Page 1 CEILING CASSETTE (4-WAY) AIR HANDLER EXTREME HEAT SINGLE-ZONE & MULTI-ZONE SYSTEMS SERVICE MANUAL Models Covered: ACiQ-09CC-HH-MC ACiQ-12CC-HH-MC ACiQ-18CC-HH-MC ACiQ-24CC-HH-MC ACiQ-36CC-HH-MC ACiQ-48CC-HH-MC ACiQ-CC-GRILLE-C ACiQ-CC-GRILLE-24C VERSION DATE: 01-03-25...
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 Air Velocity and Temperature Distributions Sound Pressure Levels Refrigerant System Diagram Electrical Characteristics Electrical Wiring Diagrams Installation...
Page 5: Safety Precautions
Safety Precautions Contents Precautions ......................2 Information servicing(For flammable materials) ..........4...
Page 6: Operation And Maintenance
1. Precautions CAUTION To prevent personal injury, or property or unit damage, • While unpacking be careful of sharp edges around adhere to all precautionary measures and instructions the unit as well as the edges of the fins on the con- denser and evaporator.
Page 7 the system; WARNING For Using Flammable Refrigerant -- that steel pipes and components shall be protected against 1. Installation (Space) corrosion with a rustproof coating before applying any insulation; - That the installation of pipe-work shall be kept to a minimum. -- that precautions shall be taken to avoid excessive vibration or - That pipe-work shall be protected from physical damage.
Page 8: Work Procedure
Examples for such working procedures are: is to be surveyed to make sure that there are no flammable • breaking into the refrigerating circuit; hazards or ignition risks. • opening of sealed components; • NO SMOKING signs shall be displayed. •...
Page 9 2.10 Sealed electrical components shall be adequate, or may need re-calibration. (Detection equipment shall be calibrated in a refrigerant-free area.) Ensure that replaced the detector is not a potential source of ignition and is suitable for the refrigerant used. Leak detection equipment •...
Page 10 2.15 Charging procedures completed, make sure that the cylinders and the equipment are removed from site promptly and all isolation valves on the equipment are closed off. • In addition to conventional charging procedures, the following requirements shall be followed: •...
Page 11 Compliance with local regulations 3. Disposal of equipment using flammable refrigerants Compliance with national regulations 4. Storage of equipment/appliances The storage of equipment should be in accordance with the manufacturer’s instructions. 5. Storage of packed (unsold) equipment Storage package protection should be constructed such that mechanical damage to the equipment inside the package will not cause a leak of the refrigerant charge.
Page 12: Model Reference
Model Reference Contents Model Reference ....................2 External Appearance .....................2...
Page 13: External Appearance
1. Model Reference Capacity Indoor Unit Model Power Supply (Btu/h) ACiQ-09CC-HH-MC Compact ACiQ-12CC-HH-MC Cassette ACiQ-18CC-HH-MC 1Phase, 208/230V~, 60Hz ACiQ-24CC-HH-MC New Four- ACiQ-36CC-HH-MC way Cassette ACiQ-48CC-HH-MC 2. External Appearance Indoor Unit 9K-18K Ceiling Cassette (4-Way) 24K-48K Ceiling Cassette (4-Way)  Model Reference...
Page 14: Table Of Contents
Indoor Unit-Ceiling Cassette (4-Way) Contents Feature........................2 Dimensional Drawings ..................5 Part names ......................7 Service Place ......................7 Accessories ......................8 Air Velocity and Temperature Distributions ............9 Sound Pressure Levels ..................21 Refrigerant System Diagram ................23 Electrical Characteristics ..................24 Electrical Wiring Diagrams ..................24...
Page 15: Feature
1. Feature Compact Ceiling Cassette (9K-18K) Nearly 360° Air Discharge for the Highest Efficiency and Comfort • With near to 360° air discharge deliver even and powerful air flow, you will never be bothered by harsh, cold air draughts. Enjoy a real immersive air in open space. Individual vane control customized Everyone’s Own Comfort •...
Page 16: Easy Installation
New four-way Cassette (24K~48K) Air Flow • 360°directional wind can deliver air evenly throughout every corner in any space, reducing hot and cold spots in the room. Easy Installation • The Cassette is much slimmer due to the redesigned heat exchanger and overall structures. It now requires less space for installation.
Page 17 Wired Controller(Optional) • Compared with infrared remote controller, wired controller can be fixed on the wall and avoid mislaying. It's mainly used for commercial zone and makes air conditioner control more convenient. Build-in Drain Pump • The drain pump can lift the condensed water up to 1000mm. Which is convenient to install drainage pipes under most conditions.
Page 18: Dimensional Drawings
2. Dimensional Drawings 9K~18K  IDU-4-Way Cassette 5 ...
Page 19 Model Unit (KBtu/h) inch 8.07 inch 9.65 inch 11.30  IDU-4-Way Cassette 6 ...
Page 20: Part Names
3. Part names 4. Service Place >39in/1000mm >39in/1000mm >39in/1000mm >39in/1000mm  IDU-4-Way Cassette 7 ...
Page 21: 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 22: Air Velocity And Temperature Distributions
6. Air Velocity and Temperature Distributions 9k- Discharge Angle 50° Cooling airflow velocity distributions Cooling temperature distributions  IDU-New Cassette 9 ...
Page 23 9k-Discharge Angle 65° Heating airflow velocity distributions Heating temperature distributions  IDU-New Cassette 10 ...
Page 24 12k- Discharge Angle 50° Cooling airflow velocity distributions Cooling temperature distributions  IDU-New Cassette 11 ...
Page 25 12k-Discharge Angle 65° Heating airflow velocity distributions Heating temperature distributions  IDU-New Cassette 12 ...
Page 26 18k- Discharge Angle 50° Cooling airflow velocity distributions Cooling temperature distributions  IDU-New Cassette 13 ...
Page 27 18k-Discharge Angle 65° Heating airflow velocity distributions Heating temperature distributions  IDU-New Cassette 14 ...
Page 28 24k- Discharge Angle 50° Cooling airflow velocity distributions Cooling temperature distributions  IDU-New Cassette 15 ...
Page 29 24k-Discharge Angle 65° Heating airflow velocity distributions Heating temperature distributions  IDU-New Cassette 16 ...
Page 30 36k- Discharge Angle 50° Cooling airflow velocity distributions Cooling temperature distributions  IDU-New Cassette 17 ...
Page 31 36k-Discharge Angle 65° Heating airflow velocity distributions Heating temperature distributions  IDU-New Cassette 18 ...
Page 32 48k- Discharge Angle 50° Cooling airflow velocity distributions Cooling temperature distributions  IDU-New Cassette 19 ...
Page 33 48k-Discharge Angle 65° Heating airflow velocity distributions Heating temperature distributions  IDU-New Cassette 20 ...
Page 34: Sound Pressure Levels
7. Sound Pressure Levels Sound pressure level 1.4m/4.59ft Notes: -Sound measured at 1.4m/4.59ft away from the noisiest location 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 35 NC Curves ACiQ-12CC-HH-MC ACiQ-09CC-HH-MC ACiQ-18CC-HH-MC ACiQ-24CC-HH-MC  IDU-4-Way Cassette 22 ...
Page 36: Refrigerant System Diagram
ACiQ-48CC-HH-MC ACiQ-36CC-HH-MC 8. Refrigerant System Diagram Refrigerant GAS pipe connection (Flare) thermistor T2 Cond./Eva.temperature(Gas) heating cooling indoor heat exchanger Distributor Refrigerant LIQUID pipe connection (Flare) thermistor T1 (room temperature)  IDU-4-Way Cassette 23 ...
Page 37: Electrical Characteristics
9. Electrical Characteristics 9k~48k Indoor model Phase Power Frequency And Volt 208/230V,60Hz Minimum Circuit Ampacity Max Fuse 10. Electrical Wiring Diagrams IDU Capacity (Btu/h) IDU Wiring Diagram 9k~18k 16022500005983 16022500006023 36k~48k 16022500006043 Abbreviation Paraphrase Yellow-Green Conductor PUMP PUMP TO CCM Comm.Bus Central Controller Indoor Room Temperature Coil Temperature of Indoor Heat Exchanger...
Page 41: Wiring Diagrams
10.1 Some connectors introduce: NEWFAN REMOTE ON/OFF ON - OFF CN23 Output:230VAC Input:12VDC A For remote control (ON-OFF) terminal port CN23 and short connector of JR6 1. Remove the short connector of JR6 when you use ON-OFF function; 2. When remote switch off (OPEN) ;the unit would be off; 3.
Page 42 ALARM ALARM CN33 DRY CONTACT B 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 43 NEWFAN REMOTE ON/OFF ON - OFF CN23 Output:230VAC Input:12VDC C. For new fresh motor terminal port CN8 1. Connect the fan motor to the port , no need care L/N of the motor ; 2. The output voltage is the power supply; 3.
Page 44 10.2 Micro-Switch Introduce: A. Micro-switch SW1 is for selection of indoor fan stop temperature (TEL0) when it is in anti-cold wind action in heating mode. Range: 24 C, 15 C, 8 C, According to EEROM setting (reserved for special customizing). FOR FAN MOTER SW2 / SWITCH...
Page 45 C.Micro-switch SW2-2 is for selection of Breezeless function. Range: OFF, ON. D.Micro-switch SW3 is for selection of auto-restart function. Range: Active, inactive E.Micro-switch SW6 is for selection of temperature compensation in heating mode. This helps to reduce the real temperature difference between ceiling and floor so that the unit could run properly. If the height of installation is lower, smaller value could be chosen.
Page 46 G.Micro-switch S1 and dial-switch S2 are for address setting when you want to control this unit by a central controller. Range: 00-63 AUTO H. Dial-switch ENC1: The indoor PCB is universal designed for whole series units from 6K to 60K. This ENC1 setting will tell the main program what size the unit is.
Page 47: Installation
Installation Contents Location Selection Indoor Unit Installation Drainage Pipe Installation Refrigerant Pipe Installation Engineering of Insulation Engineering of Electrical Wiring...
Page 48: Location Selection
drilled. 1. Location selection 20.5in/ 521mm (Suspension bolt) 1.1 Unit location selection can refer to Refrigerant piping side installation manual. Drain hose side 1.2 DO NOT install the unit in the following locations: • Areas with oil drilling or fracking. •...
Page 49 NOTE:The bottom of the unit should be 0.4-0.98in (10-25mm) higher than the ceiling board. Generally, L >39in/1000mm (indicated in the following figure) should be half the length >39in/1000mm of the suspension bolt or long enough to prevent the nuts from coming of. >39in/1000mm >39in/1000mm CAUTION:...
Page 50: Panel Installation
2.3.3 Install the panel with four screws(M5), as shown. Paper pattern for installation Center of the ceiling openiing bolts 2.3 Panel Installation 2.3.1 Remove the front grille 1. Push both of the tabs towards the middle simultaneously to unlock the hook on the grille. 2.
Page 51: Drainage Pipe Installation
Bolt Install cover rope Panel hook Re-installed into the style grid. Reinstall the installation cover. The display board CN2 is connected to a connecting cable. Fix the installation cover plate rope to the pillar of the Then connect the other side of the connecting cable to the installation cover plate, and gently press the installation optional wired controller.
Page 52 39-59in (1-1.5m) ≤29.5in (75cm) NOTE:When connecting multiple drainpipes,install the pipes as illustrated in the following Figure. Vent ≤29.5in (75cm) Pass the drain hose through the wall hole. Make sure the water drains to a safe location where it will not cause water damage or a slipping hazard. NOTE: The drainpipe outlet should be at least 1.9in(5cm) above the ground.
Page 53: 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 Ø7/8 (Ø22) 0.039/1...
Page 54 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 55: Engineering Of Insulation
• 5 . Engineering of Insulation Be sure not bind the insulation material over-tight, it may extrude out the air in the material to cause bad 5.1 Insulation of refrigerant pipe insulation and cause easy aging of the material. 5.2 Insulation of drainage pipe 1.
Page 56: Engineering Of Electrical Wiring
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 57 Product Features Contents Display Function ....................2 Safety Features ......................3 Basic Functions .......................4 Table ......................4 Abbreviation ....................5 Fan Mode ......................5 Cooling Mode ....................5 Heating Mode(Heat Pump Units) ..............6 Auto-mode ....................6 Drying Mode ....................7 Forced Operation Function ................7 Timer Function ....................7 3.10 Sleep Function ....................7 3.11 Auto-Restart Function ..................7 3.12 8°C Heating(Heat pump units) ...............7 3.13 Follow me .....................8...
Page 58: Display Function
1. Display Function Electric heating indicator Alarm indicator ( some models) When wireless control LED display feature is activated ( some models) Timer PRE-DEF indicator indicator (pre-heating/defrost) Operation indicator  Product Features ...
Page 59: Safety Features
2. Safety Features Compressor three-minute delay at restart Compressor functions are delayed for up to ten seconds upon the first startup of the unit, and are delayed for up to three minutes upon subsequent unit restarts. Automatic shutoff based on discharge temperature If the compressor discharge temperature exceeds a certain level for nine seconds, the compressor ceases operation.
Page 60: Basic Functions
3. Basic Functions Table Functions Auto mode Cases Case 1 Case 2 Case 3 9k~48k Models Note: The detailed description of case 1 or case 2 is shown in the following function sections(from 3.4 to 3.6).  Product Features ...
Page 61: Abbreviation
Abbreviation • When T1-Tsc is higher than or equal 0.5°C/0.9°F, fan speed increases to 40%; Unit element abbreviations • When T1-Tsc is higher than or equal 1°C/1.8°F,, fan speed increases to 60%; Abbreviation Element • When T1-Tsc is higher than or equal 1.5°C/2.7°F, Indoor room temperature fan speed increases to 80%;...
Page 62: Auto-Mode
• If the temperature difference of T2 changes during auto fan and causes the fan speed to change, run the current fan speed for 30 seconds first, the default interval is the interval before the fan speed changes, and then judge T2 according to the current interval after 30 seconds to get the final anti-cold air interval.
Page 63: Drying Mode
Timer Function fan-only mode on the basis of T1,Ts, Outdoor ambient temperature(T4) and relative humidity(φ). • The timing range is 24 hours. • Timer On. The machine turns on automatically at the preset time. • Timer Off. The machine turns off automatically at the preset time.
Page 64: Follow Me
3.13 Follow me • Once the follow me function is active, the remote control will send a signal every 3 minutes, with no beeps. The unit automatically sets the temperature according to the measurements from the remote control. • The unit will only change modes if the information from the remote control makes it necessary, not from the unit’s temperature setting.
Page 65: Optional Functions
4. Optional Functions Active Clean function (for some models) (Multi-Zone Systems do not Silence(Multi-Zone Systems do not have this function) have this function) • The Active Clean Technology washes away dust, mold, • Press “Silence” or keep pressing Fan button for more and grease that may cause odors when it adheres to the heat exchanger by automatically freezing and then than 2 seconds on the remote control to enable 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 6.10 PC03(Pressure protection (low or high pressure) Diagnosis and Solution) ....31 6.11 PC02(Compressor top (or IPM) temp. proteciton Diagnosis and Solution) ....34 6.12 PC0L (Low ambient temperature protection) ............. 35 6.13 EH b3 (Communication malfunction between wire and master control) Diagnosis and Solution 6.14 EH bA(Communication error between the indoor unit and the external fan module)/ EH3A(External fan DC bus voltage is too low protection)/ EH3b(External fan DC bus voltage is too high fault) diagnosis and solution ................
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
IDU & ODU communication error TS20 EL01 System lacks refrigerant TS26 EL0C Communication malfunction between main unit and secondary units TS40 EL11 Refrigerant sensor error TS38 FHCC ODU IPM module protection TS28 PC00 ODU voltage protection TS29 PC01 Compressor top (or IPM) temp. proteciton TS34 PC02 Pressure protection (low or high pressure) (for some models)
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 5-The engineering mode will be exited if there is no valid input data for 60s. Error code of engineer mode Display Error Information IDU EEPROM malfunction EH00 IDU EEPROM parameter error EH0A IDU & ODU communication error EL01 Communication error between indoor unit and external fan module EH A Parameters error of indoor external fan EH30...
Page 73 Top temperature protection of compressor or High temperature protection of IPM module PC02 Communication error between outdoor main chip and compressor driven chip PC40 Current Input detection protection PC41 Compressor start error PC42 Lack of phase (3 phase) protection PC43 Outdoor unit zero speed protection PC44 341PWM error...
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 Fan control when Ts 2 - Fan runs at lowest RPM reached 3 - Fan runs at setting RPM 4~11 - Fan stops for 4 mins and runs for 1min CH–Cooling and heating (all modes) Remote controller will...
Page 76 Heating temperature -6.5, -6.0, -5.5, …, 0.5, 1.0, 1.5, …, 7.0, 7.5, -- (Cancel) compensation Max. fan speed -41, -40, -39, …, 19, 20, -- (Cancel) selection in cooling Min. fan speed -41, -40, -39, …, 19, 20, -- (Cancel) selection in cooling Max.
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 EH00/ EH0A / EC51 (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: El01 (Idu & Odu Communication Error Diagnosis And Solution)
EL01 (IDU & ODU 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 87 485 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: Eh03 / Ec07 (Fan Speed Out Of Control Diagnosis And Solution)
EH03 / EC07 (Fan Speed Out of Control 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: Eh60/Eh61/Ec53/Ec52/Ec54/Ec56 (Open Circuit Or Short Circuit Of Temperature Sensor Diagnosis And Solution)
EH60/EH61/EC53/EC52/EC54/EC56 (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: • Connection wires • Sensors • PCB Troubleshooting and repair: Check the connection between temperature sensor and PCB.
Page 91: El0C (System Lacks Refrigerant Diagnosis And Solution)
EL0C (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: Eh0E(Water-Level Alarm Malfunction Diagnosis And Solution)
EH0E(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: Pc00(Odu Ipm Module Protection Diagnosis And Solution)
PC00(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 “PC00” and the AC turn off. Recommended parts to prepare: • Connection wires • IPM module board •...
Page 94: Pc01(Odu Voltage Protection Diagnosis And Solution)
PC01(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: Pc04(Inverter Compressor Drive Error Diagnosis And Solution)
PC04(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: Pc03(Pressure Protection (Low Or High Pressure) Diagnosis And Solution)
6.10 PC03(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: Pc02(Compressor Top (Or Ipm) Temp. Proteciton Diagnosis And Solution)
6.11 PC02(Compressor top (or IPM) temp. proteciton 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: Pc0L (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 PC0L (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 Error Between The Indoor Unit And The External Fan Module)
6.14 EH bA(Communication error between the indoor unit and the external fan module)/ EH3A(External fan DC bus voltage is too low protection)/ EH3b(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: Fhcc(Refrigerant Sensor Error) Or Ehc3(Refrigerant Sensor Is Out Of Range) Diagnosis And Solution
6.15 FHCC(Refrigerant sensor error) or EHC3(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: • Connection wires •...
Page 104: Ehc1(Refrigerant Sensor Detects Leakage) Or Ehc2(Refrigerant Sensor Is Out Of Range And Leakage Is Detected) Diagnosis And Solution
6.16 EHC1(Refrigerant sensor detects leakage) or EHC2(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: El11 (Communication Malfunction Between Main Unit And Secondary Units(For Twins System)
6.17 EL11 (Communication malfunction between main unit and secondary units(for twins system) Diagnosis and Solution) Description: When set in twins system, master unit and slave unit cannot be recognized normally. Recommended parts to prepare: • Connection wires • Indoor PCB Check the dial switch Check the dial switch Correct the settings...
Page 106: 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 107 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 108 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 109 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 110 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 111 422.31 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 112 The design and specifications are subject to change without prior notice for product improvement. Consult with the sales agency or manufacturer for details. Any updates to the manual will be uploaded to the service website, please check for the latest version. Ceiling Cassette Service Manual (9K-48K) (NA_H_240717)

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