Hokkaido V-Design Series Service Manual
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Hokkaido V-Design Series Service Manual

R32 refrigerant air conditioners; heat pump “wall” type dc inverter models 1 phase, 220-240v, 50hz power supply
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R32
Refrigerant
Air Conditioners
Service Manual
Heat Pump "Wall" Type DC Inverter Models
1 Phase, 220-240V, 50Hz Power Supply
V-Design Series:
„
HKEU (262, 352) ZAL-B
HCNI (262, 352) ZA
[ Release 1.0 ]
(optional)

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Summary of Contents for Hokkaido V-Design Series

  • Page 1 Refrigerant Air Conditioners Service Manual [ Release 1.0 ] Heat Pump “Wall” Type DC Inverter Models 1 Phase, 220-240V, 50Hz Power Supply V-Design Series: „ HKEU (262, 352) ZAL-B HCNI (262, 352) ZA (optional)

  • Page 2: Table Of Contents

    V-Design Series: “Wall” Type R32 AC: Table of Contents Table of Contents SAFETY PRECAUTIONS ............................ I 1. SPECIFICATIONS ............................[1]-1 1.1 PRODUCT OVERVIEW ........................[1]-1 1.2 TECHNICAL DATA TABLES ......................[1]-2 1.3 PIPE LENGTH AND DROP HEIGHT ....................[1]-3 1.4 ELECTRICAL WIRING DIAGRAMS ....................[1]-4 2.

  • Page 3: Safety Precautions

    V-Design Series “Wall” Type R32 AC: Safety Precautions SAFETY PRECAUTIONS 1. Precautions To prevent personal injury, or property or unit damage, adhere CAUTION to all precautionary measures and instructions outlined in this Manual. Before servicing a unit, refer to this Service Manual •...
  • Page 4 V-Design Series “Wall” Type R32 AC: Safety Precautions 2. Information about servicing (for flammable refrigerants) 2.1 Checks to the area 2.7 Ventilated area • Prior to beginning work on systems containing flam- Ensure that the area is in the open or that it is adequately •...
  • Page 5 V-Design Series “Wall” Type R32 AC: Safety Precautions 2.10 Repairs to sealed components 2.14 Leak detection methods The following leak detection methods are deemed ac- • During repairs to sealed components, all electrical sup- • ceptable for systems containing flammable refrigerants.
  • Page 6 V-Design Series “Wall” Type R32 AC: Safety Precautions 2.16 Charging procedures • When the cylinders have been filled correctly and the • In addition to conventional charging procedures, the process is completed, make sure that the cylinders and following requirements shall be followed: the equipment are removed from site promptly and all •...

  • Page 7: Specifications

    V-Design Series “Wall” Type R32 AC: 1. Specifications 1. SPECIFICATIONS 1.1 PRODUCT OVERVIEW RESIDENTIAL R32 V-DESIGN DC INVERTER Clean air, design, high performance Turbo function High density filter Light effects Storing air flow louvre position In both cooling and These removed dust...

  • Page 8: Technical Data Tables

    V-Design Series “Wall” Type R32 AC: 1. Specifications 1.2 TECHNICAL DATA TABLES RESIDENTIAL R32 Characteristics 2.64~3.52 kW | 2 available power levels V-DESIGN DC INVERTER A++/A+ | Seasonal energy efficiency class in cooling/ heating mode Wall HKEU 262-352 ZAL-B Dark silver 6.7/4.0...

  • Page 9: Pipe Length And Drop Height

    V-Design Series “Wall” Type R32 AC: 1. Specifications 1.3 PIPE LENGTH AND DROP HEIGHT The length and elevation of connection pipe are shown in the table below. If the pipe length exceeds max. pipe length corresponding to refrigerant precharge, additional refrigerant (R32) should be charged to ensure nominal cooling/heating capacity and prevent any damages to the air conditioner.

  • Page 10: Electrical Wiring Diagrams

    V-Design Series “Wall” Type R32 AC: 1. Specifications 1.4 ELECTRICAL WIRING DIAGRAMS „ Indoor Units: HKEU (262, 352) ZAL-B Models Louver Motor Vertical Motor [1]-4...
  • Page 11 V-Design Series “Wall” Type R32 AC: 1. Specifications „ Indoor Units Abbreviations: Abbreviation Explanation Yellow-Green Conductor Positive and Negative Ion Generator Capacitor PLASMA Electronic Dust Collector LIVE NEUTRAL HEATER The Electric Heating Belt of Indoor Unit Indoor Room Temperature Sensor...
  • Page 12 V-Design Series “Wall” Type R32 AC: 1. Specifications „ Outdoor Units: HCNI (262, 352) ZA Models 16022000019533 Yellow or Black Blue Yellow/ Yellow/ Green Green Yellow/ Green W 1(L) 2(N) S Power Supply CN 1A 1Ph, 220-240V, 50 Hz to Indoor Unit...
  • Page 13 V-Design Series “Wall” Type R32 AC: 1. Specifications „ Outdoor Units Abbreviations: Abbreviation Explanation 4-WAY Gas Valve Assembly / 4-WAY VALVE AC-FAN Alternating Current FAN DC-FAN Direct Currente FAN AC Current Detector COMP Compressor Coil Temperature of Condenser Outdoor Ambient Temperature...

  • Page 14: Product Features

    V-Design Series “Wall” Type R32 AC: 2. Product Features 2. PRODUCT FEATURES 2.1 DISPLAY FUNCTION „ Unit display functions: Display Function Temperature Set temperature value Room temperature Temperature (Fan and Drying mode) Activation of Timer ON, Fresh, Swing, Turbo, or Silent...

  • Page 15: Safety Features

    V-Design Series “Wall” Type R32 AC: 2. Product Features 2.2 SAFETY FEATURES „Compressor 3-minute delay at restart Compressor functions are delayed for up to 1 minute upon the first startup of the unit, and are delayed for up to 3 minutes upon subsequent unit restarts.

  • Page 16: Basic Functions

    V-Design Series “Wall” Type R32 AC: 2. Product Features 2.3 BASIC FUNCTIONS 2.3.1 Table Cooling Mode & Heating Mode Heating Mode Auto Mode Outdoor Fan Control Defrosting Mode Case 1: Compressor Case 2: T3, A = 2°C Case 2: Case 1: T3 and T4,...
  • Page 17 V-Design Series “Wall” Type R32 AC: 2. Product Features 2.3.2 Abbreviation Unit element abbreviations: • The auto fan acts as below rules: Abbreviation Element T1-Td Indoor room temperature. Coil temperature of evaporator. Coil temperature of condenser. Outdoor ambient temperature. Set temperature.
  • Page 18 V-Design Series “Wall” Type R32 AC: 2. Product Features • If any one of the following conditions is satisfied, defrosting T1 ≥ 19°C TE1 = 0 ends and the machine switches to normal heating mode: 15°C ≤ T1 ≤ 18°C •...
  • Page 19 V-Design Series “Wall” Type R32 AC: 2. Product Features 2.3.11 Refrigerant Leakage Detection • Forced cooling mode: The compressor and outdoor fan continue to run and the With this new technology, the display area will show “EC” indoor fan runs at breeze speed. After running for 30 minutes, when the outdoor unit detects refrigerant leakage.

  • Page 20: Optional Functions

    V-Design Series “Wall” Type R32 AC: 2. Product Features 2.4 OPTIONAL FUNCTIONS 2.4.1 8°C Heating In heating mode, the temperature can be set to as low as 8°C, preventing the indoor area from freezing if unoccupied during severe cold weather.

  • Page 21: Maintenance

    V-Design Series “Wall” Type R32 AC: 3. Maintenance 3. MAINTENANCE 3.1 FIRST TIME INSTALLATION CHECK „ Air and moisture trapped in the refrigerant system affects the performance of the air conditioner by: • Increasing pressure in the system. • Increasing the operating current.
  • Page 22 V-Design Series “Wall” Type R32 AC: 3. Maintenance „ Air purging with vacuum pump: (Indoor unit) (Outdoor unit) (Liquid side) Two-way valve Close (Gas side) Three-way valve Gauge manifold Close Compound meter Pressure Pressu gauge -0.1MPa Handle “Lo” Handle “Hi”...

  • Page 23: Refrigerant Recharge

    V-Design Series “Wall” Type R32 AC: 3. Maintenance 3.2 REFRIGERANT RECHARGE „ Adding the refrigerant if the piping length exceeds the chargeless pipe length: (Liquid side) (Indoor unit) (Outdoor unit) 2-way valve Open (Gas side) Check valve 3-way valve Open...

  • Page 24: Re-Installation

    V-Design Series “Wall” Type R32 AC: 3. Maintenance 3.3 RE-INSTALLATION 3.3.1 Indoor Unit „ Collecting the refrigerant into the outdoor unit: (Liquid side) (Indoor unit) (Outdoor unit) 2-way valve Open (Gas side) 3-way valve Close Open Close Procedure: 1. Confirm that the 2-way and 3-way valves are opened.
  • Page 25 V-Design Series “Wall” Type R32 AC: 3. Maintenance „ Air purging with vacuum pump: (Indoor unit) (Outdoor unit) (Liquid side) Two-way valve Close (Gas side) Three-way valve Gauge manifold Close Compound meter Pressure Pressu gauge -0.1MPa Handle “Lo” Handle “Hi”...
  • Page 26 V-Design Series “Wall” Type R32 AC: 3. Maintenance 3.3.2 Outdoor Unit „ Evacuation for the whole system: (Liquid side) (Indoor unit) (Outdoor unit) 2-way valve Open (Gas side) 3-way valve OPEN Open Vacuum pump CLOSE Procedure: 1. Confirm that the 2-way and 3-way valves are opened.
  • Page 27 V-Design Series “Wall” Type R32 AC: 3. Maintenance „ Refrigerant charging: (Indoor unit) (Liquid side) (Outdoor unit) 2-way valve Open (Gas side) 3-way valve Check valve Open OPEN CLOSE Temperature m A A sensor Electronic scale Procedure: 1. Close both 2-way and 3-way valves.

  • Page 28: Indoor Units Disassembly

    V-Design Series “Wall” Type R32 AC: 4. Indoor Units Disassembly 4. INDOOR UNITS DISASSEMBLY 4.1 INDOOR UNITS DIMENSIONS „ Models HKEU (262, 352) ZAL-B Models W (mm) D1 (mm) D2 (mm) H (mm) HKEU 262 ZAL-B HKEU 352 ZAL-B [4]-1...

  • Page 29: Disassembling The Indoor Unit

    V-Design Series “Wall” Type R32 AC: 4. Indoor Units Disassembly 4.2 DISASSEMBLING THE INDOOR UNIT 4.2.1 Front Panel Procedure Illustration 1) Press down the panel buttons on the both sides of the front panel and lift it. (see CJ_AB_INV_001.) Front Panel...
  • Page 30 V-Design Series “Wall” Type R32 AC: 4. Indoor Units Disassembly Procedure Illustration 3) Open the horizontal louver and pull the hook outward to open it. (see CJ_VP_INV_003.) Hook CJ_VP_INV_003 4) Bend the horizontal louver lightly by both hands to loosen the hooks, then remove the horizontal louver.
  • Page 31 V-Design Series “Wall” Type R32 AC: 4. Indoor Units Disassembly Procedure Illustration 5) Pry the cover of electrical equipment by a screw driver, and then remove the cover of electronic control box. (see CJ_VP_INV_005.) CJ_VP_INV_005 6) Disconnect the connector for display board.
  • Page 32 V-Design Series “Wall” Type R32 AC: 4. Indoor Units Disassembly Procedure Illustration 8) Rip the mandril of panel from the side of front panel and take it down. (see CJ_VP_INV_007.) Mandril of Panel CJ_VP_INV_007 9) Slid the front panel side to side to release each axis.
  • Page 33 V-Design Series “Wall” Type R32 AC: 4. Indoor Units Disassembly Procedure Illustration 11) Remove the 4 screws on the panel fra- mework. (see CJ_VP_INV_010.) 12) Open the cover for screw and then relea- se the 1 screw. (see CJ_VP_INV_010.) Cover CJ_VP_INV_010 13) Release the 8 hooks in the back.
  • Page 34 V-Design Series “Wall” Type R32 AC: 4. Indoor Units Disassembly 4.2.2 Electrical parts (antistatic gloves must be worn) Note: Remove the front panel (refer to 4.2.1 Front panel) before disassembling electrical parts. Procedure Illustration 1) Release the 2 screws on the cover of elec- tronic control box and remove them.
  • Page 35 V-Design Series “Wall” Type R32 AC: 4. Indoor Units Disassembly Procedure Illustration 3) Remove the fixed screw for electronic con- Step motor wire trol box. (see CJ_VP_INV_015.) 4) Disconnect the connector for fan motor and the connector for step motor.
  • Page 36 V-Design Series “Wall” Type R32 AC: 4. Indoor Units Disassembly Procedure Illustration 7) The connector of each port is indicated in right image. (see CJ_VP_INV_018.) CJ_VP_INV_018 Note: This section is for reference only. Actual unit appearance may vary. [4]-9...
  • Page 37 V-Design Series “Wall” Type R32 AC: 4. Indoor Units Disassembly 4.2.3 Evaporator Note: Remove the front panel and electrical parts (refer to 4.2.1. Front panel and 4.2.2 Electrical parts) before disassem- bling evaporator. Procedure Illustration 1) Disassemble the pipe holder located at the rear of the unit.
  • Page 38 V-Design Series “Wall” Type R32 AC: 4. Indoor Units Disassembly Procedure Illustration 3) Remove the screw on the evaporator lo- cated at the fixed plate. (see CJ_VP_INV_021.) 4) Release the hook on the evaporator. Screw (see CJ_VP_INV_021.) Hook CJ_VP_INV_021 5) Pull out the evaporator.
  • Page 39 V-Design Series “Wall” Type R32 AC: 4. Indoor Units Disassembly 4.2.4 Fan motor and fan Note: Remove the front panel, electrical parts and evaporator (refer to 4.2.1 Front panel, 4.2.2 Electrical parts, and 4.2.3 Evaporator), before disassembling fan motor and fan.
  • Page 40 V-Design Series “Wall” Type R32 AC: 4. Indoor Units Disassembly Procedure Illustration 3) Take apart the fan motor cover. (see CJ_VP_INV_025.) Fan Motor Cover CJ_VP_INV_025 4) Remove the bearing sleeve. (see CJ_VP_INV_026.) CJ_VP_INV_026 5) Remove the fixing screw. (see CJ_VP_INV_027.) 6) Pull out the fan motor and fan assembly from the side.
  • Page 41 V-Design Series “Wall” Type R32 AC: 4. Indoor Units Disassembly 4.2.5 Step motor Note: Remove the front panel and electrical parts (refer to 4.2.1 Front panel, 4.2.2 Electrical parts) before disassembling step motor. Procedure Illustration 1) Remove the 2 screws, then remove the stepping motor.
  • Page 42 V-Design Series “Wall” Type R32 AC: 4. Indoor Units Disassembly 4.2.6 Drain Hose Procedure Illustration 1) Rotate the fixed wire clockwise as indica- ted in right image. (see CJ_VP_INV_029.) CJ_VP_INV_029 2) Pull up the drain hose to remove it. (see CJ_VP_INV_030.).

  • Page 43: Outdoor Units Disassembly

    V-Design Series “Wall” Type R32 AC: 5. Outdoor Units Disassembly 5. OUTDOOR UNITS DISASSEMBLY 5.1 OUTDOOR UNITS DIMENSIONS „ Models HCNI (262, 352) ZA Unit: mm [5]-1...

  • Page 44: Disassembling The Outdoor Unit

    V-Design Series “Wall” Type R32 AC: 5. Outdoor Units Disassembly 5.2 DISASSEMBLING THE OUTDOOR UNIT 5.2.1 Panel Plate Procedure Illustration 1) Turn off the air conditioner and the power breaker. 2) Remove the screws of the big handle and Big Handle then remove the big handle (1 screw).
  • Page 45 V-Design Series “Wall” Type R32 AC: 5. Outdoor Units Disassembly Procedure Illustration 4) Remove the screws of the front panel and then remove the front panel (7 screws). (see CJ_BA30_003.) Front Panel CJ_BA30_003 5) Remove the screws of water collecting co- ver (1 screw).
  • Page 46 V-Design Series “Wall” Type R32 AC: 5. Outdoor Units Disassembly Procedure Illustration 6) Remove the screws of the rear netand then remove the rear net (2 screws) (for so- me models). (see CJ_BA30_005.) CJ_BA30_005 7) Remove the screws of the right panel and then remove the right panel (6 screws).
  • Page 47 V-Design Series “Wall” Type R32 AC: 5. Outdoor Units Disassembly 5.2.2 Electrical parts 5.2.2.1 Removing the PCB WARNING: Antistatic gloves must be worn when you disassemble the electronic box. Note: Remove the air outlet grille (refer to 5.2.1 Panel Plate) before disassembling electrical parts.
  • Page 48 V-Design Series “Wall” Type R32 AC: 5. Outdoor Units Disassembly 5.2.3 Fan Assembly Note: Remove the panel plate (refer to 5.2.1 Panel Plate) before disassembling fan. Procedure Illustration 1) Remove the nut securing the fan with a spanner. (see CJ_ODU_FAN_001.) 2) Remove the fan.
  • Page 49 V-Design Series “Wall” Type R32 AC: 5. Outdoor Units Disassembly 5.2.4 Fan Motor Note: Remove the panel plate and the connection of fan motor on PCB (refer to 5.2.1 Panel Plate and 5.2.2 Electrical parts) before disassembling fan motor. Procedure Illustration 3) Remove the fixing screws of the fan motor...
  • Page 50 V-Design Series “Wall” Type R32 AC: 5. Outdoor Units Disassembly 5.2.5 Sound blanket Note: Remove the panel plate (refer to 5.2.1 Panel Plate) before disassembling sound blanket. Procedure Illustration 1) Remove the sound blanket (side and top). (see CJ_ODU_BLANKET_001.) Sound Blanket (top)
  • Page 51 V-Design Series “Wall” Type R32 AC: 5. Outdoor Units Disassembly 5.2.6 Four-way valve WARNING: Evacuate the system and confirm that there is no refrigerant left in the system before removing the four-way valve and the compressor. For R32, you should evacuate the system with the vacuum pump, then flush the system with nitrogen (OFN) and repeat the two steps before heating up the brazed parts.
  • Page 52 V-Design Series “Wall” Type R32 AC: 5. Outdoor Units Disassembly 5.2.7 Compressor WARNING: Evacuate the system and confirm that there is no refrigerant left in the system before removing the four-way valve and the compressor. For R32, you should evacuate the system with the vacuum pump, then flush the system with nitrogen and repeat the two steps before heating up the brazed parts.
  • Page 53 V-Design Series “Wall” Type R32 AC: 5. Outdoor Units Disassembly Procedure Illustration 3) Remove the hex nuts and washers se- curing the compressor, located on the bottom plate. (see CJ_ODU_COMP_003.) CJ_ODU_COMP_003 4) Heat up the brazed parts and then remove the discharge pipe and the suction pipe.

  • Page 54: Troubleshooting

    V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6. TROUBLESHOOTING 6.1 SAFETY CAUTION WARNING Be sure to turn off all power supplies or disconnect all wires to avoid electric shock. While checking indoor/outdoor PCB, please equip yourself with antistatic gloves or wrist strap to avoid damage to the board.

  • Page 55: General Troubleshooting

    V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.2 GENERAL TROUBLESHOOTING 6.2.1 Error Display (Indoor Unit) When the Indoor Unit encounters a recognized error, the Operation Lamp will flash in a corresponding series, the Timer Lamp may turn ON or begin flashing, and an error code will be displayed. These error codes are described in the following table:...

  • Page 56: Complain Record Form

    V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.3 COMPLAIN RECORD FORM Complain Record Form Request No. : Date : Installation Date : Service Date : Customer Information Telephone No. Name Home Address Email Product Information Outdoor Unit Model Indoor Unit Model Serial No.
  • Page 57 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting Parameter Checking information by Remote controller Displaying code meaning Display value meaning Displaying code Display value Room temperature Indoor coil temperature Outdoor coil temperature Ambient temperature Outlet temperature of indoor coil Discharge temperature...

  • Page 58: Information Inquiry

    V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.4 INFORMATION INQUIRY • To enter information inquiry status, complete the following procedure within 10 seconds: 1) Press 3 times LED button on the IR Remote Control. 2) Press 3 times SWING button on the IR Remote Control.
  • Page 59 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting Meaning Additional Notes Displayed Code Explanation Displayed value Room temp. 1. All displayed temperatures use actual values. Indoor coil temp. 2. All temperatures are dis- -1F,-1E,-1d,-1c,- -25,-24,-23,-22, played in °C regardless of re-...
  • Page 60 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting Displayed Code Explanation Meaning Displayed Value Additional Notes 0-FF 2-28 Reserved 5-20 5-25 [6]-7...

  • Page 61: Error Diagnosis And Troubleshooting Without Error Code

    V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.5 ERROR DIAGNOSIS AND TROUBLESHOOTING WITHOUT ERROR CODE WARNING Be sure to turn off unit before any maintenance to prevent damage or injury. 6.5.1 Remote maintenance SUGGESTION: When troubles occur, please check the following points with customers before field maintenance.
  • Page 62 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 1.Remote Maintenance Electrical Circuit Refrigerant Circuit Possible causes of trouble Unit will not start The power switch is on but fans will not start The temperature on the display board cannot be set...
  • Page 63 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 1.Remote Maintenance Others Possible causes of trouble Unit will not start The power switch is on but fans will not start The temperature on the display board cannot be set Unit is on but the wind is not cold (hot)
  • Page 64 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.5.2 Field maintenance Problem Unit will not start. Compressor will not start, but fans run. Compressor and condenser (outdoor) fan will not start. Evaporator (indoor) fan will not start. Condenser (Outdoor) fan will not start.
  • Page 65 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting Electrical Circuit 2.Field Maintenance Possible causes of trouble Unit will not start Compressor will not start but fans run Compressor and condenser (outdoor) fan will not start Evaporator (indoor) fan will not start...
  • Page 66 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting Refrigerant Circuit Others [6]-13...

  • Page 67: Quick Maintenance By Error Code

    V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.6 QUICK MAINTENANCE BY ERROR CODE If you do not have the time to test whether specific parts are faulty, you can directly change the required parts according to the error code.

  • Page 68: Troubleshooting By Error Code

    V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.7 TROUBLESHOOTING BY ERROR CODE 6.7.1 E0 / F4 (EEPROM parameter error diagnosis and solution) Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip. Recommended parts to prepare: •...
  • Page 69 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.7.2 E1 (Indoor and Outdoor Unit communication error diagnosis and solution) Description: Indoor Unit can not communicate with Outdoor Unit. Recommended parts to prepare: • Indoor PCB • Outdoor PCB • Short-circuited component...
  • Page 70 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting Remarks: • Use a multimeter to test the DC voltage between 2 port (or S or L2 port) and 3 port (or N or S port) of outdoor unit. The Red pin of multimeter connects with 2 port (or S or L2 port), while the Black pin is for 3 port (or N or S port).
  • Page 71 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.7.3 E2 (Zero crossing detection error diagnosis and solution) Description: When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal. Recommended parts to check or to prepare: •...
  • Page 72 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.7.4 E3 / F5 (Fan speed is operating outside of the normal range diagnosis and solution) Description: When the indoor fan speed keeps too low speed or too high speed for a certain time, the unit will stop and the LED will display the failure.
  • Page 73 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting Index: 1. Indoor or Outdoor DC Fan Motor (control chip is in fan motor) Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector.
  • Page 74 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 3. Indoor AC Fan Motor Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the voltage of pin1 and pin2. If the value of the voltage is less than 100V (208~240V power supply), the PCB must have problems and needs to be replaced.
  • Page 75 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.7.5 E4 / E5 / F1 / F2 / F3 (Open circuit or short circuit of temperature sensor diagnosis and solution) Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure code.
  • Page 76 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.7.6 E7 / EH / 0b (Indoor PCB / Display board communication error diagnosis and solution) Description: Indoor PCB does not receive feedback from the display board. Recommended parts to check or to prepare: •...
  • Page 77 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.7.7 EC (Refrigerant Leakage Detection diagnosis and solution) Description: Define the evaporator coil temp. T2 of the compressor when it just starts running, as “Tcool”. In the beginning 8 minutes after the compressor starts up, if T2 < (Tcool - 1)°C does not keep for continuous 4 seconds and compressor running frequency higher than 50Hz does not keep for continuous 3 minutes, and this situation happens 3 times, the display area will show “EC”...
  • Page 78 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.7.8 F0 (Overload current protection diagnosis and solution) Description: An abnormal current rise is detected by checking the specified current detection circuit. Recommended parts to check or to prepare: • Outdoor PCB •...
  • Page 79 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.7.9 P0 (IPM malfunction or IGBT over-strong current protection diagnosis and solution) Description: When the voltage signal which the IPM sends to the compressor drive chip is abnormal, the display LED shows “P0” and the AC turns off.
  • Page 80 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.7.10 P1 (Over voltage or too low voltage protection diagnosis and solution) Description: Abnormal increases or decreases in voltage are detected by checking the specified voltage detection circuit. Recommended parts to prepare: •...
  • Page 81 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.7.11 P2 (High temperature protection of IPM module or High pressure protection diagnosis and solution) Description: If the temperature of IPM module is higher than a certain value, the LED displays this failure code.
  • Page 82 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting High pressure protection. Are the high pressure switch Connect high pressure switch and main control board wired and main control board. correctly? Is the high pressure protector broken? Method: Disconnect the plug.
  • Page 83 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.7.12 P4 (Inverter compressor drive error diagnosis and solution) Description: An abnormal inverter compressor drive is detected by a special detection circuit, including communi - cation signal detection, voltage detection, compressor rotation speed signal detection and so on.
  • Page 84 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.7.13 P6 (Low pressure protection) Description: Outdoor pressure switch cuts off the system because low pressure is lower than 0.13 MPa, the LED displays the failure code. Recommended parts to prepare or to check: •...
  • Page 85 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting Troubleshooting and repair: Low pressure protection. Are the low pressure protector Reconnect the low pressure pro- and main control board wired tector and main control board. correctly? Is the low pressure protector broken? Method: Disconnect the plug.

  • Page 86: Check Procedures

    V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.8 CHECK PROCEDURES 6.8.1 Temperature Sensor Check WARNING Be sure to turn off all power supplies or disconnect all wires to avoid electric shock. Operate after com- pressor and coil have returned to normal temperature to avoid any injuries.
  • Page 87 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting Resistance Value Position Terminals: Blue - Red Terminals: Blue - Black 1.57Ω Terminals: Red - Black Note: The picture and the value are only for reference, actual condition and specific value may vary.
  • Page 88 V-Design Series “Wall” Type R32 AC: 6. Troubleshooting 6.8.3 IPM Continuity Check WARNING Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting. 1. Turn off outdoor unit and disconnect power supply.

  • Page 89: Appendix

    V-Design Series “Wall” Type R32 AC: 7. Appendix 7. APPENDIX 7.1 TEMPERATURE SENSOR RESISTANCE VALUE TABLES i) Temperature Sensors T1, T2, T3 and T4 (°C – kΩ) °F kΩ °F kΩ °F kΩ °F kΩ °C °C °C °C 115.266 12.6431...
  • Page 90 V-Design Series “Wall” Type R32 AC: 7. Appendix ii) Temperature Sensor TP (for some units) (°C – kΩ) °F kΩ °F kΩ °F kΩ °F kΩ °C °C °C °C 542.7 68.66 13.59 3.702 511.9 65.62 13.11 3.595 62.73 12.65 3.492...

  • Page 91: Pressure On Service Port (R32 Refrigerant)

    V-Design Series “Wall” Type R32 AC: 7. Appendix 7.2 PRESSURE ON SERVICE PORT (R32 REFRIGERANT) „ Cooling chart: Outdoor (DB) Temp. (°C) -9.44 7.22 23.89 29.44 40.56 46.11 48.89 Indoor (DB/WB) 21.11/15 10.3 10.8 23.89/17.22 10.9 11.4 26.67/19.44 11.4 12.1 32.22/22.78...
  • Page 92 V-Design Series “Wall” Type R32 AC: 7. Appendix „ Heating chart: Outdoor (DB/WB) 2.78/0.56 -2.78/-5 -8.33/-10.56 -17/-19 13.89/11.67 8.33/6.11 -27/-28 Temp. (°C) Indoor (DB) 12.78 30.9 29.1 25.8 23.3 21.2 18.9 16.8 18.33 33.2 30.6 27.1 25.9 23.8 20.9 19.4 23.89...
  • Page 93 V-Design Series “Wall” Type R32 AC: 7. Appendix „ System Pressure Table (R32) Pressure Temperature Pressure Temperature °C °F °C °F 14.5 -51.909 -61.436 1850 18.5 268.25 28.425 83.165 21.75 -43.635 -46.543 1900 275.5 29.447 85.005 -37.323 -35.181 1950 19.5 282.75...
  • Page 94 V-Design Series “Wall” Type R32 AC: Notes Notes Notes-1...
  • Page 95 V-Design Series “Wall” Type R32 AC: Notes Notes Notes-2...
  • Page 96 V-Design Series: “Wall” Type DC Inverter R32 Refrigerant AC Due to on-going technological development of the products by the manufacturer, we reserve the right to vary the technical specifications at any time without notice.

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