Hokkaido 4 Series Service Manual

R32 refrigerant wall type air conditioners

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R32

Refrigerant

Wall Type

Air Conditioners

SERVICE MANUAL

Heat Pump Top Class Models with DC Fan Motor

1 Phase, 220-240V, 50/60Hz Power Supply

Series 4 Models:

HKEU 264 ZAL

HCNI 264 ZA

HKEU 354 ZAL

HCNI 354 ZA

[ Release 1.1 ]

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Summary of Contents for Hokkaido 4 Series

Page 1 Refrigerant Wall Type Air Conditioners SERVICE MANUAL [ Release 1.1 ] Heat Pump Top Class Models with DC Fan Motor 1 Phase, 220-240V, 50/60Hz Power Supply Series 4 Models: HKEU 354 ZAL HKEU 264 ZAL HCNI 354 ZA HCNI 264 ZA...
Page 2: Table Of Contents
Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC Table of Contents 1. PRODUCT DETAILS ..........................1 2. MODEL REFERENCE ......................... 3 3. DIMENSIONS ............................. 4 4. ELECTRICAL WIRING DIAGRAMS ....................6 5. OPERATION MODES AND FUNCTIONS................... 8 6. TROUBLESHOOTING ........................14 APPENDIX ............................
Page 3: Product Details
Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 1. PRODUCT DETAILS RESIDENTIAL R32 TOP CLASS DC INVERTER Wall Refrigerant Cold currents 24H timer leak detection prevention This function allows users to select Active only in cooling mode, it allows Through this function in heating delayed air conditioner on and/or to identify compressor malfunctions...
Page 4 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC RESIDENTIAL R32 Main features Models available in 2 power sizes 2.64 ~ 3.52 kW. Seasonal energy efficiency class in cooling/heating mode: A+++/A++ (2.64 kW); A++/A++ (3.52 kW). TOP CLASS DC INVERTER SEER/SCOP values 8.5/4.6 (2.64 kW).
Page 5: Model Reference
Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 2. MODEL REFERENCE Refer to the following table to determine the speciﬁc indoor and outdoor unit model number of your pur chased equip- ment. Indoor Unit Model Outdoor Unit Model Capacity (Btu/h) Power Supply 220-240V, 50Hz,...
Page 6: Dimensions
Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 3. DIMENSIONS 3.1 Indoor Units Models HKEU 264 ZAL, HKEU 354 ZAL Models W (mm) D (mm) H (mm) HKEU 264 ZAL HKEU 354 ZAL - 4 -...
Page 7 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 3.2 Outdoor Units Models HCNI 264 ZA, HCNI 354 ZA Unit: mm - 5 -...
Page 8: Electrical Wiring Diagrams
Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 4. ELECTRICAL WIRING DIAGRAMS 4.1 Indoor Units Models HKEU 264 ZAL, HKEU 354 ZAL Abbreviation Paraphrase Ground Wire Positive and Negative Ion Generator Capacitor Electronic Dust Collector PLASMA LIVE NEUTRAL Heater The Electric Heating Belt of Indoor Unit Indoor Room Temperature...
Page 9 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 4.2 Outdoor Units Models HCNI 264 ZA, HCNI 354 ZA Abbreviation Paraphrase Gas Valve Assembly/4-WAY VALVE 4-WAY Alternating Current (AC) FAN AC-FAN DC-FAN Direct Current (DC) FAN AC Current Detector COMP Compressor Low Pressure Switch...
Page 10: Operation Modes And Functions
Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 5. OPERATION MODES AND FUNCTIONS 5.1 Abbreviation Temperature values abbreviations: Refrigerant leakage detection Element Abbreviation This function is active only when cooling mode is selec- Indoor room temperature ted. It will detect if the compressor is being damaged by refrigerant leakage or by compressor overload.
Page 11 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 5.3 Digital Display 5.5 Cooling Mode 5.5.1 Compressor Control Unit display functions: ∆T is the programmed parameter of temperature compen- sation. • When T1-Ts < ∆T-2°C, the compressor ceases opera- tion.
Page 12 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 5.6.2 Indoor Fan Control 5.7 Auto-mode • When the compressor is on, the indoor fan can be set to • This mode can be selected with the remote controller． high/medium/low/auto. •...
Page 13 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 5.10 Auto-Restart function 5.14 Self Clean (Optional) • The indoor unit has an auto-restart module that allows • If you press “Self Clean” when the unit is in cooling or the unit to restart automatically.
Page 14 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC Meaning Additional Notes Displayed Code Explanation Displayed value Room temp. 1. All displayed temperatures use actual values. Indoor coil temp. 2. All temperatures are di- -1F,-1E,-1d,-1c,- -25,-24,-23,-22, splayed in °C regardless of 1b,-1A -21,-20 Outdoor coil temp.
Page 15 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC Displayed Code Explanation Displayed Value Meaning Additional Notes 0-FF 2-28 Reserved 5-20 5-25 - 13 -...
Page 16: Troubleshooting
Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6. TROUBLESHOOTING 6.1 Safety Caution WARNING Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting. • For other models, connect discharge resistance (approx. 100Ω 40W) or a soldering iron plug between the positi- ve and negative terminals of the electrolytic capacitor.
Page 17 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6.2 General Troubleshooting 6.2.1 Error Display (Indoor Unit) When the indoor unit encounters a recognized error, the indicator light (Operation Lamp) will ﬂash in a correspon- ding series, the timer indicator (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 18 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6.3 Error Diagnosis and Troubleshooting Without Error Code WARNING Be sure to turn off unit before any maintenance to prevent damage or injury. 6.3.1 Remote maintenance SUGGESTION: When troubles occur, please check the following points with Customers before ﬁeld maintenance. Problem Unit will not start.
Page 19 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 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 Unit is on but the wind is not cold (hot) Unit runs, but shortly stops The unit starts up and stops frequently...
Page 20 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 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) Unit runs, but shortly stops The unit starts up and stops frequently...
Page 21 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6.3.2 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. Unit runs, but it shortly stops.
Page 22 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 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 Condenser (Outdoor) fan will not start Unit runs, but shortly stops Compressor short-cycles due to overload...
Page 23 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC Refrigerant Circuit Others - 21 -...
Page 24 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6.4 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. You can ﬁnd the parts to replace by error code in the following table.
Page 25 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6.5 Troubleshooting by Error Code 6.5.1 Common Check Procedures 6.5.1.1 Temperature Sensor Check Disconnect the temperature sensor from PCB, measure the resistance value with a tester. Temperature Sensors: Room temp. (T1) sensor. Indoor coil temp.
Page 26 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6.5.1.3 IPM Continuity Check Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and U, V, W, N; U, V, W and N. Normal Normal Digital tester...
Page 27 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6.5.2 E0 / F4 (EEPROM parameter error) Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip. Recommended parts to prepare: • Indoor PCB • Outdoor PCB Troubleshooting and repair: Shut off the power supply and turn it on 2 minutes later.
Page 28 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6.5.3 E1 (Indoor and outdoor unit communication error) Description: The indoor unit has not received feedback from the outdoor unit for 110 seconds, 4 consecuti- ve times. Recommended parts to prepare: •...
Page 29 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC Remarks: • Use a multimeter to test the DC voltage between 2 port and 3 port of outdoor unit. The red pin of multimeter connects with 2 port while the black pin is for 3 port. •...
Page 30 LED will display the failure (E3). For 18k & 24k models (i.e. not for these Hokkaido models), when the outdoor fan speed registers below 150RPM or over 1500RPM for an extended period of time, the unit will stop and the LED will display the failure (F5).
Page 31 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 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 connec- tor.
Page 32 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6.5.5 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 will display the failure. Recommended parts to check or to prepare: •...
Page 33 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6.5.6 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 - 2°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 34 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6.5.7 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: • Power supply problems •...
Page 35 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6.5.8 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. Recommended parts to check or to prepare: •...
Page 36 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6.5.9 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 37 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6.5.10 P2 (High temperature protection of IPM module diagnosis and solution) Description: If the temperature of IPM module is higher than setting value, the LED displays this failure code. Recommended parts to prepare or to check: •...
Page 38 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC 6.5.11 P4 (Inverter compressor drive error diagnosis and solution) Description: An abnormal inverter compressor drive is detected by a special detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on. Recommended parts to prepare ot to check: •...
Page 39: Appendix
Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC APPENDIX i) Temperature Sensor Resistance Value Table for T1, T2, T3 and T4 (°C – kΩ) °C °F kΩ °C °F kΩ °C °F kΩ °C °F kΩ 115.266 12.6431 2.35774 0.62973 108.146...
Page 40 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC ii) Temperature Sensor Resistance Value Table for TP (°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...
Page 41 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC iii) Pressure On Service Port (R32) Cooling chart: °F(°C) 0(-17) 5(-15) 95 (35) (9.44) (7.22) (23.89) (29.44) (40.56) (46.11) (48.89) 70/59 10.3 10.8 75/63 10.9 11.4 80/67 11.4 12.1 90/73 10.7 10.5 10.2...
Page 42 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC Heating chart: 57/53 47/43 37/33 27/23 17/13 (-8.33/ -17/-18 °F(°C) 0/-2(-17/-19) (13.89/11.67) (8.33/6.11) (2.78/0.56) (-2.78/-5) -10.56) (-27/-28) 30.9 29.1 25.8 23.3 21.2 18.9 16.8 33.2 30.6 27.1 25.9 23.8 20.9 19.4 34.5 32.1...
Page 43 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC Notes Notes-1...
Page 44 Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC Notes Notes-2...
Page 45 Series 4 Models: “Wall” Top Class 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.

This manual is also suitable for:

Hkeu 264 zal Hcni 264 za Hkeu 354 zal Hcni 354 za