Daikin VRVII, Manual

Page 1: ...Pocket Manual Service Diagnosis Si30 701_A...

Page 2: ...bnormality 49 3 4 A6 Fan Motor M1F Lock Overload 52 3 5 A6 Indoor Unit Fan Motor Abnormality 55 3 6 A6 Overload Overcurrent Lock of Indoor Unit Fan Motor 57 3 7 A7 Swing Flap Motor M1S Abnormality 63...

Page 3: ...lve Coil Abnormality 130 3 30 F3 Abnormal Discharge Pipe Temperature 136 3 31 F6 Refrigerant Overcharged 143 3 32 H3 High Pressure Switch System Abnormality 148 3 33 H7 Outdoor Unit Fan Motor Signal A...

Page 4: ...ation Fin Thermistor Abnormality 239 3 57 PJ Field Setting Abnormality after Replacing Main PCB or Combination of PCB Abnormality 243 3 58 U0 Refrigerant Shortage Alert 250 3 59 U1 Reverse Phase Open...

Page 5: ...lication of Centralized Remote Controller 335 3 69 UE Transmission Error between Centralized Remote Controller and Indoor Unit 336 3 70 UF System is not Set yet 341 3 71 UH System Abnormality Refriger...

Page 6: ...Series Refrigerant Type Product Series Reference Page R 22 Air Cooled VRVII Inverter M A 2 VRVII S 3 R 410A VRVII 4 VRVII S 5 Water Cooled VRV WII 6 Air Cooled VRVIII Inverter P A 7 VRVIII Q 9 VRVIII...

Page 7: ...g Mounted Built in Type FXS 20L 25L 32L 40L 50L 63L 80L 100L 125L Ceiling Mounted Built in Type Rear Suction FXYB 20K 25K 32K 40K 50K 63K 80K 100K 125K V1 Ceiling Mounted Duct Type FXM 40L 50L 63L 80L...

Page 8: ...ling Mounted Low Silhouette Duct Type FXYD 20KA 25KA 32KA 40KA 50KA 63KA Ceiling Mounted Built in Type FXS 20L 25L 32L 40L 50L 63L 80L 100L 125L Ceiling Mounted Built in Type Rear Suction FXYB 20K 25K...

Page 9: ...pe FXMQ 40MA 50MA 63MA 80MA 100MA 125MA 200MA 250MA Ceiling Suspended Type FXHQ 32MA 63MA 100MA Wall Mounted Type FXAQ 20MA 25MA 32MA 40MA 50MA 63MA Floor Standing Type FXLQ 20MA 25MA 32MA 40MA 50MA 6...

Page 10: ...125M Ceiling Mounted Casette Corner Type FXKQ 25M 32M 40M 63M Slim Ceiling Mounted Built in Type L S P FXDQ 20N 25N 32N 40N 50N 63N Ceiling Mounted Built in Type M S P FXSQ 20M 25M 32M 40M 50M 63M 80M...

Page 11: ...VE 20NA 25NA 32NA 40NA 50NA 63NA FXDQ NVET 20N 25N 32N 40N 50N 63N Ceiling Mounted Built in Type FXSQ 20M 25M 32M 40M 50M 63M 80M 100M 125M Ceiling Mounted Duct Type FXMQ 40MA 50MA 63MA 80MA 100MA 125...

Page 12: ...32PB FXDQ PBVET 20PB 25PB 32PB FXDQ NBVE 40NB 50NB 63NB FXDQ NBVET 40NB 50NB 63NB Ceiling Mounted Built in Type FXSQ 20M 25M 32M 40M 50M 63M 80M 100MA 125M Ceiling Mounted Duct Type Middle and High S...

Page 13: ...48P A 50P A 52P A 54P A 5P 8P 10P 12P 14P 16P 18P 20P 22P 24P 26P TL E 28P 30P 32P 34P 36P 38P 40P 42P 44P 46P 48P 50P 52P 54P Cooling Only RXYQ 5P A 8P A 10P A 12P A 14P A 16P A 18P A 20P A 22P A 24P...

Page 14: ...VRV Series 9 2 5 VRVIII Q P Series Outdoor Units Type Model Name Symbol For Replacement Use RQYQ 8P 10P 12P 14P 16P Y1 18P 20P 22P 24P 26P 28P 30P 32P 34P 36P 38P 40P 42P 44P 46P 48P...

Page 15: ...20NA 25NA 32NA 40NA 50NA 63NA FXDQ NVET 20N 25N 32N 40N 50N 63N Ceiling Mounted Built in Type FXSQ 20M 25M 32M 40M 50M 63M 80M 100M 125M Ceiling Mounted Duct Type FXMQ 40MA 50MA 63MA 80MA 100MA 125MA...

Page 16: ...T 20PB 25PB 32PB FXDQ NBVE 40NB 50NB 63NB FXDQ NBVET 40NB 50NB 63NB Ceiling Mounted Duct Type Middle and High Static Pressure FXMQ 20P 25P 32P 40P 50P 63P 80P 100P 125P 140P Ceiling Mounted Duct Type...

Page 17: ...unit Remove obstacle s Clogged air filter s Clean the air filter s 3 The system does not cool or heat air well Blocked air inlet or outlet of indoor or outdoor unit Remove obstacle s Clogged air filt...

Page 18: ...power supply The system is in preparation mode of micro computer operation Wait for a period of approximately 1 minute 5 The system makes intermittent stops The remote controller displays error codes...

Page 19: ...oom temperature reaches the set degree the outdoor unit will stop while the indoor unit is brought to fan LL operation so that no one gets cold air Furthermore if fan operation mode is selected when o...

Page 20: ...or unit Clean the inside of the indoor unit Indoor unit Immediately after cooling operation stopping the ambient temperature and humidity are low Hot gas refrigerant flown in the indoor unit results t...

Page 21: ...when the gas refrigerant stops or changes flowing Normal operation Indoor unit Faint sounds are continuously produced while in cooling operation or after stopping the operation These sounds are produc...

Page 22: ...er is normal Normal operation This code is displayed for a period of approximately 1 minute at maximum 16 The outdoor unit compressor or the outdoor unit fan does not stop After stopping operation It...

Page 23: ...Inspection Test Operation button once Following codes can be checked Error codes Indoor model code Outdoor model code Inspection mode Press Inspection Test Operation button once Normal mode Test opera...

Page 24: ...or error code and error contents Note 1 Pressing the INSPECTION TEST button will blink the check indication 2 While in service mode holding down the ON OFF button for a period of 5 seconds or more wil...

Page 25: ...r the particular model 1 Checking an error or warning Operation Status Display Abnormal shutdown The system stops operating The operation lamp green starts to blink The message Error Press Menu button...

Page 26: ...roubleshooting by Remote Controller 21 2 Taking corrective action Press the Menu Enter button to check the error code Take the corrective action specific to the model Error code Applicable model names...

Page 27: ...buzzer remains ON The continuous buzzer indicates that the error code is confirmed Continuous beep No abnormality 3 Press the MODE selector button The left 0 upper digit indication of the error code...

Page 28: ...Press INSPECTION TEST button If no button is pressed for 1 minute equipment returns to normal status If no button is pressed for 1 minute equipment returns to normal status When MODE selector button...

Page 29: ...rmality h h h h h h h h h h h h h 46 A1 PCB Abnormality h h h h h h h h h h h h h 48 A3 Drain Level Control System S1L Abnormality h h h h h h h h 49 A6 Fan Motor M1F Lock Overload h h h 52 A6 Indoor...

Page 30: ...Determination Device Abnormality h h h h h h h h h h h h h 73 C4 Thermistor for Liquid Pipe Abnormality h h h h h h h h h h h h h 78 C5 Thermistor for Gas Pipe Abnormality h h h h h h h h h h h h h 8...

Page 31: ...CB Abnormality h h h h h h h h h h h h h 48 A3 Drain Level Control System S1L Abnormality h h h h h h 49 A6 Fan Motor M1F Lock Overload h h h 52 A6 Indoor Unit Fan Motor Abnormality h 55 A6 Overload O...

Page 32: ...lity between Indoor unit PCB and Fan PCB h 75 C4 Thermistor for Liquid Pipe Abnormality h h h h h h h h h h h h h 78 C5 Thermistor for Gas Pipe Abnormality h h h h h h h h h h h h h 80 C6 Combination...

Page 33: ...re Sensor h h h h 102 Abnormal Suction Pressure h h h h h 104 E5 Inverter Compressor Motor Lock h h h h 107 Inverter Compressor Motor Lock h h h 109 Inverter Compressor Motor Lock h h 112 E6 STD Compr...

Page 34: ...gnal Abnormality h h 150 Outdoor Unit Fan Motor Signal Abnormality h h 153 H9 Outdoor Air Thermistor Abnormality h h h 155 Outdoor Air Thermistor Abnormality h h h h 157 HJ Water system Error h h 159...

Page 35: ...Abnormality h h h h h h 185 JC Low Pressure Sensor Abnormality h h h 188 Suction Pipe Pressure Sensor Abnormality h h h h h h 191 L1 Inverter PCB Abnormality h 194 Inverter PCB Abnormality h 197 Inve...

Page 36: ...ontrol PCB h h 226 Transmission Error between Inverter and Control PCB h h h h h 229 Transmission Error between Inverter and Control PCB h h 231 P1 Inverter Over Ripple Protection h h h h 234 Inverter...

Page 37: ...lity after Replacing Main PCB or Combination of PCB Abnormality h h 249 U0 Refrigerant Shortage Alert h h h 250 Refrigerant Shortage Alert h h 253 Refrigerant Shortage Alert h h h h 256 U1 Reverse Pha...

Page 38: ...ansmission Error between Indoor Units and Outdoor Units h h 289 Transmission Error between Indoor Units and Outdoor Units h h h h h h 294 U5 Transmission Error between Remote Controller and Indoor Uni...

Page 39: ...321 Improper Combination of Indoor and Outdoor Units Indoor Units and Remote Controller h 325 Improper Combination of Indoor and Outdoor Units Indoor Units and Remote Controller h h h h h h 332 UC Ad...

Page 40: ...ion of the connector between the fan motor and the PCB for the fan If the connection is normal replace the fan motor If this still cannot solve the error replace the PCB for the fan A6 11 Fan position...

Page 41: ...amper rotation error when the self cleaning decoration panel is mounted The damper does not rotate normally Check for any foreign matters around the damper and for the operation of the gear and limit...

Page 42: ...correct U4 01 Indoor Outdoor transmission error Refer to the U4 flow chart UA 13 Refrigerant type error The type of refrigerant used for the indoor unit is different from that used for the outdoor uni...

Page 43: ...vant unit based on the Error code shown to the left E4 02 Low pressure error Slave 1 E4 03 Low pressure error Slave 2 E5 01 INV compressor lock Master Refer to the E5 flow chart of each manual and mak...

Page 44: ...ave 2 E7 29 Fan motor 1 instantaneous overcurrent Slave 2 E7 30 Fan motor 2 instantaneous overcurrent Slave 2 E7 33 Fan motor 1 IPM error Slave 2 E7 34 Fan motor 2 IPM error Slave 2 E9 01 Electronic e...

Page 45: ...outdoor air thermistor Master Refer to the H9 flow chart of each manual and make a diagnosis of the relevant unit based on the Error code shown to the left H9 02 Faulty outdoor air thermistor Slave 1...

Page 46: ...thermistor 3 Slave 1 STD compressor 2 J3 07 Faulty discharge pipe thermistor 1 Slave 2 INV compressor J3 08 Faulty discharge pipe thermistor 2 Slave 2 STD compressor 1 J3 09 Faulty discharge pipe the...

Page 47: ...ling heat exchanger outlet thermistor Slave 1 J9 03 Faulty subcooling heat exchanger outlet thermistor Slave 2 JA 01 Faulty high pressure sensor Master Refer to the JA flow chart of each manual and ma...

Page 48: ...verter PCB may be faulty Refer to the L1 flow chart of each manual and make a diagnosis of the relevant unit based on the Error code shown to the left L1 13 Current sensor error Slave 2 Inverter PCB L...

Page 49: ...in PCB Master Refer to the LC1 flow chart of each manual and make a diagnosis of the relevant unit based on the Error code shown to the left LC 06 Transmission error between INV PCB and main PCB Slave...

Page 50: ...the left U1 04 Reverse phase for power supply with power supply turned ON Master U1 05 Reverse phase open phase for power supply Slave 1 U1 06 Reverse phase for power supply with power supply turned O...

Page 51: ...Applicable Models All indoor models Method of Error Detection Detect open or short circuit between external input terminals in indoor unit Error Decision Conditions When an open circuit occurs between...

Page 52: ...o 12 first code No 1 has been set to external protection device input second code No 03 by remote controller YES NO Actuation of external protection device Check the setting state of the external ON O...

Page 53: ...of nonvolatile memory Maintains memory contents even when the power supply is turned OFF Supposed Causes Defective indoor unit PCB External factor Noise etc Troubleshooting Does the system return to n...

Page 54: ...XFQ FXZQ FXDQ FXMQ P FXHQ Option FXAQ Option Method of Error Detection By float switch OFF detection Error Decision Conditions When rise of water level is not a condition and the float switch goes OFF...

Page 55: ...power supply 220 240V provided Water builds up in the drain pan Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged YES YES NO YES NO Pro...

Page 56: ...the power supply is reset for the indoor unit The voltage of terminals Y1 and Y2 or connector is 220 240 V within 5 minutes of resetting the power supply Check the drain piping for clogging or upward...

Page 57: ...When the fan revolutions do not increase Supposed Causes Broken wires short circuits and loose connections in the fan motor harness Defective fan motor Broken wires or defective insulation Abnormal si...

Page 58: ...asurement of resistance between pins 2 Turn OFF the power supply and then wait for a period of 10 minutes Replace the indoor unit PCB Are there any foreign matters around the fan Remove the foreign ma...

Page 59: ...lso check whether or not the junction connector is properly connected 2 All resistance measuring points and judgement criteria Measuring point FG GND Vsp GND Vcc GND Vdc GND Criteria 1M or more 100k o...

Page 60: ...6 Applicable Models FXD Q Method of Error Detection This error is detected if there is no revolutions detection signal output from the fan motor Error Decision Conditions When no revolutions can be de...

Page 61: ...and the power supply turns ON Check the indoor unit fan motor and the wiring circuits of the fan motor Replace the indoor unit PCB Properly connect the connectors At this time check for any defective...

Page 62: ...ection from the position signal of the fan motor Detection from the current flow on the fan PCB when the fan motor starting operation Error Decision Conditions An overcurrent flows The RPM is less tha...

Page 63: ...can be moved lightly by hand after the fan motor connector of the fan PCB is removed Turn OFF the power and wait for 10 minutes There is a foreign matter around the fan Remove the foreign matter Repla...

Page 64: ...unbalanced or short circuited YES NO Between VCC and GND terminals and between GND and HW HV or HU terminals are short circuited Replace the fan motor A Remove the power wire connector from the fan mo...

Page 65: ...anced within a permissible dispersion range of 20 2 Measurement of signal wire connector Remove the connector and measure the resistance between GND and VCC HW HV or HU terminals of the motor connecto...

Page 66: ...ed by detecting that the individual power supply for the fan turns OFF Error Decision Conditions When it is not detected that the individual power supply for the indoor unit fan turns ON while in oper...

Page 67: ...perly connected YES Restart the fan motor Properly connect the cable It is supposed that the indoor unit fan motor stops running due to overload overcurrent or lock Replace the indoor unit PCB Is the...

Page 68: ...mit switch when the motor turns Error Decision Conditions When ON OFF of the micro switch for positioning cannot be reversed even though the swing flap motor is energized for a specified amount of tim...

Page 69: ...nit PCB is 220 240 VAC 60 Hz when turned ON again within 30 seconds of turning ON again The limit switch functions normally The relay cable is short circuited or disconnected Caution Be sure to turn o...

Page 70: ...ection flap cam mechanism is disconnected from the swing motor operation is normal when turned ON again Replace the power supply relay cable Replace the swing motor Take the flap cam mechanism apart r...

Page 71: ...licable Models FXMQ20 140P Method of Error Detection Detect error checking the input voltage of fan motor Error Decision Conditions When the input voltage of fan motor is 150V or less or 386V or more...

Page 72: ...NO NO YES It is possible to have external factor such as brownout and instantaneous blackout Check the condition of the power supply Check if power supply voltage is 220 240V 10 Check if there is pow...

Page 73: ...f electronic expansion valve main body by using micro computer Error Decision Conditions Pin input for electronic expansion valve coil is abnormal when initializing micro computer Either of the follow...

Page 74: ...restart Replace the electronic expansion valve coil Replace the relay cables When restarting the operation after shutting the power supply OFF does not work replace the indoor unit PCB NO Replace the...

Page 75: ...the continuity to judge the condition The normal products will show the following conditions 1 No continuity between 1 and 2 2 Resistance value between 1 and 3 is approx 300 3 Resistance value betwee...

Page 76: ...f Error Detection Water leakage is detected based on float switch ON OFF operation while the compressor is in non operation Error Decision Conditions When the float switch changes from ON to OFF while...

Page 77: ...ch as upward sloping A humidifier unit optional accessory is installed on the indoor unit Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be dam...

Page 78: ...to resistance of the capacity setting adaptor and the memory inside the IC memory on the indoor unit PCB and whether the value is normal or abnormal is determined Error Decision Conditions When the ca...

Page 79: ...ith a spare PCB The capacity setting adaptor need to be installed when replacing the PCB Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be dama...

Page 80: ...d of Error Detection Check the condition of transmission between indoor unit PCB and fan PCB using micro computer Error Decision Conditions When normal transmission is not carried out for certain dura...

Page 81: ...peration It is possible to have a cause such as instantaneous blackout Confirm the condition of transmission on indoor unit PCB using field setting mode 2 Under above field setting mode second code No...

Page 82: ...the connector of indoor unit PCB Short circuit the connector After turning ON the power check below numbers under field setting from remote controller Confirmation Second code No at the condition of...

Page 83: ...plicable Models All indoor models Method of Error Detection Error detection is carried out by temperature detected by liquid pipe thermistor Error Decision Conditions When the liquid pipe thermistor b...

Page 84: ...arts may be damaged Is the thermistor normal Normal The error is caused by defective contact YES NO Replace the indoor unit PCB YES Replace the thermistor NO 5 k to 90 k CHECK 11 Remove the thermistor...

Page 85: ...Applicable Models All indoor models Method of Error Detection Error detection is carried out by temperature detected by gas pipe thermistor Error Decision Conditions When the gas pipe thermistor beco...

Page 86: ...arts may be damaged Normal The error is caused by defective contact YES NO Replace the indoor unit PCB YES Replace the thermistor NO Remove the thermistor from the indoor unit PCB and then insert it a...

Page 87: ...oller Display C6 Applicable Models FXMQ20 140P Method of Error Detection Check the condition of transmission with fan PCB using indoor unit PCB Error Decision Conditions When the communication data of...

Page 88: ...parts may be damaged YES YES YES NO NO Was the correct capacity setting adaptor installed when replacing it with a spare PCB After establishing transmission for indoor and outdoor diagnose the operati...

Page 89: ...plicable Models All indoor models Method of Error Detection Error detection is carried out by temperature detected by suction air thermistor Error Decision Conditions When the suction air thermistor b...

Page 90: ...arts may be damaged Normal The error is caused by defective contact YES NO Replace the indoor unit PCB YES Replace the thermistor NO Remove the thermistor from the indoor unit PCB and then insert it a...

Page 91: ...l indoor models Method of Error Detection Error detection is carried out by temperature detected by discharge air temperature thermistor Error Decision Conditions When the discharge air temperature th...

Page 92: ...stance is normal when measured after disconnecting the thermistor from the indoor unit PCB 7 2k 112k Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts...

Page 93: ...CC Applicable Models FXFQ Method of Error Detection Even if an error occurs operation still continues Error is detected according to the moisture output voltage detected by the moisture sensor Error...

Page 94: ...e humidity sensor PCB assy and taking the steps 1 and 2 replace the indoor unit PCB assy Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be dama...

Page 95: ...Error detection is carried out by temperature detected by room temperature thermistor in remote controller Error Decision Conditions When the room temperature thermistor in remote controller becomes...

Page 96: ...the inspection mode Clear the error code history 1 While in inspection mode press and hold the ON OFF button for a period of 4 seconds or more YES Caution Be sure to turn off the power switch before...

Page 97: ...ction Abnormality is detected under the communication conditions in the hardware section between the indoor unit and outdoor unit Error Decision Conditions When the communication conditions in the har...

Page 98: ...h before connecting or disconnecting connectors or parts may be damaged External factor other than error for example noise etc Connect the inside outside relay wires correctly Replace the outdoor unit...

Page 99: ...ntroller Display E2 Applicable Models VRV WII WIII III and III Q Series Method of Error Detection Failure is to be detected by using leak detection PCB assy Error Decision Conditions Leakage is detect...

Page 100: ...tch line for any disconnection Check the earth leakage detection PCB for any broken wire in it Turn OFF the power supply and then disconnect compressor lead wire Replace the defective part Replace the...

Page 101: ...normal that there is no continuity between both ends of connector when the power supply turns OFF and for a period of 9 seconds at maximum after the power supply turns ON Check whether there is conti...

Page 102: ...ality is detected when the contact of the high pressure protection switch opens Error Decision Conditions Error is generated when the high pressure switch activation count reaches the number specific...

Page 103: ...h or pressure switch is open Operation is normal when turned ON again by remote controller Are the high pressure switch connectors connected to the outdoor main PCB 1 Caution Be sure to turn off the p...

Page 104: ...ion Abnormality is detected when the contact of the high pressure protection switch opens Error Decision Conditions Error is generated when the high pressure switch activation count reaches the number...

Page 105: ...Replace the high pressure switch Replace the high pressure sensor Connect the service checker to compare the high pressure value checked with the Service Checker and the actual measurement value by p...

Page 106: ...46 Refer to P 372 NO YES Check if the high pressure value and the actual measurement value by pressure sensor are the same Replace the outdoor unit main PCB The high pressure sensor is normal and the...

Page 107: ...oller Display E4 Applicable Models VRVII and II S Series Method of Error Detection Error Decision Conditions Error is generated when the low pressure is dropped under specific pressure Supposed Causes...

Page 108: ...NO YES NO Refrigerant shortage refrigerant system clogging wiring and piping wrong connection stop valve closed electronic expansion valve fully close error YES Replace the low pressure sensor Replace...

Page 109: ...III Q Series Method of Error Detection Abnormality is detected by the pressure value with the low pressure sensor Error Decision Conditions Error is generated when the low pressure drops while the com...

Page 110: ...ssure value checked with the Service Checker and the actual measurement value by pressure sensor 1 Service Checker Mount a pressure gauge on the low pressure service port Reset the operation using the...

Page 111: ...tage of the pressure sensor make measurement of voltage at the connector and then convert it to pressure 2 Make measurement of voltage of the pressure sensor Refer to P 348 Refer to P 372 CHECK 12 5V...

Page 112: ...nected between the inverter and compressor and detects the position signal pattern Error Decision Conditions The position signal with 3 times cycle as imposed frequency is detected when compressor mot...

Page 113: ...hort circuited or ground Is high differential pressure starting Is the UVWN wiring normal Is the stop valve open NO YES YES NO Open the stop valve NO YES YES NO NO Connect correctly YES Remedy the cau...

Page 114: ...line connected between the inverter and compressor and the error is detected when any abnormality is observed in the phase current waveform Error Decision Conditions This error will be output when the...

Page 115: ...open NO YES YES Local factor Open the stop valve NO Replace the connecting wires and then securely connect the connectors NO YES YES NO Ensure correct connection NO Ensure correct connection YES Repl...

Page 116: ...is within 5V Has the compressor started up at high differential pressure 1 NO NO YES Defective pressure equalizing Check the refrigerant system Measure the inverter output voltage 2 Note Measurement s...

Page 117: ...connected between the inverter and the compressor and detect location signal pattern Error Decision Conditions In normal operation location signal for a triple cycle of frequency applied while in lock...

Page 118: ...he compressor YES YES Eliminate the causes The hot gas bypass valve may not be opened Check it Restart operation after resetting operation YES Disconnect the connection between the compressor and the...

Page 119: ...sures before startup 2 The quality of the power transistor diode module can be assessed also by means of measurement of resistance between terminals Inverter output voltage among 3 phases is within 5V...

Page 120: ...I Q Series Method of Error Detection Detects the overcurrent with current sensor Error Decision Conditions Error is decided when the detected current value exceeds the below mentioned value for 2 seco...

Page 121: ...magnetic switch Is the power supply voltage normal NO Correct the power voltage YES YES Is above wiring correct NO Correct wiring Is current sensor correct NO Replace the corresponding current sensor...

Page 122: ...motor circuit based on the number of rotation detected by hole IC during the fan motor operation Error Decision Conditions Overcurrent is detected for inverter PCB or fan inverter PCB In the condition...

Page 123: ...r 2 relay connector or connectors of fan inverter PCB Fan motor 1 Both power supply wire and signal wire are all white Fan motor 2 Both power supply wire and signal wire are red in the PCB side and wh...

Page 124: ...the fan manually with ease when removing the connector of the fan motor Replace the corresponding fan motor YES NO Resistance value between the power supply wire terminal of fan motor and the motor f...

Page 125: ...and GND and between UVW and GND HAP lamp on the fan inverter PCB does not blink on the condition but the HAP lamp on the compressor PCB is blinking YES NO Replace the corresponding fan motor Put the...

Page 126: ...number of rotation detected by hole IC during the fan motor operation Error Decision Conditions Overcurrent is detected for inverter PCB or fan inverter PCB In the condition of fan motor rotation the...

Page 127: ...connection status of the connectors Fan motor 1 Connector of PCB Fan motor 2 Connector of PCB YES NO NO Check if any connector is disconnected Insert the connector YES Relay connectors have any conne...

Page 128: ...cuit between UVW phases Replace the corresponding fan motor YES NO No continuity of fuse on main PCB Replace the PCB YES YES NO Unable to rotate the fan manually with ease when removing the connector...

Page 129: ...ontroller 124 Refer to P 378 Refer to P 379 CHECK 17 Check fan motor connector signal wire The signal wire short circuits between Vcc and GND and between UVW and GND YES NO Replace the corresponding f...

Page 130: ...motor runs Error Decision Conditions When the fan runs with speed less than a specified one for 14 5 seconds or more when the fan motor running conditions are met When error is generated 4 times the...

Page 131: ...it PCB Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Check on connector of fan motor Power supply cable Check on pulse input of pos...

Page 132: ...Conditions When the fan runs with speed less than a specified one for 15 seconds or more when the fan motor running conditions are met When connector detecting fan speed is disconnected When error is...

Page 133: ...tacle around the fan NO YES Replace the fan motor of outdoor unit Can the fan be turned smoothly with hand after disconnect the connector of fan motor Harness connector between compressor inverter PCB...

Page 134: ...Power supply cable Check on connector of fan motor Signal wire NO Are the resistance values between phases of U V W balanced Is there any short circuiting between phases of U V W Replace the fan motor...

Page 135: ...ries Method of Error Detection Check disconnection of connector To be detected based on continuity existence of electronic expansion valve coil Error Decision Conditions No current is detected in the...

Page 136: ...expansion valve is normal 1 Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Turn power supply OFF and turn power supply ON again Che...

Page 137: ...ntroller 132 Note 1 Make measurement of resistance between the connector pins and then make sure the resistance falls in the range of 40 to 50 Orange 1 Measuring points 1 6 2 6 3 6 4 6 Red 2 Yellow 3...

Page 138: ...S Series Method of Error Detection Check disconnection of connector Check continuity of electronic expansion valve coil Error Decision Conditions Error is generated under no common power supply when...

Page 139: ...nnecting turn the power OFF and then back ON again Return to normal Electronic expansion valve is connected to outside unit PCB YES NO Replace the electronic expansion valve coil YES Replace the relay...

Page 140: ...ontinuity Pin No 1 White 2 Yellow 3 Orange 4 Blue 5 Red 6 Brown 1 White Approx 300 Approx 150 2 Yellow Approx 300 Approx 150 3 Orange Approx 150 4 Blue Approx 150 5 Red 6 Brown M White 1 Yellow 2 Blue...

Page 141: ...f Error Detection Abnormality is detected according to the temperature detected by the discharge pipe thermistor Error Decision Conditions When the discharge pipe temperature rises to an abnormally hi...

Page 142: ...vice Checker Connect the service checker to compare the temperature of discharge pipe by using service checker with actual measurement value of discharge pipe thermistor CHECK 11 Discharge pipe thermi...

Page 143: ...ooting by Indication on the Remote Controller 138 Note 1 Compare the resistance value of discharge pipe thermistor and the value based on the surface thermometer Refer to P 351 Refer to P 369 CHECK 3...

Page 144: ...lity is detected according to the temperature detected by the discharge pipe thermistor Error Decision Conditions When the discharge pipe temperature rises to an abnormally high level When the dischar...

Page 145: ...ce of the thermistor refer to 1 Refer to P 351 NO YES YES Replace the discharge pipe thermistor Are discharge pipe thermistor characteristics normal 1 NO Replace the main PCB Is PCB detection temperat...

Page 146: ...ity is detected according to the temperature detected by the discharge pipe thermistor Error Decision Conditions When the discharge pipe temperature rises to an abnormally high level When the discharg...

Page 147: ...Are the characteristics of the discharge pipe thermistor normal NO YES Refrigerant shortage compression defect etc Defective refrigerant system Replace the discharge pipe thermistor Replace the outdoo...

Page 148: ...ture heat exchanger deicer temperature and liquid pipe temperature during check operation Error Decision Conditions When the amount of refrigerant which is calculated by using the outdoor air temperat...

Page 149: ...tdoor air thermistor heat exchanger deicer thermistor and the liquid pipe thermistor from the outdoor unit PCB and measure resistance with a tester Replace the thermistor Rectify the overcharge of ref...

Page 150: ...on pipe temperature and subcooling heat exchanger outlet temperature during check operation Error Decision Conditions When the suction pipe temperature and the subcooling heat exchanger outlet tempera...

Page 151: ...stance with a tester Replace the thermistor if it functions abnormally before operation Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damag...

Page 152: ...s lower than evaporating temperature during check operation Supposed Causes Refrigerant overcharge Disconnection of the receiver gas pipe thermistor Troubleshooting NO YES Are the suction pipe and sub...

Page 153: ...ection device circuit checks continuity in the high pressure switch Error Decision Conditions When there is no continuity in the high pressure switch during the compressor stops operating Supposed Cau...

Page 154: ...r If there is a compressor error there is the possibility that the INV PCB and outdoor unit PCB have been damaged Check that each of these PCBs is normal Is there a disconnection or insulation failure...

Page 155: ...dels VRVIII and III Q Series Method of Error Detection Detection of abnormal signal from fan motor Error Decision Conditions In case of detection of abnormal signal at starting fan motor Supposed Caus...

Page 156: ...tor is normal Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Check the fan motor corresponding to the error code H7 in the monitor m...

Page 157: ...each phase is within 20 Connector for signal wires Replace the inverter PCB zFor fan motor 1 replace the inverter PCB zFor fan motor 2 replace the fan inverter PCB A YES Check if the resistance of th...

Page 158: ...ies Method of Error Detection Detection of abnormal signal from fan motor Error Decision Conditions In case of detection of abnormal signal at starting fan motor Supposed Causes Abnormal fan motor sig...

Page 159: ...ct correctly NO Replace the fan motor Replace the fan inverter PCB Turn power OFF Check connector of fan motor 1 The resistance of fan motor read wire connector pins between Vcc UVW and GND UVW balanc...

Page 160: ...odels VRVIII III S and III Q Series Method of Error Detection Error is detected from the temperature detected by the outdoor air thermistor Error Decision Conditions When the outdoor air thermistor ha...

Page 161: ...d turn ON again NO Replace the thermistor Replace the outdoor unit PCB Confirm which thermistor is abnormal using outdoor unit monitor mode Resistance is normal when measured after disconnecting the t...

Page 162: ...odels VRVII and II S Series Method of Error Detection The abnormal detection is based on current detected by current sensor Error Decision Conditions When the outdoor air temperature sensor has short...

Page 163: ...is connected to outdoor unit PCB NO YES Connect the connector and turn ON again Resistance is normal when measured after disconnecting the thermistor from the outdoor unit PCB NO Replace the thermist...

Page 164: ...ed OFF interlock circuit When interlock setting is provided Error Decision Conditions When temperature on the heat exchanger gas side drops remarkably with the smallest operation step of the compresso...

Page 165: ...amount of water of heat exchanger 50 l minute or more NO Secure the enough water NO Is the heat exchanger dirty YES Clean the heat exchanger Is the connection between the thermistor on the heat excha...

Page 166: ...low pressure sensor normal 1 NO Replace the thermistor sensor if any of its characteristics are abnormal Disconnect the connection between the compressor and the inverter and turn ON the power transi...

Page 167: ...Method of Error Detection Error is detected from the pressure measured with high pressure sensor Error Decision Conditions When the high pressure sensor is short circuit or open circuit Supposed Caus...

Page 168: ...Replace the high pressure sensor NO Replace the outdoor unit sub PCB 1 Set the high pressure gauge 2 Connect the checker for VRV Reset the operation and then restart the outdoor unit If the PCB press...

Page 169: ...Troubleshooting by Indication on the Remote Controller 164 YES Are the characteristics of the high pressure sensor normal NO Replace the high pressure sensor Replace the outdoor unit sub PCB A...

Page 170: ...III Q Series Method of Error Detection Error is detected according to the current value detected by current sensor Error Decision Conditions When the current value detected by current sensor becomes 5...

Page 171: ...2 STD compressors NO YES NO Mount the current sensor correctly and operate the unit again Is the current sensor mounted on the T phase and R phase wire Replace the current sensor or outdoor unit PCB C...

Page 172: ...or more during standard compressor operation Supposed Causes Defective current sensor Defective outdoor unit PCB Troubleshooting NO YES Connect the connector and operate unit again Is the connector fo...

Page 173: ...door unit series Method of Error Detection Error is detected from the temperature detected by discharge pipe thermistor Error Decision Conditions When a short circuit or an open circuit in the dischar...

Page 174: ...is connected to outdoor unit PCB NO Replace the thermistor Resistance is normal when measured after disconnecting the thermistor from the outdoor unit PCB Confirm which discharge pipe thermistor is ab...

Page 175: ...plicable Models VRV WII and WIII Series Method of Error Detection Error is detected according to the temperature detected by heat exchanger gas pipe thermistor Error Decision Conditions When the heat...

Page 176: ...ector for heat exchanger gas pipe thermistor connected to outside unit PCB NO Replace the thermistor Is the resistance measured after removing the thermistor from outside unit PCB normal CHECK 11 Caut...

Page 177: ...door unit models Method of Error Detection Error is detected from the temperature detected by the suction pipe thermistor Error Decision Conditions When a short circuit or an open circuit in the sucti...

Page 178: ...in Connector is connected to outdoor unit PCB NO Replace the thermistor Resistance is normal when measured after disconnecting the thermistor from the outdoor unit PCB Caution Be sure to turn off the...

Page 179: ...III III S and III Q Series Method of Error Detection Error is detected from the temperature detected by the outdoor unit heat exchanger thermistor Error Decision Conditions When a short circuit or an...

Page 180: ...or unit PCB NO Replace the thermistor Resistance is normal when measured after disconnecting the thermistor from the indoor unit PCB Confirm which thermistor is abnormal using outdoor unit monitor mod...

Page 181: ...WII III WIII III S and III Q Series Method of Error Detection Error is detected according to the temperature detected by liquid pipe thermistor Error Decision Conditions When the liquid pipe thermisto...

Page 182: ...to outdoor outside unit PCB NO Replace the thermistor Is the resistance measured after removing the thermistor from outdoor outside unit PCB normal Confirm which thermistor is abnormal using outdoor u...

Page 183: ...odels VRVIII Q Series Method of Error Detection Error is detected according to the temperature detected by each individual thermistor Error Decision Conditions When thermistor is disconnected or short...

Page 184: ...l Normal NO Replace the thermistor Check connectors for connection Remove thermistor from outdoor unit PCB then measure the resistance using a tester Caution Be sure to turn off the power switch befor...

Page 185: ...All outdoor unit series Method of Error Detection Error is detected according to the temperature detected by subcooling heat exchanger gas pipe thermistor Error Decision Conditions When the subcooling...

Page 186: ...pe thermistor connected to outdoor unit PCB NO Replace the thermistor Is the resistance measured after removing the thermistor from outdoor unit PCB normal Confirm which thermistor is abnormal using o...

Page 187: ...ies Method of Error Detection Error is detected from the pressure detected by the high pressure sensor Error Decision Conditions When the high pressure sensor is short circuit or open circuit Supposed...

Page 188: ...re sensor Is the PCB pressure detection normal Make a comparison between the checker pressure data and the voltage characteristics 1 NO Replace the outdoor unit main PCB Confirm which high pressure se...

Page 189: ...nd then restart the outdoor unit A Are the characteristics of the high pressure sensor normal NO Replace the high pressure sensor YES Replace the outdoor unit main PCB CHECK 12 Measure DC voltage here...

Page 190: ...S WII and WIII Series Method of Error Detection Error is detected from the pressure detected by the high pressure sensor Error Decision Conditions When the discharge pipe pressure sensor is short cir...

Page 191: ...ure sensor and turn ON again The relationship between the 1 VH and high pressure is normal 2 when voltage is measured between connector pins 1 and 3 of outdoor outside unit PCB 1 YES Replace the outdo...

Page 192: ...e Remote Controller 187 1 Voltage measurement point Refer to P 372 Outdoor outside unit PCB GND Micro computer A D input Measure DC voltage here Red Black White High pressure sensor Connector for high...

Page 193: ...Q Series Method of Error Detection Error is detected from pressure detected by the low pressure sensor Error Decision Conditions When the low pressure sensor is short circuit or open circuit Supposed...

Page 194: ...nsor YES Is the PCB pressure detection normal Make a comparison between the checker pressure data and the voltage characteristics 1 NO Replace the outdoor unit main PCB Confirm which low pressure sens...

Page 195: ...then restart the outdoor unit Are the characteristics of the low pressure sensor normal A NO Replace the low pressure sensor YES Replace the outdoor unit main PCB Outdoor unit PCB GND Micro computer...

Page 196: ...I II S WII and WIII Series Method of Error Detection Error is detected from pressure detected by low pressure sensor Error Decision Conditions When the suction pipe pressure sensor is short circuit or...

Page 197: ...property and restart system The relationship between the 1 VH and low pressure is normal 2 when voltage is measured between connector pins 2 and 3 of outdoor outside unit PCB A1P 1 YES Replace the out...

Page 198: ...e Remote Controller 193 Note 1 Voltage measurement point Refer to P 372 Micro computer A D input Red Black White Low pressure sensor Outdoor outside unit PCB Measure voltage here GND Connector for low...

Page 199: ...n the current value during waveform output before starting compressor Error is detected based on the value from current sensor during synchronous operation when starting the unit Error Decision Condit...

Page 200: ...r lead wires Turn ON the power supply again While in monitor mode check the outdoor unit concerned While in monitor mode check whether the system is right hand service monitor PCB 1 or left hand servi...

Page 201: ...rter PCB Replace the inverter PCB NO NO Replace the compressor and compressor inverter PCB at the same time Replace the inverter PCB YES YES CHECK 4 Check if the power transistor of the fan driver is...

Page 202: ...value during waveform output before starting compressor Error is detected based on the value from current sensor during synchronous operation when starting the unit Error Decision Conditions Overcurr...

Page 203: ...res e g exogenous noises or thunder NO NO Replace the outdoor unit main PCB at the same time Replace the outdoor unit main PCB Turn OFF the power supply once and then check the compressor lead wires T...

Page 204: ...ing by Indication on the Remote Controller 199 Refer to P 354 YES NO Replace the outdoor unit main PCB Replace the outdoor unit main PCB CHECK 4 Check if the power transistor of the fan driver is norm...

Page 205: ...r startup Detect error by current sensor value during synchronized operation at the time of startup Error Decision Conditions When overcurrent is detected at the time of waveform output before operati...

Page 206: ...r PCB and fan inverter PCB Replace the inverter PCB NO NO Replace the compressor and compressor inverter PCB at the same time Replace the inverter PCB Turn OFF the power supply once and turn ON again...

Page 207: ...lay L4 Applicable Models VRVIII Series Method of Error Detection Fin temperature is detected by the thermistor of the radiation fin Error Decision Conditions When the temperature of the inverter radia...

Page 208: ...rature Fan propeller for damage Does the error recur when the power supply turns ON to start the compressor YES Replace the compressor inverter PCB Turn OFF the power supply and then make measurement...

Page 209: ...e operation z It is supposed that the radiation fin temperature became high due to some field factors In this connection check the following points Stained radiation fin Airflow obstructed with dirt o...

Page 210: ...WIII III S and III Q Series Method of Error Detection Fin temperature is detected by the thermistor of the radiation fin Error Decision Conditions When the temperature of the inverter radiation fin i...

Page 211: ...power unit radiation Intake port is clogged Radiation fin is dirty Outdoor air temperature is high Is reset possible NO Replace the inverter PCB Measure the resistance of the radiation fin thermistor...

Page 212: ...Series Method of Error Detection Error is detected from current flowing in the power transistor Error Decision Conditions When an excessive current flows in the power transistor Instantaneous overcurr...

Page 213: ...connection to the compressor are normal NO YES Correct the wiring and connection Insulation resistance of the compressor is 100 k or below YES NO Replace the inverter compressor Compressor coils are d...

Page 214: ...g by Indication on the Remote Controller 209 Refer to P 354 Failure occurs again after restarting the unit NO Continue the operation Momentary power failure is possible Replace the inverter compressor...

Page 215: ...d of Error Detection Error is detected from current flowing in the power transistor Error Decision Conditions When an excessive current flows in the power transistor Instantaneous overcurrent also cau...

Page 216: ...t Inverter output voltage check Inverter output voltage is not balanced Normal if within 10V for Y1 YL power supply and 5V for TL power supply Must be measured when frequency is stable Disconnect the...

Page 217: ...an actual is displayed when the inverter output voltage is checked by tester A YES Correct the power supply There is instantaneous power drop NO Compressor inspection Inspect according to the diagnosi...

Page 218: ...istor Error Decision Conditions When overload in the compressor is detected For 460V units 1 19 0A and over continues for 5 seconds 2 16 1A and over continues for 260 seconds For 230V units 1 A curren...

Page 219: ...r are normal NO YES Correct the wiring and connection Insulation resistance of the compressor is 100 k or below YES NO Replace the inverter compressor Compressor coils are disconnected YES NO Replace...

Page 220: ...YES NO Error code L8 is displayed again Continue the operation NO Check if the pressure difference between high pressure and low pressure before restarting is 0 2MPa or below Defective pressure equali...

Page 221: ...e Models VRVII WII II S WIII III S and III Q Series Method of Error Detection Error is detected by current flowing in the power transistor Error Decision Conditions When overload in the compressor is...

Page 222: ...nverter is higher than 16 5A Y1 YL power supply and 25 1 A TL power supply for each phase YES Replace the compressor Compressor inspection The compressor s coil is disconnected Disconnect the connecti...

Page 223: ...L8 blinks again NO Reset and restart Compressor inspection Inspect according to the diagnosis procedure for odd noises vibration and operating status of the compressor YES NO Replace the inverter PCB...

Page 224: ...II Series Method of Error Detection Detect the failure based on the signal waveform of the compressor Error Decision Conditions Starting the compressor does not complete Supposed Causes Stop valve is...

Page 225: ...is open Open the stop valve Charge a right amount of refrigerant NO Refrigerant is melting in refrigerant oil The unit is out of power supply for more than 6 hours Cancel the melting state of refriger...

Page 226: ...Troubleshooting by Indication on the Remote Controller 221 A NO Check if the compressor lead wires are disconnected YES Fix the compressor lead wire Correct the wiring then supply power to restart...

Page 227: ...ours Cancel the melting state of refrigerant YES YES NO YES Check if the insulation resistance of the compressor is 100k or more Replace the inverter compressor NO Broken inside the compressor Replace...

Page 228: ...VRVII WII II S WIII III S and III Q Series Method of Error Detection Error is detected from current flowing in the power transistor Error Decision Conditions When overload in the compressor is detect...

Page 229: ...ect the connection between the compressor and inverter Make the power transistor check mode ON by service mode A Caution Be sure to turn off the power switch before connecting or disconnecting connect...

Page 230: ...han actual is displayed when the inverter output voltage is checked by tester A YES After turning ON again L9 blinks again NO Reset and restart Compressor inspection Inspect according to the diagnosis...

Page 231: ...een inverter PCB and control PCB by micro computer Error Decision Conditions When the correct communication is not conducted in certain period or longer Supposed Causes Defective connection between th...

Page 232: ...sor has insulation resistance of not more than 100k YES NO Replace the fan motor The fan motor has insulation resistance of not more than 1M NO YES Not the LC error Check the error code again The micr...

Page 233: ...ration It is supposed that the error results from causes such as instantaneous power failure The micro computer normal monitor green of the inverter PCB is blinking NO Replace the inverter PCB If the...

Page 234: ...state between inverter PCB and control PCB by micro computer Error Decision Conditions When the correct communication is not conducted in certain period Supposed Causes Defective connection between t...

Page 235: ...ter PCB is blinking YES Replace the inverter PCB When the LC error occur again replace the control PCB The voltage between 2 pins of connector on the inverter unit is 220 240 V The transmission wiring...

Page 236: ...e between inverter PCB and control PCB by micro computer Error Decision Conditions When the correct communication is not conducted in certain period Supposed Causes Error of connection between the inv...

Page 237: ...e connector The micro computer monitor green on fan drive board is blinking YES Defective outdoor unit main PCB or defective inverter PCB The micro computer monitor green on the inverter PCB is blinki...

Page 238: ...S Replace the inverter PCB When the LC error occur again replace the control PCB The voltage between red and white of connector on the inverter unit is 220 240 V NO Check the noise filter for disconne...

Page 239: ...erter Consequently the increased ripple is detected Error Decision Conditions When the resistance value of thermistor becomes a value equivalent to open or short circuited status Error is not decided...

Page 240: ...n fusion or contact is poor 3 Loose or disconnected noise filter When voltage monitoring is possible Using a device capable of constant recording of power supply voltage record power supply voltage be...

Page 241: ...diode module inside the inverter while the compressor is running A Explanation for users Give the user a copy of notification of inspection results and leave it up to him to improve the imbalance Be s...

Page 242: ...sion Conditions When the resistance value of thermistor becomes a value equivalent to open or short circuited status Error is not decided while the unit operation is continued P1 will be displayed by...

Page 243: ...nt recording of power supply voltage record power supply voltage between 3 phases L1 L2 L2 L3 L3 L1 for about one continuous week Power supply voltage imbalance Caution Be sure to turn off the power s...

Page 244: ...fin thermistor is detected when the compressor is not operating Error Decision Conditions When the resistance value of thermistor becomes a value equivalent to open circuited or short circuited statu...

Page 245: ...S The fan motor s insulation resistance is not more than 1M Replace the fan motor NO YES Does the error recur when the power supply turns ON Replace the inverter PCB Continue the operation Measure res...

Page 246: ...ion fin thermistor is detected when the compressor is not operating Error Decision Conditions When the resistance value of thermistor becomes a value equivalent to open or short circuited status Error...

Page 247: ...lace the inverter PCB Thermistor can not be removed from the inverter PCB NO Is the resetting possible Replace the inverter PCB YES After resetting restart Measure the resistance of radiation fin ther...

Page 248: ...PJ Applicable Models VRVIII Series Method of Error Detection This error is detected according to communications with the inverter PCB Error Decision Conditions Make judgement according to communicati...

Page 249: ...e of the compressor inverter PCB correct Replace it with the correct compressor inverter PCB YES Is the type of the fan inverter PCB correct Replace it with the correct fan inverter PCB YES NO Does th...

Page 250: ...s Method of Error Detection This error is detected according to communications with the INV PCB Error Decision Conditions Make judgement according to communication data on whether or not the type of t...

Page 251: ...ct Replace it with the correct fan inverter PCB YES Is the setting of dip switches when replace the main PCB correct Set the DIP switches correctly After setting Reset the power supply YES NO Does the...

Page 252: ...or no field setting after replacing main PCB or defective PCB combination is detected through communications with the inverter Error Decision Conditions Whether or not the field setting or the type of...

Page 253: ...ressor Fan driver PCB YES NO Has the PCB been replaced YES NO When replacing the PCB were field setting properly made Correct the field settings YES NO Is the type of PCB correct 1 Replace with a corr...

Page 254: ...munication data about inverter PCB type is incorrect Supposed Causes Mismatching of inverter PCB Defective field setting Troubleshooting YES YES NO Was the PCB replaced NO Is the PCB type correct Repl...

Page 255: ...and heat exchanger Error Decision Conditions In cooling mode Low pressure becomes 0 1MPa or below In heating mode The degree of superheat of suction gas becomes 20 C and over SH Ts1 Te Ts1 Suction pi...

Page 256: ...pe and the heat exchanger is 20 C and over Check if the property of suction pipe thermistor and heat exchanger thermistor are normal 3 Replace the thermistor Remove the factor of superheating by refer...

Page 257: ...alue by pressure sensor with the value by the pressure gauge To gain actual measurement value by pressure sensor measure the voltage at the connector between 2 3 and then convert the value into pressu...

Page 258: ...ure between the suction pipe and the heat exchanger Error Decision Conditions In cooling Low pressure of 0 25 MPa or less continues for 30 minutes In heating Suction gas superheated degree of 20 C or...

Page 259: ...Service Checker with pressure sensor measurements 1 NO Are the low pressure sensor characteristics normal 1 Replace the low pressure sensor NO YES YES Is the PCB detector pressure normal 2 Replace th...

Page 260: ...h measurements obtained in 3 above Refer to P 348 Refer to P 351 Refer to P 372 NO YES YES Are characteristics of the suction pipe thermistor and the heat exchanger thermistor normal 3 Replace the the...

Page 261: ...f refrigerant is detected by discharge pipe thermistor Error Decision Conditions Micro computer judge and detect if the system is refrigerant shortage Error is not decided while the unit operation is...

Page 262: ...frigerant system YES Replace the main outdoor unit PCB Shortage of gas or refrigerant system is clogged Requires check of refrigerant system Cooling NO NO CHECK 12 Caution Be sure to turn off the powe...

Page 263: ...8 Refer to P 369 Refer to P 372 A NO Replace the thermistor Replace the outdoor unit PCB CHECK 11 Resistance is normal when measured with the suction pipe thermistor and heat exchanger thermistor disc...

Page 264: ...WIII and III Q Series Method of Error Detection The phase of each phase are detected by reverse phase detection circuit and right phase or reverse phase are judged Error Decision Conditions When a pow...

Page 265: ...e open phase Requires inspection of field power supply section NO YES Operation is normal if one place of power supply line phase is replaced Reverse phase Countermeasure of the problem is completed b...

Page 266: ...ltage Error Decision Conditions When the voltage aforementioned is not less than 780V or not more than 320V or when the current limiting voltage does not reach 200V or more or exceeds 740V For 230V un...

Page 267: ...oltage will cause extremely unbalanced current thus impairing the service life of or resulting in the defective the equipment The insulation resistance is low i e not more than 100k YES Replace the co...

Page 268: ...tions of the PCB In the case of a serious failure a compressor failure may cause the failure of the PCB Even if the PCB is replaced it may cause failure again To avoid that recheck the compressor for...

Page 269: ...own below Furthermore check the connectors for terminal conditions and continuity B C NO Has the inverter PCB caused damage YES Replace the inverter PCB If the PCB replaced is badly damaged the compre...

Page 270: ...NO Stop standby when the compressor starts up YES Recheck for the power supply If there is no problem with the power supply replace the inverter PCB If the PCB replaced is badly damaged compressor is...

Page 271: ...capacitor built in the inverter PCB and power supply voltage Error Decision Conditions When the voltage aforementioned is not less than 190V Supposed Causes Power supply insufficient Instantaneous po...

Page 272: ...e of fan motor is not more 1M Replace the fan motor If the fan motor is badly damaged replace the inverter PCB CHECK 4 NO YES Is the power transistor normal Replace the inverter PCB A Caution Be sure...

Page 273: ...rotates Replace the noise filter PCB Defective noise filter NO YES Stop standby when the compressor startup Replace the inverter PCB If the inverter PCB is badly damaged recheck the compressor NO YES...

Page 274: ...main circuit capacitor built in the inverter and power supply voltage Error Decision Conditions When the capacitor above only has a voltage of 360 V or less YL and 210V or less TL Supposed Causes Powe...

Page 275: ...tic contact switch ON Repair wiring YES NO The voltage between the P2 or P3 and N3 terminals is 320 VDC Y1 YL or more and 190 VDC TL or less when the compressor is running Replace the inverter PCB Mon...

Page 276: ...s 220 240 V at the connector inverter PCB Is 220 240 V at the connector outside PCB side Replace the inverter PCB NO YES Does the voltage between terminals P2 or P3 and N3 gradually rise to 556 VDC Y1...

Page 277: ...er supply voltage Error Decision Conditions When the voltage aforementioned is not less than 780V or not more than 320V or when the current limiting voltage does not reach 200V or more or exceeds 740V...

Page 278: ...Unbalanced voltage will cause extremely unbalanced current thus impairing the service life of or resulting in the error of the equipment The insulation resistance is low i e not more than 100k YES Rep...

Page 279: ...se the failure of the PCB Even if the PCB is replaced it may cause failure again To avoid that recheck the compressor for ground and for any broken wires Furthermore even after the completion of PCB r...

Page 280: ...compressor Turn ON the power supply C NO Stop standby before the fan rotates YES Recheck for the power supply If there is no problem with the power supply replace the noise filter PCB If the error rec...

Page 281: ...temporarily result from onsite causes Causes Instantaneous power failure open phase noises or else C Power ON NO Stop standby when the compressor starts up YES Recheck for the power supply If there i...

Page 282: ...ain circuit capacitor built in the inverter and power supply voltage Error Decision Conditions When the capacitor above only has a voltage of 360 V or less YL and 210V or less TL Supposed Causes Power...

Page 283: ...ic contact switch ON Repair the wiring YES NO The voltage between the P2 or P3 and N3 terminals is 320 VDC YL or more and 190 VDC TL or less when the compressor is running Replace the inverter PCB Mon...

Page 284: ...the connector of inverter PCB Is 220 240 V at the connector of outdoor outside PCB side Replace the inverter PCB NO YES Does the voltage between terminals P2 or P3 and N3 gradually rise to 556 VDC YL...

Page 285: ...RVII S Series Method of Error Detection Detection of voltage of main circuit capacitor built in the inverter and power supply voltage Error Decision Conditions Supposed Causes Power supply insufficien...

Page 286: ...y rise to 283VDC after turning ON Replace the inverter PCB YES NO The voltage between the P and N terminals is 400VDC and 190VDC or more when the compressor is running Replace the inverter PCB NO YES...

Page 287: ...ting by Indication on the Remote Controller 282 A NO Is 200V at the connector of outdoor unit PCB side Monitor field power supply Check the transmission wiring between the outdoor unit PCB and inverte...

Page 288: ...cuted Remote Controller Display U3 Applicable Models All outdoor unit series Method of Error Detection Check operation is executed or not executed Error Decision Conditions Error is decided when the u...

Page 289: ...n ON the field setting mode 2 3 to conduct a check operation YES Performs the check operation again and completes the check operation When a leakage detection function is needed normal operation of ch...

Page 290: ...tion Micro computer checks if transmission between indoor and outdoor units is normal Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Caus...

Page 291: ...ontrollers of the same refrigerant system display U4 YES Press and hold the RESET button on the outdoor unit main PCB for 5 seconds The unit will not operate for up to 12 minutes Fix the indoor outdoo...

Page 292: ...Troubleshooting by Indication on the Remote Controller 287 A YES The fuse on the outdoor unit s PCB is burnt Replace the fuse Replace the outdoor unit PCB NO...

Page 293: ...al Replace the outdoor unit PCB NO YES Operation ready lamp H2P is blinking YES NO Lamp does not go OFF for 12 minutes or more Press and hold the RESET button on the outdoor unit PCB for 5 seconds NO...

Page 294: ...etects that the transmission between the indoor and outdoor unit is not normal Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Causes Indo...

Page 295: ...the master outdoor unit Keep pressing for 5 seconds or more Operation does not start for a maximum 12 minutes Replace the indoor unit PCB Correct the connecting wires NO YES NO NO Do all the indoor r...

Page 296: ...utdoor unit main PCB Keep pressing for 5 seconds or more Reset the power supply A Correct the voltage 400V Replace the outdoor unit PCB NO NO YES Does the normal condition monitor for the micro comput...

Page 297: ...ndication on the Remote Controller 292 Check if the operation is normal with 1 circuit after outdoor outdoor connecting wires are disconnected NO YES Replace the outdoor unit main PCB Install DIII Net...

Page 298: ...ndicated NO Make a diagnosis again based on the indication in 2 minutes and over The indoor units PCB indicating U9 are normal Check the indoor units in the other circuits to diagnose failure accordin...

Page 299: ...ion between indoor and outdoor outside units is normal Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Causes Indoor to outdoor outside to...

Page 300: ...oor outside unit PCB for 5 seconds The unit will not operate for up to 12 minutes Replace the indoor unit PCB Fix the indoor outdoor outside unit transmission wiring NO YES YES NO NO All indoor unit r...

Page 301: ...S Outdoor outside unit PCB micro computer monitor HAP blinks Operation ready lamp H2P is blinking The voltage between terminals L1 and N of the outdoor outside unit PCB is 220 240 V Replace the fuse Y...

Page 302: ...the Remote Controller 297 NO YES Is indoor outdoor outside unit and outdoor outside unit outdoor outside unit transmission wiring normal Fix the indoor outdoor outside unit transmission wiring Replac...

Page 303: ...ntroller check the system using micro computer is signal transmission between indoor unit and remote controller main and sub is normal Error Decision Conditions Normal transmission does not continue f...

Page 304: ...in Using 2 remote controllers control All indoor unit PCB micro computer monitors blink NO YES Replace the remote controller Replace the indoor unit PCB Normal NO YES Normal There is possibility of er...

Page 305: ...s When transmission is not carried out normally for a certain amount of time Supposed Causes Improper connection of transmission wiring between outdoor unit and external control adaptor for outdoor un...

Page 306: ...control adaptor for outdoor unit is mounted Go on to the Diagnosis Flow 3 Abnormal transmission between the master unit and the slave unit 1 Go on to the Diagnosis Flow 4 Abnormal transmission betwee...

Page 307: ...on the Remote Controller 302 Go on to the Diagnosis Flow 7 Connection of 4 or more outdoor units to the same circuit Go on to the Diagnosis Flow 8 Defective auto address of the slave units 1 and 2 Che...

Page 308: ...onnecting wiring with the external control adaptor for outdoor unit Supply the power to the outdoor unit Replace the outdoor unit main PCB Check if the normal condition monitor LED for the outdoor uni...

Page 309: ...tdoor unit to 5V supply line Replace the PCB of the external control adaptor for outdoor unit Check if the normal condition monitor LED for the external control adaptor for outdoor unit blinks NO Chec...

Page 310: ...outdoor transmission are duplicated Set the address again Setting of C H SELECT of the external control adaptor for outdoor unit is SLAVE NO YES Replace the outdoor unit main PCB Supply the power to...

Page 311: ...ontrol adaptor for outdoor unit Replace the outdoor unit main PCB Check if the normal condition monitor LED for the external control adaptor for outdoor unit blinks NO NO YES Set the C H SELECT of the...

Page 312: ...if the wiring is disconnected or is about to be disconnected Replace the outdoor unit main PCB of the SLAVE 1 YES Correct the connecting wires of the outdoor multi and then reset the power supply Dia...

Page 313: ...place the outdoor unit main PCB of the SLAVE 2 YES Correct the connecting wires of the outdoor multi and then reset the power supply Diagnosis Flow 4 Check of error 3 Check of error 4 NO Check if the...

Page 314: ...door multi and then reset the power supply Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Diagnosis Flow 6 Check of error 3 Check of...

Page 315: ...he connecting wires of outdoor multi Check if the wiring has any connection error or broken or is about to be disconnected Replace the outdoor unit main PCB YES Correct the connecting wires of the out...

Page 316: ...ly for a certain amount of time Supposed Causes Improper connection of transmission wiring between outdoor outside unit and external control adaptor for outdoor outside unit Improper cool heat selecti...

Page 317: ...CT is set to IND NO YES Set C H SELECT to IND Cool heat selection is unified YES NO The cool heat unified address for outdoor outside units in outdoor outside outdoor outside unit transmission is dupl...

Page 318: ...atch Outdoor outside unit unified master unit Is there continuity Does the cool heat unified address match NO NO YES YES YES C H SELECT is set to SLAVE Check and see if the following items are normal...

Page 319: ...tion In case of controlling with 2 remote controller check the system using micro computer if signal transmission between indoor unit and remote controller main and sub is normal Error Decision Condit...

Page 320: ...If an error occurs replace the remote controller PCB NO YES NO Using 2 remote controllers control SS1 of remote controller PCBs is set to MAIN SS1 of both remote controllers is set to SUB Set one rem...

Page 321: ...etect the abnormal signal for the other indoor units within the circuit by outdoor unit PCB Error Decision Conditions When the error decision is made on any other indoor unit within the system concern...

Page 322: ...diagnose by display after passage of 2 minutes or more YES The outdoor unit PCB indicated by the error code U9 is normal Check for the indoor unit of other system and then conduct troubleshooting by d...

Page 323: ...ndoor unit within the system concerned Error Decision Conditions When the error decision is made on any other indoor unit within the system concerned Supposed Causes Transmission error within or outdo...

Page 324: ...ailure diagnosis for UA error code U9 has been displayed for 2 minutes or more YES NO Re diagnose by display after passage of 2 minutes or more YES NO Refer to failure diagnosis for A1 error code The...

Page 325: ...n on the Remote Controller 320 NO A The U4 display blinks on the remote controllers of other units within the same refrigerant system YES Refer to failure diagnosis for U4 error code Refer to failure...

Page 326: ...erence occurs in data by the type of refrigerant between indoor and outdoor units The number of indoor units is out of the allowable range Error Decision Conditions The error decision is made as soon...

Page 327: ...power switch before connecting or disconnecting connectors or parts may be damaged To Diagnosis Flow 1 Excessive number of indoor units connected Check 3 Check 4 To Diagnosis Flow 2 Connection of err...

Page 328: ...oor units exceeds the standard Check the connection to correct Check if the refrigerant type of the outdoor unit corresponds to that of the indoor unit YES NO Replace the outdoor unit main PCB Match t...

Page 329: ...PCB YES YES NO Check if the spare PCB setting is correct Correct the setting to reset the power Diagnosis Flow 3 Check 3 Check 4 Caution Be sure to turn off the power switch before connecting or disc...

Page 330: ...of the allowable range Incorrect signals are transmitted among the indoor unit BS unit and outdoor unit Error Decision Conditions The error decision is made as soon as either of the abnormalities afo...

Page 331: ...Diagnosis Flow 1 Excessive number of indoor units connected Check 3 Check 4 To Diagnosis Flow 2 Connection of erroneous models of indoor units Check 3 Check 4 To Diagnosis Flow 3 Defective combination...

Page 332: ...ooting by Indication on the Remote Controller 327 A Check 3 Check 4 To Diagnosis Flow 7 Defective wiring between BS units To Diagnosis Flow 8 Defective wiring between indoor units and BS units Check 3...

Page 333: ...oor units exceeds the standard Check the connection to correct Check if the refrigerant type of the outdoor unit corresponds to that of the indoor unit YES NO Replace the outdoor unit main PCB Match t...

Page 334: ...t PCB is replaced with PCB for spare parts YES Diagnosis Flow 3 Check 3 Check 4 YES NO Check if the spare PCB setting is correct Correct the setting to reset the power Caution Be sure to turn off the...

Page 335: ...oor units is broken or disconnected Correct the connection wirings NO Replace the outdoor unit main PCB Diagnosis Flow 4 Check 3 Check 4 Is the model BS unit connected NO YES Connect the BS unit Repla...

Page 336: ...switch before connecting or disconnecting connectors or parts may be damaged Check 3 Check 4 Diagnosis Flow 6 Is the wiring between the BS units correct NO YES Correct the connection wiring Replace t...

Page 337: ...PCB Error Decision Conditions When any of the followings is detected failure is instantly confirmed When there is a problem in the combination of the indoor and outdoor outside units When there is a...

Page 338: ...ts displaying UA and indoor units connected to the same refrigerant system is within connectable number of unit YES NO There are too many indoor units within the same refrigerant system Does an error...

Page 339: ...ndoor units that can be connected to a single outside unit system depends on the type of outside unit A Does the refrigerant type of indoor and outdoor outside unit match NO Matches the refrigerant ty...

Page 340: ...as that of its own on any other indoor unit Error Decision Conditions The error decision is made as soon as the abnormality aforementioned is detected Supposed Causes Address duplication of centraliz...

Page 341: ...ro computer checks if transmission between indoor unit and centralized remote controller is normal Error Decision Conditions When transmission is not carried out normally for a certain amount of time...

Page 342: ...e UE occurred turned ON NO YES Make correct setting of the centralized control group No NO Check outdoor units to which the refrigerant system is connected Make sure there are no hazardous situations...

Page 343: ...r not there are no problems with the transmission wiring length types of cables and wires number of units connected and others If no problems replace the indoor unit PCB Reset the power supplies of ev...

Page 344: ...etails refer to information in the Procedure for checking broken wires section Abnormal Normal Normal Correct the wiring CHECK 13 Check the transmission wiring with the master unit centralized control...

Page 345: ...master unit transmission equipment using a multiple meter D Is the voltage between the terminals F1 and F2 in the range of 15 2 to 17 6 VDC NO Replace the centralized control equipment Has the master...

Page 346: ...is not corresponding to that of indoor units that have made changes in temperature Error Decision Conditions The error is determined as soon as the abnormality aforementioned is detected through check...

Page 347: ...ves opened NO NO NO YES YES YES Is indoor outdoor and outdoor outdoor unit transmission wiring normal Open the stop valve NO After fixing incorrect wiring press and hold the RESET button on the outdoo...

Page 348: ...models All outdoor unit series Method of Error Detection Detect an indoor unit with no address setting Error Decision Conditions The error decision is made as soon as the abnormality aforementioned is...

Page 349: ...rror occur YES YES NO Normal After fixing incorrect wiring press and hold the RESET button on the outdoor unit main PCB for 5 seconds The unit will not run for up to 12 minutes NO Normal Press and hol...

Page 350: ...r units after initial power supply upon installation or after executing rewiring Keep pressing the RESET button for more than 4 seconds YES Disconnect the outdoor outdoor unit transmission wiring to c...

Page 351: ...e monitor PCB Defective valve coil Defective valve body Defective high pressure sensor Defective indoor unit liquid pipe thermistor Defective service monitor PCB A temperature difference in excess of...

Page 352: ...ure less than 27 C Is the room temperature less than 27 C Is the connector properly connected Are the thermistor resistance characteristics normal Defective outdoor air temperature thermistor of outdo...

Page 353: ...on normal Check for the thermistor resistance and connection Check for the thermistor resistance and connection Is the pressure value checked with the Service Checker corresponding to the measurement...

Page 354: ...onnector properly connected Are the thermistor resistance characteristics normal Is the connector properly connected Are the thermistor resistance characteristics normal Does the piping length fall in...

Page 355: ...r PI control 2 The low pressure protection control includes low pressure protection control and hot gas bypass control 3 In cooling the indoor unit electronic expansion valve is used for superheated d...

Page 356: ...ass valve Are the coil resistance and insulation normal Check if the piping temperature connected to the four way valve is normal Defective subcooling electronic expansion valve control EV2 1 Defectiv...

Page 357: ...or properly connected Are the thermistor resistance characteristics normal Defective valve coil Defective valve body Defective low pressure sensor Defective suction pipe thermistor Defective service m...

Page 358: ...expansion valve 4 Superheating temperature control in heating is conducted by outdoor unit electronic expansion valve EVM 5 Judgement criteria of superheat operation 1 Suction gas superheated degree 1...

Page 359: ...measurement of resistance When using the analog type of multiple tester make measurement in resistance measurement mode in the x1k range z Multiple tester Prepare the analog type of multiple tester Fo...

Page 360: ...ck mode No Measuring point Judgement Criteria Remarks 1 P2 U 1 2V and more Due to condenser charge and so on resistance measurement may require some time 2 P2 V 3 P2 W 4 U P2 0 3 0 7V 5 V P2 6 W P2 7...

Page 361: ...Troubleshooting by Indication on the Remote Controller 356 PCB and Circuit Diagram P3 U V W N3 J1 J2 J3 P1 P1 P2 IGBT X11A U V W L1 L2 L3 X10A DM K2 P3 N3 J1 J2 J3...

Page 362: ...t Defective liquid pipe thermistor of indoor unit Defective service monitor PCB Defective indoor unit electronic expansion valve Defective control Are the coil resistance and insulation normal Are the...

Page 363: ...xcept immediately after compressor starts up or is running under drooping control Use the above values as a guide Depending on the other conditions the unit may be normal despite the values within the...

Page 364: ...f suction gas lowers or the wet operation is performed Consequently the compressor becomes lower in discharge pipe temperature despite of pressure loads 3 The subcooling degree of condensate rises Con...

Page 365: ...ained at a constant level Low pressure rises due to decreased frequency To maintain high pressure frequency decreases under the capacity control High pressure drops or rises immediately after the over...

Page 366: ...it not to demonstrate cooling capacity heating capacity CHECK 7 Cooling High pressure Low pressure Frequency The opening degree of the indoor unit electronic expansion valve becomes larger Either of t...

Page 367: ...tdoor unit electronic expansion valve fully opens and frequency increases Discharge pipe or low pressure drooping control High pressure is maintained at a constant level To maintain low pressure frequ...

Page 368: ...or less If the degree of vacuum does not reach 100 7kPa or less even though evacuation is conducted for a period of two hours moisture will have entered the system or refrigerant leakage will have be...

Page 369: ...00 7kPa or less even though evacuation is conducted for a period of two hours or more repeat vacuum break vacuuming and dehydration 4 Leaving in vacuum state Leave the compressor at the degree of vacu...

Page 370: ...ercurrent of inverter compressor Electronic thermal Compressor overload running An overcurrent of 19 0A or more continues for a period of 5 consecutive seconds or that of 16 1A or more continues for a...

Page 371: ...The inverter power supply voltage is high or low Power supply error Defective inverter PCB P1 Imbalanced power supply Power supply voltages get significantly imbalanced among three phases Power supply...

Page 372: ...r compressor Compressor stops running immediately after it starts up Defective radiation inverter When transmissions between the main PCB and the inverter PCB are not normal Weak current part Heavy cu...

Page 373: ...ec 5 consecutive sec 460V 19 0A 230V 33 5A 460V 16 1A 230V 27 6A 460V 32 3A 230V 59 1A Current Time L5 L8 L8 Max control Error codes related to compressor current Compressor overcurrent Electronic the...

Page 374: ...k T C k 30 354 1 55 5 761 25 259 7 60 4 797 20 192 6 65 4 014 15 144 2 70 3 375 10 109 1 75 2 851 5 83 25 80 2 418 0 64 10 85 2 060 5 49 70 90 1 762 10 38 85 95 1 513 15 30 61 100 1 304 20 24 29 105 1...

Page 375: ...For liquid thermistor For remote controller thermistor T C k T C k 30 361 7719 40 10 6281 25 265 4704 45 8 7097 20 196 9198 50 7 1764 15 147 5687 55 5 9407 10 111 6578 60 4 9439 5 85 2610 65 4 1352 0...

Page 376: ...15 1387 099 80 24 8586 10 1061 098 85 21 1360 5 817 9329 90 18 0377 0 635 0831 95 15 4487 5 496 5712 100 13 2768 10 391 0070 105 11 4395 15 309 9511 110 9 8902 20 247 2696 115 8 5788 25 198 4674 120 7...

Page 377: ...ontroller 372 Pressure Sensor CHECK 12 High Pressure PH Low Pressure PL PH 1 38VH 0 69 PL 0 57VL 0 28 PH High pressure MPa PL Low pressure MPa VH Output Voltage High Side VDC VL Output Voltage Low Sid...

Page 378: ...ort circuited conduct continuity checks between the transmission wiring terminal blocks F1 and F2 of the unified ON OFF controller If there is no continuity as well conduct continuity checks between t...

Page 379: ...ansmission wiring of the Indoor Unit d in the order described If the place with continuity can be identified there may be broken wires in places before the said place with continuity Short circuit bet...

Page 380: ...er unit centralized setting connector z To use two or more centralized controller in combination make settings according to the table shown below CHECK 14 Centralized controller connection pattern Set...

Page 381: ...2 The intelligent Touch Controller centralized remote controller and the unified ON OFF controller have been set to Provided with the master unit centralized setting connector at the factory The sche...

Page 382: ...described in the list of setting of master unit centralized setting connector 1 2 3 4 Pattern 1 00 4 15 Master Slave 5 00 8 15 Master Slave 1 00 4 15 Master Slave 5 00 8 15 Master Slave CRC Master CRC...

Page 383: ...OFF the power supply Measure the resistance between phases of U V W at the motor side connectors three core wire to check that the values are balanced and there is no short circuiting while connector...

Page 384: ...at the motor side connectors five core wire to check that the values are balanced within the range of 20 while connector or relay connector is disconnected Furthermore to use a multiple meter for mea...

Page 385: ...importer distributor and or retailer Cautions on product corrosion 1 Air conditionersshouldnot beinstalledinareaswherecorrosivegases suchasacidgasoralkalinegas areproduced 2 Iftheoutdoorunitistobeinst...