Daikin SUPER MULTI NX G Series, Service Manual

Page 1: ...SiUS12 928_A Applied Models Inverter Multi Heat Pump G Series J Series...

Page 2: ...FTXS15HVJU FTXS18HVJU FDXS09DVJU FDXS12DVJU Outdoor Unit 2MXS18GVJU 3MXS24JVJU 4MXS32GVJU 1 Safety Considerations vii 1 1 Safety Considerations for Repair vii 1 2 Safety Considerations for Users viii...

Page 3: ...ation 33 1 6 Automatic Operation 34 1 7 Thermostat Control 35 1 8 NIGHT SET Mode 36 1 9 HOME LEAVE Operation 37 1 10 INTELLIGENT EYE Operation 38 1 11 Inverter POWERFUL Operation 39 1 12 Other Functio...

Page 4: ...for Diagnosis 91 1 1 Troubleshooting with LED 91 2 Problem Symptoms and Measures 93 3 Service Check Function 94 3 1 ARC452 Series Remote Controller 94 3 2 ARC433 Series Remote Controller 97 4 Code Ind...

Page 5: ...or Unit PCB 24 32 Class 147 5 28 Unspecified Voltage between Indoor and Outdoor Units Anti icing Func tion in Other Rooms 148 6 Check 149 6 1 How to Check 149 Part 7 Removal Procedure 159 1 Outdoor Un...

Page 6: ...21 3 1 Priority Room Setting 221 3 2 COOL HEAT Mode Lock 221 3 3 NIGHT QUIET Mode 222 3 4 When 2 Units are Installed in 1 Room 223 4 Application of Silicon Grease to a Power Transistor and a Diode Bri...

Page 7: ...SiUS12 928_A Table of Contents vi...

Page 8: ...gned specifically for R410A refrigerant systems Never use tools or materials designed for R22 refrigerant systems on an R410A refrigerant system Doing so can cause a serious accident or an equipment f...

Page 9: ...ble and wires may cause an electrical shock or fire Do not use a joined power cable or an extension cord or share the same power outlet with other electrical appliances as it may cause an electrical s...

Page 10: ...SiUS12 928_A 1 List of Functions Part 1 List of Functions 1 Functions 3...

Page 11: ...SiUS12 928_A List of Functions 2...

Page 12: ...Failure 3 D Airflow Self Diagnosis Digital LED Display Comfort Airflow Mode Comfort Control Auto Fan Speed Wiring Error Check Indoor Unit Quiet Operation Anticorrosion Treatment of Outdoor Heat Exchan...

Page 13: ...and Left Fins Self Diagnosis Digital LED Display 3 D Airflow Wiring Error Check Comfort Airflow Mode Anticorrosion Treatment of Outdoor Heat Exchanger Comfort Control Auto Fan Speed Indoor Unit Quiet...

Page 14: ...Power Failure 3 D Airflow Self Diagnosis Digital LED Display Comfort Airflow Mode Wiring Error Check Comfort Control Auto Fan Speed Anticorrosion Treatment of Outdoor Heat Exchanger Indoor Unit Quiet...

Page 15: ...rt after Power Failure 3 D Airflow Self Diagnosis Digital LED Display Comfort Airflow Mode Comfort Control Auto Fan Speed Wiring Error Check Indoor Unit Quiet Operation Anticorrosion Treatment of Outd...

Page 16: ...SiUS12 928_A 7 Specifications Part 2 Specifications 1 Specifications 9 1 1 Indoor Unit 9 1 2 Outdoor Unit 11...

Page 17: ...SiUS12 928_A Specifications 8...

Page 18: ...x 840 x 354 Weight Lbs kg 20 20 Gross Weight Lbs kg 29 29 Operation Sound H M L dBA 44 40 35 44 39 34 44 40 35 44 39 34 Heat Insulation Both Liquid and Gas Pipes Both Liquid and Gas Pipes Piping Conn...

Page 19: ...Connection Liquid in mm 1 4 1 4 6 4 Gas in mm 1 2 12 7 1 2 12 7 Drain in mm 11 16 17 5 11 16 17 5 Drawing No 3D062866A 3D062874A 3D062868A 3D062875A Model FDXS09DVJU FDXS12DVJU Cooling Heating Coolin...

Page 20: ...2 1 2 11 13 16 735 x 825 x 300 Packaged Dimension H W D in mm 31 7 16 39 5 16 15 3 8 799 x 999 x 391 Weight Lbs kg 139 63 Gross Weight Lbs kg 144 65 3 Operation Sound dBA 50 51 Piping Connection Liqui...

Page 21: ...12 5 8 770 x 900 x 321 Packaged Dimension H W D in mm 35 7 8 37 11 16 15 15 16 911 x 957 x 389 Weight Lbs kg 168 76 Gross Weight Lbs kg 196 89 Operation Sound dBA 52 54 Piping Connection Liquid in mm...

Page 22: ...7 16 12 5 8 770 x 900 x 321 Packaged Dimension H W D in mm 35 7 8 37 11 16 15 15 16 911 x 957 x 389 Weight Lbs 168 76 Gross Weight Lbs 196 89 Operation Sound dBA 52 54 Piping Connection Liquid in mm...

Page 23: ...SiUS12 928_A Specifications Specifications 14...

Page 24: ...m Part 3 Printed Circuit Board Connector Wiring Diagram 1 Printed Circuit Board Connector Wiring Diagram 13 1 1 Indoor Unit Duct Free System 13 1 2 Indoor Unit Slim Duct Built in System 15 1 3 Outdoor...

Page 25: ...SiUS12 928_A Printed Circuit Board Connector Wiring Diagram 16...

Page 26: ...l receiver PCB 7 S32 Connector for indoor heat exchanger thermistor 8 S35 Connector for INTELLIGENT EYE sensor PCB 9 H1 H2 H3 FG Connector for terminal board 10 JA Address setting jumper JB Fan speed...

Page 27: ...g Diagram 18 PCB Detail PCB 1 Control PCB PCB 2 Signal Receiver PCB PCB 3 Buzzer PCB PCB 4 Display PCB PCB 5 INTELLIGENT EYE Sensor PCB S1 V1 FU1 S6 S8 2P099167 1 JC JB JA LED A S21 S35 H1 S26 S28 H2...

Page 28: ...nnector for indoor heat exchanger thermistor 6 H1 H2 H3 GND Connector for terminal board 7 JA Address setting jumper JB Fan speed setting when compressor stops for thermostat OFF JC Power failure reco...

Page 29: ..._A Printed Circuit Board Connector Wiring Diagram Printed Circuit Board Connector Wiring Diagram 20 PCB Detail PCB 1 Control PCB PCB 2 Display PCB S1 H2 S7 S26 S32 JC JB JA S21 2P131149 1 LED A FU1 H1...

Page 30: ...thermistors outdoor temperature outdoor heat exchanger discharge pipe 11 S91 Connector for fin thermistor 12 S92 Connector for gas pipe thermistor 13 S93 Connector for liquid pipe thermistor 14 AC1 AC...

Page 31: ...S34 S72 Connector for main PCB 2 S70 Connector for outdoor fan motor 3 FU201 Fuse 3 15 A 250 V 4 W V U N Connector for compressor 1 CN11 CN14 Connector for main PCB 2 L1 L2 Connector for reactor S10 S...

Page 32: ...rd Connector Wiring Diagram SiUS12 928_A 23 Printed Circuit Board Connector Wiring Diagram MID1 MID2 Inverter PCB SPM 3P080081 2 V3 HN HE FU1 HL S11 W V U N S34 S72 S70 FU201 3 15A 3P080085 1 3EB10032...

Page 33: ...Connector for outdoor fan motor 10 S80 Connector for four way valve coil 11 S90 Connector for thermistors outdoor temperature outdoor heat exchanger discharge pipe 12 S92 Connector for gas pipe therm...

Page 34: ...r Wiring Diagram PCB Detail PCB 1 Main PCB PCB 2 Service Monitor PCB E1 E2 FU2 V3 HR1 white blue V100 HR2 FU3 2P209947 1 2P209947 2 S40 S20 S21 S22 S23 S70 S90 S92 S93 S51 W V U S15 AC2 blue S101 S10...

Page 35: ...SiUS12 928_A Printed Circuit Board Connector Wiring Diagram Printed Circuit Board Connector Wiring Diagram 26...

Page 36: ...Operation 38 1 11 Inverter POWERFUL Operation 39 1 12 Other Functions 40 2 Function of Thermistor 42 3 Control Specification 44 3 1 Mode Hierarchy 44 3 2 Frequency Control 45 3 3 Controls at Mode Cha...

Page 37: ...SiUS12 928_A Function and Control 28...

Page 38: ...mal operation The target frequency is set by the following 2 parameters coming from the operating indoor unit The load condition of the operating indoor unit The difference between the room thermistor...

Page 39: ...nce the set temperature is reached the energy saving operation enables to maintain the room temperature at low power Frequency Limits The following functions regulate the minimum and maximum frequency...

Page 40: ...t guarantees a comfortable air distribution Auto Swing The following table explains the auto swing process for cooling dry fan and heating 3 D Airflow Alternative repetition of vertical and horizontal...

Page 41: ...ilable The airflow rate is automatically controlled within this range when the FAN setting button is set to automatic Cooling The following drawing explains the principle of fan speed control for cool...

Page 42: ...ature is divided into two zones Then the unit operates in dry mode with an appropriate capacity for each zone to maintain the temperature and humidity at a comfortable level Room thermistor temperatur...

Page 43: ...erature Tt Ts 18 30 C 64 86 F 2 The target temperature Tt is calculated as Tt Ts C where C is the correction value C 0 C 0 F Cooling operation C 2 C 3 6 F Heating operation 3 Thermostat ON OFF point a...

Page 44: ...ling Dry 10 minutes Heating 10 seconds Cooling Dry Duct Free System Slim Duct Built in System Heating Duct Free System Slim Duct Built in System Refer to Temperature Control on page 29 for detail B A...

Page 45: ...heating in winter to ensure comfortable sleeping conditions and also conserves electricity Cooling Duct Free System Slim Duct Built in System Heating R11588 Target temperature 0 5 C 0 9 F 0 5 C 0 9 F...

Page 46: ...ails of Function A mark representing HOME LEAVE is indicated on the display of the remote controller The indoor unit is operated according to the set temperature and airflow rate for HOME LEAVE which...

Page 47: ...rocomputer does not have a signal from the sensor in 20 minutes it determines no activity in the room and operates the unit within temperature shifted from the target temperature Cooling 2 C 3 6 F hig...

Page 48: ...Ex POWERFUL operation in cooling mode Operation mode Fan speed Target temperature COOL H tap 90 rpm 18 C 64 F DRY Dry rotating speed 50 rpm Lowered by 2 C 3 6 F HEAT H tap 90 rpm 30 C 86 F FAN H tap 9...

Page 49: ...3 Indoor Unit ON OFF Button An ON OFF button is provided on the display of the unit Press this button once to start operation Press once again to stop it This button is useful when the remote controll...

Page 50: ...surface area allows the filter to effectively trap microscopic particles decompose odors and eliminate bacteria and viruses even in large living rooms The filter can be used for approximately 3 years...

Page 51: ...stor 2MXS18GVJU 3MXS24JVJU 4MXS32GVJU SV D Four way valve Compressor Defrost solenoid valve EVB EVA Receiver Expansion valve A B C D E Four way valve Compressor EVB EVC EVA Expansion valve A B C D E R...

Page 52: ...e up protection control If the indoor heat exchanger temperature drops abnormally the operating frequency becomes lower or the operation halts 3 In cooling operation the indoor heat exchanger thermist...

Page 53: ...outdoor unit is made during forced operation Determine Operation Mode The system detects the operation mode command which is set by each room in accordance with the procedure and determines the operat...

Page 54: ...upper limit frequency The minimum value is set as the upper limit frequency among the frequency upper limits of the following functions Compressor protection input current discharge pipe temperature...

Page 55: ...cy is adjusted according to the D value When the D value is small lower the frequency When the D value is large increase the frequency 3 Limit of frequency variation width When the difference between...

Page 56: ...hen heating is stopped as the four way valve coil switches from ON to OFF the OFF delay switch of the four way valve is carried out after the operation stopped Detail OFF delay switch of four way valv...

Page 57: ...turning off Except when defrosting 3 3 5 Compressor Protection Function When turning the compressor from OFF to ON the upper limit of frequency is set as follows The function is not used when defrost...

Page 58: ...er 2 5 seconds in this zone the compressor is stopped Dropping zone The upper limit of the compressor frequency is defined as operation frequency 2 Hz After this the output frequency is pulled down by...

Page 59: ...2 minutes after the operation starts and seconds after the number of operation room is changed The maximum value of the indoor heat exchanger temperature controls the following excluding stopped room...

Page 60: ...outdoor fan is reduced by the command of indoor outdoor quiet operation 7 Fan control when the number of heating rooms decreases When the outdoor temperature is more than 10 C 50 F the fan is turned o...

Page 61: ...ition temperature is selected in the range of 4 12 C 39 54 F according to the outdoor temperature The defrost operation operates120 seconds after the start A B Then the defrost operation stops at the...

Page 62: ...othermal control 2 SC subcooling control 3 Liquid pipe temperature control with all ports connected and all rooms being air conditioned 4 Liquid pipe temperature control for stopped rooms 5 Condensati...

Page 63: ...l of target discharge pipe temperature Control when the operating room is changed Control of target discharge pipe temperature Defrost control Pressure equalizing control Open control when starting Co...

Page 64: ...ted or liquid back to the compressor 3 12 5 High Discharge Pipe Temperature When the compressor is operating if the discharge pipe temperature exceeds a certain value the electronic expansion valve op...

Page 65: ...is target SC close the electronic expansion valve of the room Detail Start Conditions When the starting control 630 seconds finishes all of the electronic expansion valve s in the operating room are...

Page 66: ...equency is changed for a specified value in a certain time period the target discharge pipe temperature control is canceled and the target opening of the electronic expansion valve is changed 3 13 Mal...

Page 67: ...than the target discharge pipe temperature and the electronic expansion valve is fully open for more than the specified time it is regarded as a refrigerant shortage Refer to Refrigerant shortage on...

Page 68: ...outdoor unit is the stop mode 4 The operation mode switch SW2 on the outdoor unit is set to the cooling mode 4 The operation mode switch SW2 on the outdoor unit is set to the heating mode Start Press...

Page 69: ...SiUS12 928_A Control Specification Function and Control 60...

Page 70: ...Direction 68 2 4 INTELLIGENT EYE Operation 70 2 5 POWERFUL Operation 72 2 6 OUTDOOR UNIT Quiet Operation 73 2 7 HOME LEAVE Operation 74 2 8 TIMER Operation 76 2 9 Note for Multi System 78 3 Slim Duct...

Page 71: ...SiUS12 928_A Operation Manual 62...

Page 72: ...l or heat well and how to use it most efficiently Providing instructions to the user can reduce requests for servicing by 80 However proficient the installation and operating functions of the AC syste...

Page 73: ...SiUS12 928_A Duct Free System Operation Manual 64 2 Duct Free System 2 1 Remote Controller...

Page 74: ...Duct Free System SiUS12 928_A 65 Operation Manual Cancels the timer setting Changes the ON OFF Selects the operation mode INTELLIGENT EYE operation...

Page 75: ...ct a operation mode Each pressing of the button advances the mode setting in sequence AUTO DRY COOL HEAT FAN 2 Press ON OFF button The OPERATION lamp lights up To stop operation 3 Press ON OFF button...

Page 76: ...room gets warmer In heating operation frost may occur on the outdoor unit and lower the heating capacity In that case the system switches into defrosting operation to remove the frost During defrosti...

Page 77: ...e LCD is no longer displayed on the LCD To adjust the louvers horizontal blades When the louvers have reached the desired position is displayed on the LCD and the louvers begin to swing The louvers wi...

Page 78: ...69 Operation Manual Using 3 D airflow circulates cool or warm air to prevent the accumulation of too much cool air on the floor of a room or too much warm air rising to the room s ceiling assuring a...

Page 79: ...928_A Duct Free System Operation Manual 70 2 4 INTELLIGENT EYE Operation is no longer displayed on the LCD detecting movement detects movement again is displayed on the LCD The set temperature is shif...

Page 80: ...s on passing vehicles COMFORT AIRFLOW Do not hit or forcibly push the INTELLIGENT EYE sensor This can lead to damage and malfunction Do not place large objects near the sensor Also keep heating units...

Page 81: ...SiUS12 928_A Duct Free System Operation Manual 72 2 5 POWERFUL Operation is no longer displayed on the LCD is no longer displayed on the LCD...

Page 82: ...Duct Free System SiUS12 928_A 73 Operation Manual 2 6 OUTDOOR UNIT Quiet Operation is no longer displayed on the LCD...

Page 83: ...SiUS12 928_A Duct Free System Operation Manual 74 2 7 HOME LEAVE Operation is no longer displayed on the LCD...

Page 84: ...Duct Free System SiUS12 928_A 75 Operation Manual...

Page 85: ...SiUS12 928_A Duct Free System Operation Manual 76 2 8 TIMER Operation...

Page 86: ...Duct Free System SiUS12 928_A 77 Operation Manual...

Page 87: ...SiUS12 928_A Duct Free System Operation Manual 78 2 9 Note for Multi System...

Page 88: ...Duct Free System SiUS12 928_A 79 Operation Manual...

Page 89: ...RE adjustment buttons It changes the temperature setting 6 ON OFF button Press this button once to start operation Press once again to stop it 7 MODE selector button It selects the operation mode AUTO...

Page 90: ...select a operation mode Each pressing of the button advances the mode setting in sequence AUTO DRY COOL HEAT FAN 2 Press ON OFF button The OPERATION lamp lights up To stop operation 3 Press ON OFF but...

Page 91: ...e the room gets warmer In heating operation frost may occur on the outdoor unit and lower the heating capacity In that case the system switches into defrosting operation to remove the frost During def...

Page 92: ...LCD NOTE Notes on POWERFUL operation POWERFUL Operation cannot be used together with QUIET Operation Priority is given to the function of whichever button is pressed last POWERFUL Operation can only...

Page 93: ...UNIT QUIET operation 2 Press QUIET button again disappears from the LCD NOTE No te on OUTDOOR UNIT QUIET operation This function is available in COOL HEAT and AUTO modes This is not available in FAN a...

Page 94: ...e for HOME LEAVE operation When using HOME LEAVE operation for the first time set the temperature and airflow rate for HOME LEAVE operation Record your preferred temperature and airflow rate 1 Press H...

Page 95: ...eration section above HOME LEAVE operation is only available in COOL and HEAT mode Cannot be used in AUTO DRY and FAN mode HOME LEAVE operation runs in accordance with the previous operation mode COOL...

Page 96: ...tting by 10 minutes Holding down either button changes the setting rapidly 3 Press OFF TIMER button again The TIMER lamp lights up To cancel the OFF TIMER operation 4 Press CANCEL button The TIMER lam...

Page 97: ...SiUS12 928_A Slim Duct Built In System Operation Manual 88...

Page 98: ...ts 112 5 9 Anti icing Function 113 5 10 Outdoor Unit PCB Abnormality 24 32 Class 115 5 11 OL Activation Compressor Overload 116 5 12 Compressor Lock 117 5 13 DC Fan Lock 118 5 14 Input Overcurrent Det...

Page 99: ...SiUS12 928_A Service Diagnosis 90...

Page 100: ...ion lamp blinks it could be operation mode conflict Check the following Are the operation modes all the same for the indoor units connected to multi system outdoor unit If not set all the indoor units...

Page 101: ...utdoor unit PCB The LED A indicates microcomputer operation condition In normal condition the LED A is blinking and the LED 1 LED 4 are OFF Even after the error is canceled and the unit operates in no...

Page 102: ...eration cannot be used when the outdoor temperature is below 10 C 14 F Diagnose with outdoor unit LED indication 102 Some indoor units do not operate Check the type of the indoor units Check to make s...

Page 103: ...uence shown below Note 1 A short beep and two consecutive beeps indicate non corresponding codes 2 To return to the normal mode hold the timer cancel button down for 5 seconds When the remote controll...

Page 104: ...the figure until you hear the sound of beep or beep beep 3 Diagnose by the sound beep The left digit does not correspond with the error code beep beep The figure of the left digit corresponds with th...

Page 105: ...long beep Both digits correspond with the error code 7 Determine the error code The figures indicated when you hear the beepare error codes Error codes and description Refer to page 100 8 Press the M...

Page 106: ...uence shown below Note 1 A short beep beep and two consecutive beeps indicate non corresponding codes 2 To return to the normal mode hold the timer cancel button down for 5 seconds When the remote con...

Page 107: ...e TEMP or button and change the figure until you hear the beep 3 Diagnose by the sound beep The left side digit does not correspond with the error code beep beep The left digit corresponds with the er...

Page 108: ...long beep Both digits correspond with the error code 7 Determine the error code The figures indicated when you hear the beepare error codes Error codes and description Refer to page 100 8 Press the M...

Page 109: ...r related abnormality C9 Room temperature thermistor or related abnormality Outdoor Unit A5 Anti icing function E1 Outdoor unit PCB abnormality E5 OL activation compressor overload E6 Compressor lock...

Page 110: ...ze up protection control or heating peak cut control 104 A6 Fan motor or related abnormality AC motor Slim duct built in 106 DC motor Duct free 107 C4 Indoor heat exchanger thermistor or related abnor...

Page 111: ...148 UH Anti icing function in other rooms 148 5 3 3 4 4 U0 Refrigerant shortage 143 U2 Low voltage detection or over voltage detection 146 U7 Signal transmission error on outdoor unit PCB 24 32 class...

Page 112: ...shooting Note Check the following connector Check the combination of the indoor and outdoor unit OK Check the connection of connectors See Note Correct the connection OK Error repeats YES NO NO YES NO...

Page 113: ...ion the temperature detected by the indoor heat exchanger thermistor is used for the heating peak cut control operation halt outdoor fan stop etc Malfunction Decision Conditions Freeze up protection c...

Page 114: ...indoor heat exchanger thermistor YES YES R7131 YES YES NO Caution Provide sufficient air passage Clean the air filter Clean the indoor heat exchanger Replace the indoor unit PCB Replace the thermisto...

Page 115: ...ck No 16 Refer to P 158 NO NO NO Check No 16 Check Hall IC NO NO NO YES YES YES YES YES YES R11411 Caution Replace the fan motor or the indoor unit PCB Replace the fan motor Replace the indoor unit PC...

Page 116: ...d to determine abnormal fan motor operation Malfunction Decision Conditions The detected rotation speed does not reach the demanded rotation speed of the target tap and is less than 50 of the maximum...

Page 117: ...e Is the motor power supply voltage 310 340 VDC generated Is the motor control voltage 15 VDC generated Turn off the power supply and rotate the fan by hand Turn the power on and start operation Be su...

Page 118: ...r operation Supposed Causes Disconnection of connector Defective thermistor Defective indoor unit PCB Troubleshooting Check No 06 Refer to P 152 C4 Indoor heat exchanger thermistor C9 Room temperature...

Page 119: ...it in indoor unit outdoor unit signal transmission is checked whether it is normal Malfunction Decision Conditions The data sent from the outdoor unit cannot be received normally or the content of the...

Page 120: ...ance of the power supply waveform and correct it NO R11706 NO YES YES NO NO Caution Correct the indoor unit outdoor unit connection wires Diagnose the outdoor unit PCB Replace the connection wires bet...

Page 121: ...ring of connecting wires Wrong indoor unit PCB or outdoor unit PCB mounted Defective indoor unit PCB Defective outdoor unit PCB Troubleshooting R11707 Caution NO YES YES YES NO NO Check the code numbe...

Page 122: ...ted in a shut down room Malfunction Decision Conditions In cooling operation the both conditions A and B are met for 5 minutes A Room thermistor temperature Indoor heat exchanger temperature 10 C 18 F...

Page 123: ...om the piping after drawing a vacuum Activate the wiring error check mode Replace the electronic expansion valve or coil Replace the outdoor heat exchanger thermistor Replace the room temperature ther...

Page 124: ...uter is in abnormal running order Supposed Causes Noise Momentary fall of voltage Momentary power failure Defective outdoor unit PCB Troubleshooting R7183 Caution Be sure to turn off the power switch...

Page 125: ...P 150 Check No 05 Refer to P 151 Check No 06 Refer to P 152 Check No 11 Refer to P 155 R7137 Caution YES Malfunctioning Discharge pipe thermistor NO Functioning Functioning Malfunctioning Refrigerant...

Page 126: ...sor locked Troubleshooting Turn off the power Disconnect the harnesses U V and W R11301 Caution NO YES YES NO NO YES Check with the inverter checker Turn off the power and reconnect the harnesses Turn...

Page 127: ...ithout any other error Supposed Causes Defective fan motor Disconnection of the fan motor Foreign matters stuck in the fan Troubleshooting Check No 15 Refer to P 157 R11708 Caution YES YES NO YES NO N...

Page 128: ...y checking the input current value Malfunction Decision Conditions The input current is at a certain value depending on the condition for 2 5 seconds The compressor halts if the error occurs and resta...

Page 129: ...ain circuit electrolytic capacitor Check No 08 Check the discharge pressure Check No 07 Check the installation condition Check with the inverter checker Turn off the power and disconnect the harnesses...

Page 130: ...on within their normal ranges in the operating mode Malfunction Decision Conditions Either of the following conditions occurs 6 minutes after the compressor has started Cooling operation Lowest temper...

Page 131: ...edure Replace the four way valve defective or dust clogged Reconnect them in position Caution R11931 Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be...

Page 132: ...stor or outdoor temperature thermistor Defective outdoor unit PCB Water mixed in refrigerant Defective electronic expansion valve Defective stop valve Troubleshooting Check No 04 Refer to P 150 Check...

Page 133: ...r heat exchanger thermistor exceeds the limit Malfunction Decision Conditions The temperature sensed by the outdoor heat exchanger thermistor rises above The error is cleared when the temperature drop...

Page 134: ...outdoor unit PCB Replace the electronic expansion valve or the coil Replace the outdoor unit PCB Clean the outdoor heat exchanger Change the installation location or direction Check the installation...

Page 135: ...t condition is identified by the compressor current which is detected right after the compressor startup If the error repeats 16 times the system is shut down Reset condition Continuous run for about...

Page 136: ...om the outdoor unit PCB and measure the resistance value between reactor terminals with tester Disconnect the compressor relay harness from the outdoor unit PCB and measure the resistance value betwee...

Page 137: ...checking the compressor running condition through the position detection circuit Malfunction Decision Conditions If the error repeats 8 times the system is shut down Reset condition Continuous run fo...

Page 138: ...NO NO NO YES YES NO YES YES Check No 29 Check the short circuit of the diode bridge Check with the inverter checker Turn off the power Disconnect the harnesses U V and W Turn on the power Check the el...

Page 139: ...rrect the power supply Voltage as rated R11471 NO NO YES NO YES YES Check with the inverter checker Turn off the power Disconnect the harnesses U V and W Turn on the power Check the electrolytic capac...

Page 140: ...g frequency and CT detected input current Malfunction Decision Conditions The compressor running frequency is more than Hz and input current is below A If the error repeats 4 times the system is shut...

Page 141: ...power again and restart operation Compressor running 320 30 VDC Any LED OFF Running current as shown at right with relay cable 1 or 2 Voltage within the allowable range Supply voltage 15 Replace the...

Page 142: ...thermistor Malfunction Decision Conditions The thermistor input is above 4 96 V or below 0 04 V with the power on J3 error is judged if the discharge pipe temperature is lower than the heat exchanger...

Page 143: ...emperature is lower than the heat exchanger Replace defective one s of the following thermistors Radiation fin thermistor Discharge pipe thermistor Outdoor heat exchanger thermistor Liquid pipe thermi...

Page 144: ...nction Decision Conditions With the compressor off the radiation fin temperature is above The error is cleared when the temperature drops below To cool the electrical components the outdoor fan starts...

Page 145: ...erature Check No 07 Check the installation condition Radiation fin dirty Does the temperature exceed the temperature to stop operation Thermistor as specified in its characteristic chart Check No 06 C...

Page 146: ...emperature rises above and stops when it drops below R11713 YES NO Slightly dirty NG Too dirty OK NO YES Turn off the power and turn it on again Check the radiation fin temperature Check No 07 Check t...

Page 147: ...adiation fin temperature with the compressor on is above The error is cleared when the temperature drops below If the error repeats the system is shut down Reset condition Continuous run for about 60...

Page 148: ...n NO YES YES Above Radiation fin dirty Thermistor as specified in its characteristic chart Check No 06 Check the thermistor resistance value Check No 09 Check the outdoor unit fan or related Error dis...

Page 149: ...start the system Check the radiation fin temperature Check No 07 Check the installation condition NO YES YES Radiation fin dirty Above Check No 09 Check the outdoor fan or related Error displayed agai...

Page 150: ...signal error occurs while the compressor is running A speed error occurs while the compressor is running An output overcurrent signal is fed from the output overcurrent detection circuit to the microc...

Page 151: ...Check No 07 Check the installation condition Check with the inverter checker Turn off the power and disconnect the harnesses U V and W Turn off the power and reconnect the harnesses Turn on the power...

Page 152: ...utes 18 class DC current x DC voltage x Compressor output frequency Output frequency 24 32 class DC current x Compressor output frequency Output frequency Refrigerant shortage detection II The followi...

Page 153: ...nic expansion valve functioning Replace them in position CT in trouble refer to H8 Replace the compressor Repair the pipe flare or replace the union Check the power transistor harness for looseness Co...

Page 154: ...valve Repair the pipe flare or replace the union Check the power transistor harness for looseness Correct it as required Also replace the cracked pipe Check the pipes for improper contact Correct the...

Page 155: ...tage detection circuit to the microcomputer The compressor stops if the error occurs and restarts automatically after 3 minute standby Supposed Causes Supply voltage is not as specified Defective DC v...

Page 156: ...determined when the data sent from the PM1 can not be received for 9 seconds The error counter is reset when the data from the PM1 can be successfully received Supposed Causes Defective outdoor unit P...

Page 157: ...voltages Mismatching of indoor and outdoor units Supposed Causes Anti icing function in other rooms Wrong models interconnected Wrong indoor unit PCB or outdoor unit PCB mounted Troubleshooting Note R...

Page 158: ...ector 2 Check motor power supply voltage output pins 4 7 3 Check motor control voltage pins 4 3 4 Check rotation command voltage output pins 4 2 5 Check rotation pulse input pins 4 1 7 6 5 4 3 2 1 Mot...

Page 159: ...that the latching sound varies depending on the valve type If the system keeps operating with a defective electronic expansion valve the following problem may occur Valveopening position Possible pro...

Page 160: ...the power and turn it on again Disconnect the connector for the four way valve coil and check the continuity Start heating operation Four way valve coil Cooling dry No continuity Heating Continuity Re...

Page 161: ...tance is shown in the graph and the table below For the models in which the thermistor is directly mounted on the PCB disconnect the connector for the PCB and measure Thermistor R25 C 77 F 20 k B 3950...

Page 162: ...irflow blocked by obstacles or winds blowing in the opposite direction Does the discharged air from other outdoor unit cause an increase of the suction air temperature Change the installation location...

Page 163: ...exchanger dirty Is the connection pipe deformed Is the stop valve open High Replace the compressor Open the stop valve Replace the pipe installed at the site Clean the dirty one Replace the compressor...

Page 164: ...r supply waveform is a sine wave Fig 1 Check to see if there is waveform disturbance near the zero cross sections circled in Fig 2 6 1 9 Inverter Units Refrigerant System Check Check No 11 Fig 1 Fig 2...

Page 165: ...Fan motor lead wire Four way valve coil lead wire Thermistor lead wire Liquid pipe Thermistor lead wire Gas pipe Thermistor lead wire Overload protector lead wire Reactor lead wire Compressor lead wi...

Page 166: ...nd power off Disconnect the connector S70 2 Check that the voltage between the pins 4 7 is 320 VDC 3 Check that the control voltage between the pins 3 4 is 15 VDC 4 Check that the rotation command vol...

Page 167: ...n step 2 Defective Hall IC Replace the fan motor If OK in both steps 1 and 2 Replace the PCB 6 1 15 Main Circuit Short Check Check No 29 Measure the resistance between pins at both ends of DB1 If the...

Page 168: ...ket 171 1 6 Removal of the Coils and Thermistors 173 1 7 Removal of the Four Way Valve and Defrost Solenoid Valve Procedure 175 1 8 Removal of the Compressor 177 2 Outdoor Unit 3MXS24JVJU 4MXS32GVJU 1...

Page 169: ...SiUS12 928_A Removal Procedure 160...

Page 170: ...minutes or more after turning off all power supplies before disassembling work Step Procedure Points 1 External appearance 2 Remove the 4 screws of the top panel and the 6 screws of the front panel 3...

Page 171: ...he figure shows the connection wires 2 Remove the terminal board fixing screw Remove all screws of the connection wires to enable removal Remove the screw of the ground wire Match the colors of the co...

Page 172: ...2 Disconnect the four way valve coil connector S80 3 Disconnect the thermistor connectors S90 S92 S93 and the overload protector connector S40 S40 Overload protector S90 Thermistor Outdoor temperature...

Page 173: ...re 164 5 Disconnect the reactor lead wires 3 Removal of the electrical box 1 Remove the 1 screw on the right side of the electrical box 2 Remove the 1 screw on the front of the electrical box 3 Remove...

Page 174: ...GVJU SiUS12 928 165 Removal Procedure 4 Disconnect the connector for the fan motor S70 from the inverter PCB Rlease the fan motor lead wire 5 Lift up the electrical box and dismount it Step Procedure...

Page 175: ...s or more after turning off all power supplies before disassembling work Step Procedure Points 1 Removal of the control PCB 1 Remove the 1 screw of the PCB and unfasten the 2 hooks 2 Unfasten the hook...

Page 176: ...nit 2MXS18GVJU SiUS12 928 167 Removal Procedure 4 Disconnect the connectors on the service monitor PCB S52 S102 Unfasten the hooks to remove the service monitor PCB 5 Lift up the main PCB Step Procedu...

Page 177: ...Removal Procedure 168 6 Disconnect the connectors S31 S32 S33 S71 H1 H2 For details refer to page 21 7 The figure shows the main PCB FU2 Glass tube fuse 3 15A Step Procedure Points S31 S71 S33 R10362...

Page 178: ...emove the service monitor PCB 9 Remove the 7 screws to remove the inverter PCB Step Procedure Points Priority room setting switch SW4 Wiring error check switch SW3 Forced operation ON OFF switch SW1 N...

Page 179: ...and release the fan motor lead wire When reassembling align mark of propeller fan with D cut section of motor shaft Nut size M6 Spanner size 10mm 1 Remove the washer fitted nut and remove the outdoor...

Page 180: ...Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work Step Procedure Points 1 Remove the 5 screws of the right side panel 2 Remove the 2 s...

Page 181: ...Remove the sound blankets top upper top inner outer and inner Step Procedure Points Sound blanket top upper Sound blanket top inner Sound blanket inner Sound blanket outer R10366 Carefully remove the...

Page 182: ...four way valve coil 2 Remove the screw and remove the defrost solenoid valve coil 3 Pull out the electronic expansion valve coil for each room Place the thermistor so that its end comes up to the end...

Page 183: ...p to the end of the fixture Be careful not to lose the clip or fixture for thermistors 6 Remove the wire harnesses S90 Outdoor temperature thermistor Blue Outdoor heat exchanger thermistor Gray Discha...

Page 184: ...on brazing 2 It is required to prevent the carbonization of oil inside the four way valve and the deterioration of the gaskets affected by the heat keep below 120 C 248 F Wrap the four way valve with...

Page 185: ...rated Reassembling precautions Wrap the four way valve with wet cloth Splash water over the cloth before it dries to prevent the valve from being overheated 6 Disconnect the 2 brazed points first e an...

Page 186: ...supplies before disassembling work Step Procedure Points 1 2 Remove the terminal cover Disconnect the compressor lead wires 3 Remove the 2 sheets of putty Be careful to avoid burning the compressor t...

Page 187: ...ation of the oil inside the four way valve and the deterioration of the gaskets affected by heat Keep below 120 C 248 F Wrap the four way valve with a wet cloth and provide water so that the cloth doe...

Page 188: ...re Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work Step Procedure Points 1 External appearance 1 Removal of the suction grille The hooks are s...

Page 189: ...0 2 Slide the suction grille downward to unfasten the 3 top hooks 3 Remove the suction grille 2 Removal of the top panel 1 Remove the 4 screws on the back and the 1 screw on the left side panel Step P...

Page 190: ...val Procedure 2 Remove the 2 screws on the front and the 1 screw on the right side panel 3 Lift the top panel and remove it 3 Removal of the right side panel 1 Remove the 5 screws Step Procedure Point...

Page 191: ...SiUS12 928 Outdoor Unit 3MXS24JVJU 4MXS32GVJU Removal Procedure 182 2 Slide the panel downward to release the 2 hooks on the back side Step Procedure Points R6377 Hooks R6378 Hooks R6379...

Page 192: ...ove the right side panel The US model has a service lid on the stop valve mounting plate Remove the 2 screws to remove the service lid 4 Removal of the front panel 2 This screw is M5 16 1 Remove the 2...

Page 193: ...SiUS12 928 Outdoor Unit 3MXS24JVJU 4MXS32GVJU Removal Procedure 184 2 Slide the front panel 2 panel downward to unfasten the hook 3 Remove the front panel 2 Step Procedure Points R10374 R6383 R10375...

Page 194: ...al of the front panel 1 Remove the discharge grille and propeller fan first to remove the front panel 1 1 Remove the 4 screws on the discharge grille 2 Pull the bottom of the discharge grille toward y...

Page 195: ...e 186 3 Slide the discharge grille downward to unfasten the 2 hooks at the top 4 Remove the discharge grille 5 Remove the washer fitted nut and remove the outdoor fan Nut size M8 Step Procedure Points...

Page 196: ...187 Removal Procedure 6 Remove the 2 screws on the partition plate 1 7 Remove the screw at the bottom left of the front 8 Remove the screw at the bottom of the left side Step Procedure Points R10382...

Page 197: ...US12 928 Outdoor Unit 3MXS24JVJU 4MXS32GVJU Removal Procedure 188 9 Remove the screw at the bottom of the back side 10 Lift the front panel 1 to unfasten the hook Step Procedure Points R6394 R10384 Ho...

Page 198: ...val Procedure 11 Remove the front panel 1 Be sure to detach the front panel 1 carefully so as not to deform it 6 Removal of the rear panel 1 Remove the screw on the partition plate 2 Step Procedure Po...

Page 199: ...emoval Procedure 190 2 Slide the partition plate 2 to the left and remove it 3 Undo the holder of the thermistor The holder is secured in the clearances of the heat exchanger fins Step Procedure Point...

Page 200: ...JU 4MXS32GVJU SiUS12 928 191 Removal Procedure 4 Release the thermistor wire from the groove 5 Remove the 3 screws on the rear panel 6 Remove the screw on the bottom frame Step Procedure Points Groove...

Page 201: ...VJU Removal Procedure 192 7 Remove the screw on the stop valve mounting plate 8 Lift the rear panel upward to unfasten the 2 hooks 9 Remove the rear panel Step Procedure Points R10392 Stop valve mount...

Page 202: ...rical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work Step Procedure Points 1 Remove the 2 screws to detach the grounds 2 Discon...

Page 203: ...for the electronic expansion valve coils for room A B C D A S20 white B S21 red C S22 blue D S23 yellow The 3MXS model does not have S23 6 Disconnect the connector for the liquid pipe thermistor S93 P...

Page 204: ...e thermistors S90 Pull out the clamp 9 The wire harness of the thermistors is hooked under the electrical box Unhook it and pull out the clamp Pull out the clamp 10 Disconnect the connector for the ov...

Page 205: ...U Removal Procedure 196 11 The wire harness for the compressor is attached to the partition plate 1 by the clamp 12 Pull out the clamp with pliers 13 Disconnect the relay connector of the compressor S...

Page 206: ...ove the screw on the stop valve mounting plate 15 Remove the screw on the partition plate 1 16 Slide the electrical box leftward to unfasten the hook on the right side Step Procedure Points R10395 Ele...

Page 207: ...SiUS12 928 Outdoor Unit 3MXS24JVJU 4MXS32GVJU Removal Procedure 198 17 Lift up the electrical box to remove it Step Procedure Points R10402...

Page 208: ...wait 10 minutes or more after turning off all power supplies before disassembling work Step Procedure Points 1 Removal of the control PCB 1 Open the cover of the electrical box Unfasten the 4 hooks Th...

Page 209: ...or details S51 S101 service monitor PCB S10 terminal board transmission HR1 HR2 reactor AC1 AC2 terminal board power supply U V W compressor 6 Remove the main PCB 2 Removal of the reactor 1 Remove the...

Page 210: ...move the 3 screws and lift the reactor upward to remove it 3 Removal of the service monitor PCB 1 Disconnect the connectors from the service monitor PCB S52 S102 2 Slightly lift the top hook to unfast...

Page 211: ...24JVJU 4MXS32GVJU Removal Procedure 202 3 Unfasten the bottom hook to remove the service monitor PCB 4 Removal of the terminal board 1 Remove the screw 2 Unfasten the hook Step Procedure Points R6437...

Page 212: ...Outdoor Unit 3MXS24JVJU 4MXS32GVJU SiUS12 928 203 Removal Procedure 3 Remove the terminal board Step Procedure Points R10413...

Page 213: ...rk Step Procedure Points 1 2 Remove the 2 lower screws at the bottom Remove the 2 upper screws Be sure to remove the lower screws first If the upper screws are removed first the fan motor may tilt or...

Page 214: ...nd Thermistors Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work Step Procedure Points 1 Removal of the electronic expansion valve coi...

Page 215: ...VJU 4MXS32GVJU Removal Procedure 206 2 Removal of the thermistors Be careful not to lose the clips for the thermistors 1 Pull out the gas pipe thermistors Step Procedure Points Gas pipe thermistors R1...

Page 216: ...Peel the putty and pull out the liquid pipe thermistors Be careful not to lose the fixtures for the thermistors 3 Pull out the heat exchanger thermistor Step Procedure Points Liquid pipe thermistors...

Page 217: ...Remove the clip from the heat exchanger thermistor Be careful not to lose the clip for the thermistor 5 Slightly open the sound blanket outer 6 Remove the sound blanket top upper Step Procedure Points...

Page 218: ...GVJU SiUS12 928 209 Removal Procedure 7 Remove the discharge pipe thermistor 8 Remove the fixture 3 Removal of the four way valve coil 1 Remove the screw Step Procedure Points R10420 Discharge pipe th...

Page 219: ...SiUS12 928 Outdoor Unit 3MXS24JVJU 4MXS32GVJU Removal Procedure 210 2 Remove the four way valve coil Step Procedure Points R10432 Four way valve coil...

Page 220: ...plies before disassembling work Step Procedure Points 1 Open the sound blanket outer 2 Remove the sound blanket top upper The sound blanket is fragile Carefully pass the discharge pipe through it 3 Re...

Page 221: ...top inner The sound blanket is fragile Carefully pass the discharge pipe through it 6 Open the sound blanket inner and pass it through the mufflers The sound blanket is fragile Be careful of the notc...

Page 222: ...Outdoor Unit 3MXS24JVJU 4MXS32GVJU SiUS12 928 213 Removal Procedure 7 Remove the sound blanket inner Step Procedure Points R10439...

Page 223: ...re after turning off all power supplies before disassembling work Step Procedure Points 1 Remove the terminal cover 2 Disconnect the compressor lead wires U red V yellow W blue 3 Remove the overload p...

Page 224: ...ttings 1 Trial Operation 217 2 Wiring Error Check Function 219 3 Field Settings 221 3 1 Priority Room Setting 221 3 2 COOL HEAT Mode Lock 221 3 3 NIGHT QUIET Mode 222 3 4 When 2 Units are Installed in...

Page 225: ...SiUS12 928_A Trial Operation and Field Settings 216...

Page 226: ...eration with the previous mode when the circuit breaker is restored In cooling mode select the lowest programmable temperature in heating mode select the highest programmable temperature Trial operati...

Page 227: ...utton and the MODE button at the same time 3 Press the MODE button twice is displayed on the display to indicate that trial operation is selected 4 Press the MODE button and select operation mode 5 Tr...

Page 228: ...rs blink all at the same time Transmission failure occurs at any of the indoor units The indoor unit heat exchanger thermistor is disconnected An indoor unit is in trouble if a trouble occurs during t...

Page 229: ...the forced operation is over LED1 Room A wiring LED2 Room B wiring 1st blinking LED Port A piping 2nd blinking LED Port B piping The 1st blinking LED means the room that is connected with Port A The...

Page 230: ...precedence Cancellation of control The control function is canceled when the POWERFUL operation mode is switched off or 20 minutes elapse after POWERFUL Operation started 3 2 COOL HEAT Mode Lock Use...

Page 231: ...ng noise of the outdoor unit at nighttime This function is useful if the customer is worried about the effects of the operating noise on the neighbors However if NIGHT QUIET mode is running cooling ca...

Page 232: ...System 1 Remove the front grille 2 Remove the electrical box 3 Remove the metal plate of the electrical box Address JA Address JA EXIST 1 CUT 2 R10274 1 2 3 ADDRESS JA CUT EXIST 1 2 ADDRESS JA JB JC...

Page 233: ...encouraging the heat radiation of the power transistor and the diode bridge Applying the paste should be implemented in accordance with the following instructions Note There is the possibility of fail...

Page 234: ...SiUS12 928_A 225 Appendix Part 9 Appendix 1 Piping Diagrams 2 1 1 Indoor Unit 2 1 2 Outdoor Unit 3 2 Wiring Diagrams 5 2 1 Indoor Unit 5 2 2 Outdoor Unit 7...

Page 235: ...SiUS12 928_A Appendix 226...

Page 236: ...D PIPING 3 8CuT 1 2CuT REFRIGERANT FLOW COOLING HEATING 4D048251C CuT FIELD PIPING FIELD PIPING 1 4CuT CROSS FLOW FAN FAN MOTOR 5 16CuT INDOOR UNIT 1 2CuT M HEAT EXCHANGER REFRIGERANT FLOW ON HEAT EXC...

Page 237: ...PIPING 3D048177A OUTDOOR UNIT MOTOR OPERATED LIQUID PIPE HEAT EXCHANGER VALVE A THERMISTOR OUTDOOR TEMPERATURE A ROOM A 5 16CuT EV THERMISTOR RECEIVER HEADER 5 16CuT ROOM A 5 16CuT HEADER MOTOR OPERA...

Page 238: ...E ACCUMULATOR ROOM D 5 16CuT 1 2CuT 5 16CuT MUFFLER HEAT EXCHANGER CONDENSER 5 16CuT ROOM C ROOM A 5 16CuT DISCHARGE PIPE PROPELLER FAN 5 8CuT 5 8CuT ROOM D MUFFLER HEAT EXCHANGER 5 8CuT 5 8CuT 5 16Cu...

Page 239: ...F FIELD WIRING CAUTION 3 2 1 OUTDOOR FRAME GROUND FUSE HARNESS PILOT LAMP FAN MOTOR PRINTED CIRCUIT BOARD CONNECTOR OPERATION SWITCH TERMINAL STRIP 3D038065L CONTROLLER WIRELESS REMOTE PCB4 PCB3 PCB5...

Page 240: ...F M 3 BLK Q1M 130 C 1 WHT YLW TRANSMISSION CIRCUIT C1 3 15A F1U Q1M M1F V1TR S1W X1M Z1C H1P H3P R1T R2T PCB1 PCB2 S1 S32 RTH1 GND H2 H3 H1 FAN MOTOR PRINTED CIRCUIT BOARD NOISE FILTER FERRITE CORE PH...

Page 241: ...D S2W S5W S1W S3W S4W Y1S Y1R Y1E Y2E 1 S10 7 1 S51 12 1 S101 5 MRB 1 MRD MRC W S80 9 1 S20 A 6 1 S21 B 6 H5P 1 H4PH3P S52 H2P H1P 12 1 S1025 S2 S15 1 5 FU2 3 15A L1 L2 V5 V R3TR2TR1T R8TR9T R4TR5T AS...

Page 242: ...12 WHT C 3 V 1 POWER SUPPLY 60Hz 208 230V 2 BLU X5M 1 X3M RED BLU YLW MRC M S40 W ROOM B D S93 A S10 X11A BLU 6 FU3 RED Y2E SW2 M1F V9 3 1 3 PCB1 BLU 30A WHT ORG L2 YLW YLW R11T ROOM A YLW 2 SA2 Y4E...

Page 243: ...SiUS12 928_A Wiring Diagrams Appendix 234...

Page 244: ...ct conforms tot he applicable standards and is suitable for use in the region where the product will be used This statement does not purport to exclude restrict or modify the application of any local...