Daikin FTXN25KEV1B Service Manual Download Page 96

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Troubleshooting

SiBE041102_A

Service Diagnosis

Troubleshooting

Correct the power supply.

Replace the outdoor
unit PCB.

Check for such factors for a
long term.

∗

Try to restart a few times.

(R15291)

Caution

Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.

YES

Reconnect it.

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 the power again)

Make sure the power has been off for at
least 30 seconds.

Replace the indoor
unit PCB.

Turn on the

power again. System

restarted?

Error

again

within

3 minutes

after turning on the

power?

Loose or

disconnected?

Voltage as rated?

YES

Summary of Contents for FTXN25KEV1B

Page 1: ...Service Manual Inverter Pair Wall Mounted Type K Series SiBE041102_A Applied Models O Inverter Pair Heat Pump...

Page 2: ...SiBE041102_A i Table of Contents Inverter Pair Wall Mounted Type K Series zHeat Pump Indoor Unit FTXN25KEV1B FTXN35KEV1B Outdoor Unit RXN25KEV1B RXN35KEV1B...

Page 3: ...8 NIGHT SET Mode 17 1 9 ECONO Operation 18 1 10 Inverter POWERFUL Operation 19 1 11 Other Functions 20 2 Function of Thermistor 21 3 Control Specification 22 3 1 Mode Hierarchy 22 3 2 Frequency Contro...

Page 4: ...load 64 4 10 Compressor Lock 65 4 11 Input Overcurrent Detection 66 4 12 Four Way Valve Abnormality 67 4 13 Discharge Pipe Temperature Control 69 4 14 High Pressure Control in Cooling 70 4 15 Compress...

Page 5: ...Removal of Outer Panels 118 2 2 Removal of Outdoor Fan Fan Motor 120 2 3 Removal of Electrical Box PCB 122 2 4 Removal of Sound Blankets 130 2 5 Removal of Four Way Valve 132 2 6 Removal of Compresso...

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: ...cover does not lift off or dismount because of the cable If the cover is not mounted properly the terminal connection section may cause an electrical shock excessive heat generation or fire Do not da...

Page 9: ...not install the equipment in a place where there is a possibility of combustible gas leaks If the combustible gas leaks and remains around the unit it may cause a fire Check to see if the parts and w...

Page 10: ...furniture and floor For unitary type only Caution Icon Type of Information Description Note Note A note provides information that is not indispensable but may nevertheless be valuable to the reader su...

Page 11: ...SiBE041102_A List of Functions 1 Part 1 List of Functions 1 Functions 2...

Page 12: ...fter Power Failure z Horizontal Auto Swing Right and Left Self Diagnosis Digital LED Display z 3 D Airflow Wiring Error Check Function COMFORT AIRFLOW Operation z Anti Corrosion Treatment of Outdoor H...

Page 13: ...SiBE041102_A Specifications 3 Part 2 Specifications 1 Specifications 4...

Page 14: ...Horizontal Downward Right Left Horizontal Downward Air Filter Removable Washable Mildew Proof Removable Washable Mildew Proof Running Current Rated A 0 15 0 15 0 16 0 15 0 15 0 16 0 15 0 15 0 16 0 15...

Page 15: ...SiBE041102_A Printed Circuit Board Connector Wiring Diagram 5 Part 3 Printed Circuit Board Connector Wiring Diagram 1 Indoor Unit 6 2 Outdoor Unit 8...

Page 16: ...Connector for indoor heat exchanger thermistor 6 H1 H2 H3 FG Connector for terminal board 7 V1 Varistor 8 JA Address setting jumper JB Fan speed setting when compressor stops for thermostat OFF JC Pow...

Page 17: ...Printed Circuit Board Connector Wiring Diagram 7 PCB Detail PCB 1 Control PCB PCB 2 Display PCB LED_A JB JC JA LED_A JB JC JA F1U H1 H2 H3 FG S1 V1 S7 S32 S21 S26 S6 2P270085 1 S27 SW1 Solder side LE...

Page 18: ...ctor for thermistors outdoor temperature outdoor heat exchanger discharge pipe 6 HL1 HN1 S Connector for terminal board 7 E1 E2 Terminal for earth 8 HR1 HR2 Connector for reactor 9 U V W Connector for...

Page 19: ...CONO Operation 18 1 10 Inverter POWERFUL Operation 19 1 11 Other Functions 20 2 Function of Thermistor 21 3 Control Specification 22 3 1 Mode Hierarchy 22 3 2 Frequency Control 23 3 3 Controls at Mode...

Page 20: ...et 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 temperature and the target temperature...

Page 21: ...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 22: ...Heating Mode During heating mode the large flap directs airflow downwards to spread the warm air to the entire room Wide Angle Louvers The louvers made of elastic synthetic resin provide a wide range...

Page 23: ...en the FAN setting button is set to automatic Cooling The following drawing explains the principle of fan speed control for cooling In automatic fan speed operation upper limit is at M tap in 30 minut...

Page 24: ...mperature at start up and the target temperature is divided into two zones Then the unit operates in the dry mode with an appropriate capacity for each zone to maintain the temperature and humidity at...

Page 25: ...ction value 1 The 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 poin...

Page 26: ...ng 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 zo...

Page 27: ...then automatically 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...

Page 28: ...m the wireless remote controller by pushing the ECONO button When this function is activated the maximum capacity also decreases The remote controller can send the ECONO command when the unit is in CO...

Page 29: ...inutes Ex POWERFUL operation in cooling mode Operation mode Fan speed Target temperature COOL H tap 50 rpm 18 C DRY Dry rotating speed 50 rpm Lowered by 2 5 C HEAT H tap 50 rpm 31 C FAN H tap 50 rpm A...

Page 30: ...ode 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 138 fo...

Page 31: ...ture used in place of the inner temperature of the compressor rises abnormally the operating frequency becomes lower or the operation halts 2 The discharge pipe thermistor is used for detecting discon...

Page 32: ...n mode for installation and servicing Detail Note Unless specified otherwise an indoor dry operation command is regarded as cooling operation Air conditioner control mode Forced operation mode Forced...

Page 33: ...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 Determi...

Page 34: ...quency 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...

Page 35: ...FF delay switch of the four way valve is carried out after the operation stopped Detail OFF delay switch of four way valve The four way valve coil is energized for 160 seconds after the operation is s...

Page 36: ...the upper limit of frequency is set to keep this temperature from rising further Detail A Hz 58 B Hz 72 C Hz 90 D seconds 180 E seconds 180 F seconds 10 sec Time R13528 Hz Frequency C B D E F A Zone...

Page 37: ...e upper limit of the compressor frequency is defined as operation frequency 2 Hz After this the output frequency is pulled down by 2 Hz every second until it reaches the keep zone Keep zone The presen...

Page 38: ...heat exchanger temperature determines the frequency upper limit to prevent abnormal high pressure Detail R14841 Reset zone Indoor heat exchanger thermistor temperature Up zone Keep zone Dropping zone...

Page 39: ...difference is low the outdoor fan stops When the pressure difference is high the outdoor fan rotates 5 Fan control while forced cooling operation The outdoor fan is controlled as well as normal operat...

Page 40: ...ation The compressor operates for 6 minutes More than 28 minutes of accumulated time have passed since the start of the operation or ending the previous defrosting Conditions for Canceling Defrost The...

Page 41: ...control h Holding Functions No Functions Under defrost control Cooling Starting control h Control when the frequency changes h h Target discharge pipe temperature control h h h High discharge pipe tem...

Page 42: ...egree during defrosting 3 11 4 Starting Operation Control The electronic expansion valve opening is controlled when the operation starts and prevents the superheating or liquid compression 3 11 5 Cont...

Page 43: ...xchanger temperature 2 When the operation mode is heating When the following condition is fulfilled the discharge pipe thermistor disconnection is ascertained Discharge pipe temperature 6 C indoor hea...

Page 44: ...current decreases when the outdoor temperature exceeds a certain level 3 12 3 Refrigerant Shortage Control Outline I Detecting by power consumption If the power consumption is below the specified val...

Page 45: ...uration 36 2 Operation Manual 37 2 1 Remote Controller 37 2 2 AUTO DRY COOL HEAT FAN Operation 38 2 3 Adjusting the Airflow Direction 40 2 4 COMFORT AIRFLOW Operation 42 2 5 POWERFUL Operation 43 2 6...

Page 46: ...ll and how to use it efficiently Providing instructions to the user can reduce requests for servicing by 80 However proficient the installation and operating functions of the air conditioning system a...

Page 47: ...O operation page 15 4 POWERFUL button POWERFUL operation page 14 5 TEMPERATURE adjustment button It changes the temperature setting 6 ON OFF button Press this button once to start operation Press once...

Page 48: ...operation To change the temperature setting 1 Press and select a operation mode Each pressing of the button advances the mode setting in sequence AUTO DRY COOL HEAT FAN 2 Press 4 Press is displayed o...

Page 49: ...ing capacity In that case the system switches into defrosting operation to take away the frost During defrosting operation hot air does not flow out of indoor unit A pinging sound may be heard during...

Page 50: ...o increase your comfort To start auto swing To set the flap at desired position This function is effective while flap is in auto swing mode Press when the flap has reached the desired position The fla...

Page 51: ...d causing the cooling or heating efficiency to drop Always use a remote controller to adjust the angles of the flap If you attempt to move the flap and louvers forcibly with hand when they are swingin...

Page 52: ...of the room is displayed on the LCD Airflow rate is set to Auto COOL DRY The flap will go up HEAT The flap will go down 2 Press again The flap will return to the memory position from before COMFORT AI...

Page 53: ...peration cannot be used together with ECONO or COMFORT AIRFLOW operation Priority is given to the function of whichever button is pressed last POWERFUL operation can only be set when the unit is runni...

Page 54: ...operation Normal operation ECONO operation Maximum during ECONO operation Time This diagram is a representation for illustrative purposes only The maximum running current and power consumption of the...

Page 55: ...he LCD Each pressing of advances the time setting by 1 hour The time can be set between 1 to 9 hours The TIMER lamp lights up 2 Press disappears from the LCD The TIMER lamp goes off Notes on TIMER ope...

Page 56: ...Each pressing of advances the time setting by 1 hour The time can be set between 1 to 12 hours The TIMER lamp lights up 2 Press disappears from the LCD The TIMER lamp goes off A sample setting for com...

Page 57: ...12 Four Way Valve Abnormality 67 4 13 Discharge Pipe Temperature Control 69 4 14 High Pressure Control in Cooling 70 4 15 Compressor System Sensor Abnormality 71 4 16 Position Sensor Abnormality 72 4...

Page 58: ...mistor 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 Monitor The...

Page 59: ...F Check the outdoor temperature Heating operation cannot be used when the outdoor temperature is 24 C or higher and cooling operation cannot be used when the outdoor temperature is below 10 C Diagnose...

Page 60: ...ate non corresponding 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 mod...

Page 61: ...he long beep 3 Diagnose by the sound beep The left side number does not correspond with the error code two consecutive beeps The left side number corresponds with the error code but the right side num...

Page 62: ...beep Both the left side and right side numbers correspond with the error code 7 Determine the error code The numbers indicated when you hear the long beep are the error code Error codes and descriptio...

Page 63: ...r related abnormality 59 C9 Room temperature thermistor or related abnormality 59 Outdoor Unit E1 Outdoor unit PCB abnormality 63 E5 OL activation compressor overload 64 E6 Compressor lock 65 E8 Input...

Page 64: ...ion of connector Troubleshooting 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...

Page 65: ...ing heating operation 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 Free...

Page 66: ...an the air filter Clean the indoor heat exchanger Replace the indoor unit PCB Replace the thermistor Does it conform to the thermistor characteristic chart Check the air filter Check the dust accumula...

Page 67: ...mine 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 fan motor...

Page 68: ...re an output Is it the rated voltage Does the fan rotate smoothly Is it the rated voltage Is there continuity Start operation Turn off the power supply and rotate the fan by hand Check the fan motor v...

Page 69: ...mpressor operation Supposed Causes Disconnection of connector Defective thermistor Defective indoor unit PCB Troubleshooting Check No 01 Refer to P 87 C4 Indoor heat exchanger thermistor C9 Room tempe...

Page 70: ...it 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 data is abnorm...

Page 71: ...wires Diagnose the outdoor unit PCB Replace the connection wires between the indoor unit and outdoor unit Is LED A blinking Properly insulated Is there any disturbance Is there any wiring error Check...

Page 72: ...ong wiring 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...

Page 73: ...Momentary fall of voltage Momentary power failure Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged NO YES YES R14577...

Page 74: ...ive stop valve Troubleshooting Check No 01 Refer to P 87 Check No 12 Refer to P 89 Check No 13 Refer to P 90 Check No 14 Refer to P 90 R14438 Caution YES NG Discharge pipe thermistor NO OK OK NG Refri...

Page 75: ...power Disconnect the harnesses U V and W R14439 Caution NO YES YES NO NO YES Check No 15 Check with the inverter checker Turn off the power and reconnect the harnesses Turn on the power again and res...

Page 76: ...0 NO YES YES NO Start operation and measure the input current Check No 18 Check the discharge pressure Check No 17 Check the installation condition Check No 15 Check with the inverter checker Turn off...

Page 77: ...Malfunction Decision Conditions A following condition continues over 10 minutes after operating for 5 minutes Cooling Dry room thermistor temp indoor heat exchanger temp 5 C Heating indoor heat excha...

Page 78: ...way valve defective or dust clogged Reconnect in position Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged R14441 Four way valve coil...

Page 79: ...rtage Defective four way valve Water mixed in refrigerant Defective stop valve Defective outdoor unit PCB Troubleshooting Check No 01 Refer to P 87 Check No 12 Refer to P 89 Check No 14 Refer to P 90...

Page 80: ...er thermistor Defective outdoor unit PCB Troubleshooting Check No 01 Refer to P 87 Check No 12 Refer to P 89 Check No 17 Refer to P 92 Check No 18 Refer to P 93 Check No 19 Refer to P 93 R14413 Cautio...

Page 81: ...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 off...

Page 82: ...n circuit Malfunction Decision Conditions The compressor fails to start in about 15 seconds after the compressor run command signal is sent If the error repeats the system is shut down Reset condition...

Page 83: ...ace the outdoor unit PCB Replace the compressor Correct the power supply or replace the outdoor unit PCB Reconnect them as specified Replace the outdoor unit PCB Inverter checker Part No 1225477 NO YE...

Page 84: ...he input current Malfunction Decision Conditions The compressor running frequency is above 52 Hz The input current is also below 0 1 A If the error repeats the system is shut down Reset condition Cont...

Page 85: ...ith the power 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 thermisto...

Page 86: ...t exchanger thermistor Replace the outdoor unit PCB Error displayed again on remote controller Indoor heat exchanger thermistor functioning Check No 01 Check the thermistor resistance value Check No 0...

Page 87: ...n Decision Conditions With the compressor off the radiation fin temperature is above A C The error is cleared when the radiation fin temperature drops below B C To cool the electrical components the o...

Page 88: ...NO YES Turn off the power and turn it on again Check the radiation fin temperature Check No 17 Check the installation condition Radiation fin dirty Above A C Check No 19 Check the outdoor fan or relat...

Page 89: ...fin temperature with the compressor 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...

Page 90: ...perature Check No 17 Check 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 PCB been replaced Check if the sil...

Page 91: ...curs 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...

Page 92: ...Check the power module Check No 17 Check the installation condition Check No 15 Check with the inverter checker Turn off the power and disconnect the harnesses U V and W Turn off the power and reconn...

Page 93: ...The following conditions continue for 7 minutes Input current input voltage A output frequency B Output frequency C Refrigerant shortage detection II The following conditions continue for 80 seconds O...

Page 94: ...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 them as required Also...

Page 95: ...detection in approximately 10 seconds Outdoor Unit Low voltage detection The voltage detected by the DC voltage detection circuit is below 180 V The compressor stops if the error occurs and restarts a...

Page 96: ...rs or parts may be damaged NO NO YES NO YES YES Reconnect it Check the power supply voltage Check the connection of the compressor harness Disturbance factors Noise Power supply distortion Repeat a fe...

Page 97: ...is directly mounted on the PCB disconnect the connector for the PCB and measure Thermistor temperature C Resistance k Room temperature thermistor Other thermistors 20 73 4 211 0 15 57 0 150 0 10 44 7...

Page 98: ...PCB Replace the PCB If NG in step 2 Defective Hall IC Replace the fan motor If OK in both steps 1 and 2 Replace the PCB The connector has 3 pins 5 3 Power Supply Waveforms Check Check No 11 Measure t...

Page 99: ...ching sound 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...

Page 100: ...coil 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 22...

Page 101: ...inals of the compressor are not FASTON terminals difficult to remove the wire on the terminals it is possible to connect wires available on site to the outdoor unit from output side of PCB Do not conn...

Page 102: ...The LEDs look like they are lit 2 On completion of diagnose by the inverter checker be sure to re crimp the FASTON terminals Otherwise the terminals may be burned due to loosening 5 8 Installation Co...

Page 103: ...alled at the site Clean the dirty one Replace the compressor Discharge pressure check Check the outdoor fan system R12010 NO NG YES Reconnect the connector Replace the fan motor Replace the fan motor...

Page 104: ...outdoor unit PCB To disengage the connector press the protrusion on the connector Follow the procedure below to measure resistance between the terminals of the DB1 and the terminals of the compressor...

Page 105: ...trical Box Vertical Blades 102 1 6 Removal of Swing Motor PCBs 107 1 7 Removal of Indoor Heat Exchanger 111 1 8 Removal of Fan Rotor Fan Motor 114 1 9 Exchange of Drain Hose Piping Direction 117 2 Out...

Page 106: ...ignal reception When the ON OFF button is kept pressed for 5 seconds the forced cooling operation is performed for about 15 minutes 2 Remove the air filters 1 Open the front panel to the position wher...

Page 107: ...air filter and unfastening the projections from the air filter frame 3 Remove the Titanium apatite photocatalytic air purifying filter from its frame at 5 positions by bending it To prevent the damage...

Page 108: ...hile bending the horizontal blade slightly The center shaft can be released easily by bending the blade Cautions for reassembling 1 Since the key pattern hook is provided rotate the horizontal blade a...

Page 109: ...SiBE041102_A Indoor Unit Removal Procedure 99 5 Remove the horizontal blade Step Procedure Points R11626...

Page 110: ...l over the position where it stops 2 Release the right rotary shaft The rotary shaft on each side can be released easily by sliding each shaft inwards 3 Release the left rotary shaft 4 Remove the fron...

Page 111: ...as 3 hooks on the upper part Refer to the removal procedure in a reverse way when reassembling 3 Press each hook and also lift the grille up to unfasten the hooks 4 Pull the upper part of the front gr...

Page 112: ...isconnect the connecting wires Preparation Remove the front grille according to the Removal of Front Grille 1 Remove the screw of the service cover 2 Pull out the service cover down in the direction o...

Page 113: ...power supply red 3 transmission yellow green earth 6 Pull out the indoor heat exchanger thermistor Take care not to lose the clip of thermistor 2 Remove the electrical box 1 Remove the screw and disc...

Page 114: ...the screw of the electrical box 4 Slide the electrical box to the right first and detach the horizontal blade from the electrical box 5 Pull the electrical box There is a hook on the bottom frame Whe...

Page 115: ...rd Repeat the same procedure to remove the fan guard on the other side The right fan guard has sealing materials on the right side 3 Unfasten the hooks at the upper 2 positions A vertical blade ASSY h...

Page 116: ...re 4 Unfasten the 3 hooks at the shaft mounting part by pressing them with a flat screwdriver 5 Remove the vertical blade ASSY Repeat the same procedure to remove the vertical blade ASSY on the other...

Page 117: ...re Points 1 Remove the shield plate 2 Preparation Remove the electrical box according to the Removal of Electrical Box vertical Blades 1 Unfasten the hooks at the upper 2 positions of the shield plate...

Page 118: ...swing motor has a hook Press the hook with a flat screwdriver to unfasten it 3 Remove the display PCB 1 Unfasten the hook and release the display PCB ASSY 2 Turn over the display PCB ASSY and unfaste...

Page 119: ...splay PCB S27 for control PCB 4 Remove the control PCB 1 Lift the shield plate 1 and unfasten the 2 hooks 2 Slide the shield plate 1 and remove it 3 Release the harnesses from the hooks Step Procedure...

Page 120: ...en without sleeve upper green with sleeve lower 5 Release the 4 hooks Lift up the upper part of the control PCB and remove it 6 The figure shows the control PCB Refer to page 7 for detail S1 S7 fan mo...

Page 121: ...sucked in to generate an over pressure in the refrigeration cycle thus resulting in pipe rupture or accidental injury If the drain hose is embedded in the wall disconnect the drain hose beforehand 1...

Page 122: ...iping with 2 wrenches 2 Remove the indoor heat exchanger 1 Remove the indoor unit from the installation plate 2 Unfasten the hook of the piping fixture on the back of the indoor unit Step Procedure Po...

Page 123: ...oor heat exchanger be sure to wear gloves or wrap it with cloth before proceeding to the work You may be injured by the fins 5 Push and unfasten the hook on the right side and lift up the indoor heat...

Page 124: ...ff all power supplies before disassembling work Step Procedure Points 1 Remove the right side panel Preparation Remove the indoor heat exchanger according to the Removal of Indoor Heat Exchanger 1 Rem...

Page 125: ...fan rotor and the fan motor 1 The fan motor has 3 projections The fan rotor has a rotating shaft on the left side 2 Remove the fan rotor 3 Press the bearing from outside 4 Remove the bearing Step Proc...

Page 126: ...with approx 5 mm left 2 Tighten the screw until it stops Then turn the screw in one scroll 3 Move the fan rotor and confirm the fan motor and the fan rotor are installed appropriately 4 Tighten the s...

Page 127: ...at the left side with pliers and insert the removed drain plug into the right side with a hexagonal wrench 4 mm 3 Insert the drain hose to the left side and tighten it with the heat insulation fixing...

Page 128: ...bling work Step Procedure Points 1 Appearance features Take care not to cut your finger by the fins of the outdoor heat exchanger 2 Remove the panels The stop valve cover is united with the shield pla...

Page 129: ...emove the 5 screws of the front panel 4 Unfasten the right side hooks 5 Unfasten the left side hooks and remove the front panel 6 7 Remove the 4 screws of the discharge grille Unfasten the 6 hooks and...

Page 130: ...1 2 Remove the nut of the outdoor fan Remove the outdoor fan When reassembling align mark of the outdoor fan with D cut section of the motor shaft 2 Remove the fan motor S70 fan motor When reassemblin...

Page 131: ...k of the fan motor so as not to be entangled with the outdoor fan 4 Release the fan motor lead wire from the hooks When reassembling set the clamped position under the lower hook of the fan motor fixi...

Page 132: ...ure Points 1 Remove the PCB Preparation Remove the panels according to the Removal of Outer Panels 1 Remove the screws and release the connecting wires 2 Remove the 3 screws and remove the wire clamp...

Page 133: ...el 6 Remove the 4 screws on the right side panel 7 Unfasten the hook on the rear side When reassembling make sure to fit the hook 8 Release the outdoor temperature thermistor from the outdoor heat exc...

Page 134: ...t the earth 1 black upper 2 white lower 3 red upper green lower 11 Remove the screw and release the earth 12 Disconnect the connector S80 S80 four way valve coil The harness of the four way valve coil...

Page 135: ...onic expansion valve coil S40 overload protector S90 thermistors 14 Release the harnesses of S20 S40 S90 from the groove 15 Disconnect the terminals of the reactor 16 Disconnect the relay connector of...

Page 136: ...es of the relay connector and the reactor from the groove 18 Release the lead wires of the power supply and the earth from the groove 19 Remove the electrical box cover and insulation sheet Step Proce...

Page 137: ...5 screws 21 Unfasten the hook 22 Remove the PCB Refer to page 8 for detail S20 electronic expansion valve coil S40 overload protector S70 fan motor S80 four way valve coil S90 thermistors Step Procedu...

Page 138: ...e the 4 screws and remove the reactor 4 Remove the thermistors Pay attention so as not to lose the fixture When reassembling do not insert the thermistor up to the dent of fixture 1 Release the discha...

Page 139: ...p the outdoor heat exchanger thermistor and the harness of the electronic expansion valve coil 3 Release the outdoor heat exchanger thermistor Take care not to lose the clip of thermistor Step Procedu...

Page 140: ...10 minutes or more after turning off all power supplies before disassembling work Step Procedure Points 1 Remove the partition plate 1 Remove the 3 screws 2 Remove the partition plate When reassembli...

Page 141: ...et carefully 1 Lift and remove the sound blanket top 2 Pull the sound blankets outer and inner 2 out 3 Pull the sound blanket inner 1 out Since the piping ports on the sound blanket are torn easily re...

Page 142: ...ff all power supplies before disassembling work Step Procedure Points 1 Remove the peripheries 1 Remove the screw and remove the four way valve coil 2 Remove the terminal cover 3 Disconnect the termin...

Page 143: ...r Unit Removal Procedure 133 5 Remove the protection bushing 6 Remove the electronic expansion valve coil 7 Remove the putty Step Procedure Points Protection bushing R14530 Electronic expansion valve...

Page 144: ...our way valve and the deterioration of the gaskets affected by heat Keep below 120 C For the sake of this wrap the four way valve with wet cloth and provide water so that the cloth does not dry In cas...

Page 145: ...inside the four way valve and the deterioration of the gaskets affected by heat Keep below 120 C For the sake of this wrap the four way valve with wet cloth and provide water so that the cloth does n...

Page 146: ...tion and Field Settings 1 Pump Down Operation 137 2 Forced Cooling Operation 138 3 Trial Operation 139 4 Field Settings 140 4 1 When 2 Units are Installed in 1 Room 140 4 2 Jumper Settings 140 5 Appli...

Page 147: ...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 148: ...s not operating Start Press the forced cooling operation ON OFF button SW1 on the indoor unit for 5 seconds Command frequency 58 Hz End The forced cooling operation ends when any of the following cond...

Page 149: ...he system then restarts operation 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...

Page 150: ...to the following pages Indoor unit page 7 Outdoor unit page 8 ADDRESS EXIST CUT 1 2 JA ADDRESS JC JB JA R14580 Address EXIST CUT 1 2 Jumper R14262 Jumper Function When connected factory set When cut...

Page 151: ...n of the power transistor and the diode bridge Applying the paste should be implemented in accordance with the following instruction Note There is the possibility of failure with smoke in case of bad...

Page 152: ...SiBE041102_A 142 Appendix Part 9 Appendix 1 Piping Diagrams 143 1 1 Indoor Unit 143 1 2 Outdoor Unit 144 2 Wiring Diagrams 145 2 1 Indoor Unit 145 2 2 Outdoor Unit 146...

Page 153: ...ing Diagrams 1 1 Indoor Unit FTXN25 35KEV1B INDOOR UNIT HEAT EXCHANGER 7 0CuT 4 8CuT 7 0CuT 7 0CuT 7 0CuT CROSS FLOW FAN FIELD PIPING 6 4CuT M FAN MOTOR 9 5CuT FIELD PIPING 9 5CuT REFRIGERANT FLOW COO...

Page 154: ...OUR WAY VALVE ON HEATING DISCHARGE PIPE THERMISTOR GAS STOP VALVE LIQUID STOP VALVE MOTOR OPERATED VALVE MUFFLER WITH FILTER FAN MOTOR 3D066213A OUTDOOR UNIT HEAT EXCHANGER 7 0CuT 7 0CuT 7 0CuT MUFFLE...

Page 155: ...RED BLK WHT BLK BLK PUR GRY BLU BLK BLK BLK BLK BLK t M t R2T M 150 C M1S M1F NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK ON AGAIN V1 C70 C102...

Page 156: ...DGE FU1 FU2 FU3 FUSE IPM1 INTELLIGENT POWER MODULE L1 COIL L1R REACTOR M1C COMPRESSOR MOTOR M1F FAN MOTOR MR30 MRM10 MRCW MRL MAGNETIC RELAY Q1L OVERLOAD PROTECTOR PCB1 PRINTED CIRCUIT BOARD S20 S40 S...

Page 157: ...Revision History Month Year Version Revised contents 03 2011 SiBE041102 06 2011 SiBE041102_A Review of contents...

Page 158: ...ser s Manual provides important safety instructions and warnings Be sure to follow these instructions and warnings If you have any enquiries please contact your local importer distributor and or retai...

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