from the main PCB as shown in Fig 2 And then remove the fixing screws 3 pl...

Page 70: ... 19 PAC SM 309 69 LED2 Red LED1 Green ...

Page 71: ...the heat conduction sheet on the aluminum block Refer to Fig 5 c Install the attached hamess clip on the new main PCB as shown in Fig 6 3 Installation a Install the new main PCB on the control and tighten the screw as shown in Fig 7 b Reconnect the connectors faston terminals and round terminals to the main PCB as before Refer to Fig 2 Confirm that the connectors are not half inserted ...

Page 72: ... 19 PAC SM 309 71 ...

Page 73: ...voltage It is very dangerous to touch the main PCB in this condition In the situation that hamesses are connected to main PCB be sure to measure voltage DC on main PCB and check that the voltage is discharged sufficientlv DC voltage 30 V or less Refer to Fig 2 c Disconnect the connectors faston terminals and round terminals from the main PCB as shown in Fig 2 And then remove the fixing screws 3 pl...

Page 74: ... 19 PAC SM 309 73 LED2 Red LED1 Green ...

Page 75: ... and paste the heat conduction sheet on the aluminum block Refer to Fig 5 3 Installation a Install the new main PCB on the control and tighten the screw as shown in Fig 6 b After the new Main PCB is installed on the control reconnect the connectors faston terminals and round terminals to the main PCB as before Refer to Fig 2 Confirm that the connectors are not half inserted ...

Page 76: ... 19 PAC SM 309 75 ...

Page 77: ...lization of existing piping control Reserved Reserved Hight difference of IU and OU control SW6 2 SW6 3 SW6 4 SW7 1 SW7 2 SW7 3 OFF OFF OFF OFF OFF OFF OFF OFF OFF Normal Normal Normal Keep OFF Keep OFF Keep OFF Keep OFF Keep OFF See table1 Normal Check INV Normal connected external device Normal Silent mode Reserved Reserved Reserved Reserved Reserved Inverter checker mode SW1 function selection ...

Page 78: ...there is any anomaly If the unit having anomaly is selected on the Select IU screen Loading Wait a while is displayed followed by the operation data at the occurrence of anomaly Contents of display Indoor unit No Error code Number and data item 2 When there is no anomaly No anomaly is displayed ant this mode is terminated Note 1 When the number of connected units cannot be shown in a page select N...

Page 79: ...harge pipe temperature protection control P 45䠈䠄㻢䠅 a i 2 Discharge pipe temperature anomaly P 45䠈䠄㻢䠅 a ii 3 Current safe 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 45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 j 9 C...

Page 80: ...oor inverter PCB was turned ON 2 After 15 seconds since power has turned ON LED start ON OFF for 5 seconds cyclically and it repeats 10 times 3 Check ON OFF status of 6 LED s on the checker 4 Judge the PCB by ON OFF status of 6 LED s on the checker 5 Be sure to turn off SW6 4 on outdoor inverter PCB after finishing the check operation ON OFF status of LED If all of LED are ON OFF according to foll...

Page 81: ...reactor continuity check Max 25mΩ LED2 Red LED1 Green LED2 Red check 1 5 time flash Refer to page 52 53 Must be conductive When fuse is blown replace it or check wiring When the outdoor unit fan motor is abnormal Refer to page 122 165 Models FDC100 125 140VNA W Outdoor unit check points Check items with the mark when the power is ON 7 Outdoor unit control failure diagnosis circuit diagram ...

Page 82: ...should be continuity There should be no shorts between phases DC reactor contiuity check 55mΩ or less LED2 Red LED1 Green LED2 Red check 1 5 time flash Refer to page 52 53 When the outdoor unit fan motor is anomalous Refer to page 122 165 FDC100 125 140VSA W Outdoor unit check points Check items with the mark when the power is ON ...

Page 83: ...overload operation 103 E9 Drain trouble FDT FDTC FDU FDUM series 104 E10 Excessive number of connected indoor units more than 17 units by controlling with one remote control 105 E11 Address setting error of indoor units 106 E14 Communication error between master and slave indoor units 107 E16 Indoor fan motor anomaly 108 E18 Address setting error of master and slave indoor unit 109 E19 Indoor unit...

Page 84: ... exchanger temperature sensor anomaly 149 None Room temperature sensor anomaly 150 E10 Excessive number of connected indoor units more than 17 units by controlling with one remote control 151 E11 Address setting error of indoor units 152 E14 Communication error between master and slave indoor units 153 E16 Indoor fan motor anomaly 154 E28 Remote control temperature sensor anomaly 155 E35 Cooling o...

Page 85: ...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 to install additional unit Compressor refrigerant oil protection control at starting is activated For the contents of control refer to the compressor start cont...

Page 86: ...ormal 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 to install additional unit Compressor refrigerant oil protection control at starting is activated For the contents of control refer to the compressor start control of the microcomputer control functi...

Page 87: ... compressor When the earth breaker is activated at lower insulation resistance check the following points 6 hours after power ON check if the insulation resistance recovers to normal When power ON crankcase heater heat up compressor and evaporate the refrigerant migrated in the compressor Check if the earth leakage breaker is conformed to higher harmonic regulation or not Since the unit is equippe...

Page 88: ...tting 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 or motor and specify the contacting point and correct it ...

Page 89: ...cur 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 blowing sound It may accompany also the hissing sound...

Page 90: ...y 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 Indoor outdoor temperatures pressure Time it occurred ...

Page 91: ...or 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 Defective LM LM wire breakage Faulty indoor unit control P...

Page 92: ...rminal block of indoor unit NO YES NO Is AC380 415V for 3 phase unit detected between 1 2 and 3 on the teminal block of outdoor unit or isAC220 240V for 1 phase unit detected between 1 and 2 on the terminal block of outdoor unit YES Defective outdoor unit main PCB Noise filter Misconnection or breakage of connecting wires Defective indoor unit control or power PCB Replace Replace fan motor louver ...

Page 93: ...age between X and Y 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 Remote control wire breakage Replace remote control Malfunction by temporary noise Defective indoor unit control PCB Replace Remote control wire breakage Replace remote contr...

Page 94: ... source reset NO YES YES NO NO NO NO NO YES YES YES Set one remote control for Master and the other for Slave Set SW1 on remote control PCB at Master 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 control Change 2 Error detection method Communication between indoor unit and remote con...

Page 95: ...s after 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 main 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 tha...

Page 96: ... 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 Y Replace Correct connection wires between indoor and outdoor units Defective outdoor unit main PCB Replace Defective connection wire Broken N...

Page 97: ...30A blown Note 1 1 phase model only FDC100 140 VSA W are except NO YES NO Is AC220 240V or AC380 415V detected at the noise filter secondary side Isn t fuse 250V 2A on the outdoor main PCB blown NO YES Is DC15V detected if the connector of outdoor fan motor is disconnected NO 1 To next page From previous page Normal Malfunction by noise Replace noise filter Defective outdoor unit main PCB Replace ...

Page 98: ... Replace the main PCB Replace the reactor Replace the power source fuse Isn t there a short circuit between phases of the noise filter Isn t there a short circuit between phases of outdoor unit main PCB input terminals Isn t there any crack burning on the power transistor module Is the reactor OK From previous page 2 Error detection method 3 Condition of error displayed 4 Presumable cause Blown fu...

Page 99: ...remote control wires if the remote control is removed Are wires connected properly between the indoor outdoor units NO 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 Presumable cause Faulty indoor unit control PCB Defective...

Page 100: ...ion 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 displayed Same as above 4 Presumable cause Defective communicati...

Page 101: ... 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 2 Error detection method When normal communication between indoor and outdoor unit is interrupted for more than 2 minutes 3 Condition of error displayed Same as above is detected during operation 4 Presumable c...

Page 102: ...indoor 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...

Page 103: ...cuit Correct 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 fo...

Page 104: ...ture too high 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 Check refrigerant system Adjust 2 Error detection method Indoor heat exchanger temperature s...

Page 105: ...logged Is the drain 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 motor Correct Check drain pump motor 2 Error detection method Float switch is activated 3 Condition of ...

Page 106: ...pplicable model 5 Troubleshooting All models Diagnosis Countermeasure Aren t 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...

Page 107: ...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 used E11 occurs YES IU IU IU R C In case the wir...

Page 108: ...power source 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 bet...

Page 109: ...k 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 actual rotation speed of indoor fan motor drops to lower than 200min 1 for 30 seconds ...

Page 110: ...oting All models 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 co...

Page 111: ...ndoor 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 M...

Page 112: ...al Replace the 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...

Page 113: ... 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 ...

Page 114: ...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 main PCB Replace Excessive refrigerant amount Recharge refrigerant by weighting proper amount on a scale 2 Error detection method For the error detection method refer to the protective ...

Page 115: ...n PCB Replace Check unit side Isn t filter clogged Are adequate indoor outdoor unit installation spaces 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 the protective control by controlling compressor rotation speed and cooling high pressure protective control of micro computer control f...

Page 116: ...t exchanger temperature sensor input circuit 2 Error detection method Detection of 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 minute delay the compresso...

Page 117: ...it Correct connector Defective outdoor air temperature sensor Replace Defective outdoor unit 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 continuously within 2 minutes...

Page 118: ...mperature sensor resistance kΩ Temperature C Broken wire Short circuit Correct connector Defective discharge pipe temperature sensor Replace Defective outdoor unit main PCB Replace Defective temperature sensor 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...

Page 119: ... source breaker is turned OFF and ON too quickly E40 may be displayed This is normal NO YES If any anomaly exists on the electronic expansion valve connector connection the power source must be reset NO Open the service valve Correct 63H1 connector Correct electronic expansion valve connector Defective outdoor unit main PCB Replace Defective 63H1 input circuit 2 Error detection method When the hig...

Page 120: ...the service valves 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 compresser 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 ...

Page 121: ...an motor run Are the service valves fully opened Is the filter clogged Is there any liquid flooding Is the superheat within normal range Is the low pressure sensor and suction pipe temperature sensor normal Is there any anoumalous sound on the compressor YES YES From previous page Defective outdoor unit main PCB Replace Defective outdoor unit main PCB Replace 2 Error detection method In order to p...

Page 122: ... error displayed 4 Presumable cause Defective main PCB Note In order to avoid an unexpected trouble if the protective circuit defect unexpected voltage current and movement of the power element it makes the compressor stopping If the anomaly occurs it makes the compressor stopping After 3 minute delay the compressor restarts f this anomaly occurs 4 times within 30 minutes or continues for 15 minut...

Page 123: ...ection method Detected by rotation speed of outdoor fan motor 3 Condition of error displayed When actual rotation speed of outdoor fan motor FMo1 drops to 100min 1 or lower for 30 minutes continuously the compressor and the outdoor fan motor stop 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 De...

Page 124: ... condition open to atmosphere To next page Correct Replace low pressure sensor Defective outdoor unit main PCB Replace Replace low pressure sensor 2 Error detection method Detected by low pressure 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 ...

Page 125: ...K Is the low pressure normal during operation From previous page Open fully Correct Defective low pressure sensor suction pipe temperature sensor Replace Charge refrigerant Defective outdoor unit main PCB Replace Defective low pressure sensor suction pipe temperature sensor circuits 2 Error detection method 3 Condition of error displayed 4 Presumable cause Note Low pressure error 2 2 Error code Re...

Page 126: ...licable model 5 Troubleshooting All models Diagnosis Countermeasure Models FDC100 140VNA W VSA W Replace immediately the main PCB 2 Error detection method When power transistor anomaly is detected for 15 minutes continuously 3 Condition of error displayed Same as above 4 Presumable cause Outdoor fan motor anomaly Outdoor unit main PCB anomaly Note Inverter and fan motor anomaly ...

Page 127: ...temperature sensor connector Defective suction pipe temperature sensor Replace Defective outdoor unit main PCB Replace Defective suction pipe temperature sensor input circuit 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...

Page 128: ...ircuit OK 2 Error detection 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 minute...

Page 129: ...frigerant Defective indoor unit control PCB Replace Defective indoor heat exchanger return air temperature sensor input circuits 2 Error detection method Judge insufficient refrigerant amount by detecting the temperature differnce between indoor heat exchanger Thi R and indoor return air Thi A It detects at initial startup in cooling or dehumidifying mode after power ON 3 Condition of error displa...

Page 130: ...for rotor position detection of compressor motor 3 Condition of error displayed If the compressor fails to startup for 20 times 10 patterns x2 times continuously 4 Presumable cause Outdoor fan motor anomaly Outdoor unit main PCB anomaly Anomalous power source voltage Insufficient or excessive refrigerant amount Faulty component for refrigerant circuit Compressor anomaly Motor or bearing Note Insul...

Page 131: ...After power OFF turn SW6 4 of outdoor unit main PCB ON and connect the outdoor unit main checker Then power ON again Try to restart several times From previous page Replace outdoor unit main PCB Replace outdoor unit main PCB Replace compressor 2 Error detection method When it fails to change over to the operation for rotor position detection of compressor motor 3 Condition of error displayed If th...

Page 132: ...O Is the 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 to install additional unit Compressor refrigerant oil protection control at starting is activated For the content...

Page 133: ...e compressor operating 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 to install additional unit Compressor refrigerant oil protection control at starting is activated For the contents of con...

Page 134: ...ulation 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 6 hours after power ON check if the insulation resistance recovers to normal When power ON crankcase heater heat up compressor and evaporate the refrigerant migrated in the compressor Check if the earth leakage break...

Page 135: ... rubber cushions or others into 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 ano...

Page 136: ... or liquid flow through inside 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 p...

Page 137: ...ent charge of refrigerant Intrusion 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 duri...

Page 138: ...ng broken 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 Presumabl...

Page 139: ... OK 250V 3 15A YES YES NO Is AC380 415V for 3 phase unit detected between 1 2 and 3 on the teminal block of outdoor unit or isAC220 240V for 1 phase unit detected between 1 and 2 on the terminal block of outdoor unit YES Defective outdoor unit main PCB Noise filter Misconnection or breakage of connecting wires Replace fuse Defective indoor unit control PCB Replace 2 Error detection method 3 Condit...

Page 140: ...ort circuited Disconnect remote control wires NO Is DC15V or higher detected between X Y of interface kit terminal block YES YES YES NO Disconnect connecting wires Is DC15V or higher detected between X Y of indoor unit terminal block YES NO NO Correct Replace wires Replace remote control Replace interface kit Defective indoor unit control PCB Replace 2 Error detection method 3 Condition of error d...

Page 141: ...ctly Are limit switch OK Note 1 Check the operation of limit switch by checking if the error can be rest or not by pushing the limit switch by finger when the inlet panel is removed YES Correction re set Defective limit switch Replace Defective indoor unit control PCB Replace Defective limit switch input circuit 2 Error detection method The limit switch operates when the indoor unit is stopped 3 C...

Page 142: ...r Master and the other for Slave Is approx DC20V detected between on the interface kit terminal block Is approx DC20V detected between on the remote control terminal block YES YES NO NO Set SW1 on remote control PCB at Master Set address again SW3 on interface kit PCB Separate remote control wires from high voltage wires Defective interface kit PCB Replace Broken connecting wire Correct Defective ...

Page 143: ...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 main PCB Faulty interface kit 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...

Page 144: ...ween indoor outdoor units YES YES 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 remote control Replace Broken remote control wire Y Replace Correct connection wires between indoor and outdoor units Defective outdoor unit main PCB ...

Page 145: ...e model only NO YES YES YES NO IsAC220 240V orAC380 415V detected at the noise filter secondary side Isn t fuse 250V 2A on the outdoor unit main PCB blown NO YES Is DC5V detected on the outdoor unit main 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 Rep...

Page 146: ...heck for outdoor unit main PCB before replacement of blown power source fuse Replace the main PCB Replace the reactor Replace the power source fuse Isn t there a short circuit between phases of the noise filter Isn t there a short circuit between phases of outdoor unit main PCB input terminals Isn t there any crack burning on the power transistor module Is the reactor OK From previous page 2 Error...

Page 147: ... control is removed NO NO YES YES YES IsDC10Vor higherdetectedatinterfacekitconnection terminals Is DC10V or higher detected on connecting wires if the interface kit is removed Are wires connected properly between the indoor outdoor units NO Defective remote control Defective remote control Defective interface kit Defective interface kit Defective connecting wire Defective remote control wire Shor...

Page 148: ... interface kit is removed Are wires connected properly between the indoor outdoor units NO NO Malfunction by noise Check peripheral environment Defective remote control Defective remote control Defective interface kit Defective interface kit Defective connecting wire Defective remote control wire Short circuit etc Defective indoor unit control PCB Replace 2 Error detection method When normal commu...

Page 149: ...ck for faulty connection 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 times Repair signal wires Repair signal wires To the diagnosis of WAIT Unit is normal Malfunction by temporary noise etc Defective outdoor unit main PCB Defective network communication circuit Replace Unit is normal Malfunction by temporary noise et...

Page 150: ...n wire Short circuit 5kΩ at 25 C Correct Insert connector securely Defective indoor heat exchanger temperature sensor Replace Defective indoor unit control PCB Replace Defective indoor unit heat exchanger temperature sensor input circuit 2 Error detection method Anomalously low temperature or high temperature resistance is detected on the indoor heat exchanger sensor Th21 Th22 3 Condition of error...

Page 151: ... 25 C Broken wire Short circuit Correct Connect connector Defective room temperature sensor Replace Defective indoor unit control PCB Replace Defective room temperature sensor input circuit 2 Error detection method Anomalously low temperature or high temperature resistance is detected by indoor room temperature sensor Th1 3 Condition of error displayed When the temperature sensor detects 45 C or l...

Page 152: ...Stays OFF 1 Applicable model 5 Troubleshooting All models Diagnosis Countermeasure Aren t 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...

Page 153: ...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 Indoor unit 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 used E11 occurs YES In case the wiring ...

Page 154: ...ng the power source Note 1 Set DIP switches SW3 1 and SW3 2 as shown in the following table Factory default setting Master Master Slave1 Slave2 SW3 1 OFF OFF ON SW3 2 OFF ON OFF DIP switch Interface kit YES NO NO YES Correct unit address setting Correct wiring Correct wiring Defective indoor unit control PCB Replace Malfunction by noise Check surrounding environment 2 Error detection method When c...

Page 155: ...S 1 Note 1 for GND NO Power source reset Remove foreign material Replace the fan motor Replace 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 ...

Page 156: ...he compressor stops After 3 minutes 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 sensor was switched from valid to inva...

Page 157: ...door heat exchanger temperature thermistor 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 main PCB Replace Excessive refrigerant amount Recharge refrigerant by weighting proper amount on a scale 2 Error detection method For the error detec...

Page 158: ...efective outdoor unit main PCB Replace Check unit side Isn t filter clogged Are adequate indoor outdoor unit installation spaces 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 the protective control by controlling compressor rotation speed and cooling high pressure protective control of...

Page 159: ...on method Detection of 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 minute delay the compressor starts again automatically but if this anomalous temperatu...

Page 160: ...e outdoor air temperature sensor Replace Defective outdoor unit 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 continuously within 2 minutes to 2 minutes 20 seconds afte...

Page 161: ...ristics Temperature sensor resistance kΩ Temperature C Broken wire Short circuit Correct connector Defective discharge pipe temperature sensor Replace Defective outdoor unit main PCB Replace Defective temperature sensor 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 temperat...

Page 162: ...lve connector connection the power source must be reset NO Open service valve Correct 63H1 connector Correct electronic expansion valve connector Defective outdoor unit 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...

Page 163: ...source Open the valves 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 compresser 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...

Page 164: ...w pressure sensor and suction pipe temperature sensor normal Is there any anoumalous sound on the compressor YES YES From previous page Defective outdoor unit main PCB Replace Defective 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 t...

Page 165: ... of error displayed 4 Presumable cause Defective main PCB Note In order to avoid an unexpected trouble if the protective circuit defect unexpected voltage current and movement of the power element it makes the compressor stopping If the anomaly occurs it makes the compressor stopping After 3 minute delay the compressor restarts f this anomaly occurs 4 times within 30minutes or continues for 15minu...

Page 166: ...or fan motor FMo1 drops to 100min 1 or lower for 30 minutes continuously the compressor and the outdoor fan motor stop 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 main PCB Foreign material at rotational area of fan propeller Defective fan motor Dust on outdoor unit main...

Page 167: ...method Detected by low pressure 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 minutes delay And if this anomaly occurs 5 times within 60 minutes 10 minutes after the compressor starts if the low pressure sensor detects 0 15MPa or lower for 60 minutes...

Page 168: ... sensor suction pipe temperature sensor OK Is the low pressure normal during operation From previous page Open fully Correct Defective low pressure sensor suction pipe temperature sensor Replace Charge refrigerant Defective outdoor unit main PCB Replace Defective low pressure sensor suction pipe temperature sensor circuits 2 Error detection method 3 Condition of error displayed 4 Presumable cause ...

Page 169: ...hen power transistor anomaly is detected for 15 minutes continuously 3 Condition of error displayed Same as above 4 Presumable cause Defective outdoor fan motor Defective outdoor unit main PCB Note Error code Remote control Content 1 time flash Keeps flashing 4 time flash ON Indoor display RUN light TIMER light Green LED Red LED Outdoor unit control PCB Inverter and fan motor anomaly ...

Page 170: ... input circuit 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 ...

Page 171: ...nput circuit OK 2 Error detection method When anomalous voltage pressure is detected 3 Condition of error displayed If the pressure sensor detects 0V or lower and 4 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 minu...

Page 172: ...udge insufficient refrigerant amount by detecting the temperature differnce between indoor heat exchanger Th2 and indoor room Th1 It detects at initial startup in cooling or dehumidifying mode after power ON 3 Condition of error displayed Anomalous stop at initial detection 4 Presumable cause Defective indoor heat exchanger temperature sensor Defective indoor room temperature sensor Defective indo...

Page 173: ...imes continuously 4 Presumable cause Faulty outdoor fan motor Faulty outdoor unit main PCB Anomalous power source voltage Insufficient or excessive refrigerant amount Faulty component for refrigerant circuit Compressor anomaly Motor or bearing Note Insulation resistance The unit is left for long period without power source or soon after installation insulation resistance may decrease to several MΩ...

Page 174: ...d connect the outdoor unit main checker Then power ON again Try to restart several times From previous page Replace outdoor unit main PCB Replace outdoor unit main PCB Replace compressor 2 Error detection method 3 Condition of error displayed 4 Presumable cause Faulty outdoor fan motor Faulty outdoor unit main PCB Anomalous power source voltage Insufficient or excessive refrigerant amount Faulty c...

Page 175: ...sensor holder DISASSEMBLY PROCEDURE PROCEDURE PICTURES FDT series PJF012D045 1 1 3 DISASSEMBLY PROCEDURE 1 Indoor unit a FDT series PJF012D045 Precautions for safety Read these Precautions for safety carefully before starting disassembly work and do it in the proper way When disassembling be sure to turn off the power When disassembling the electrical components check the electrical wiring diagram ...

Page 176: ...ve it mark 3 Remove 3 heat exchanger assembly fixing screws and remove it mark 8 To remove the Electronic Expansion Valve EEV 1 Remove the heat exchanger assembly See No 7 2 Remove the coil of EEV by pull out on the top 3 Remove welded part of EEV by welding mark PROCEDURE PICTURES PJF012D045 EEV Coil of EEV General view 2 Pipe lid ...

Page 177: ...otor FM 1 Remove 4 bellmouth fixing screws then remove the bellmouth mark 2 Remove the turbo fan fixing nut then remove the turbo fan mark 3 Remove 2 plate fixing screws then remove the plate mark 4 Disconnect the motor connector CNMx in the middle of wiring 5 Remove 3 motor fixing nuts then remove the motor mark 4 To remove the drain pan 5 To remove drain pump DM and float switch FS 1 Remove the lid o...

Page 178: ... No 4 2 Remove 2 pipe lid fixing screws then remove the pipe lid mark 3 Remove the fan motor wiring from clip and grommet mark 4 Remove 3 heat exchanger assembly fixing screws then remove the heat exchanger assembly mark 8 To remove the Electronic Expansion Valve EEV 1 Remove the heat exchanger assembly See No 7 2 Remove the damper sealant from EEV 3 Remove the coil of EEV by pull out on the top 4 R...

Page 179: ...ark and remove it Power PCB 4 Take off 6 power PCB fixing locking supports mark and remove it 3 To remove the bottom panel B 1 Remove 18 panel fixing screws and remove it 5 To remove the motor PCB 4 To remove the impellers and motors FM 1 Remove the lid of control box 1 Remove the lid of control box See No 1 See No 1 2 Remove the bottom panel B See No 3 2 Remove the bottom panel B 3 Disconnect the mo...

Page 180: ...e the bottom panel B See No 3 2 Remove 22 bottom panel F fixing screws and remove it mark 3 Remove 2 drain pan fixing screws and remove it mark 4 Remove 4 heat exchanger assy fixing screws and remove it mark 9 To remove the Electronic Expansion Valve EEV 1 Remove the heat exchanger assembly See No 8 2 Remove the coil of EEV by pull out on the top 3 Remove welded part of EEV by welding mark 10 To remo...

Page 181: ...k 2 To remove the lid of control box 1 To remove air inlet grille See No 1 2 Remove 2 wire fixing screws and remove it mark 3 Remove 2 lid fixing screws and remove it mark 3 To remove the control box 1 Remove the lid of control box See No 2 2 Pull off all the inserted connectors 3 Remove 2 control box fixing screws and remve it mark 4 Pull out the control box 4 To remove the printed circuit board PCB ...

Page 182: ...xchanger assy fixing screws and remove it mark 9 To remove the louver motor LM 1 Remove the lid of control box See No 1 2 Disconnect the louver motor connector CNJ on PCB in control box 10 To remove the thermistors example Thi R3 3 Remove side panel See No 5 1 Remove the lid of control box See No 1 4 Remove 2 louver motor fixing screws 2 Disconnect the Tho R3 connector CNNx and remove it on PCB in c...

Page 183: ... 19 PAC SM 309 182 1 e SRK series PHA012D402 ...

Page 184: ... 19 PAC SM 309 183 Screw ...

Page 185: ... 19 PAC SM 309 184 3 PHA012D402 ...

Page 186: ... 19 PAC SM 309 185 4 PHA012D402 ...

Page 187: ...ard fixing screws and remove it mark 4 Remove the propeller fan fixing nut and remove it mark 5 Remove 4 fan motor fixing nuts and remove it mark 3 To remove the electronic expantion valve EEV 1 Remove the service panel See No 1 2 Disconnect the EEV connector CNEEVx on PCB in control box 3 Remove the coil of EEV by pull out on the top 4 Remove welded part of EEV by welding mark 4 To remove the high p...

Page 188: ...CTURES PCA012D089A a b Terminal cover Control PCB Control Cupper NF PCB Front of controller Rear of controller 7 To remove the low pressure sensor PSL 1 Remove the service panel See No 1 2 Disconnect the PSL connector CNPSL on PCB in control box 3 Turn PSL unticlockwise and remove it Double spanners are needed Be sure to collect a refrigerant before remove the low pressure sensor 8 To remove the c...

Page 189: ...3 4 5 1 2 3 4 5 1 2 3 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 con...

Page 190: ... 18 19 20 BL RD 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 c...

Page 191: ...i1 2 FS Float switch Indication lamp Red Inspection Indication lamp Green Normal operation LED 3 LED 2 Connector CNB Z Model capacity setting SW6 Operation check drain pump motor test run SW7 1 SW5 Temperature sensor Remote control Temperature sensor Heat exchanger Temperature sensor Return air Thc Thi R1 2 3 TB2 Terminal block Signal line mark TB1 Terminal block Power source mark Remote control c...

Page 192: ... WH Power PCB Power 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 ...

Page 193: ... Prepare on site 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 ...

Page 194: ... 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 M 1 4 5 6 7 RD F3 2A CNM1 WH BL or BK BR or WH WH or BL OR or YE L CNWR WH 1 3 1 2 CNTA BL Remote operation input volt free contact 12 Prepare on site XR5 Remote operation input volt fre...

Page 195: ... 10 11 12 13 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 outdoo...

Page 196: ... 5 5 M 5 M 5 LEFT MOTOR LOUVER RIGHT MOTOR LOUVER RIGHT LOWER MOTOR FLAP UPPER MOTOR FLAP LEFT MOTOR INLET RIGHT MOTOR INLET SW LIMIT PANEL INLET MOTOR FAN STACK DIODE 1 3 EXCHANGER HEAT EXCHANGER HEAT Power source 1 Phase 220 240V 50Hz 220V 60Hz TO OUTDOOR UNIT CNJ 3 SENSOR ROOM TEMP SENSOR 1 HEAT EXCHANGER SENSOR 2 HEAT EXCHANGER SENSOR HUMIDITY SENSOR MOTION 3 1 CNZ CNX CNY CNM CNP Description ...

Page 197: ... 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 Terminal block ...

Page 198: ...length m indoor outdoor wire size x number Earth wire size mm the freezing point snowy country set this switch to ON SW3 3 4 when SW3 4 is OFF and heating trial High height difference unit by 30m or more installed at a position higher than indoor Set this switch to ON when outdoor unit is operation control external equipment operation by remote control connected Set this switch to ON when managing...

Page 199: ...switch should be turned ON in the area shorter by turning ON this switch The defrost operation interval becomes the freezing point snowy country set this switch to ON SW3 3 4 when SW3 4 is OFF and heating trial High height difference unit by 30m or more installed at a position higher than indoor Set this switch to ON when outdoor unit is operation control external equipment operation by remote con...

Page 200: ... Tho R2 ø9 52 Gas line ø15 88 Liquid line Muffler Control cooling Temperature sensor Return air Thi A or Th1 Temperature sensor Heat exchanger Thi R3 or Th22 Heat exchanger Indoor unit Indoor unit Outdoor unit Flare connecting Diameter joint of different Flare connecting Cooling cycle Heating cycle Gas branch pipe Liquid branch pipe ø9 52 ø9 52 ø6 35 50 60 only Gas line ø15 88 50 60 ø12 7 71 ø15 8...

Page 201: ...trainer Strainer Sub cooling coil Strainer Service valve Flare connecting 4 way valve Suction Muffler Discharge Compressor Check joint Check joint Check joint Accumulator Check valve Temperature sensor Tho R2 Muffler Control cooling Preset point of the protective devices Parts name Mark Equipped unit 100 125 140 model Temperature sensor for protection over loading in heating Thi R Tho A Indoor uni...

Page 202: ... 19 PAC SM 309 201 2 V MULTI SYSTEM CONTENTS 2 1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 202 2 2 MAINTENANCE DATA 202 2 3 DISASSEMBLY PROCEDURE 202 2 4 ELECTRICAL WIRING 202 2 5 PIPING SYSTEM 202 ...

Page 203: ...SM 309 202 2 1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER See page 5 2 2 MAINTENANCE DATA See page 50 2 3 DISASSEMBLY PROCEDURE See page 174 2 4 ELECTRICAL WIRING See page 188 2 5 PIPING SYSTEM See page 199 ...

Page 204: ...nt we reserve the right to make changes in all specifications without notice INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR CONDITIONERS Copyright MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS LTD Because of our policy of continuous improvement we reserve the right to make changes in all specifications without notice C MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS LTD 16 5 Konan 2 chome Minato ku Tokyo 10...