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ACIQ -09CD-HH-MC Service Manual

High-static concealed duct air handler (9k-60k units)
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HIGH-STATIC CONCEALED DUCT AIR HANDLER (9K-60K UNITS)
SERVICE MANUAL
Models Covered:
ACiQ-09CD-HH-MC
ACiQ-12CD-HH-MC
ACiQ-18CD-HH-MC
ACiQ-24CD-HH-MC
ACiQ-36CD-HH-MC
ACiQ-48CD-HH-MC
ACiQ-60CD-HH-MC
VERSION DATE: 01-06-25

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Summary of Contents for ACIQ ACiQ-09CD-HH-MC

  • Page 1 HIGH-STATIC CONCEALED DUCT AIR HANDLER (9K-60K UNITS) SERVICE MANUAL Models Covered: ACiQ-09CD-HH-MC ACiQ-12CD-HH-MC ACiQ-18CD-HH-MC ACiQ-24CD-HH-MC ACiQ-36CD-HH-MC ACiQ-48CD-HH-MC ACiQ-60CD-HH-MC VERSION DATE: 01-06-25...
  • 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 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: 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 tested prior to refrigerant charging, according to the following WARNING For Using Flammable Refrigerant requirements: 1. Installation(where refrigerant pipes are allowed) a. The minimum test pressure for the low side of the system shall - Any person who is involved with working on or breaking into a be the low side design pressure and the minimum test pressure refrigerant circuit should hold a current valid certificate from an for the high side of the system shall be the high side design pres-...

  • Page 8: Work Procedure

    2. Information servicing(For hot work. A degree of ventilation shall continue during the period that the work is carried out. The ventilation should flammable materials) safely disperse any released refrigerant and preferably expel it externally into the atmosphere. Checks to the area Checks to the refrigeration equipment •...
  • Page 9 2.12 Cabling national codes. For appliances containing flammable refrigerants, the system shall be purged with oxygen- free nitrogen to render the appliance safe for flammable • Check that cabling will not be subject to wear, corrosion, refrigerants. This process might need to be repeated several excessive pressure, vibration, sharp edges or any other times.
  • Page 10 used correctly; • The recovered refrigerant shall be processed according to local legislation in the correct recovery cylinder, and • the recovery process is supervised at all times by a the relevant waste transfer note arranged. Do not mix competent person; refrigerants in recovery units and especially not in cylinders.

  • Page 11: Model Reference

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

  • Page 12: External Appearance

    1. Model Reference Capacity Indoor Unit Model Power Supply (Btu/h) ACiQ-09CD-HH-MC ACiQ-12CD-HH-MC ACiQ-18CD-HH-MC High-Static ACiQ-24CD-HH-MC 1Phase, 208/230V~, 60Hz Concealed Duct ACiQ-36CD-HH-MC ACiQ-48CD-HH-MC ACiQ-60CD-HH-MC 2. External Appearance Indoor Unit High-Static Concealed Duct  Model Reference ...

  • Page 13: Table Of Contents

    Indoor Unit - High-Static Concealed Duct Contents Feature........................2 Dimensional Drawings ..................4 Part names ......................5 Service Place ......................6 Accessories ......................7 Fan Performance ....................8 Sound Pressure Levels ..................24 Refrigerant System Diagram ................27 Electrical Characteristics ..................28 Electrical Wiring Diagrams ..................28...

  • Page 14: Feature

    The maximum MSP is increased to 160Pa, which is industry-leading. Also, the maximum HSP is 200Pa, which is comparable to our competitors. ACiQ High-Static Concealed Duct Real-time Constant Air Volume With Auto Airflow Match, the Concealed Duct can automatically match the airflow volume to different ducting design, resulting in installation convenience, comfortable experience and cost saving.
  • Page 15 Optimization of Duct Design By applying the new design of duct, the interior noise level has been reduced significantly. End users would not get irritable easily even staving indoor for a long time. Upgrade of Fan Motor • The design of integrated motor bracket, which is three parts integrated into one part, can improve installation stability, more friendly disassembly and assembly •...

  • Page 16: Dimensional Drawings

    2. Dimensional Drawings Air Outlet Air Return Size Of Fresh Air Intake Outline Dimension Size of refrigerant pipe Capacity Opening Size Opening Size Mounted Lug Opening Size unit (kBtu/h) 9/12 inch 27.6 29.5 31.3 20.7 23.3 29.1 25.2 1000 1040 18/24 inch 39.4...

  • Page 17: Part Names

    3. Part names Refrigerant Piping Air inlet (purchase separately) Air outlet Remote Controller (purchase separately) Electric control Remote controller holder (purchase separately) Drain pipe Wired remote controller  IDU-Concealed Duct 5 ...

  • Page 18: Service Place

    4. Service Place Air outlet ≥11.8in(30cm) ≥7.9in(20cm) 31.5inx31.5in (80cmx80cm) Air inlet checking orifice  IDU-Concealed Duct 6 ...

  • Page 19: 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 20: Fan Performance

    6. Fan Performance 0.08 0.12 0.14 0.16 0.18 0.22 0.02 0.04 0.06 0.08 0.12 External static pressure in.WC External static pressure in.WC Turbo Turbo 0.18 0.22 0.24 0.26 0.28 0.32 0.28 0.32 0.34 0.36 0.38 0.42 External static pressure in.WC External static pressure in.WC Turbo Turbo...

  • Page 21: Constant Air Volume

    0.58 0.62 0.64 0.66 0.68 0.72 0.68 0.72 0.74 0.76 0.78 0.82 External static pressure in.WC External static pressure in.WC Turbo Turbo Constant air volume 0.08 0.16 0.24 0.32 0.48 0.56 0.64 0.72 External static pressure in.WC Turbo  IDU-Concealed Duct 9 ...
  • Page 22 0.02 0.04 0.06 0.08 0.12 0.08 0.12 0.14 0.16 0.18 0.22 External static pressure in.WC External static pressure in.WC Turbo Turbo 0.18 0.22 0.24 0.26 0.28 0.32 0.28 0.32 0.34 0.36 0.38 0.42 External static pressure in.WC External static pressure in.WC Turbo Turbo 0.38...
  • Page 23 0.68 0.72 0.74 0.76 0.78 0.82 0.58 0.62 0.64 0.66 0.68 0.72 External static pressure in.WC External static pressure in.WC Turbo Turbo Constant air volume 0.08 0.16 0.24 0.32 0.48 0.56 0.64 0.72 External static pressure in.WC Turbo  IDU-Concealed Duct 11 ...
  • Page 24 0.02 0.04 0.06 0.08 0.12 0.08 0.12 0.14 0.16 0.18 0.22 External static pressure in.WC External static pressure in.WC Turbo Turbo 1000 1000 0.18 0.22 0.24 0.26 0.28 0.32 0.28 0.32 0.34 0.36 0.38 0.42 External static pressure in.WC External static pressure in.WC Turbo Turbo 1000...
  • Page 25 1000 1000 0.58 0.62 0.64 0.66 0.68 0.72 0.68 0.72 0.74 0.76 0.78 0.82 External static pressure in.WC External static pressure in.WC Turbo Turbo Constant air volume 0.08 0.16 0.24 0.32 0.48 0.56 0.64 0.72 External static pressure in.WC Turbo ...
  • Page 26 1100 1100 1000 1000 0.02 0.04 0.06 0.08 0.12 0.08 0.12 0.14 0.16 0.18 0.22 External static pressure in.WC External static pressure in.WC Turbo Turbo 1100 1100 1000 1000 0.18 0.22 0.24 0.26 0.28 0.32 0.28 0.32 0.34 0.36 0.38 0.42 External static pressure in.WC External static pressure in.WC...
  • Page 27 1100 1100 1000 1000 0.58 0.62 0.64 0.66 0.68 0.72 0.68 0.72 0.74 0.76 0.78 0.82 External static pressure in.WC External static pressure in.WC Turbo Turbo Constant air volume 1000 0.08 0.16 0.24 0.32 0.48 0.56 0.64 0.72 External static pressure in.WC Turbo ...
  • Page 28 1700 1600 1600 1500 1500 1400 1400 1300 1300 1200 1200 1100 1100 1000 1000 0.02 0.04 0.06 0.08 0.12 0.14 0.16 0.12 0.14 0.16 0.18 0.22 0.24 External static pressure in.WC External static pressure in.WC Turbo Turbo 1700 1700 1600 1600 1500...
  • Page 29 1800 1700 1700 1600 1600 1500 1500 1400 1400 1300 1300 1200 1200 1100 1100 1000 1000 0.58 0.62 0.64 0.66 0.68 0.72 0.68 0.72 0.74 0.76 0.78 0.82 External static pressure in.WC External static pressure in.WC Turbo Turbo Constant air volume 1400 1300 1200...
  • Page 30 2100 2100 2000 2000 1900 1900 1800 1800 1700 1700 1600 1600 1500 1500 1400 1400 1300 1300 1200 1200 1100 1100 1000 1000 0.02 0.04 0.06 0.08 0.12 0.14 0.16 0.18 0.22 0.08 0.12 0.14 0.16 0.18 0.22 External static pressure in.WC External static pressure in.WC Turbo Turbo...
  • Page 31 2300 2400 2300 2200 2200 2100 2100 2000 2000 1900 1900 1800 1800 1700 1700 1600 1600 1500 1500 1400 1400 1300 1300 1200 1200 1100 1100 1000 1000 0.58 0.62 0.64 0.66 0.68 0.72 0.68 0.72 0.74 0.76 0.78 0.82 External static pressure in.WC External static pressure in.WC...
  • Page 32 2600 2600 2400 2400 2200 2200 2000 2000 1800 1800 1600 1600 1400 1400 1200 1200 1000 1000 0.02 0.04 0.06 0.08 0.12 0.14 0.16 0.18 0.22 0.08 0.12 0.14 0.16 0.18 0.22 External static pressure in.WC External static pressure in.WC Turbo Turbo 2600...
  • Page 33 2600 2600 2400 2400 2200 2200 2000 2000 1800 1800 1600 1600 1400 1400 1200 1200 1000 1000 0.38 0.42 0.44 0.46 0.48 0.52 0.48 0.52 0.54 0.56 0.58 0.62 External static pressure in.WC External static pressure in.WC Turbo Turbo 2600 2600 2400...
  • Page 34 Constant air volume 2200 2000 1800 1600 1400 1200 1000 0.08 0.16 0.24 0.32 0.48 0.56 0.64 0.72 External static pressure in.WC Turbo  IDU-Concealed Duct 22 ...
  • Page 35 COMMISSION 1,2,3,4,5,6,7,8. The indoor ducted units can be programmed for different a. Press and hold Copy for approximately 3 seconds, static pressures or Real-time constant airflows, Use the The lower right corner shows P:00, Press “OK”. following steps to set the static pressure or Real-time b.

  • Page 36: Sound Pressure Levels

    7. Sound Pressure Levels Sound pressure level 1m/3.28ft 2m/6.56ft 1.5m/4.92ft Notes: -Sound measured at 1.5m/4.92ft away from the center of the unit. -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 37 NC Curves ACiQ-09CD-HH-MC ACiQ-12CD-HH-MC ACiQ-24CD-HH-MC ACiQ-18CD-HH-MC  IDU-Concealed Duct 25 ...
  • Page 38 ACiQ-36CD-HH-MC ACiQ-48CD-HH-MC ACiQ-60CD-HH-MC  IDU-Concealed Duct 26 ...

  • Page 39: Refrigerant System Diagram

    8. Refrigerant System Diagram  IDU-Concealed Duct 27 ...

  • Page 40: Electrical Characteristics

    9. Electrical Characteristics 9k~24k 48k~60k 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~24k 16023000014312 36k~60k 16023000014555 Abbreviation Paraphrase Yellow-Green Conductor PUMP PUMP TO CCM Comm.Bus Central Controller Indoor Room Temperature Sensor Indoor Coil Temperature Sensor...

  • Page 43: Wiring Diagrams

    10.1 Some connectors introduce: ALARM REMOTE OUTPUT ON/OFF ALARM ON/OFF A. For new fresh motor terminal port (also for Anion generator) CN43: 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: Alarm On/Off

    ALARM REMOTE OUTPUT ON/OFF ALARM ON/OFF 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 45 ALARM REMOTE OUTPUT ON/OFF ALARM ON/OFF C. For remote control (ON-OFF) terminal port CN23 and short connector of J7 1. Remove the short connector of J7 when you use ON-OFF function; 2. When remote switch off (OPEN); the unit would be off; 3.
  • Page 46 10.2 Micro-Switch Introduce: FOR COOLING&HEATING OR COOLING ONLY MODE SETTING SW 1 1 2 3 4 COOLING&HEATING COOLING ONLY FACTORY SETTING A. Micro-switch SW1 is for selection of mode. Range: COOLING&HEATING, COOLING ONLY. FOR MAIN-SLAVE SETTING SW 1 1 2 3 4 MAIN NO SLAVE B.Micro-switch SW1 is for setting the master or slave unit when the unit is in twin connection.
  • Page 47 SW 2 1 2 3 4 D. Micro-switch SW2 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 48: Installation

    Installation Contents Location Selection Indoor Unit Installation Drainage Pipe Installation Refrigerant Pipe Installation Engineering of Insulation Engineering of Electrical Wiring Installation of Electric Auxiliary Heat Module...

  • Page 49: Location Selection

    1. Location selection 2) Wall-mounted 1.1 Unit location selection can refer to installation manual. 1.2 DO NOT install the unit in the following locations: • Areas with oil drilling or fracking. • Coastal areas with high salt content in the air. •...

  • Page 50: Duct Installation

    2.4 Duct installation 2. Install and fit pipes and wires after you have finished installing the main body. When choosing where to start, 1. Install the filter(optional) according to the size of the air determine the direction of the pipes to be drawn out. inlet.

  • Page 51: Wall Mounted Installation

    2.5 Wall mounted installation 2.6 Filter installation The unit supports wall mounted, if the unit is purchased 1. Take off ventilation panel and flange, with a pump and requires vertical mounting, please follow Air return flange the steps below: 1. Remove the electrical control box cover, unplug the pump and water level switch terminals from the main control board.

  • Page 52: Connect Drain Hose

    • DO NOT pull the drainpipe forcefully. This could disconnect it. NOTE ON PURCHASING PIPES • Installation requires a polyethylene tube (exterior diameter = 1.46-1.54in/3.7-3.9cm, interior diameter = 1.26in/3.2cm), which can be obtained at your local hardware store or dealer. Air return flange Indoor Drainpipe Installation Install the drainpipe as illustrated in the following Figure.
  • Page 53 To check for water leaks >2in(50mm) The procedure differs depending on whether electrical wiring is already finished. When the electrical wiring is >2in(50mm) not finished yet, you need to temporarily connect the user >2in(50mm) interface and power supply to the unit. When electrical wiring is not finished yet 1.
  • Page 54 11. Disconnect the power supply and earth. 12. Reattach the control box cover. When electrical wiring is finished already 1. Start cooling operation. 2. Gradually pour approximately 1 l of water through the air discharge outlet, and check for leaks.  3.

  • Page 55: 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 56 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 57: 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 58: 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 59: Installation Of Electric Auxiliary Heat Module

    2. Install the converter control board to the Installation Of Electric Auxiliary supporter. Heat Module (Optional) 1. Control logic Then the heater would act automatically according to the follow control logic unless press the “Aux heater” again to inactive the heater ; Aux Heater function will activated with following 3 conditions all are met at the same time: (Must be On heat mode and not on the defrost period):...
  • Page 60 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 61: Display Function

    1. Display Function Duct Type  Product Features ...

  • Page 62: 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 63: Basic Functions

    3. Basic Functions Table Functions Auto mode Cases Case 1 Case 2 Case 3 9k~55k 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 64: 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 65: 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 66: 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 67: 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 68: Optional Functions

    4. Optional Functions Electrical energy consumption control function(Multi-Zone Systems do not Silence(Multi-Zone Systems have this function) have this function) Press the “Gear” button on remote controller to enter the • Press “Silence” or keep pressing Fan button for more energy efficient mode in a sequence of following: than 2 seconds on the remote control to enable the SILENCE function.

  • Page 69: Lcd Wired Remote Controller

    5. LCD Wired Remote Controller LCD Wired Remote Controller KJR-120L(R2)/EFU1 The KJR-120L(R2)/EFU1 wired remote controller is standard for duct types. i) Buttons and Functions  Product Features ...
  • Page 70 ii) LCD Screen On some models  Product Features ...
  • Page 71 iii) Installation • Dimensions • Wiring diagram Refer to the following diagram to wire the wall-mounted remote control to the indoor unit. Indoor Unit Display Board • Installation Diagram Connect the wire from the display panel of the indoor unit to a connecting cable. Then connect the other side of the connecting cable to the remote control.
  • Page 72 If there is a connection lug at the end of shielded wire, the connection lug should be properly grounded. Putty Trap Putty Putty Trap Trap Note: DO NOT allow water to enter the remote control. Use the trap and putty to seal the wires. •...

  • Page 73: Buttons And Functions

    LCD Wired Remote Controller KJR-120N(X6)/BGEF or KJR-120N(X6W)/BGEF(Optional) The KJR-120N(X6)/BGEF or KJR-120N(X6W)/BGEF wired remote controller is optional. i) Buttons and Functions 1. FAN SPEED button 7. COPY button Used to select the fan speed. To copy timer setting of one day to another in weekly schedule setting.
  • Page 74 ii) LCD Screen °C / °F display MODE display Temperature display Room temperature display Displays the current mode,including: Relative humidity display Lock display Wireless control feature display Follow me feature display Breeze away display Delay off display Turbo feature display ECO feature display Purify feature display Filter reminder display...
  • Page 75 iii) Installation • Dimensions 20.6mm 120mm 46mm 60mm 1) Connection • Wire with the indoor unit: 60mm Wiring hole HA HB • 1: Indoor Unit. • 2: Notch the part for the wiring to pass through with a nipper tool. •...
  • Page 76 Indoor Unit HA HB Wired Controller 1 Wired Controller 2 For some units, one wired controller can support multiple units (a maximum of 16 units). In this case, the wired controller and unit need to be connected to the HA and HB ports at the same time. In group control, there will be no error displayed on the wired controller Indoor Unit 1 Indoor Unit 2...
  • Page 77 Reattach the upper part of the wired controller After adjusting the upper case and then buckle the upper case; avoid clamping the wiring during installation.  Product Features ...
  • Page 78 Centralized Controller 1) Connection For Light commercial air conditioner with XYE port, it can be directly connected to Centralized Controller (CCM03, CCM09). 2) Address setting When setting the address, please make sure the unit is powered off. The address can be set from 0 to 63 by the switch. Turn on the unit, then the address will be effective.
  • Page 79 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 80: Troubleshooting

    Troubleshooting Contents 6.10 PC03(Pressure protection (low or high pressure) Diagnosis and Solution) ....32 6.11 PC02(Compressor top (or IPM) temp. protection Diagnosis and Solution) ....35 6.12 PC0L (Low ambient temperature protection) ............. 36 6.13 EHb3 (Communication malfunction between wire and master control) Diagnosis and Solution 37 6.14 EHbA(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 81: 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 82: 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 83: Error Display On Two Way Communication Wired Controller

    IDU & ODU communication error TS20 EL01 System lacks refrigerant TS27 EL0C Communication malfunction between main unit and secondary units TS41 EL11 Refrigerant sensor error TS39 FHCC ODU IPM module protection TS29 PC00 ODU voltage protection TS30 PC01 Compressor top (or IPM) temp. protection TS35 PC02 Pressure protection (low or high pressure) (for some models)

  • Page 84: 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 85 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 Phase failure of indoor external fan EH35...
  • Page 86 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 PC45 Compressor speed malfunction PC46 Compressor over current protection PC49 Compressor discharge temperature protection...

  • Page 87: 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 88 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 89 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 90: 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 91: 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 92 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 93 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 94 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 95 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 96: 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 97: 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 98: 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 99 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 100 485 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 101: 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 102 Index: 1.Indoor DC Fan IPM Board For Low-Static Duct Units: Port Description Parameter Remark CON1 Power input for the PCB 230V/AC Communication with main PCB Test port 5V/DC For debugging board CN23 UVW output for DC fan motor CON2 Ports for reactor CN1 Communication with main PCB Signal Voltage...
  • Page 103 Port Description Parameter Remark CN15 Power input for the PCB 230V/AC L, N and Earth CN13 Communication with main PCB Test port 5V/DC For debugging board CN20 UVW output for DC fan motor CN18L Ports for reactor CN13 Communication with main PCB Signal Voltage +15V...

  • Page 104: 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 105: 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 106: 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 Power off, then restart the unit 2 minutes later.

  • Page 107: 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 108: 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 109: 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 110: 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 111 High pressure protection Are the high pressure switch Connect high pressure switch and main control boar wired and mian control board correctly? Is the high pressure protector broken? Method: Disconnect the plug. Measure the resistance of the high pressure Replace high pressure protector protector, if the protector is normal the value is o, Does a problem still exist?
  • Page 112 Low pressure protection Are the low pressure Reconnect the low pressure protector and main control protector and main control board board wired properly? Is the low pressure protector broken? Method: Disconnect the plug. Measure the resistance of the low pressure Replace low pressure protector protector.

  • Page 113: Pc02(Compressor Top (Or Ipm) Temp. Protection Diagnosis And Solution)

    6.11 PC02(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. Models without overload protector should be diagnosed according to the second flowchart.

  • Page 114: 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 115: Ehb3 (Communication Malfunction Between Wire And Master Control) Diagnosis And Solution

    6.13 EHb3 (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 116: Ehba(Communication Error Between The Indoor Unit And The External Fan Module)/Eh3A

    6.14 EHbA(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 117: 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 118: 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 119: 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 120: 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 121 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 122 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 123 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 124 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 125 422.31 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 126 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. High-Static Concealed Duct Service Manual: SM_A7 Duct(GA)_R454B_3D INV_US1_NA_2402...

This manual is also suitable for:

Aciq-12cd-hh-mcAciq-18cd-hh-mcAciq-24cd-hh-mcAciq-36cd-hh-mcAciq-48cd-hh-mcAciq-60cd-hh-mc

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