Daikin FTXB50BV1B Service Manual
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Daikin FTXB50BV1B Service Manual

Inverter wall mounted single split
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SERVICE MANUAL
Inverter
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SM-5WMY-A1

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Summary of Contents for Daikin FTXB50BV1B

  • Page 1 R410A SERVICE MANUAL Inverter Single Split SM-5WMY-A1...

  • Page 2: 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 ..........2 1.3 Piping Length & Elevation ..................12 2.0 Function & Control .....................13 2.1 Temperature Control ....................13 2.2 Cooling and Heating Mode Operation ..............13 2.3 Fan Mode ......................14 2.4 Auto Mode ......................14 2.5 Cold Draft Prevention ....................15...

  • Page 3: Safety Cautions

    Safety Cautions Cautions and Be sure to read the following safety cautions before conducting repair work. The caution items are classified into “ Warning” and “ Caution”. The “ Warning” Warnings items are especially important since they can lead to death or serious injury if they are not followed closely.

  • Page 4: Cautions Regarding Products After Repair

    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 5: Inspection After Repair

    Warning Be sure to use the specified cable to connect between the indoor and outdoor units. Make the connections securely and route the cable properly so that there is no force pulling the cable at the connection terminals. Improper connections can cause excessive heat generation or fire. When connecting the cable between the indoor and outdoor units, make sure that the terminal cover does not lift off or dismount because of the cable.

  • Page 6: Using Icons

    Caution Check to see if the parts and wires are mounted and connected properly, and if the connections at the soldered or crimped terminals are secure. Improper installation and connections can cause excessive heat generation, fire or an electrical shock. If the installation platform or frame has corroded, replace it.

  • Page 7: Inverter Single Split

    Inverter Single Split 1.0 Inverter Single Split 1.1 Product line-up 1.1.1 Indoor Unit Classifi cation Nomenclature FTXB50/60BV1B FTXN25/35/50/60MV1 FTXN25/35/50/60MV1B FTXN25/35/50/60MV1B9 ATXN25/35/50/60MV1B 1.1.2 Outdoor Unit Classifi cation Nomenclature RXB50/60BV1B RXN25/35/50/60MV1 RXN25/35/50/60MV1B RXN25/35/50/60MV1B9 ARXN25/35/50/60MV1B RX50/60CGXV1...

  • Page 8: Printed Circuit Board (Pcb) Connector Wiring Diagram

    Inverter Single Split 1.2 Printed Circuit board (PCB) connector wiring diagram 1.2.1 Indoor PCB: ATXN/FTXN25/35L/M 1.2.1.1 Main PCB 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 9 Inverter Single Split 1.2.1.2 Signal board Item Indication on PCB Description Operation ON/OFF switch Led for sleep (red) Led for timer (yellow) Led for operation Connector for control PCB...
  • Page 10 Inverter Single Split 1.2.2 Indoor PCB: FTXB50/60B, ATXN/FTXN50/60L/M 1.2.2.1 Main PCB Item Indication on PCB Description Connector for fan motor Connector for swing motor Connector for wired panel Connector for Signal Receiver PCB Connector for heat exchanger thermistor Varistor Fuse...
  • Page 11 Inverter Single Split 1.2.2.2 Signal board Item Indication on PCB Description Connector for Control PCB LED for operation LED for timer (yellow) LED for sleep (red) Operation ON/OFF switch...
  • Page 12 Inverter Single Split 1.2.3 Outdoor PCB: ARXN/RXN25/35L/M 1.2.3.1 Filter PCB Item Indication on PCB Description Connector for indoor PCB Fuse (20A) V2, V3 Varistor...
  • Page 13 Inverter Single Split 1.2.3.2 Main PCB Item Indication on PCB Description Connector for fi lter 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 fi...
  • Page 14 Inverter Single Split 1.2.4 Outdoor PCB: RXB50/60B, ARXN/RXN50/60M 1.2.4.1 Filter 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 Fuse (3.15A, 250V)
  • Page 15 Inverter Single Split 1.2.4.2 Main PCB Item Indication on PCB Description Connector for S11 on fi lter PCB Connector for HL4 HN4 on fi lter PCB Connector for electronic expansion valve coil Connector for overload protector Connector for magnetic relay Connector for fan motor Connector for four way valve coil Connector for thermistors (outdoor temperature, outdoor...
  • Page 16 Inverter Single Split 1.2.5 Outdoor PCB: ARXN/RXN50/60L 1.2.5.1 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 Connector for fan motor...
  • Page 17 Inverter Single Split 1.2.5.2 IPM board Item Indication on PCB Description A1, A2, A3 Connector to compressor 1.2.5.3 Display board Item Indication on PCB Description Connector to control PCB 7 segment display...

  • Page 18: Piping Length & Elevation

    Inverter Single Split 1.3 Piping Length & Elevation Max. total piping Max. height Pre-charge for up Additional Model length (m) difference (m) to piping length (m) charge (g/m) ARXN/RXN25M ARXN/RXN35M ARXN/RXN50M RXB50B RX50CG ARXN/RXN60M RXB60B RX60CG...

  • Page 19: Function & Control

    Function & Control 2.0 Function & Control 2.1 Temperature Control Temperature detected by room temperature thermistor (either on the unit or on wired panel). Set temperature is select by user using wireless handset or wired handset. Target temperature Room thermistor temperature Set temperature Room temperature 2.2 Cooling and Heating Mode Operation...

  • Page 20: Fan Mode

    Function & 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 remained ON. • Indoor Fan off if indoor coil ≤ 20°C. Tr = Room Temperature Ts = Set Temperature When heating load is too small, and the room temperature still rising above compressor cut off point,...

  • Page 21: Sleep Mode

    Function & Control 2.6 Sleep Mode SLEEP Mode can be activated by pressing from the remote controller to keep the thermal comfort during sleeping. SLEEP Mode continues operation at the target temperature for the fi rst one hour, then automatically raises the target temperature slightly in the case of cooling, or lowers it slightly in the case of heating.

  • Page 22: Thermistors In Arxn/Rxn_L/M, Rxb_B

    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 23: Auto Restart

    Function & Control 2.10 Auto Restart Factory pre-set. Allow unit to automatically resume the same operating mode it was in before a power failure. 2.11 Auto Random Restart Unit restarts automatically in 64 different recovery timing patterns (within 180 seconds to 244 seconds) and operate based on the previous setting (operating mode, temperature setting and fan speed).

  • Page 24: Outdoor Fan Control

    Function & Control 2.13 Outdoor Fan Control Determine from • Compressor target rotation: higher fan speed with higher rotation. • Outdoor air temperature. Cool mode: Higher fan speed with higher outdoor air temperature. Heat mode: Higher fan speed with lower outdoor air temperature. When compressor stops, fan OFF delay 30 seconds is carried out 2.14 Rotation Regulating Functions Upper limit rotation...
  • Page 25 Function & Control 2.14.2 Command Rotation Cut in upon termination of Starting Control. Achieve capacity control by controlling the compressor rotation based on: • Temperature difference between set and room temperature, ∆T. • Limit Rotation. • Defrost control. 2.14.3 Fuzzy Control Based on temperature difference, ∆T, current fan speed setting &...

  • Page 26: Defrost Cycle

    Function & Control 2.15 Defrost Cycle During defrost All models Compressor 4-way valve EXV in operation room Fixed opening Outdoor fan Indoor fan Condition for entering defrost • Compressor minimum run time – 6 minutes OR • Compressor accumulated run time of 45 minutes if Outdoor coil < 3°C. Condition for terminating defrost •...

  • Page 27: Discharge Pipe Temperature Control

    Function & Control 2.18 Discharge Pipe Temperature Control Used as a measure of the compressor’s internal temperature. Compressor frequency is control to keep this temperature from going up further when it rises above a certain level. Discharge temperature Stop zone 110°C Drop zone 102°C...

  • Page 28: Overall Current Control

    Function & Control 2.20 Overall Current Control To monitor the overall current and to restrict the compressor upper limit rotation in order to prevent circuit breakers from exceeding the rated capacity. Detected during compressor running. Current (A) Stop zone Frequency reduce zone Frequency remain zone...

  • Page 29: Service Diagnosis

    Service Diagnosis 3.0 Service Diagnosis 3.1 Error Indication from Indoor • When any error occurs, indoor LED display will keep blinking (green light) • The blinking pattern does not indicate error details • The error details need to retrieve from handset in error code form.( Refer 3.1.1) LED blinks here 3.1.1 Error Code retrieved by wireless handset BRC52A61 Mode...

  • Page 30: Error Indication From Outdoor

    Service Diagnosis 3.1.2 Last State Error retrieved by wireless handset BRC52A61 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 31 Service Diagnosis When there is no error, compressor running frequency is displayed. When there is error, it fl ashes the error code as below: Normal operation Flashing Error Code In addition, 7 segment also can be use to retrieve unit operating condition such as running current, DC voltage, ambient temperature, indoor air temperature, etc.

  • Page 32: Error Code Description For Inverter

    Service Diagnosis Error code description for Inverter ARXN/RXN25/35L ERROR ARXN/RXN50/60L ARXN/RXN25/35M ERROR DESCRIPTION CODE RX50/60CG ARXN/RXN50/60M RXB50/60B 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 COMPRESSOR LOCK/START-UP...
  • Page 33 Service Diagnosis Description INDOOR PCB ABNORMALITY Supposed Cause 1. Faulty indoor PCB. 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 34 Service Diagnosis Description ANTIFREEZE PROTECTION OR HIGH PRESSURE CONTROL Supposed Cause 1. Indoor air fi lter, heat exchanger block due to dust accumulation. 2. Indoor air short circuit. 3. Indoor coil thermistor faulty. 4. Indoor PCB faulty. 5. Fan blower dirty. Troubleshooting Check indoor air flow.
  • Page 35 Service Diagnosis Description INDOOR FAN MOTOR ABNORMALITY Supposed Cause 1. Indoor fan motor winding short, or the motor lead wire broken. 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 36 Service Diagnosis Description INDOOR ROOM THERMISTOR ABNORMALITY Supposed Cause 1. Thermistor, connector faulty. 2. Indoor PCB faulty. Troubleshooting Check the thermistor connector condition. Correct the connection Normal? Check thermistor resistance value. # Refer thermistor resistance table.(Page 60, item 6.1) Replace thermistor Normal? Replace PCB.
  • Page 37 Service Diagnosis Description OUTDOOR PCB ABNORMALITY Supposed Cause 1. Micro Controller program run-away due to external factor such as Noise, Momentary voltage 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 38 Service Diagnosis E5 (ARXN/RXN_M,RXB50/60B,ARXN/RXN25/35L) Description COMPRESSOR OVERLOAD Supposed Cause 1. Refrigerant Shortage. 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. Disconnection of discharge pipe thermistor. 8.

  • Page 39: Troubleshooting

    Service Diagnosis E5 (ARXN/RXN50/60L) Description COMPRESSOR OVERLOAD Supposed Cause 1. Refrigerant Shortage. 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 40 Service Diagnosis Description COMPRESSOR LOCK/START-UP ABNORMALITY Supposed Cause 1. Compressor locked. 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 41 Service Diagnosis Description OUTDOOR FAN MOTOR LOCK Supposed Cause 1. Fan motor breakdown. 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 reconnect connector.
  • Page 42 Service Diagnosis Description AC INPUT OVER CURRENT Supposed Cause 1. Over current due to compressor failure. 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 43 Service Diagnosis Description 4 WAY VALVE ABNORMALITY Supposed Cause 1. Thermistor defective. 2. 4 way valve defective. 3. Outdoor PCB defective. 4. Insuffi cient 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 44 Service Diagnosis Description DISCHARGE PIPE OVERHEAT Supposed Cause 1. Refrigerant shortage. 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 Check the...
  • Page 45 Service Diagnosis Description HEAT EXCHANGER OVERHEAT Supposed Cause 1. The installation space is not large enough. 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 46 Service Diagnosis H0 (ARXN/RXN50/60L) Description COMPRESSOR SENSOR SYSTEM ABNORMAL Supposed Cause 1. Broken and disconnected harness. 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 47 Service Diagnosis H0 (ARXN/RXN25/35L/M) Description COMPRESSOR SENSOR SYSTEM ABNORMAL Supposed Cause 1. Broken and disconnected harness. 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 48 Service Diagnosis H6 (ARXN/RXN50/60L) Description POSITION SENSOR ABNORMAL (COMPRESSOR) Supposed Cause 1. Compressor relay cable disconnected. 2. Compressor itself defective. 3. Outdoor PCB defective. 4. Stop valve closed. 5. Input voltage out of specifi cation. Troubleshooting Check for short circuit. Replace the outdoor unit Normal? PCB, outdoor unit fan.
  • Page 49 Service Diagnosis H6 (RXN25/35L/M) Description POSITION SENSOR ABNORMAL (COMPRESSOR) Supposed Cause 1. Compressor relay cable disconnected. 2. Compressor itself defective. 3. Outdoor PCB defective. 4. Stop valve closed. 5. Input voltage out of specifi cation. Troubleshooting Check for short circuit. Replace the outdoor unit Normal? PCB, outdoor unit fan.
  • Page 50 Service Diagnosis H6 (ARXN/RXN50/60M) Description POSITION SENSOR ABNORMAL (COMPRESSOR) Supposed Cause 1. Compressor relay cable disconnected. 2. Compressor itself defective. 3. Outdoor PCB defective. 4. Stop valve closed. 5. Input voltage out of specifi cation. Troubleshooting Turn off the power. Check the power supply voltage.
  • Page 51 Service Diagnosis Description AC CURRENT SENSOR ABNORMALITY Supposed Cause 1. Internal wiring broken. 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 52 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 Supposed Cause 1. Disconnection of the connector for the thermistor. 2.
  • Page 53 Service Diagnosis Description ELECTRICAL BOX TEMPERATURE RISE (COMPRESSOR OFF) Supposed Cause 1. Fin temperature rise due to defective outdoor unit fan. 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 54 Service Diagnosis Description Heat sink overheat Supposed Cause 1. Fin temperature rise due to short circuit. 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 55 Service Diagnosis Description IPM ABNORMALITY Supposed Cause 1. Over current due to defective power transistor. 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 56 Service Diagnosis Description INSUFFICIENT GAS Supposed Cause 1. Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger,room or 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 57 Service Diagnosis Description DC VOLTAGE OUT OF RANGE Supposed Cause 1. Power supply voltage is not as specifi ed. 2. Defective DC voltage detection circuit. 3. Defective over-voltage detection circuit. 4. Defective PAM control part. 5. Disconnection of compressor harness 6.
  • Page 58 Service Diagnosis Description COMMUNICATION ABNORMALITY Supposed Cause 1. Faulty outdoor unit PCB. 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.
  • Page 59 Service Diagnosis Description INSTALLATION ABNORMALITY Supposed Cause 1. Wrong models interconnected. 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 60: Wiring Connection

    Wiring Connection 4.0 Wiring Connection Model: ATXN/FTXN 25/35L/M / ARXN/RXN 25/35L/M...
  • Page 61 Wiring Connection Model: ATXN/FTXN 50/60L / ARXN/RXN 50/60L...
  • Page 62 Wiring Connection Model: ATXN/FTXN 50/60M / ARXN/RXN 50/60M...

  • Page 63: Refrigerant Diagram

    Refrigerant Diagram 5.0 Refrigerant Diagram Model: ATXN/FTXN_L/M / FTXB_B / ARXN/RXN_L/M / RXB_B COOLING OPERATION TING OPERATION PIPING 3 WAY VALVE MUFFLER DISCHARGE PIPE THERMISTOR ACCUMULATOR COMPRESSOR ELECTRONIC PIPING EXPANSION VALVE LIQUID STRAINER 2 WAY STRAINER VALVE INDOOR UNIT OUTDOOR UNIT...

  • Page 64: Appendix A

    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. ARXN/RXN25/35L/M, ARXN/RXN50/60L,RX50CG ARXN/RXN50/60M Indoor Wall Mounted 10KΩ...
  • Page 65 Appendix A t°C Rmin (kΩ) Rnom (kΩ) Rmax (kΩ) t°C Rmin (kΩ) Rnom (kΩ) Rmax (kΩ) 1.30E+01 1.32E+01 1.33E+01 2.25E+00 2.31E+00 2.37E+00 1.25E+01 1.27E+01 1.28E+01 2.19E+00 2.24E+00 2.30E+00 1.20E+01 1.22E+01 1.23E+01 2.12E+00 2.17E+00 2.23E+00 1.16E+01 1.17E+01 1.18E+01 2.06E+00 2.11E+00 2.17E+00 1.11E+01 1.12E+01 1.14E+01...
  • Page 66 Appendix A 6.3 Four way valve performance checking procedures 6.3.1 ARXN/RXN25/35L/M Turn power off and then on again. *Four way valve coil Start heating operation. continuity S80 voltage at 180-280V with Replace outdoor PCB. compressor on? *Refer Figure 1 below. Disconnect four way valve coil from connector and check the continuity.
  • Page 67 Appendix A 6.3.2 RXN50/60M, RXB5060B Turn power off and then on again. *Four way valve coil Start heating operation. Cooling/Dry: No continuity Heating: Continuity 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 68 Appendix A 6.5 Inverter analyzer check If an abnormal stop occurs due to compressor start up failure or over current output when using an Inverter unit, it is diffi cult to judge whether the stop is caused by compressor failure or some other failure (main PCB, power module and etc.).
  • Page 69 Appendix A Direction of crimp This size is shortened by the crimp. FASTON terminal 6.6 Rotation pulse check on outdoor unit PCB 6.6.1 Turning speed pulse input on outdoor unit PCB check for ARXN/RXN25/35MV1B9 a. Make sure control voltage of DC15V is being applied. b.

  • Page 70: Installation Condition Check

    Appendix A 6.7 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 71 Appendix A 6.9 Diode bridge short circuit check procedures 6.9.1 Power transistor check for ARXN/RXN25/35L/M Check to make sure that the voltage between the terminal of Power transistor (+) and (-) is approx. 0 volt before checking power transistor. <Measuring method> Disconnect the compressor harness connector from the outdoor unit PCB.
  • Page 72 Appendix A 6.10 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). •...
  • Page 73 Product manufactured in an ISO certifi ed facility. This document contains the most current information as of this orienting. For the most up to date product information, please go to www.daikin-oyl.com.my...

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