Daikin FTXN25L Service Manual
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Daikin FTXN25L Service Manual

Inverter wall mounted single split
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SERVICE MANUAL

Inverter Wall Mounted Single Split
MODELS
FTXN25/35/50/60L
FTXN25/35/50/60M
FTXK25/35/50/60A
FTXN25/35/50/60N
FTXC25/35/50/60A
FTXB50/60A
FTXB50/60B
FTXB50/60C
ATXN25/35/50/60L
ATXN25/35/50/60M
ATXN25/35/50/60N
ATXB50/60C
RXN25/35/50/60L
RXN25/35/50/60M
RXK25/35/50/60A
RXN25/35/50/60N
RXC25/35/50/60A
RXB50/60A
RXB50/60B
RXB50/60C
ARXN25/35/50/60L
ARXN25/35/50/60M
ARXN25/35/50/60N
ARXB50/60C
dd
SM-5WM-Y-EU-A3

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Summary of Contents for Daikin FTXN25L

  • Page 1: Service Manual

    SERVICE MANUAL Inverter Wall Mounted Single Split MODELS FTXN25/35/50/60L RXN25/35/50/60L FTXN25/35/50/60M RXN25/35/50/60M FTXK25/35/50/60A RXK25/35/50/60A FTXN25/35/50/60N RXN25/35/50/60N FTXC25/35/50/60A RXC25/35/50/60A FTXB50/60A RXB50/60A FTXB50/60B RXB50/60B FTXB50/60C RXB50/60C ATXN25/35/50/60L ARXN25/35/50/60L ATXN25/35/50/60M ARXN25/35/50/60M ATXN25/35/50/60N ARXN25/35/50/60N ATXB50/60C ARXB50/60C SM-5WM-Y-EU-A3...

  • Page 3: Table Of Contents

    Table of Contents Table of Contents 1.0 Inverter Single Split ......................1 1.1 Product line-up ......................1 1.2 Printed Circuit board (PCB) connector wiring diagram ..........4 1.3 Piping Length & Elevation ..................17 2.0 Function & Control .....................18 2.1 Temperature Control ....................18 2.2 Cooling and Heating Mode Operation ..............18 2.3 Fan Mode ......................18 2.4 Auto Mode ......................19 2.5 Cold Draft Prevention ....................20...
  • Page 4 Table of Contents 4.0 Wiring Connection ......................64 5.0 Refrigerant Diagram ....................70 6.0 Appendix A ........................72...
  • Page 5 Table of Contents Safety Cautions Caution and warnings • Be sure to read the following safety cautions before conducting repair work. • The caution items are classified into “ Warning” and “ Caution”. The “ Warning” items are especially important since they can lead to death or serious injury if they are not followed closely. The “...
  • Page 6 Table of Contents Caution Do not repair the electrical components with wet hands. Working on the equipment with wet hands can cause an electrical shock. Do not clean the air conditioner by splashing water. Washing the unit with water can cause an electrical shock. Be sure to provide the grounding when repairing the equipment in a humid or wet place, to avoid electrical shocks.
  • Page 7 Table of Contents Cautions Regarding Products after Repair Warning Be sure to use parts listed in the service parts list of the applicable model and appropriate tools to conduct repair work. Never attempt to modify the equipment. The use of inappropriate parts or tools can cause an electrical shock, excessive heat generation or fire.
  • Page 8 Table of Contents Caution Installation of a leakage breaker is necessary in some cases depending on the conditions of the installation site, to prevent electrical shocks. Do not install the equipment in a place where there is a possibility of combustible gas leaks.

  • Page 9: Inverter Single Split

    Inverter Single Split 1.0 Inverter Single Split 1.1 Product line-up 1.1.1 Indoor Unit Classification Nomenclature FTXN25/35LV1B FTXN50/60LV1B ATXN25/35LV1B ATXN50/60LV1B FTXB50/60AV1B FTXB50/60BV1B FTXN25/35MV1 FTXN50/60MV1 FTXN25/35MV1B FTXN50/60MV1B FTXN25/35MV1B9 FTXN50/60MV1B9 ATXN25/35MV1B ATXN50/60MV1B ATXN25/35MV1B7 ATXN50/60MV1B7 ATXN25/35MV16 ATXN50/60MV16 FTXK25/35AV1BW FTXK50/60AV1BW FTXK25/35AV1BS FTXK50/60AV1BS FTXN25/35NV1B FTXN50/60NV1B...
  • Page 10 Inverter Single Split 1.1.1 Indoor Unit Classification Nomenclature ATXN25/35NV1B ATXN50/60NV1B ATXN25/35NV1B9 ATXN50/60NV1B9 ATXN25/35NV1B7 ATXN50/60NV1B7 FTXB50/60CV1B ATXB50/60CV1B FTXC25/35AV1B FTXC50/60AV1B...
  • Page 11 Inverter Single Split 1.1.2 Outdoor Unit Classification Nomenclature RXN25/35LV1B9 RXN50/60LV1B9 ARXN25/35LV1B ARXN50/60LV1B RXB50/60AV1B RXB50/60BV1B RXN25/35MV1 RXN50/60MV1 RXN25/35MV1B RXN50/60MV1B RXN25/35MV1B9 RXN50/60MV1B9 ARXN25/35MV1B ARXN50/60MV1B ARXN25/35MV1B7 ARXN50/60MV1B7 ARXN25/35MV16 ARXN50/60MV16 RXK25/35AV1B RXK50/60AV1B RXN25/35NV1B RXN50/60NV1B ARXN25/35NV1B ARXN50/60NV1B ARXN25/35NV1B9 ARXN50/60NV1B9 RXB50/60CV1B ARXB50/60CV1B RXC25/35AV1B RXC50/60AV1B...

  • Page 12: Printed Circuit Board (Pcb) Connector Wiring Diagram

    Inverter Single Split 1.2 Printed Circuit board (PCB) connector wiring diagram 1.2.1 Indoor PCB: FTXN25/35L, FTXN25/35MV1, FTXN25/35MV1B9, ATXN25/35L, ATXN25/35MV1B, ATXN25/35MV1B7 1.2.1.1 Main PCB: W_2_03C Item Indication on PCB Description Connector for fan motor Connector for swing motor Connector for fan motor feedback Fuse Varistor Connector for wired handset...
  • Page 13 Inverter Single Split 1.2.1.2 Signal board Item Indication on PCB Description Operational LED Connector for Control PCB Handset signal receiver Operation ON/OFF switch Buzzer Applicable Model : FTXN25/35L, FTXN25/35MV1, FTXN25/35MV1B9, ATXN25/35L, ATXN25/35MV1B, ATXN25/35MV1B7...
  • Page 14 Inverter Single Split 1.2.2 Indoor PCB: FTXN25/35MV1B, FTXN25/35N, FTXK25/35A, FTXC25/35A, ATXN25/35MV16, ATXN25/35N 1.2.2.1 Main PCB: W_2_03D ; W_2_03E ; W_2_03E_M Item Indication on PCB Description Connector for fan motor Connector for swing motor Connector for fan motor feedback Fuse Varistor Connector for wired handset Connector for signal receiver PCB Connector for heat exchanger thermistor...
  • Page 15 Inverter Single Split 1.2.2.2 Signal board Item Indication on PCB Description Operational LED Connector for Control PCB Handset signal receiver Operation ON/OFF switch Buzzer Applicable Model : Applicable Model : FTXK25/35A FTXN25/35MV1B, FTXN25/35N, FTXC25/35A, ATXN25/35MV16, ATXN25/35N...
  • Page 16 Inverter Single Split 1.2.3 Indoor PCB: FTXB50/60A, FTXB50/60B, FTXB50/60C, FTXN50/60L, FTXN50/60M, FTXN50/60N, FTXK50/60A, FTXC50/60A, ATXB50/60C, ATXN50/60L, ATXN50/60M, ATXN50/60N 1.2.3.1 Main PCB: W_2_04A ; W_2_04B Item Indication on PCB Description Connector for fan motor Connector for swing motor Connector for fan motor feedback Fuse Varistor Connector for wired handset...
  • Page 17 Inverter Single Split 1.2.3.2 Signal board Item Indication on PCB Description Operational LED Connector for Control PCB Handset signal receiver Operation ON/OFF switch Buzzer Applicable Model : Applicable Model : FTXK50/60A FTXB50/60A, FTXB50/60B, FTXB50/60C, FTXN50/60L, FTXN50/60M, FTXN50/60N, FTXC50/60A ATXB50/60C, ATXN50/60L, ATXN50/60M, ATXN50/60N...
  • Page 18 Inverter Single Split 1.2.4 Outdoor PCB: RXN25/35N, RXK25/35A, RXC25/35A, ARXN25/35MV1B7, ARXN25/35MV16, ARXN25/35N 1.2.4.1 Main PCB Item Indication on PCB Description Connector for S10 on main PCB HL1, HN1, S Connector for terminal board E1, E2 Terminal for earth wire HL2, HN2 Connector for HL3 HN3 on main PCB HL4, HN4 Connector for S12 on main PCB...
  • Page 19 Inverter Single Split 1.2.5 Outdoor PCB: RXN25/35L, RXN25/35MV1, RXN25/35MV1B, RXN25/35MV1B9, ARXN25/35L, ARXN25/35MV1B 1.2.5.1 Filter PCB Item Indication on PCB Description Connector for indoor PCB Fuse (20A) V2, V3 Varistor...
  • Page 20 Inverter Single Split 1.2.5.2 Main PCB Item Indication on PCB Description Connector for filter PCB Connector for electronic expansion valve coil Connector for overload protector Connector for fan motor Connector for four way valve coil Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe) HL3, HN3 Connector for filter PCB FU1, FU2...
  • Page 21 Inverter Single Split 1.2.6 Outdoor PCB: RXB50/60B, RXB50/60C, RXN50/60M, RXN50/60N, RXK50/60A, RXC50/60A, ARXB50/60C, ARXN50/60M, ARXN50/60N 1.2.6.1 Filter PCB Item Indication on PCB Description Connector for indoor PCB Fuse (20A) V2, V3 Varistor...
  • Page 22 Inverter Single Split 1.2.6.2 Main PCB Item Indication on PCB Description Connector for filter PCB Connector for electronic expansion valve coil Connector for overload protector Connector for fan motor Connector for four way valve coil Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe) HL3, HN3 Connector for filter PCB FU1, FU2...
  • Page 23 Inverter Single Split 1.2.7 Outdoor PCB: RXB50/60A, RXN50/60L, ARXN50/60L 1.2.7.1 Main PCB Item Indication on PCB Description Connector for IPM PCB Connector for heat sink thermistor Connector for thermistors (outdoor air, heat exchanger, discharge pipe) Connector for electronic expansion valve coil A5, A6 Connector for display PCB Connector for four way valve coil...
  • Page 24 Inverter Single Split 1.2.7.2 IPM board: G202A_I Item Indication on PCB Description A1, A2, A3 Connector to compressor 1.2.7.3 Display board: G005A_D Item Indication on PCB Description Connector to control PCB 7 segment display...

  • Page 25: Piping Length & Elevation

    Inverter Single Split 1.3 Piping Length & Elevation Max. total piping Max. height Pre-charge for up Additional Model length, L (m) difference, E (m) to piping length (m) charge (g/m) RXN25, ARXN25, RXK25 RXN35, ARXN35, RXK35 RXN50, ARXN50, RXB50, RXK50 RXN60, ARXN60, RXB60, RXK60 RXC25...

  • Page 26: Function & Control

    Algorithm & Control 2.0 Function & Control 2.1 Temperature Control The temperature is detected by the room temperature thermistor (either on the unit or on the wired panel). The set temperature can be selected either through remote controller or wired controller by user. Target temperature Room thermistor temperature Set temperature...

  • Page 27: Fan Mode

    Algorithm & Control 2.2.2 Heating Mode: When Ts > Tr - 1.0°C • Compressor, Indoor Fan and Outdoor Fan ON. Tr - 1.5°C When ≤ • Compressor and Outdoor Fan OFF. Indoor Fan speed will change to Super Low. Tr = Room Temperature Ts = Set Temperature When heating load is too small, and the room temperature is still rising above compressor cut off point, compressor will stop.

  • Page 28: Cold Draft Prevention

    Algorithm & Control 2.5 Cold Draft Prevention During each thermal cut in cycle, the indoor fan speed will modulate according to the indoor heat exchanger temperature shown as below: 2.6 Sleep Mode SLEEP Mode can be activated through the remote controller to keep the thermal comfort while sleeping. SLEEP Mode continues operation at the target temperature for the first hour, then automatically raises the target temperature slightly in case of cooling, or lowers it slightly in case of heating.

  • Page 29: Quiet Function

    Algorithm & Control 2.7 Quiet function (Applicable for FTXK_A models) • Press for quiet operation. • Fan speed turns to minimum speed. • Press again to deactivate the function. • Available in HEAT and COOL modes only. • Any change of fan speed will deactivate this function. 2.8 ECO+ function (Applicable for FTXK_A models) • Press for eco-friendly mode cooling or heating operation. • Set temperature automatically adjusts to eco-friendly level. • Press again to deactivate the function. • Available in HEAT and COOL modes only. 2.9 Indoor-Outdoor Communication Master by outdoor unit. Indoor controller board will transmit signal to outdoor controller board every 0.5s. Outdoor unit will response to indoor once the valid data is received.

  • Page 30: Thermistors In Rxn,Rxb,Rxc,Arxn,Arxb

    Used for defrost & outdoor fan speed control. Also used for overall current protection Outdoor air & preheating operation control. Heat sink Used for capturing heat sink temperature. (Applicable for Daikin controller) Used for Electronic Expansion Valve (EXV) & suction pipe (SH) protection control in Suction pipe heating.
  • Page 31 Algorithm & Control Default setting Unit: Off Temperature: 24°C Fan speed: High Mode: Cooling Applicable for PCB W_2_03C Only (Refer product line up for model list) Cut off the jumper J_AUTO to disable the Auto Random Restart function Applicable for PCB W_2_03D , W_2_03E & W_2_03E_M (Refer product line up for model list) Cut off the jumper J_AUTO to disable the Auto Random Restart...

  • Page 32: Four Way Valve Control

    Algorithm & Control 2.14 Four Way Valve Control Change over switching is only carried out during operation. OFF delayed is applied when the coil switches from ON to OFF Operating mode 4-way valve is Heat, except for defrost Cool Defrost 2.15 Outdoor Fan Control Determine from • Compressor target rotation: higher fan speed with higher rotation.
  • Page 33 Algorithm & Control a Hz b Hz c Hz d Hz Max Hz Model (Time, s) (Time, s) (Time, s) (Time, s) (Time, s) RXN25/35L 38 (60) 52 (120) 66 (120) 80 (120) 94 (120) ARXN25/35L RXN50/60L 35 (60) 55 (120) 75 (360) ARXN50/60L RXB50/60A...

  • Page 34: Defrost Cycle

    Algorithm & Control 2.16.4 PI Control P control: ∆ T of each indoor is calculated at every sampling time of 20s and compressor rotation is adjusted according to the difference from the previously calculated rotation. I control: if the operating frequency is not changed more than a certain fixed time: • If Σ∆T is small : lower frequency. • If Σ∆T is large : increase frequency. 2.16.5 Limit Rotation Determine from • Upper limit rotation A minimum value was determined among the upper limits rotation, i.e. protection controls. • Lower limit rotation A maximum value was determined among the lower limits rotation, i.e.

  • Page 35: High Pressure Protection

    Algorithm & Control 2.19 High Pressure Protection To prevent high pressure in the system. Compressor operating frequency is adjusted based on upper limit of coil temperature. Upper Limit Coil Temperature 64°C Compressor frequency The compressor frequency is adjusted based on coil temperature: • During cooling mode : outdoor coil temperature.

  • Page 36: Oil Recovery Control (Applicable For Arxn,Rxn50/60L)

    Algorithm & Control 2.21 Oil Recovery Control (Applicable for ARXN/RXN50/60L) When the compressor operates for certain duration at low frequency, the oil level in the compressor may become low due to incomplete oil return. To prevent damage to the compressor or compressor lock due to low oil level. To promote refrigerant flow to carry the oil back to the compressor.

  • Page 37: Service Diagnosis

    Service Diagnosis 3.0 Service Diagnosis 3.1 Error Indication from Indoor 3.1.1 Indoor model FTXN25/35/50/60L/M, FTXB50/60/A/B/C ATXN25/35/50/60L/M, ATXB50/60C • LED display will either be ON during operation or blinking (green color) when any error occur as in below table. • The blinking pattern does not indicate error details •...
  • Page 38 Service Diagnosis 3.1.2 Indoor model FTXN25/35/50/60N, FTXC25/35/50/60A, ATXN25/35/50/60N • LED display will either be ON during operation or blinking (blue color) when any error occur as in below table. • The blinking pattern does not indicate error details • The error details needs to be retrieved from remote controller in error code form. LED blinks here Operation / Fault Indication SLEEP...
  • Page 39 Service Diagnosis 3.1.3 Indoor model FTXK25/35/50/60A • LED display will either change color under different running condition or blinking (blue color) when any error occur as in below table. • The blinking pattern does not indicate error details. • The error details needs to be retrieved from remote controller in error code form. Operation / Fault Indication COOL/HEAT/TIMER (BLUE/RED/VIOLET)

  • Page 40: Error Code Retrieved By Handset

    Service Diagnosis 3.2 Error Code retrieved by remote controller 3.2.1 Remote controller model BRC52A61 & BRC52B63 Mode button ON/OFF button ON TIMER ON TIMER OFF TIMER CANCEL OFF TIMER CANCEL CANCEL button CANCEL button button button Operating Guide 1. Hold down ON TIMER CANCEL or OFF TIMER CANCEL for 5 seconds until ‘‘ ’’ indication flashes on the remote controller temperature display section.
  • Page 41 Service Diagnosis Last State Error retrieved by remote controller BRC52A61 & BRC52B63 Operating Guide 1. Remove battery from remote controller. 2. Replace battery again into remote controller. 3. Press Mode & ON/OFF buttons together. 4. The “ ” will show at temperature section. 5.

  • Page 42: Error Indication From Outdoor

    Service Diagnosis 3.3 Error Indication from Outdoor 3.3.1 ARXN/RXN50/60L , RXB50/60A - 7 Segment Display It is located inside outdoor unit control panel beside the terminal block. Control panel cover has to be removed to get access to the 7 segment display. When there is no error, the compressor running frequency is displayed.
  • Page 43 Service Diagnosis Parameter Parameter Description Unit/Range Number Compressor Actual Rotation Compressor Target Rotation DC Bus Voltage Total Current (x10) Outdoor Air Temperature °C Outdoor Heat Exchanger Temperature °C Compressor Discharge Temperature °C Outdoor Heatsink Temperature °C Indoor Air Temperature °C Indoor Heat Exchanger Temperature °C Electronic Expansion Valve Opening...

  • Page 44: Error Code Description For Inverter

    Service Diagnosis 3.4 Error code description for Inverter ARXN/RXN25/35L ARXN/ ARXN/RXN25/35M/N ERROR ERROR DESCRIPTION RXN50/60L ARXN/RXN50/60M/N CODE RX50/60A RXB50/60B RXK25/35/50/60A NORMAL INDOOR PCB ABNORMALITY ANTIFREEZE PROTECTION OR HIGH PRESSURE CONTROL INDOOR FAN MOTOR ABNORMALITY INDOOR HEAT EXCHANGER THERMISTOR ABNORMALITY INDOOR ROOM THERMISTOR ABNORMALITY OUTDOOR PCB ABNORMALITY COMPRESSOR OVERLOAD...
  • Page 45 Service Diagnosis Description INDOOR PCB ABNORMALITY Possible Root 1. Faulty indoor PCB. cause 2. Faulty connector connection at indoor. Troubleshooting Turn off unit. Check indoor PCB connector conditions (including PCB to terminal block and all PCB wire connector). Any sign Connect correctly and of loose or operate again.
  • Page 46 Service Diagnosis Description ANTIFREEZE PROTECTION OR HIGH PRESSURE CONTROL Possible Root 1. Indoor air filter, heat exchanger block due to dust accumulation. cause 2. Indoor air short circuit. 3. Indoor coil thermistor faulty. 4. Indoor PCB faulty. 5. Fan blower dirty. Troubleshooting Check indoor air flow. Any air short Provide sufficient air passage.
  • Page 47 Service Diagnosis Description INDOOR FAN MOTOR ABNORMALITY Possible Root 1. Indoor fan motor winding short, or the motor lead wire broken. cause 2. Indoor PCB faulty. Troubleshooting Turn off power supply and rotate fan by hand. Change fan motor. Does it rotate? Check fan motor connector condition.
  • Page 48 Service Diagnosis Description INDOOR ROOM THERMISTOR ABNORMALITY Possible Root 1. Thermistor, connector faulty. cause 2. Indoor PCB faulty. Troubleshooting Check the thermistor connector condition. Correct the connection Normal? Check thermistor resistance value. # Refer thermistor resistance table.(Page 72, item 6.1) Replace thermistor Normal? Replace PCB.
  • Page 49 Service Diagnosis Description OUTDOOR PCB ABNORMALITY Possible Root 1. Micro Controller program run-away due to external factor such as Noise, Momentary voltage cause drop, Momentary power failure. 2. Damage of EEPROM. 3. Faulty outdoor unit PCB. 4. Broken hardness between PCB. Troubleshooting Turn on the power again.
  • Page 50 Service Diagnosis E5 (All models except ARXN/RXN50/60L , RXB50/60A) Description COMPRESSOR OVERLOAD Possible Root 1. Refrigerant Shortage. cause 2. 4 way valve malfunction. 3. Stop valve malfunction. 4. Outdoor unit PCB defective. 5. Water mixed in refrigerant. 6. Electronic expansion valve defective. 7.
  • Page 51 Service Diagnosis E5 (ARXN/RXN50/60L , RXB50/60A) Description COMPRESSOR OVERLOAD Possible Root 1. Refrigerant Shortage. cause 2. 4 way valve malfunction. 3. Electronic expansion valve defective. 4. Outdoor unit PCB defective. 5. Water mixed in refrigerant. Troubleshooting Turn off unit. Disconnect compressor wire hardness (U.V.W) and check winding.
  • Page 52 Service Diagnosis Description COMPRESSOR LOCK/START-UP ABNORMALITY Possible Root 1. Compressor locked. cause 2. Compressor harness disconnect. Troubleshooting Turn off power. Disconnect harnesses U, V and Check with Inverter analyzer. Correct power supply or Normal? replace outdoor unit PCB. Turn off power and reconnect harnesses.
  • Page 53 Service Diagnosis Description OUTDOOR FAN MOTOR LOCK Possible Root 1. Fan motor breakdown. cause 2. Harness or connector disconnected between fan motor and PCB or in poor contact. 3. Foreign matter stuck in fan. 4. Defective outdoor unit PCB. Troubleshooting Fan motor Turn off power and connector...
  • Page 54 Service Diagnosis Description AC INPUT OVER CURRENT Possible Root 1. Over current due to compressor failure. cause 2. Over current due to defective outdoor unit PCB. 3. Over current due to defective power transistor. 4. Over current due to short-circuit. Troubleshooting Measure the input current.
  • Page 55 Service Diagnosis Description 4 WAY VALVE ABNORMALITY Possible Root 1. Thermistor defective. cause 2. 4 way valve defective. 3. Outdoor PCB defective. 4. Insufficient gas. 5. Foreign substance mixed in refrigerant. 6. Stop valve defective. 7. Disconnect of 4 way valve coil. Troubleshooting Four way valve Correct the four way valve...
  • Page 56 Service Diagnosis Description DISCHARGE PIPE OVERHEAT Possible Root 1. Refrigerant shortage. cause 2. Four way valve malfunctioning. 3. Discharge pipe thermistor defective. 4. Outdoor PCB defective. 5. Water mixed in the local piping. 6. EXV defective. 7. Stop Valve defective. Troubleshooting Malfunction Replace the defective...
  • Page 57 Service Diagnosis Description HEAT EXCHANGER OVERHEAT Possible Root 1. The installation space is not large enough. cause 2. Faulty outdoor fan motor. 3. Faulty EXV. 4. Faulty outdoor heat exchanger thermistor. 5. Faulty stop valve. 6. Dirty heat exchanger. 7. Unit overcharge. 8.
  • Page 58 Service Diagnosis H0 (ARXN/RXN/RXB50/60A) Description COMPRESSOR SENSOR SYSTEM ABNORMAL Possible Root 1. Broken and disconnected harness. cause 2. Outdoor unit PCB defective. 3. Defective compressor. Troubleshooting Check reactor connection. Connect back reactor. Any abnormal? # Disconnect the reactor wire and measure Check reactor resistance.
  • Page 59 Service Diagnosis H0 (ARXN/RXN25/35M/N, RXK25/35A) Description COMPRESSOR SENSOR SYSTEM ABNORMAL Possible Root 1. Broken and disconnected harness. cause 2. Outdoor unit PCB defective. Troubleshooting Check the harness S30. Is the harness Replace the harness. broken? Turn off the power and turn it on again.
  • Page 60 Service Diagnosis H6 (ARXN/RXN50/60L, RXB50/60A) Description POSITION SENSOR ABNORMAL (COMPRESSOR) Possible Root 1. Compressor relay cable disconnected. cause 2. Compressor itself defective. 3. Outdoor PCB defective. 4. Stop valve closed. 5. Input voltage out of specification. Troubleshooting Check for short circuit. Replace the outdoor unit Normal? PCB, outdoor unit fan.
  • Page 61 Service Diagnosis H6 (RXN25/35M/N, RXK25/35A) Description POSITION SENSOR ABNORMAL (COMPRESSOR) Possible Root 1. Compressor relay cable disconnected. cause 2. Compressor itself defective. 3. Outdoor PCB defective. 4. Stop valve closed. 5. Input voltage out of specification. Troubleshooting Check for short circuit. Replace the outdoor unit Normal? PCB, outdoor unit fan.
  • Page 62 Service Diagnosis H6 (ARXN/RXN50/60M/N, RXK50/60A) Description POSITION SENSOR ABNORMAL (COMPRESSOR) Possible Root 1. Compressor relay cable disconnected. cause 2. Compressor itself defective. 3. Outdoor PCB defective. 4. Stop valve closed. 5. Input voltage out of specification Troubleshooting Turn off the power. Check the power supply voltage. Correct the power supply.
  • Page 63 Service Diagnosis Description AC CURRENT SENSOR ABNORMALITY Possible Root 1. Internal wiring broken. cause 2. Outdoor unit PCB defective. Troubleshooting Check compressor harness connection. Reconnect it correctly. Connection correct? Restart the system and check connector between main board and IPM board. Does it connect Reconnect it properly.
  • Page 64 Service Diagnosis H9, J3, J6, P4 Description Thermistor or related abnormality OUTDOOR AIR THERMISTOR ABNORMALITY COMPRESSOR DISCHARGE PIPE THERMISTOR ABNORMALITY OUTDOOR HEAT EXCHANGER THERMISTOR ABNORMALITY P4: HEAT SINK THERMISTOR ABNORMALITY Possible Root 1. Disconnection of the connector for the thermistor. cause 2.
  • Page 65 Service Diagnosis Description ELECTRICAL BOX TEMPERATURE RISE (COMPRESSOR OFF) Possible Root 1. Fin temperature rise due to defective outdoor unit fan. cause 2. Fin temperature rise due to short circuit. 3. Fin thermistor defective. 4. Connector in poor contact. 5. Outdoor unit PCB defective. Troubleshooting Turn off the unit and turn on back after 20 mins.
  • Page 66 Service Diagnosis Description Heat sink overheat Possible Root 1. Fin temperature rise due to short circuit. cause 2. Fin temperature rise due to defective outdoor unit fan. 3. Fin thermistor defective. 4. Connector in poor contact. 5. Outdoor unit PCB defective. 6.
  • Page 67 Service Diagnosis Description IPM ABNORMALITY Possible Root 1. Over current due to defective power transistor. cause 2. Over current due to wrong internal wiring. 3. Over current due to abnormal supply voltage. 4. Over current due to defective PCB. 5. Error detection due to defective PCB. 6.
  • Page 68 Service Diagnosis Description INSUFFICIENT GAS Possible Root 1. Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger,room or cause outdoor temperature thermistor. 2. Closed stop valve. 3. Refrigerant shortage (refrigerant leakage). 4. Poor compression performance of compressor. 5. Defective electronic expansion valve. Troubleshooting Check stop valve.
  • Page 69 Service Diagnosis Description DC VOLTAGE OUT OF RANGE Possible Root 1. Power supply voltage is not as specified. cause 2. Defective DC voltage detection circuit. 3. Defective over-voltage detection circuit. 4. Defective PAM control part. 5. Disconnection of compressor harness 6. Short circuit inside the fan motor winding. 7.
  • Page 70 Service Diagnosis Description COMMUNICATION ABNORMALITY Possible Root 1. Faulty outdoor unit PCB. cause 2. Faulty indoor unit PCB. 3. Indoor unit – outdoor unit signal transmission error due to wiring error. 4. Indoor unit – outdoor unit signal transmission error due to disturbed power supply waveform. 5. Indoor unit – Outdoor unit signal transmission error due to breaking of wire in the connection wires between the indoor and outdoor units Troubleshooting Check the power supply voltage. Is the voltage fluctuation Correct the power supply.
  • Page 71 Service Diagnosis Description INSTALLATION ABNORMALITY Possible Root 1. Wrong models interconnected. cause 2. Wrong indoor unit PCB mounted. 3. Indoor unit PCB defective. 4. Wrong outdoor unit PCB mounted or defective. Troubleshooting Check the combination of the indoor and outdoor unit. Match the compatible models.

  • Page 72: Wiring Connection

    Wiring Connection 4.0 Wiring Connection Model: FTXN25/35L-RXN25/35L / ATXN25/35L-ARXN25/35L / FTXN25/35MV1-RXN25/35MV1 / FTXN25/35MV1B-RXN25/35MV1B / FTXN25/35MV1B9-RXN25/35MV1B9 / ATXN25/35MV1B-ARXN25/35MV1B POWER SUPPLY 220-240V/1Ph/50Hz...
  • Page 73 Wiring Connection Model: ATXN25/35MV16-ARXN25/35MV16 / ATXN25/35MV1B7-ARXN25/35MV1B7 / ATXN20MV16-ARXN20MV16 NOTATION FM: FAN MOTOR AS: AIR SWING MOTOR TH1: ROOM SENSOR POWER SUPPLY 220-240V/1Ph/50Hz 2 SIG...
  • Page 74 Wiring Connection Model: FTXN25/35N-RXN25/35N / ATXN25/35N-ARXN25/35N / FTXK25/35A-RXK25/35A / FTXC25/35A-RXC25/35A POWER SUPPLY 220-240V/1Ph/50Hz...
  • Page 75 Wiring Connection Model: FTXN50/60L-RXN50/60L / ATXN50/60L-ARXN50/60L / FTXB50/60A-RXB50/60A POWER SUPPLY 220-240V/1Ph/50Hz...
  • Page 76 Wiring Connection Model: FTXN50/60M-RXN50/60M / FTXB50/60B-RXB50/60B / ATXN50/60M-ARXN50/60M POWER SUPPLY 220-240V/1Ph/50Hz...
  • Page 77 Wiring Connection Model: FTXN50/60N-RXN50/60N / ATXN50/60N-ARXN50/60N / FTXB50/60C-RXB50/60C / FTK50/60A-RXK50/60A / ATXB50/60C-ARXB50/60C / FTXC50/60A-RXC50/60A (OPTIONAL) NOTATION: FAN MOTOR AIR SWING MOTOR TH1: ROOM SENSOR Z1C,Z2C: FERRITE CORE ----------- FIELD WIRING POWER SUPPLY 220-240V/1Ph/50Hz...

  • Page 78: Refrigerant Diagram

    Refrigerant Diagram 5.0 Refrigerant Diagram Model: ATXN/FTXN_L / ARXN/RXN_L / FTXB_A / RXB_A / ATXN/FTXN25/35M/N / ARXN/RXN25/35M/N / FTXK25/35A / RXK25/35A / FTXC25/35A / RXC25/35A Model: FTXC50A/RXC50A MUFFLER 3 WAY VALVE...
  • Page 79 Refrigerant Diagram Model: FTXB_B / RXB_B / ATXN/FTXN50/60/M/N / ARXN/RXN50/60/M/N / FTXK50/60A / RXK50/60A / ATXB/FTXB_C / ARXB/RXB_C...

  • Page 80: Appendix A

    Refrigerant Diagram 6.0 Appendix A 6.1 Thermistor resistance checking procedures Remove the connectors of thermistors at PCB and measure resistance of each thermistor using tester as shown below. Tester Resistance range Resistance value refer to Resistance table below. RXN/ARXN25/35L RXN/ARXN25/35/50/60M RXN/ARXN50/60L RXN/ARXN25/35/50/60N RXB50/60A...
  • Page 81 Refrigerant Diagram Table 2: Resistance R25 = 10K ohm t°C Rmin (kΩ) Rnom (kΩ) Rmax (kΩ) t°C Rmin (kΩ) Rnom (kΩ) Rmax (kΩ) 44.20 45.30 46.50 42.10 43.20 44.30 5.47 5.56 5.64 40.20 41.20 42.20 5.28 5.37 5.45 38.30 39.20 40.20 5.10 5.18...
  • Page 82 Refrigerant Diagram 6.2 Electronic Expansion Valve (EXV) checking procedures a. Check if the EXV connector is correctly connected to PCB. b. Turn power off and on again, and check if EXV generates a latching sound. c. If the EXV does not generate a latching sound in above step b., disconnect connector and check continuity using a multimeter.
  • Page 83 Refrigerant Diagram 6.3.2 Class 50/60 Turn power off and then on again. *Four way valve coil Not Energized Start heating operation. Heating: Energized S80 voltage at 220-240VAC with Replace outdoor PCB. compressor on? *Refer Figure 1 below. Disconnect four way valve coil from connector and check the continuity.
  • Page 84 Refrigerant Diagram 6.5 Rotation pulse check on outdoor unit PCB 6.5.1 Turning speed pulse input on outdoor unit PCB check for (A)RXN25/35L, RXN25/35MV1 & RXN25/35MV1B a. Make sure control voltage of DC15V is being applied. b. Make a turn of the fan motor with hand and make sure the pulse (0-15V) appears 4 times at pins 10 and 13.

  • Page 85: Installation Condition Check

    Refrigerant Diagram 6.6 Installation condition check Installation condition check. Check the allowable dimensions Change the installation location of the air suction and ,direction or remove obstacles. discharge area. Is the discharged air Change the installation location short-circuited? ,direction or remove obstacles. Is the Clean the outdoor heat outdoor heat...
  • Page 86 Refrigerant Diagram 6.8 Diode bridge short circuit check procedures 6.8.1 Power transistor check for class 25 & class 35 Check to make sure that the voltage between the terminal of Power transistor (+) and (-) is approx. 0 volt before checking power transistor. <Measuring method>...
  • Page 87 Refrigerant Diagram 6.9 Power supply waveforms check procedures Measure the power supply waveform between No. 1(Live) and No. 2(Neutral) on the terminal board, and check the waveform disturbance with osciloscope. • Check if the power supply waveform is a sine wave (Fig. 1). • Check if there is waveform disturbance near the zero cross (sections circled in Fig.

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