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ComfortStar AHU3-DU Series Service Manual

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SPLIT AIR CONDITIONERS
Service Manual
ComfortSta
AHU3-DU/AHU3-M SERIES
IMPORTANT NOTE:
Read this manual carefully before operating your
new air conditioning unit. Make sue to save this
manual for future reference.
Please check the applicable models, technical data,
F-GAS(if any) and manufacturer information from the "Owner
Manual" in the packaging of the outdoor unit.
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Summary of Contents for ComfortStar AHU3-DU Series

  • Page 1 SPLIT AIR CONDITIONERS Service Manual ComfortSta ® AHU3-DU/AHU3-M SERIES IMPORTANT NOTE: Read this manual carefully before operating your new air conditioning unit. Make sue to save this manual for future reference. Please check the applicable models, technical data, F-GAS(if any) and manufacturer information from the "Owner Manual"...
  • Page 3 Table of Contents 1. Safety Precautions Precautions Information servicing Model Reference & External Appearance Model Reference External Appearance 3. Indoor Unit Feature Dimensional Drawings Part names Service Place Accessories Fan Performance Sound Pressure Levels Refrigerant System Diagram Electrical Characteristics Electrical Wiring Diagrams Installation Product Features 6.

  • Page 5: Safety Precautions

    Safety Precautions Contents Precautions ......................2 Information servicing(For flammable materials) ..........4...
  • Page 6 1. Precautions WARNINGS FOR PRODUCT INSTALLATION To prevent personal injury, or property or unit damage, • Turn off the air conditioner and disconnect the power adhere to all precautionary measures and instructions before performing any installation or repairs. Failure to do so can cause electric shock. outlined in this manual.
  • Page 7 2. Information servicing(For WARNING FOR USING FLAMMABLE REFRIGERANT flammable materials) 1. Installation (Space) - That the installation of pipe-work shall be kept to a Installation(where refrigerant pipes are minimum. allowed) - That pipe-work shall be protected from physical damage. - Any person who is involved with working on or - Where refrigerant pipes shall be compliance with breaking into a refrigerant circuit should hold a current national gas regulations.
  • Page 8 malfunctions, the indoor unit will display the error code b. The test pressure after removal of pressure source shall “FHCC”. be maintained for at least 1 h with no decrease of pressure indicated by the test gauge, with test gauge resolution not The refrigerant sensor can not be repaired and can only exceeding 5% of the test pressure.

  • Page 9: Detection Of Flammable Refrigerants

    General work area adequately and are not obstructed; • if an indirect refrigerating circuit is being used, the • All maintenance staff and others working in the local area secondary circuits shall be checked for the presence of shall be instructed on the nature of work being carried out. refrigerant;...

  • Page 10: Removal And Evacuation

    sensitivity may not be adequate, or may need re- take place. calibration. (Detection equipment shall be calibrated • The outlet for the vacuum pump shall not be close to any in a refrigerant-free area.) Ensure that the detector is potential ignition sources, and ventilation shall be available. not a potential source of ignition and is suitable for the refrigerant used.
  • Page 11 2.20 Unventilated areas g) Start the recovery machine and operate in accordance with instructions. - An unventilated area where the appliance using h) Do not overfill cylinders (no more than 80 % volume liquid FLAMMABLE REFRIGERANTS is installed shall be so charge) constructed that should any refrigerant leak, it will not i) Do not exceed the maximum working pressure of the cylinder,...
  • Page 12 Signs for similar appliances used in a work area are generally addressed by local regulations and give the minimum requirements for the provision of safety and/or health signs for a work location. All required signs are to be maintained and employers should ensure that employees receive suitable and sufficient instruction and training on the meaning of appropriate safety signs and the actions that need to be taken in connection with these signs.

  • Page 13: Model Reference

    Model Reference Contents Model Reference ....................2 External Appearance .....................2...

  • Page 14: External Appearance

    1. Model Reference Capacity Indoor Unit Model Power Supply (Btu/h) AHU3-18M AHU3-24M AHU3-30M AHU3-36M 1Phase, 208/230V~, 60Hz AHU3-36DU(I) AHU3-48DU(I) AHU3-60DU(I) 2. External Appearance Indoor Unit Air handler  Model Reference ...

  • Page 15: Table Of Contents

    Indoor Unit-Air Handler Contents Feature........................2 Dimensional Drawings ..................3 Part names And Functions ..................4 Service Place ......................5 Accessories ......................6 Fan Performance ....................7 Sound Pressure Levels ..................18 Refrigerant System Diagram ................21 Electrical Characteristics ..................22 Electrical Wiring Diagrams ..................22...

  • Page 16: Feature

    1. Feature Full Multi-position installation • This AHU is capable of upflow, downflow, horizontal left, or horizontal right configurations. Installation Convenience • It simplifies the airflow volume adjustment process and saves lots of installation efforts. The traditional adjustment method needs the installers to manually set the motor speed, according to the installation instruction and ducting design.

  • Page 17: Dimensional Drawings

    2. Dimensional Drawings 18k/24k 30k/36k 48k/60k Dimensions Model inch inch inch Model Height 1143 1245 1346 Model Width 17-1/2 24-1/2 Supply Air Opening Width 15-5/8 19-1/8 22-5/8 Return Air Opening Width 15-1/8 18-5/8 22-1/8 Model Depth Supply Air Opening Depth 10-1/4 10-1/4 10-1/4...

  • Page 18: Part Names And Functions

    3. Part names And Functions (1) Vertical Upflow Downflow (2) Horizontal Right Horizontal right (3) Horizontal Left Horizontal left Note: Vertical up and horizontal left installation does not need to change the direction of evaporator.  IDU-Air Handler 4 ...

  • Page 19: Service Place

    4. Service Place The distance between the mounted indoor unit should meet the specifications illustrated in the following diagram. Horizontal installations Minimum clearance of 1 in(25.4mm) all sides Flexible duct collar The outlet side pipe length 4.9ft/1.5m. The outlet side pipe length 4.9ft/1.5m. Vertical installations ...

  • Page 20: Accessories

    5. Accessories The air conditioning system comes with the following accessories. Use all of the installation parts and accessories to in- stall the air conditioner. Improper installation may result in water leakage, electrical shock and fire, or equipment failure. Name Shape Quantity Manual...

  • Page 21: Fan Performance

    6. Fan Performance Vertical, Horizontal Right, Horizontal Left Turbo 0.15 External sta�c pressure (in.w.c.) Use the remote controller 1.Indoor unit need to turn off for 5 minutes then power on(all of setting need to finish within 10 minutes) 2.Keep push for 7 seconds with ON/OFF and FAN SPEED together to get in Engineer mode 3.Choose channel 23(for cooling) and 25(for heating) with UP and Down button 4.After choose channel 23 or 25 then keep push ON/OFF for 2 seconds to select -41, -40,……, -1, 0, 1,2,3……19 20(reference the matrix list to identify the relative CFM)
  • Page 22 Vertical, Horizontal Right, Horizontal Left Turbo 0.15 External sta�c pressure (in.w.c.) Use the remote controller 1.Indoor unit need to turn off for 5 minutes then power on(all of setting need to finish within 10 minutes) 2.Keep push for 7 seconds with ON/OFF and FAN SPEED together to get in Engineer mode 3.Choose channel 23(for cooling) and 25(for heating) with UP and Down button 4.After choose channel 23 or 25 then keep push ON/OFF for 2 seconds to select -41, -40,……, -1, 0, 1,2,3……19 20(reference the matrix list to identify the relative CFM)
  • Page 23 Heating Default Turbo High Medium Heating Default -17~-41 Turbo High Medium Heating Default +14~+20 Turbo High Medium  IDU-Air Handler 9 ...
  • Page 24 Vertical, Horizontal Right, Horizontal Left 1200 1000 Turbo 0.1 0.15 0.2 External sta�c pressure (in.w.c.) Use the remote controller 1.Indoor unit need to turn off for 5 minutes then power on(all of setting need to finish within 10 minutes) 2.Keep push for 7 seconds with ON/OFF and FAN SPEED together to get in Engineer mode 3.Choose channel 23(for cooling) and 25(for heating) with UP and Down button 4.After choose channel 23 or 25 then keep push ON/OFF for 2 seconds to select -41, -40,……, -1, 0, 1,2,3……19 20(reference the matrix list to identify the relative CFM)
  • Page 25 Cooling Default +17~+20 Turbo 1071 1071 1071 1071 1071 1071 1071 1071 1071 1071 1071 High 1014 1034 1053 1053 1053 1053 1053 1053 1053 1053 1053 Medium 1006 1026 1035 1035 1035 1035 1035 1012 1018 Heating Default Turbo High Medium Heating...
  • Page 26 Vertical, Horizontal Right, Horizontal Left 1400 1200 1000 Turbo 0.15 External sta�c pressure (in.w.c.) Use the remote controller 1.Indoor unit need to turn off for 5 minutes then power on(all of setting need to finish within 10 minutes) 2.Keep push for 7 seconds with ON/OFF and FAN SPEED together to get in Engineer mode 3.Choose channel 23(for cooling) and 25(for heating) with UP and Down button 4.After choose channel 23 or 25 then keep push ON/OFF for 2 seconds to select -41, -40,……, -1, 0, 1,2,3……19 20(reference the matrix list to identify the relative CFM)
  • Page 27 Cooling Default Turbo 1188 High 1082 Medium Cooling Default -37~-41 Turbo 1188 1208 1228 1248 1268 1288 1288 1288 1288 1288 1288 1288 High 1082 1102 1122 1142 1162 1182 1202 1222 1242 1262 1271 1271 Medium 1011 1031 1051 1071 1091 1111...
  • Page 28 Vertical, Horizontal Right, Horizontal Left 2000 1800 1600 1400 1200 Turbo 1000 0.15 External sta�c pressure (in.w.c.) Use the remote controller 1.Indoor unit need to turn off for 5 minutes then power on(all of setting need to finish within 10 minutes) 2.Keep push for 7 seconds with ON/OFF and FAN SPEED together to get in Engineer mode 3.Choose channel 23(for cooling) and 25(for heating) with UP and Down button 4.After choose channel 23 or 25 then keep push ON/OFF for 2 seconds to select -41, -40,……, -1, 0, 1,2,3……19 20(reference the matrix list to...
  • Page 29 High 1471 1051 1031 1011 Medium 1282 1094 Cooling Default -40~-41 Turbo 1600 High 1471 Medium 1282 1094 Cooling Default Turbo 1600 1620 1640 1660 1680 1700 1720 1724 1724 1724 1724 High 1471 1491 1511 1531 1551 1571 1591 1611 1631 1651...
  • Page 30 Vertical, Horizontal Right, Horizontal Left 2000 1800 1600 1400 1200 Turbo 1000 0.15 External sta�c pressure (in.w.c.) Use the remote controller 1.Indoor unit need to turn off for 5 minutes then power on(all of setting need to finish within 10 minutes) 2.Keep push for 7 seconds with ON/OFF and FAN SPEED together to get in Engineer mode 3.Choose channel 23(for cooling) and 25(for heating) with UP and Down button 4.After choose channel 23 or 25 then keep push ON/OFF for 2 seconds to select -41, -40,……, -1, 0, 1,2,3……19 20(reference the matrix list to...
  • Page 31 High 1582 1162 1142 1122 1102 1082 1062 1042 1022 1002 Medium 1359 1135 Cooling Default -40~-41 Turbo 1806 1186 1166 1146 1126 1106 1086 1066 1046 1026 1006 High 1582 Medium 1359 1135 Cooling Default Turbo 1806 1826 1846 1866 1886 1906...

  • Page 32: Noise Criterion Curves

    7. Noise Criterion Curves 1m/3.28ft 2m/6.56ft 1.5m/4.92ft Horizontal installation Vertical installation (H= 0.5 × (height of unit+1)) Notes: -Sound measured at 1.5m/4.92ft(Horizontal installation) /1m/3.28ft(Vertical installation) away from the center of the unit. -Data is valid at free field condition -Data is valid at nominal operation condition -Reference acoustic pressure OdB = 20µPa -Sound level will vary depending on a range of factors such as the construction -(acoustic absorption coefficient) of particular room in which the equipment is installed.
  • Page 33 AHU3-18M AHU3-24M AHU3-30M AHU3-36M  IDU-Air Handler 19 ...
  • Page 34 AHU3-36DU(I) AHU3-48DU(I) AHU3-60DU(I)  IDU-Air Handler 20 ...

  • Page 35: Refrigerant System Diagram

    8. Refrigerant System Diagram  IDU-Air Handler 21 ...

  • Page 36: Electrical Characteristics

    9. Electrical Characteristics IDU Model 30k/36k Phase Power Frequency And Volt 208/230V,60Hz Minimum Circuit 9.75 Ampacity Max Fuse 10. Electrical Wiring Diagrams IDU Model IDU Wiring Diagram AHU3-18M 16023000014232 AHU3-24M AHU3-30M 16023000015672 AHU3-36M AHU3-36DU(I) 16023000015673 AHU3-48DU(I) AHU3-60DU(I) Abbreviation Paraphrase Yellow-Green Conductor FAN1 Indoor ECM Motor TO CCM Comm.Bus...
  • Page 40 10.1 Micro-Switch Introduce: A For ALARM terminal port CN33 1. Provide the terminal port to connect ALARM, but no voltage of the terminal port , the power from the ALARM system (not from the unit ) 2. Although design voltage can support higher voltage ,but we strongly ask you connect the power less than 24V, current less than 0.5A 3.
  • Page 41 B. For remote control (ON-OFF) terminal port CN2 and short connector of JR1 1. Remove the short connector of JR1 when you use ON-OFF function; 2. When remote switch off (OPEN); the unit would be off; 3. When remote switch on (CLOSE); the unit would be on; 4.
  • Page 42 10.2 Micro-Switch Introduce: S 1+ SW 8 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 A. Micro-switch S1 and dial-switch SW8 are for address setting when you want to control this unit by a central controller. Range: 00-63 Network address: The address silkscreen is NET address, which is composed of a 16-bit address rotary code S1 plus a two-digit DIP switch SW8 [Set during engineering installation, no network function does not need to be set]...
  • Page 43 C. Function DIP Switch Settings The 24V thermostat mode needs to refer to the following settings Dial code Function OFF(Default) Note Control Scenario 24V Tstat, S1+S2 SW1-2 Anti-cold blow protection option [Default] Yes Single cooling / heating and SW1-3 Cooling [Default] Cooling &...
  • Page 44 R stop output 24V when [Default] R keep output 24V refrigerant sensor fault or even when refrigerant sensor SW5-4 R output selection R454B refrigerant leakage be fault or R454B refrigerant detected leakage be detected Control Scenario Wired Controller S1+S2 SW1-2 Anti-cold blow protection option [Default] Yes Single cooling / heating and...
  • Page 45 Control Scenario Full 24V(Note: Control scenario 3 is not applicable for this unit.) SW1-2 Anti-cold blow protection option [Default] Yes Single cooling / heating and SW1-3 Cooling [Default] Cooling & Heating cooling options Fan speed of cooling mode when SW3-4 Turbo High 24V Thermostat is applied for.
  • Page 46 Wired controller S1+S2 Scenario 2 24V Thermostat S1+S2 Scenario 1 24V Thermostat 24V Thermostat Scenario 3...

  • Page 47: Installation

    Installation Contents Location Selection Indoor Unit Installation Connecting the Wire And Pipes Refrigerant Pipe Installation Engineering of Insulation Installation of Electric Auxiliary Heat Module(Only For Heat Function Models) Engineering of Electrical Wiring...

  • Page 48: Location Selection

    1. Location selection At least 18in(460mm) 1.1 Unit location selection can refer to installation manual. Place air handler so that heating  1.2 DO NOT install the unit in the following elements are at least 18in(460mm) above the floor for a garage installation. Failure to follow these locations: instructions can result in death, explosion, or fire.

  • Page 49: Install The Main Body

    Vertical installation At least 5in(127mm) Horizontal NOTICE: For horizontal installation, a secondary drain pan (not supplied) must be installed. Horizontal installation 24inch(min) Upflow Downflow 2.2 Install the main body The units can be installed in a vertical (down and up)and Horizontal(right and left) configuration.
  • Page 50 3.1 Please follow these steps to perform Vertical 3. Remove evaporator cover plate. down installation and Horizontal right installation: 1. Open the upper cover. 2. Open the cover of the electronic control box. Then remove the second 3. Connect the wire according to the wiring diagram. cover plate.
  • Page 51 48-60K model 7. Take out the evaporator and drain pan and rotate 180° (when your equipment need to be vertical downed configuration).. Refrigerant detection sensor 5. Unplug temperature sensors T1,T2,refrigerant detection sensor from the control board. T1: Room temperature sensor T2: Evaporator central sensor plug 8.Adjust the mounting parts position according to the direction of equipment.
  • Page 52 12. Use cable ties to fix the room temperature sensor as shown in the figure. cable ties Cut the foam gasket. 13. Reinstall evaporator cover plate. Remove knockouts as shown in the figure. Hook the wire into the buckle and go down from the wire slot.
  • Page 53 CAUTION FOR ALL PIPES INSTALLATION • Insulate all piping to prevent condensation, which could lead to water damage. • The drainpipe is used to drain water away from the unit. If the drainpipe is bent or installed incorrectly, water may leak and cause a water-level switch malfunction.

  • Page 54: Refrigerant Pipe Installation

    4. Refrigerant Pipe Installation Indoor unit/ Outdoor unit 4.1 Recommended copper pipe thickness Pipe diameter Thickness(inch/mm) (inch(mm)) Ø1/4 (Ø6.35) 0.024/0.6 Ø3/8 (Ø9.52) 0.028/0.7 6m/20ft (＜36000Btu/h unit) Ø1/2 (Ø12.7) 0.03/0.75 10m/32.8ft (≥36000Btu/h unit) Ø5/8 (Ø15.9) 0.03/0.75 Indoor unit/ Outdoor unit Ø3/4 (Ø19) 0.031/0.8 6m/20ft (＜36000Btu/h unit) 4.2 Maximum length and drop height...
  • Page 55 NOTE: MINIMUM BEND RADIUS Flare dimension A Pipe diameter (inch/mm) Flare shape Carefully bend the tubing in the middle according to the (inch(mm)) diagram below. Ø1/4 (Ø6.35) 0.33/8.4 0.34/8.7 DO NOT bend the tubing more than 90°or more than 3 times.

  • Page 56: Engineering Of Insulation

    5 . Engineering of Insulation may extrude out the air in the material to cause bad insulation and cause easy aging of the material. 5.1 Insulation of refrigerant pipe 5.2 Insulation of drainage pipe 1. Operational procedure of refrigerant pipe 1.

  • Page 57: Installation Of Electric Auxiliary Heat Module(Only For Heat Function Models)

    6. Installation Of Electric Auxiliary Heat Module(Only For Heat Function Models) NOTICE: Installation must be performed by an licensed contractor. Please make necessary precaution when performing the installation operation. Preparations for Installation Before installation, please confirm the electric auxiliary heat module and supplied accessories are complete and free of any damage.
  • Page 58 board. shell 7. Install the upper cover,and the silicone breaker cover. assembly hole This figure shows the top view perspective 8. After installing the electric auxiliary heat module, apply the circuit breaker label near the silicone breaker cover that was just applied. NOTE: The circuit breaker cannot be operated by user.
  • Page 59 Engineering of Electrical Wring 1. Highlights of electrical wiring installation • All field wiring construction should be finished by qualified electrician. • Air conditioning equipment should be grounded ac- cording to the local electrical regulations. • Current leakage protection switch should be in- stalled.

  • Page 60: Control Logic

    4. Control Logic Indoor unit Connector Connector Purpose 24V Power Connection Common 3.2 The fault warning Fan Control Alarm output: Low Cooling An alarm output(CN33) can be utilized if actions are Y/Y2 High Cooling required when a fault is present. This is a passive outlet Heating Reversing Valve port, so you will need to input a voltage signal.

  • Page 61: Product Features

    Product Features Contents 1. 24V Signal Chart ................... 2 2. Safety Features ..................... 3 3. Basic Functions ....................3 Abbreviation ......................3 Fan Mode ......................... 3 Cooling Mode ......................3 Heating Mode(Heat Pump Units) ................4 Auto Mode ....................... 4 Forced Operation Function ..................

  • Page 62: Signal Chart

    1. 24V Signal Chart Mode Priority Y/Y2 E/AUX Fan speed Display Cooling stage 1 Cooling stage 2 High Dehumidification 1 Dehumidification 2 Heat pump stage 1 Heat pump stage 2 High Heat pump stage 2 High Electric heater kit 1 Turbo Electric heater kit 2 Turbo...

  • Page 63: Safety Features

    2. Safety Features 1) In cooling mode, the indoor fan operates continuously. The fan speed can be set to low, medium, high, turbo Indoor fan delayed operation and auto. • When the unit starts, the indoor fan will operate after 2) Auto fan action in cooling mode: a period of setting time.

  • Page 64: Heating Mode(Heat Pump Units)

    • Off: Compressor stops. fan speed increases to high; • When T1-Tsc is lower than or equal to -3°C/-5°F, fan • Decrease: Decrease the running frequency to the lower speed increases to turbo. level per 1 minute. • Hold: Keep the current frequency. 3.4.2 Evaporator Coil Temperature Protection •...

  • Page 65: Forced Operation Function

    they do that in cooling mode. (to not higher than 30°C/86°F) every hour. After 2 hours, the temperature stops rising and the indoor • Low Room Temperature Protection fan is fixed at low speed. If the room temperature is lower than 10°C/50°F, the •...
  • Page 66 Troubleshooting Contents 1. Safety Caution ..................... 3 2. General Troubleshooting ................4 Error Display (Indoor Unit) ..................4 Error Display on Two Way Communication Wired Controller ........5 3. Engineering Mode ..................6 Information Inquiry ....................6 Advanced Function Setting ..................9 4.

  • Page 67: Troubleshooting

    Troubleshooting Contents PC 04(Inverter compressor drive error Diagnosis and Solution) ........30 6.10 PC 03(Pressure protection(low or high pressure) Diagnosis and Solution) ....31 6.11 PC 02(Compressor top (or IPM) temp. protection diagnosis and solution) ....34 6.12 PC 0L (Low ambient temperature protection) ............35 6.13 EH b3 (Communication malfunction between wire and master control) Diagnosis and Solution 6.14 EH bA(Communication malfunction between indoor unit and external fan module)/EH 3A(External fan DC bus voltage is too low protection)/ EH 3b(External fan DC bus voltage is too...

  • Page 68: Safety Caution

    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 oneself with antistatic gloves or wrist strap to avoid damage to the board. WARNING Electricity remains in capacitors even when the power supply is off.

  • Page 69: General Troubleshooting

    2. General Troubleshooting 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: Display Error Information...

  • Page 70: Error Display On Two Way Communication Wired Controller

    Refrigerant sensor is out of range and leakage is detected TS39 EH C2 Refrigerant sensor is out of range TS38 EH C3 IDU & ODU communication error TS20 EL 01 System lacks refrigerant TS24 EL 0C Communication malfunction between adapter board and outdoor main board TS42 EL 16 Refrigerant sensor error...

  • Page 71: Engineering Mode

    3. Engineering Mode Information Inquiry In order to enter to the engineering mode, and check the data of the system (data checking mode), Please make the following steps: • Make sure that the AC is on the standby status, or working normally in a non-locked conditions. •...
  • Page 72 Display Error Information IDU EEPROM malfunction EH 00 IDU EEPROM parameter error EH 0A IDU & ODU communication error EL 01 Communication error between indoor unit and external fan module EH A Parameters error of indoor external fan EH 30 Phase failure of indoor external fan EH 35 Indoor external fan current sampling bias fault...
  • Page 73 Current Input detection protection Pc 41 Compressor start error PC 42 Lack of phase (3 phase) protection PC 43 Outdoor unit zero speed protection PC 44 341PWM error PC 45 Compressor speed malfunction PC 46 Compressor over current protection PC 49 Compressor discharge temperature protection PC 06 Outdoor current protection...

  • Page 74: Advanced Function Setting

    Advanced Function Setting In order to enter to the engineering mode, and check the advanced function settings, Please make the following steps: If you want to check the current functions set value (Presetting Page): 1- Firstly, you need to disconnect the power supply from the unit, and wait for 1 minute. 2- Then connect the power supply again to the unit (the unit should be under the standby state).
  • Page 75 Channel Function Parameter Value Meaning Remark Capacity setting 1-100K (Btu/h) 0 – Inactive Auto-restart function 1 – Active 1- Fan stop 2 - Fan runs at lowest RPM 3 - Fan runs at setting RPM 4 - Fan stops for 4 mins and runs for 1mins 5 - Fan stops for 8 mins and runs for 1mins 6 - Fan stops for 16 mins and runs for 1mins 7 - Fan stops for 24 mins and runs for 1mins...
  • Page 76 Capacity setting(kW) 23,26,32,35,51,72,120,-- (Cancel) Max. frequency selection in cooling 40, 41, 42, …, 83, 84, -- (Cancel) mode Max. frequency selection in heating 40, 41, 42, …, 83, 84, -- (Cancel) Without limitation mode Cooling temperature -3.0, -2.5, -2.0, …, 3.0, 3.5, -- (Cancel) compensation Heating temperature -6.5, -6.0, -5.5, …, 0.5, 1.0, 1.5, …, 7.0, 7.5, -- (Cancel)

  • Page 77: Error Diagnosis And Troubleshooting Without Error Code

    4. Error Diagnosis and Troubleshooting Without Error Code WARNING Be sure to turn off unit before any maintenance to prevent damage or injury. Remote maintenance SUGGESTION: When troubles occur, please check the following points with customers before field maintenance. Problem Solution Unit will not start TS14 - TS15...

  • Page 78: Field Maintenance

    Field maintenance Problem Solution Unit will not start TS16 - TS17 Compressor will not start but fans run TS16 - TS17 Compressor and condenser (outdoor) fan will not start TS16 - TS17 Evaporator (indoor) fan will not start TS16 - TS17 Condenser (Outdoor) fan will not start TS16 - TS17 Unit runs, but shortly stops...
  • Page 79 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 80 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 81 2.Field Maintenance Refrigerant Circuit Others 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 ☆...
  • Page 82 2.Field Maintenance Electrical Circuit Possible causes of trouble Unit will not start ☆ ☆ ☆ ☆ ☆ ☆ Compressor will not start but fans run ☆ ☆ ☆ ☆ ☆ Compressor and condenser (outdoor) fan will not start ☆ ☆ ☆...

  • Page 83: Quick Maintenance By Error Code

    5. Quick Maintenance by Error Code If you do not have the time to test which specific parts are faulty, you can directly change the required parts according the error code. You can find the parts to replace by error code in the following table. Error Code Part requiring replacement...

  • Page 84: Troubleshooting By Error Code

    6. Troubleshooting by Error Code EH 00/ EH 0A / EC 51 (EEPROM Malfunction Error Diagnosis and Solution) 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 85: El 01 (Indoor And Outdoor Unit Communication Error Diagnosis And Solution)

    EL 01 (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 • Reactor Troubleshooting and repair: Current loop Communication(S Communication): Power off, then restart the unit after 2 minutes.
  • Page 86 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 87: Troubleshooting And Repair

    485 Communication(S1,S2 Communication): Recommended parts to prepare: • Signal wires • Magnet ring • Indoor PCB • Outdoor PCB Troubleshooting and repair: Power off, then restart the unit 2 minutes later Check whether there’s any interference. Remove interference or Such as too many lamps , power add magnet ring on power transformers? Or the signal wire wire...

  • Page 88: Eh 03 / Ec 07 (Fan Speed Is Operating Outside Of Normal Range Diagnosis And Solution)

    EH 03 / EC 07 (Fan Speed Is Operating Outside of Normal Range Diagnosis and Solution) Description: When indoor / outdoor fan speed keeps too low or too high for a certain time, the unit ceases operation and the LED displays the failure. Recommended parts to prepare: •...
  • Page 89 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. If the value of the voltage is not in the range showing in below table, the PCB must has problems and need to be replaced. Color Signal Voltage...

  • Page 90: Eh 60/Eh 61/Eh 62/Eh 66/Eh 65/Ec 53/Ec 52/Ec 54/Ec 56 (Open Circuit Or Short Circuit Of Temperature Sensor Diagnosis And Solution)

    EH 60/EH 61/EH 62/EH 66/EH 65/EC 53/EC 52/EC 54/EC 56 (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. Recommended parts to prepare: •...

  • Page 91: El 0C (System Lacks Refrigerant Diagnosis And Solution)

    EL 0C (System lacks refrigerant Diagnosis and Solution) Description: Judging the abnormality of the refrigeration system according to the number of compressor stops and the changes in operating parameters caused by excessive exhaust temperature. Recommended parts to prepare: • Indoor PCB •...

  • Page 92: Eh 0E(Water-Level Alarm Malfunction Diagnosis And Solution)

    EH 0E(Water-Level Alarm Malfunction Diagnosis and Solution) Description: If the sampling voltage is not 5V, the LED displays the failure code. Recommended parts to prepare: • Connection wires • Water-level switch • Water pump • Indoor PCB Shut off the power supply and Shut off the power supply and turn it on 2 minutes later.

  • Page 93: Pc 00(Odu Ipm Module Protection Diagnosis And Solution)

    PC 00(ODU IPM module protection Diagnosis and Solution) Description: When the voltage signal the IPM sends to the compressor drive chip is abnormal, the display LED shows “PC 00” and the AC turn off. Recommended parts to prepare: • Connection wires •...

  • Page 94: Pc 01(Odu Voltage Protection Diagnosis And Solution)

    PC 01(ODU 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: • Power supply wires • IPM module board • PCB • Reactor Troubleshooting and repair: Check the power supply.

  • Page 95: Pc 04(Inverter Compressor Drive Error Diagnosis And Solution)

    PC 04(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: • Connection wires •...

  • Page 96: Pc 03(Pressure Protection(Low Or High Pressure) Diagnosis And Solution)

    6.10 PC 03(Pressure protection(low or high pressure) Diagnosis and Solution) Description: Outdoor pressure switch cut off the system because high pressure is higher than 4.4 MPa or outdoor pressure switch cut off the system because low pressure is lower than 0.13 MPa, the LED displays the failure code. Recommended parts to prepare: •...
  • Page 97 High pressure protection High pressure protection Are the high pressure switch Are the high pressure switch Connect high pressure switch and Connect high pressure switch and and main control boar wired and main control boar wired mian control board mian control board correctly? correctly? Is the high pressure...
  • Page 98 Low pressure protection Low pressure protection Are the low pressure protector Are the low pressure protector Reconnect the low pressure protector Reconnect the low pressure protector and main control board wired and main control board wired and main control board and main control board properly? properly?

  • Page 99: Pc 02(Compressor Top (Or Ipm) Temp. Protection Diagnosis And Solution)

    6.11 PC 02(Compressor top (or IPM) temp. protection diagnosis and solution) Description: For some models with overload protection, If the sampling voltage is not 5V, the LED will display the failure. If the temperature of IPM module is higher than a certain value, the LED displays the failure code. Recommended parts to prepare: •...

  • Page 100: Pc 0L (Low Ambient Temperature Protection)

    Check the fastening screws on the PCB and IPM radiator. Replace the outdoor Are they fixed tightly? control PCB. Tighten the screws and apply silicon grease. 6.12 PC 0L (Low ambient temperature protection) Description: It is a protection function. When compressor is off, outdoor ambient temperature(T4) is lower than -35 for 10s, the AC will stop and display the failure code.

  • Page 101: Eh B3 (Communication Malfunction Between Wire And Master Control) Diagnosis And Solution

    6.13 EH b3 (Communication malfunction between wire and master control) Diagnosis and Solution Description: If Indoor PCB does not receive feedback from wired controller, the error displays on the wired controller Recommended parts to prepare: • Connection wires • Indoor PCB •...

  • Page 102: Eh Ba(Communication Malfunction Between Indoor Unit And External Fan Module)/Eh

    6.14 EH bA(Communication malfunction between indoor unit and external fan module)/ EH 3A(External fan DC bus voltage is too low protection)/ EH 3b(External fan DC bus voltage is too high fault) diagnosis and solution Description: Indoor unit does not receive the feedback from external fan module during 150 seconds. or Indoor unit receives abnormal increases or decreases in voltage from external fan module.

  • Page 103: Fh Cc(Refrigerant Sensor Error) Or Eh C3(Refrigerant Sensor Is Out Of Range) Diagnosis And Solution

    6.15 FH CC(Refrigerant sensor error) or EH C3(Refrigerant sensor is out of range) diagnosis and solution Description: Indoor unit receives fault signal for 10s or indoor unit does not receive feedback from refrigerant sensor for 150s. Recommended parts to prepare: •...

  • Page 104: Eh C1(Refrigerant Sensor Detects Leakage) Or Eh C2(Refrigerant Sensor Is Out Of Range And Leakage Is Detected) Diagnosis And Solution

    6.16 EH C1(Refrigerant sensor detects leakage) or EH C2(Refrigerant sensor is out of range and leakage is detected) diagnosis and solution Description: The refrigerant sensor detects a concentration higher than or equal to 10%*LFL for 10 seconds or the refrigerant sensor detects a concentration higher than or equal to 20%*LFL or the multi model receives the refrigerant leakage protection fault sent by the outdoor unit.

  • Page 105: Ec 0D(Odu Malfunction Diagnosis And Solution)

    6.17 EC 0d(ODU malfunction Diagnosis and Solution) Description: The indoor unit detect the outdoor unit is error. Recommended parts to prepare: • Outdoor unit Troubleshooting and repair: Power off, then restart the unit 2 Power off, then restart the unit 2 minutes later.

  • Page 106: Eh 0B(Idu Main Control Board And Display Board Communication Error Diagnosis And Solution)

    6.18 EH 0b(IDU main control board and display board communication error diagnosis and solution) Description: Indoor PCB does not receive feedback from the display board. Recommended parts to prepare: • Communication wire • Indoor PCB • Display board Troubleshooting and repair: ...

  • Page 107: El 16(Communication Malfunction Between Adapter Board And Outdoor Main Board Diagnosis And Solution)

    6.19 EL 16(Communication malfunction between adapter board and outdoor main board diagnosis and solution) Description: The adapter PCB cannot detect the main control board. Recommended parts to prepare: • Connection wires • Adapter board • Outdoor main PCB Troubleshooting and repair: Power off, then restart the unit after 3 minutes.

  • Page 108: Check Procedures

    7. Check Procedures 7.1 Temperature Sensor Check WARNING Be sure to turn off all power supplies or disconnect all wires to avoid electric shock. Operate after compressor and coil have returned to normal temperature in case of injury. 1. Disconnect temperature sensor from PCB (Refer to Indoor Disassembly and Outdoor Disassembly). 2.
  • Page 109 Appendix Contents Temperature Sensor Resistance Value Table for TP (°C --K) ........2 Other Temperature Sensors Resistance Value Table (°C – K) ......3 iii) System Pressure Table ...................4...
  • Page 110 i) Temperature Sensor Resistance Value Table for TP (°C --K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm 542.7 68.66...
  • Page 111 ii) Other Temperature Sensors Resistance Value Table (°C – K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5 2.19073 0.59386 96.3423 10.9731 2.11241 0.57683 89.5865...
  • Page 112 iii) System Pressure Table-R454B Pressure Temperature Pressure Temperature °C °F °C °F 58.196 0.58 8.44 935.23 9.35 135.64 46.4 61.517 0.62 8.92 -74.2 963.75 9.64 139.78 48.2 64.988 0.65 9.43 -72.4 992.93 9.93 144.01 68.615 0.69 9.95 -70.6 1022.8 10.23 148.34 51.8 72.402...
  • Page 113 422.31 4.22 61.25 2956.5 29.57 428.79 125.6 437.92 4.38 63.51 3025 30.25 438.72 127.4 453.98 4.54 65.84 3094.7 30.95 448.83 129.2 470.47 4.70 68.23 3165.7 31.66 459.13 487.43 4.87 70.69 10.4 3238.1 32.38 469.63 132.8 504.84 5.05 73.22 12.2 3311.7 33.12 480.30 134.6...
  • Page 114 Before After Page No. Note Date Page 19~28 Update Fan Performance of 18k~60k(Horizontal scale alignment) 2024.5.31 Page 35-36 Update wiring diagram 2024.5.31 Page 39 Change Website address to Net address 2024.5.31 1、Change 65/213.3 to 246/75 Page 50 2024.5.31 2、Delete 7/8" (22） Page 51 Delete 7/8"...
  • Page 115 Page 36 Change wire diagram of 30k~60k 2024.9. Page 46 update Function combination table of SW1-1 and SW1-4 2024.9. Page 51 Change drawing 2024.9. Page 57 Add outdoor unit 2024.9. Page 59 Change drawings 2024.9.

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