Daikin FVXG25K2V1B Service Manual Download Page 114

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Troubleshooting

SiBE061121_A

104

Service Diagnosis

4.27 Output Overcurrent Detection

Error Code

Method of Error
Detection

An output overcurrent is detected by checking the current that flows in the inverter DC section.

Error Decision
Conditions

A position 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
microcomputer.

If the error repeats, the system is shut down.

Reset condition: Continuous run for about 11 minutes (25/35 class) or 5 minutes (50 class)
without any other error

Supposed
Causes

Poor installation condition

Closed stop valve

Defective power module

Wrong internal wiring

Abnormal power supply voltage

Defective outdoor unit PCB

Defective compressor

Summary of Contents for FVXG25K2V1B

Page 1: ...Service Manual Applied Models O Inverter Pair Heat Pump Inverter Pair Floor Standing Type K Series SiBE061121_A...

Page 2: ...K Series zHeat Pump Indoor Unit FVXG25K2V1B FVXG35K2V1B FVXG50K2V1B Outdoor Unit RXG25K2V1B RXG25K3V1B RXG35K2V1B RXG35K3V1B RXG50K2V1B RXG50K3V1B The removal procedure for each model is separately b...

Page 3: ...NT Operation 22 1 6 Program Dry Operation 24 1 7 Automatic Operation 25 1 8 Thermostat Control 26 1 9 NIGHT SET Mode 27 1 10 ECONO Operation 28 1 11 Inverter POWERFUL Operation 29 1 12 Clock Setting 3...

Page 4: ...ed Voltage between Indoor Unit and Outdoor Unit 79 4 12 Outdoor Unit PCB Abnormality 80 4 13 OL Activation Compressor Overload 82 4 14 Compressor Lock 84 4 15 DC Fan Lock 85 4 16 Input Overcurrent Det...

Page 5: ...oling Operation 120 3 Trial Operation 122 4 Field Settings 123 4 1 When 2 Units are Installed in 1 Room 123 4 2 Standby Electricity Saving 124 4 3 Facility Setting Jumper cooling at low outdoor temper...

Page 6: ...ower cable plug from the plug socket before disassembling the equipment for repair Working on the equipment that is connected to the power supply may cause an electrical shock If it is necessary to su...

Page 7: ...ctrical shock Do not clean the air conditioner by splashing water Washing the unit with water may cause an electrical shock Be sure to provide the grounding when repairing the equipment in a humid or...

Page 8: ...eat generation or fire When wiring between the indoor and outdoor units make sure that the terminal cover does not lift off or dismount because of the cable If the cover is not mounted properly the te...

Page 9: ...vent children from swallowing it If a child swallows the coin battery see a doctor immediately Warning Caution Installation of a leakage breaker is necessary in some cases depending on the conditions...

Page 10: ...e to install the packing and seal on the installation frame properly If the packing and seal are not installed properly water may enter the room and wet the furniture and floor For unitary type only C...

Page 11: ...SiBE061121_A List of Functions 1 Part 1 List of Functions 1 Functions 2...

Page 12: ...r power failure z z 3 D airflow Self diagnosis digital LED display z z Comfort Control Auto fan speed z z Wiring error check function Indoor unit quiet operation z z Anti corrosion treatment of outdoo...

Page 13: ...l LED display z z Comfort Control Auto fan speed z z Wiring error check function Indoor unit quiet operation z z Anti corrosion treatment of outdoor heat exchanger z z NIGHT QUIET mode automatic OUTDO...

Page 14: ...SiBE061121_A 4 Specifications Part 2 Specifications 1 Specifications 5...

Page 15: ...Mildew Proof Removable Washable Mildew Proof Running Current Rated A 0 10 0 09 0 09 0 11 0 11 0 10 0 11 0 10 0 10 0 12 0 12 0 11 Power Consumption Rated W 19 19 19 22 22 22 21 21 21 24 24 24 Power Fa...

Page 16: ...r Filter Removable Washable Mildew Proof Running Current A 0 17 0 16 0 15 0 18 0 17 0 17 Power Consumption W 32 32 32 35 35 35 Power Factor 85 6 87 0 88 9 88 4 89 5 85 8 Temperature Control Microcompu...

Page 17: ...Proof Removable Washable Mildew Proof Running Current Rated A 0 10 0 09 0 09 0 11 0 11 0 10 0 11 0 10 0 10 0 12 0 12 0 11 Power Consumption Rated W 19 19 19 22 22 22 21 21 21 24 24 24 Power Factor 86...

Page 18: ...r Filter Removable Washable Mildew Proof Running Current A 0 17 0 16 0 15 0 18 0 17 0 17 Power Consumption W 32 32 32 35 35 35 Power Factor 85 6 87 0 88 9 88 4 89 5 85 8 Temperature Control Microcompu...

Page 19: ...E061121_A Printed Circuit Board Connector Wiring Diagram 9 Part 3 Printed Circuit Board Connector Wiring Diagram 1 Indoor Unit 10 2 Outdoor Unit 12 2 1 25 35 Class 12 2 2 RXG50K2V1B 14 2 3 RXG50K3V1B...

Page 20: ...HA 5 S26 Connector for service PCB 6 S30 Connector for indoor electronic expansion valve coil motor operated valve coil 7 S32 Connector for indoor heat exchanger thermistor 8 S33 Connector for room t...

Page 21: ...hem off 1 S56 Connector for main PCB 2 S1W Forced cooling operation ON OFF button Refer to page 120 for detail 3 H1P LED for operation green 4 H2P LED for timer yellow 5 H3P LED for RADIANT operation...

Page 22: ...ad protector 4 S50 Connector for magnetic relay 5 S70 Connector for fan motor 6 S80 Connector for four way valve coil 7 S90 Connector for thermistors outdoor temperature outdoor heat exchanger dischar...

Page 23: ...terminal board 3 E1 E2 Terminal for earth wire 4 HL2 HN2 Connector for main PCB 5 HR1 Connector for reactor 6 FU1 Fuse 3 15 A 250 V 7 FU3 Fuse 20 A 250 V 8 V2 V3 Varistor HR1 HL2 3P254234 1 FU1 HN2 S...

Page 24: ...thermistors outdoor temperature outdoor heat exchanger discharge pipe 8 AC1 AC2 Connector for terminal board power supply 9 E1 E2 Connector for earth wire 10 HR1 HR2 Connector for reactor 11 U V W Co...

Page 25: ...il 4 S40 Connector for overload protector 5 S50 Connector for magnetic relay 6 S70 Connector for fan motor 7 S80 Connector for four way valve coil 8 S90 Connector for thermistors outdoor temperature o...

Page 26: ...erminal board 3 E1 E2 Terminal for earth wire 4 HL2 HN2 Connector for HL3 HN3 on main PCB 5 HL4 HN4 Connector for S12 on main PCB 6 FU1 Fuse 3 15 A 250 V 7 FU3 Fuse 30 A 250 V 8 V2 V3 Varistor 9 SW1 F...

Page 27: ...1 11 Inverter POWERFUL Operation 29 1 12 Clock Setting 30 1 13 WEEKLY TIMER Operation 31 1 14 Other Functions 37 2 Function of Thermistor 39 3 Control Specification 40 3 1 Mode Hierarchy 40 3 2 Frequ...

Page 28: ...the compressor is controlled by the following 2 parameters The load condition of the operating indoor unit The difference between the room thermistor temperature and the target temperature Additional...

Page 29: ...ooling Once 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 f...

Page 30: ...ngle Louvers The louvers made of elastic synthetic resin provide a wide range of airflow that guarantees a comfortable air distribution You can adjust the position of the louvers Auto Swing The swingi...

Page 31: ...an speed operation the step SL is not available The airflow rate is automatically controlled within this range when the FAN setting button is set to automatic Cooling The following drawing explains th...

Page 32: ...ning of the indoor electronic expansion valve to achieve the target panel temperature The panel temperature is categorized into stop dropping keep up and return zones The target panel temperature is 5...

Page 33: ...Set temperature Rotation speed of indoor unit fan Note The only difference between RADIANT 1 and RADIANT 2 is the movement of the indoor unit fan In RADIANT 1 the rotation speed of the indoor unit fa...

Page 34: ...emperature at start up and the target temperature is divided into two zones Then the unit operates in an appropriate capacity for each zone to maintain the temperature and humidity at a comfortable le...

Page 35: ...set temperature Ts determines the target temperature Tt Ts 18 30 C 2 The target temperature Tt is calculated as Tt Ts C where C is the correction value C 0 C 3 Thermostat ON OFF point and operation mo...

Page 36: ...g in the zone A The system resumes from defrost control in any zones except A The operation turns on in any zones except A The monitoring time has passed while the temperature difference is in the zon...

Page 37: ...utomatically raises the target temperature slightly in the case of cooling or lowers it slightly in the case of heating This prevents excessive cooling in summer and excessive heating in winter to ens...

Page 38: ...controller by pushing the ECONO button Detail When this function is activated the maximum capacity also decreases ECONO operation can start only when the unit is running Pressing the ON OFF button on...

Page 39: ...s only available in RADIANT 1 RADIANT operation with heating it is not available in RADIANT 2 RADIANT operation only Operation mode Fan speed Target temperature COOL H tap A rpm 18 C DRY Dry rotating...

Page 40: ...or button to set the clock to the current day of the week 3 Press the CLOCK button blinks 4 Press the SELECT or button to set the clock to the present time Holding down the SELECT or button increases...

Page 41: ...ile different timer settings are made for the weekend Tuesday to Friday Program 1 ON Program 2 OFF Program 3 ON Program 4 OFF Program 1 ON Program 1 ON Program 2 OFF Program 2 OFF Program 3 ON Program...

Page 42: ...FF Program 3 ON Program 4 OFF The day of the week and the reservation number of the current day will be displayed 1 to 4 settings can be made per day 2 Press to select the desired day of the week and...

Page 43: ...ervation screen will appear To continue further settings repeat the procedure from step 4 The multi monitor lamp blinks twice The TIMER lamp periodically lights orange The multi monitor lamp will not...

Page 44: ...Tuesday to Friday 2 Press to confirm the day of the week to be copied Be sure to direct the remote controller toward the indoor unit and check for a receiving tone and flashing the multi monitor lamp...

Page 45: ...ation details To change the confirmed reserved settings select the reservation number and press The mode is switched to setting mode Go to setting mode step 2 To deactivate WEEKLY TIMER operation Pres...

Page 46: ...be deleted All reservations Hold for 5 seconds while normal display 2 Press to select the day of the week and the reservation number to be deleted Pressing changes ON OFF TIMER mode Pressing alternate...

Page 47: ...e refers to the following table Forced cooling operation Forced cooling operation can be started by pressing the ON OFF button for 5 to 9 seconds while the unit is not operating Refer to page 120 for...

Page 48: ...e Indoor Unit Display Each time you press the Brightness button on the remote controller the brightness of the indoor unit display changes to high low or off Refer to the operation manual for details...

Page 49: ...trolling the target discharge pipe temperature The system sets the target discharge pipe temperature according to the outdoor and indoor heat exchanger temperature and controls the outdoor electronic...

Page 50: ...etail Note Unless specified otherwise a dry operation command is regarded as cooling operation and a radiant operation command is regarded as heating operation Air conditioner control mode Forced oper...

Page 51: ...upper limit frequency among the frequency upper limits of the following functions Compressor protection input current discharge pipe temperature heating peak cut freeze up protection defrost 3 Determ...

Page 52: ...ency does not change for more than a certain fixed time the frequency is adjusted according to the D value When the D value is low the frequency is lowered When the D value is high the frequency is in...

Page 53: ...to OFF when the heating is stopped the OFF delay switch of the four way valve is carried out Detail OFF delay switch of four way valve The four way valve coil is energized for 150 160 seconds after th...

Page 54: ...rtain level the upper limit of frequency is set to keep the discharge pipe temperature from rising further Detail 25 35 class 50 class A Hz 48 55 B Hz 64 70 C Hz 88 85 D seconds 240 120 E seconds 360...

Page 55: ...limit of the compressor frequency is defined as operation frequency 2 Hz After this the output frequency is lowered by 2 Hz every second until it reaches the keep zone Keep zone The present maximum fr...

Page 56: ...determines the frequency upper limit to prevent abnormal high pressure Detail A C B C C C 9 7 5 R14718 Reset zone Indoor heat exchanger thermistor temperature Up zone Keep zone Dropping zone Stop zon...

Page 57: ...l operation 5 Fan speed control during forced cooling operation The outdoor fan is controlled as well as normal operation during forced cooling operation 6 Fan speed control during POWERFUL operation...

Page 58: ...6 minutes More than A minutes of accumulated time pass after the start of the operation or ending the previous defrosting Conditions for Canceling Defrost The judgment is made with the outdoor heat ex...

Page 59: ...ntrol which function in each operation mode Cooling h h h h h h h h h h h h h h h h h Heating h h h h h h h h h h h h h h h h h h h Holding Functions No Functions Starting control Control when the fre...

Page 60: ...ng defrosting 3 11 4 Starting Operation Control The outdoor electronic expansion valve opening is controlled when the operation starts and prevents the superheating or liquid compression 3 11 5 Contro...

Page 61: ...ration mode is heating When the following condition is fulfilled the discharge pipe thermistor disconnection is ascertained Discharge pipe temperature 6 C indoor heat exchanger temperature Adjustment...

Page 62: ...tion If the power consumption is below the specified value and the frequency is higher than the specified frequency it is regarded as refrigerant shortage The power consumption is low comparing with t...

Page 63: ...SiBE061121_A Remote Controller 53 Part 5 Remote Controller 1 FVXG25 35 50K2V1B 54...

Page 64: ...ation Press once again to stop it TEMPERATURE adjustment buttons AUTO DRY COOL HEAT FAN 18 30 C Not available 18 32 C 10 30 C Not available Displays the current settings In this illustration each sect...

Page 65: ...WERFUL operation cannot be used at the same time Priority is given to the function you pressed last Powerful operation Press this button and adjust the day and time with the SELECT button Press this b...

Page 66: ...e between Indoor Unit and Outdoor Unit 79 4 12 Outdoor Unit PCB Abnormality 80 4 13 OL Activation Compressor Overload 82 4 14 Compressor Lock 84 4 15 DC Fan Lock 85 4 16 Input Overcurrent Detection 86...

Page 67: ...ice Diagnosis 57 5 9 Installation Condition Check 113 5 10 Discharge Pressure Check 113 5 11 Outdoor Fan System Check 114 5 12 Main Circuit Short Check 114 5 13 Capacitor Voltage Check 115 5 14 Power...

Page 68: ...the thermistor malfunctions 2 When a signal transmission error occurs between the indoor and outdoor units In either case conduct the diagnostic procedure described in the following pages Service Moni...

Page 69: ...the outdoor temperature Heating operation cannot be used when the outdoor temperature is 18 CWB or higher and cooling operation cannot be used when the outdoor temperature is below 10 CDB depending on...

Page 70: ...responding codes 2 To return to the normal mode hold the timer cancel button down for 5 seconds When the remote controller is left untouched for 60 seconds it also returns to the normal mode 3 Not all...

Page 71: ...tton at the same time 5C is displayed on the LCD 2 Select 5C service check with the Temp or button 3 Press the Mode button to enter the service check mode The left side number blinks 4 Press the Temp...

Page 72: ...e Temp or button and change the number until you hear the long beep 8 Diagnose by the sound beep The left side number does not correspond with the error code two consecutive beeps The left side number...

Page 73: ...perature thermistor or related abnormality 70 CE Radiant panel thermistor or related abnormality 70 Outdoor Unit E1 Outdoor unit PCB abnormality 80 E5 OL activation compressor overload 82 E6 Compresso...

Page 74: ...heck the connection of connectors See Note Correct the connection OK Check the power supply voltage Start operation Voltage as rated Error repeats Check the power supply voltage Start operation Voltag...

Page 75: ...Heating peak cut control During heating operation the indoor heat exchanger temperature is above 65 C Supposed Causes Short circuited air Clogged air filter of the indoor unit Dust accumulation on th...

Page 76: ...to determine abnormal fan motor operation Error 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 fan mot...

Page 77: ...fan rotate smoothly Does the fan rotate 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...

Page 78: ...panel temperature does not rise Operation stops when any of these cases is detected by the system Freeze up protection control The temperature detected by the radiant panel thermistors is used to prev...

Page 79: ...ristic chart Is there any short circuit YES Clean the indoor heat exchanger Very dirty YES Clean the air filter Very dirty NO Completed Error repeats Be sure to turn off the power switch before connec...

Page 80: ...upposed Causes Disconnection of connector Defective thermistor Defective indoor unit PCB Troubleshooting Check No 01 Refer to P 106 C4 Indoor heat exchanger thermistor C9 Room temperature thermistor C...

Page 81: ...n III Refrigerant shortage is detected by checking the difference between suction and discharge temperature Error Decision Conditions Refrigerant shortage detection I The following conditions continue...

Page 82: ...he discharge pipe thermistor indoor or outdoor heat exchanger thermistor room or outdoor temperature thermistor Closed stop valve Refrigerant shortage refrigerant leakage Poor compression performance...

Page 83: ...the pipe flare or replace the union Check the power transistor harness for loosening Correct it as required Also replace the cracked pipe Check the pipes for improper contact and correct them as requi...

Page 84: ...Unit Low voltage detection The voltage detected by the DC voltage detection circuit is below 150 180 V depending on the model The compressor stops if the error occurs and restarts automatically after...

Page 85: ...Reconnect the harness Check the power supply voltage Check the connection of the compressor harness Disturbance factors Noise Power supply distortion Repeat a few times Precaution before turning on th...

Page 86: ...cked whether it is normal Error Decision Conditions The data sent from the outdoor unit cannot be received normally or the content of the data is abnormal Supposed Causes Reduction of power supply vol...

Page 87: ...n wires between the indoor unit and outdoor unit Is LED A blinking Properly insulated Is there any disturbance Is there any wiring error Check the indoor unit outdoor unit connection wires Check the L...

Page 88: ...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 PCB Troubleshooting R7185...

Page 89: ...ecting 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 numbers 2P01234 f...

Page 90: ...ll of voltage Momentary power failure Troubleshooting 25 35 class RXG50K3V1B Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged NO YES Y...

Page 91: ...power switch before connecting or disconnecting connectors or parts may be damaged YES NO NO YES Turn on the power again Check to see if the unit is grounded Replace the outdoor unit PCB Ground the s...

Page 92: ...eset condition Continuous run for about 60 minutes without any other error Supposed Causes Disconnection of discharge pipe thermistor Defective discharge pipe thermistor Disconnection of connector S40...

Page 93: ...ce the four way valve or the coil Replace the outdoor unit PCB Discharge pipe thermistor disconnected Check No 01 Check the thermistors Check No 13 Check the four way valve Check No 14 Check the refri...

Page 94: ...rror Supposed Causes Compressor locked Compressor harness disconnected Troubleshooting Check No 15 Refer to P 110 Turn off the power Disconnect the harnesses U V and W R18317 Caution NO YES YES NO NO...

Page 95: ...Disconnection of the fan motor Foreign matter stuck in the fan Defective fan motor Defective outdoor unit PCB Troubleshooting Check No 16 Refer to P 112 R15675 Caution YES YES NO YES NO NO YES NO Turn...

Page 96: ...k No 18 Refer to P 113 Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged An input overcurrent may result from wrong internal wiring If...

Page 97: ...minutes depending on the model after operating for 5 10 minutes depending on the model Cooling Dry room thermistor temp indoor heat exchanger temp 5 C Heating indoor heat exchanger temp room thermisto...

Page 98: ...logged Reconnect the thermistor s Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged R15824 Refrigerant shortage Water mixed Stop valve...

Page 99: ...ortage Defective four way valve Water mixed in refrigerant Defective stop valve Defective outdoor unit PCB Troubleshooting Check No 01 Refer to P 106 Check No 12 Refer to P 108 Check No 14 Refer to P...

Page 100: ...or Defective outdoor unit PCB Troubleshooting Check No 01 Refer to P 106 Check No 12 Refer to P 108 Check No 17 Refer to P 113 Check No 18 Refer to P 113 Check No 19 Refer to P 114 R18182 Caution Repl...

Page 101: ...converted to voltage value The DC voltage before compressor start up is below 50 V Supposed Causes Broken or disconnected harness Defective outdoor unit PCB Troubleshooting Caution Be sure to turn of...

Page 102: ...S Connect the compressor properly NO YES Replace the reactor NO YES Replace the compressor or the compressor relay harness Restart the operation again and if the error occurs again replace the outdoor...

Page 103: ...h the position detection circuit Error Decision Conditions If the error repeats the system is shut down Reset condition Continuous run for about 11 minutes 25 35 class or 5 minutes 50 class without an...

Page 104: ...ES YES Check No 20 Check the short circuit of the diode bridge Check No 15 Check with the inverter analyzer Turn off the power Disconnect the harnesses U V and W Turn on the power Check the electrolyt...

Page 105: ...d R18334 NO NO YES NO YES YES Turn off the power Disconnect the harnesses U V and W Turn on the power Check the electrolytic capacitor voltage Electrical components or compressor harnesses connected a...

Page 106: ...ed on the compressor running frequency and the input current Error Decision Conditions If the error repeats the system is shut down Reset condition Continuous run for about 60 minutes without any othe...

Page 107: ...equency and CT detected input current Error Decision Conditions The compressor running frequency is more than A Hz and the CT input current is less than B A If the error repeats the system is shut dow...

Page 108: ...restart operation Check No 15 Check with the inverter analyzer Inverter analyzer RSUK0917C Voltage within the allowable range Power supply voltage 15 Replace the outdoor unit PCB Replace the outdoor...

Page 109: ...on J3 error is judged if the discharge pipe temperature is lower than the heat exchanger temperature Supposed Causes Disconnection of the connector for the thermistor Defective thermistor correspondin...

Page 110: ...rmistor s of the following thermistors Outdoor temperature thermistor Discharge pipe thermistor Outdoor heat exchanger thermistor Cooling Outdoor heat exchanger temperature Heating Indoor heat exchang...

Page 111: ...e outdoor unit PCB Troubleshooting Check No 17 Refer to P 113 Check No 19 Refer to P 114 A C B C C C 25 35 class 98 75 83 RXG50K2V1B 95 80 85 RXG50K3V1B 122 64 113 Caution WARNING To cool the electric...

Page 112: ...on is above A C The error is cleared when the radiation fin temperature drops below B C If the error repeats the system is shut down Reset condition Continuous run for about 60 minutes without any ot...

Page 113: ...ck the installation condition NO YES YES Above A C Radiation fin dirty Check No 19 Check the outdoor fan or related Error displayed again Has the PCB been replaced Check if silicon grease is applied p...

Page 114: ...unning A speed error occurs while the compressor is running An output overcurrent signal is fed from the output overcurrent detection circuit to the microcomputer If the error repeats the system is sh...

Page 115: ...f the power and reconnect the harnesses Turn on the power again and start operation Turn off the power and turn it on again to start the system See if the same error occurs Check the power supply volt...

Page 116: ...tester The relationship between normal temperature and resistance is shown in the table and the graph below The data is for reference purpose only Thermistor temperature C Resistance k 20 197 8 15 148...

Page 117: ...1 5 3 Power Supply Waveforms Check Check No 11 Measure the power supply waveform between No 1 and No 2 on the terminal board and check the waveform disturbance Check to see if the power supply wavefo...

Page 118: ...d 3 If the EV does not generate a latching sound in the above step 2 disconnect the connector and check the continuity using a tester 4 Check the continuity between the pins 1 6 2 6 3 6 and 4 6 If the...

Page 119: ...il Cooling Dry No continuity Heating Continuity Replace the outdoor unit PCB Replace the four way valve coil Replace the four way valve Four way valve coil resistance at 1000 2000 S80 voltage at 220 2...

Page 120: ...he charged voltage of the built in smoothing electrolytic capacitor drops to 10 VDC or below before carrying out the service work Reference If the terminals of the compressor are not FASTON terminals...

Page 121: ...CB If OK in Check No 22 check if there is any solder cracking on the PCB 4 If any solder cracking is found replace the PCB or repair the soldered section If there is no solder cracking replace the PCB...

Page 122: ...Check that the rotation command voltage between the pins 2 4 is 0 15 VDC 5 Keep operation off and power off Connect the connector S70 6 Check whether 2 pulses 0 15 VDC are output at the pins 1 4 when...

Page 123: ...ty Change the installation location or direction Change the installation location or direction Clean the outdoor heat exchanger Change the installation location or direction Check the outdoor temperat...

Page 124: ...ow If the resistance is or less than 1 k short circuit occurs on the main circuit 25 35 class R15001 YES YES NO NO Outdoor fan system is functioning Check the outdoor fan system Go to Check No 16 Outd...

Page 125: ...21 RXG50K2V1B only Before this check be sure to check the main circuit for short circuit With the circuit breaker still on measure the voltage according to the drawing of the model in question Be care...

Page 126: ...nector Follow the procedure below to measure resistance between the terminals of the power module and the terminals of the compressor with a multi tester Evaluate the measurement results referring to...

Page 127: ...SiBE061121_A Check Service Diagnosis 117 RXG50K2V1B RXG50K3V1B R16073 Power module Power module R16692...

Page 128: ...119 2 Forced Cooling Operation 120 3 Trial Operation 122 4 Field Settings 123 4 1 When 2 Units are Installed in 1 Room 123 4 2 Standby Electricity Saving 124 4 3 Facility Setting Jumper cooling at lo...

Page 129: ...Detail 1 Remove the valve caps from the liquid stop valve and the gas stop valve 2 Carry out forced cooling operation 3 After 5 to 10 minutes close the liquid stop valve with a hexagonal wrench 4 Aft...

Page 130: ...it for 5 seconds 2 Press the forced cooling operation ON OFF switch SW1 on the outdoor unit 25 35 class with standby electricity saving function turned off Command frequency 25 35 class 58 Hz 50 class...

Page 131: ...2V1B Outdoor Unit RXG50K3V1B Caution When pressing the switch do not touch the terminal board It has a high voltage and may cause electric shock LED A SW4 ON A B CD S102 SW1 S2 R14963 Forced cooling o...

Page 132: ...rts operation with the previous operation mode when the circuit breaker is restored In cooling operation select the lowest programmable temperature 18 C in heating operation select the highest program...

Page 133: ...Both the indoor unit PCB and the wireless remote controller need alteration Indoor Unit PCB 1 Remove the front panel air filters and front grille 2 Remove the screw and remove the service cover 3 Tur...

Page 134: ...rocedure is required for turning ON the function 1 Check that the main power supply is turned OFF Turn OFF if it has not been turned OFF 2 Remove the stop valve cover 3 Disconnect the selective connec...

Page 135: ...starts again Caution 1 If the outdoor unit is installed where the outdoor heat exchanger of the unit is exposed to direct wind provide a windbreak wall 2 Intermittent noises may be produced by the in...

Page 136: ...connected factory set When cut Fan speed setting when compressor stops for thermostat OFF effective only in cooling operation JB Fan speed setting Remote controller setting Fan speed setting 0 The fan...

Page 137: ...bridge Detail 1 Wipe off the old silicon grease completely 2 Apply the silicon grease evenly See the illustrations below for examples of application 3 Tighten the screws of the power transistor diode...

Page 138: ...iBE061121_A 128 Appendix Part 8 Appendix 1 Piping Diagrams 129 1 1 Indoor Unit 129 1 2 Outdoor Unit 130 2 Wiring Diagrams 132 2 1 Indoor Unit 132 2 2 Outdoor Unit 133 3 Removal Procedure Booklet No 13...

Page 139: ...CuT 6 4CuT CROSS FLOW FAN FIELD PIPING M 6 4CuT FAN MOTOR FIELD PIPING 9 5CuT 9 5CuT REFRIGERANT FLOW COOLING HEATING THERMISTOR ON HEAT EXCH 4D071597 INDOOR UNIT MV RADIANT PANEL THERMISTOR 6 4CuT TH...

Page 140: ...VE MUFFLER WITH FILTER MUFFLER WITH FILTER FOUR WAY VALVE ON HEATING 3D059586Q OUTDOOR UNIT HEAT EXCHANGER 7 9CuT 7 9CuT 7 9CuT 7 9CuT 7 9CuT 12 7CuT 7 9CuT 7 9CuT REFRIGERANT FLOW 6 4CuT COOLING 7 9C...

Page 141: ...COOLING 7 9CuT 4 0CuT HEATING 6 4CuT 4 0CuT 6 4CuT M PROPELLER FAN EV FILTER 12 7CuT 6 4CuT 9 5CuT 12 7CuT RECEIVER 7 9CuT 12 7CuT MUFFLER MUFFLER 6 4CuT 7 9CuT 9 5CuT MUFFLER 7 9CuT 12 7CuT COMPRESSO...

Page 142: ...T M YLW 1 M1S S34 S33 BLK 1 1 3 4 BLU 5 5 Z1C BLK R1T BRN YLW indoor R3T R4T SIGNAL RECEIVER 1 RED 1 BLU TRANSMISSION CIRCUIT WIRELESS REMOTE CONTROLLER FIELD WIRING CAUTION NOTE THAT OPERATION WILL R...

Page 143: ...UIT BOARD CONNECTOR THERMISTOR SURGE ARRESTER SW1 V1 V2 V3 X1M Y1E Y1R Z1C Z2C Z3C FORCED OPERATION SWITCH VARISTOR TERMINAL STRIP ELECTRONIC EXPANSION VALVE COIL REVERSING SOLENOID VALVE COIL FERRITE...

Page 144: ...03 L804 M1C M1F MRCW MRM10 MRM20 MR30 MR30_A MR30_B N Q1L Q1DI PCB1 PCB2 S10 S11 S12 S20 S40 S50 S70 S80 S90 HL3 HN3 X11A X12A R1T R2T R3T SA1 EARTH LEAK DETECTOR PRINTED CIRCUIT BOARD CONNECTOR THERM...

Page 145: ...x 135 3 Removal Procedure Booklet No Refer to the following booklets for removal procedure FVXG25 35 50K2V1B Refer to Si061263 RXG25 35K2V1B Refer to Si001156 RXG25 35K3V1B Refer to Si001273 RXG50K2V1...

Page 146: ...Revision History Month Year Version Revised contents 07 2011 SiBE061121 First edition 12 2012 SiBE061121_A Model addition RXG25 35 50K3V1B...

Page 147: ...s supplied or specified by Daikin Ask a qualified installer or contractor to install those parts and accessories Use of unauthorised parts and accessories or improper installation of parts and accesso...

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