Panasonic CS-VU9SKQ Service Manual
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Panasonic CS-VU9SKQ Service Manual

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This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to
service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.
R32 REFRIGERANT
– This Air Conditioner contains and operates with refrigerant R32.
THIS PRODUCT MUST ONLY BE INSTALLED OR SERVICED BY QUALIFIED PERSONNEL.
Refer to Commonwealth, State, Territory and local legislation, regulations, codes, installation & operation manuals, before the
installation, maintenance and/or service of this product.
R32
TEMP
iCOMFORT
REFRIGERANT
OFF/ON
SHOWER /
TEMP
DIRECT
R32
REFRIGERANT
WARNING
CAUTION
Indoor Unit
CS-VU9SKQ
CS-VU12SKQ
CS-VU18SKQ
Order No: PAPAMY1602026CE
Outdoor Unit
CU-VU9SKQ
CU-VU12SKQ
CU-VU18SKQ
Destination
Philippines
Dutch Antilles
Panama
Jamaica
Aruba
© Panasonic Corporation 2016.

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Summary of Contents for Panasonic CS-VU9SKQ

  • Page 1 – This Air Conditioner contains and operates with refrigerant R32. THIS PRODUCT MUST ONLY BE INSTALLED OR SERVICED BY QUALIFIED PERSONNEL. Refer to Commonwealth, State, Territory and local legislation, regulations, codes, installation & operation manuals, before the installation, maintenance and/or service of this product. © Panasonic Corporation 2016.

  • Page 2: Table Of Contents

    Refrigeration Cycle Diagram ......19     14.4 IPM (Power Transistor) Prevention Control75     14.5 Compressor Overheating Prevention Control   CS-VU9SKQ CU-VU9SKQ   ..............76   CS-VU12SKQ CU-VU12SKQ ..... 19   14.6 Low Pressure Prevention Control (Gas   CS-VU18SKQ CU-VU18SKQ ..... 20  ...

  • Page 3: Safety Precautions

    1. Safety Precautions  Read the following “SAFETY PRECAUTIONS” carefully before installation.  Electrical work must be installed by a licensed electrician. Be sure to use the correct rating of the power plug and main circuit for the model to be installed. ...
  • Page 4 WARNING Do not perform flare connection inside a building or dwelling or room, when joining the heat exchanger of indoor unit with interconnecting piping. Refrigerant connection inside a building or dwelling or room must be made by brazing or welding. Joint connection of indoor unit by flaring method can only be made at outdoor or at outside of a building or dwelling or room.
  • Page 5 CAUTION Do not install the unit in a place where leakage of flammable gas may occur. In case gas leaks and accumulates at surrounding of the unit, it may cause fire. Prevent liquid or vapor from entering sumps or sewers since vapor is heavier than air and may form suffocating atmospheres. Do not release refrigerant during piping work for installation, re-installation and during repairing a refrigerant parts.

  • Page 6: Precaution For Using R32 Refrigerant

    2. Precaution for Using R32 Refrigerant  The basic installation work procedures are the same as conventional refrigerant (R410A, R22) models. However, pay careful attention to the following points: WARNING Since the working pressure is higher than that of refrigerant R22 models, some of the piping and installation and service tools are special.
  • Page 7 CAUTION 2-5. No ignition sources  No person carrying out work in relation to a refrigeration system which involves exposing any pipe work that contains or has contained flammable refrigerant shall use any sources of ignition in such a manner that it may lead to the risk of fire or explosion. He/She must not be smoking when carrying out such work.
  • Page 8 CAUTION Leak detection methods  Electronic leak detectors shall be used to detect flammable refrigerants, but the sensitivity may not be adequate, or may need re- calibration. (Detection equipment shall be calibrated in a refrigerant-free area.)  Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used. ...
  • Page 9 CAUTION Labelling  Equipment shall be labelled stating that it has been de-commissioned and emptied of refrigerant.  The label shall be dated and signed.  Ensure that there are labels on the equipment stating the equipment contains flammable refrigerant. Recovery ...

  • Page 10: Specification

    3. Specification Indoor CS-VU9SKQ Model Outdoor CU-VU9SKQ Performance Test Condition Phase, Hz Single, 60 Power Supply Min. Mid. Max. Min. Mid. Max. 0.84 2.65 3.20 0.84 2.65 3.20 Capacity BTU/h 2860 9040 10900 2860 9040 10900 kJ/h 3020 9540 11520...
  • Page 11 Indoor CS-VU9SKQ Model Outdoor CU-VU9SKQ Control Device Capillary Tube Refrigeration Refrigerant Oil FW50S (320) Cycle Refrigerant Type g (oz) R32, 710 (25.1) Height (I/D / O/D) mm (inch) 280 (11-1/32) / 542 (21-11/32) Dimension Width (I/D / O/D) mm (inch)
  • Page 12 Indoor CS-VU12SKQ Model Outdoor CU-VU12SKQ Performance Test Condition Phase, Hz Single, 60 Power Supply Min. Mid. Max. Min. Mid. Max. 1.02 3.40 4.20 1.02 3.40 4.20 Capacity BTU/h 3480 11600 14300 3480 11600 14300 kJ/h 3670 12240 15120 3670 12240 15120 Running Current Input Power...
  • Page 13 Indoor CS-VU12SKQ Model Outdoor CU-VU12SKQ Control Device Capillary Tube Refrigeration Refrigerant Oil FW50S (320) Cycle Refrigerant Type g (oz) R32, 760 (26.8) Height (I/D / O/D) mm (inch) 280 (11-1/32) / 542 (21-11/32) Dimension Width (I/D / O/D) mm (inch) 950 (37-13/32) / 780 (30-23/32) Depth (I/D / O/D) mm (inch)
  • Page 14 Indoor CS-VU18SKQ Model Outdoor CU-VU18SKQ Performance Test Condition Phase, Hz Single, 60 Power Supply Min. Mid. Max. Min. Mid. Max. 1.10 5.20 5.80 1.10 5.20 5.80 Capacity BTU/h 3750 17700 19800 3750 17700 19800 kJ/h 3960 18720 20880 3960 18720 20880 Running Current Input Power...
  • Page 15 Indoor CS-VU18SKQ Model Outdoor CU-VU18SKQ Control Device Expansion Valve Refrigeration Refrigerant Oil FW50S (450) Cycle Refrigerant Type g (oz) R32, 1.00k (35.3) Height (I/D / O/D) mm (inch) 280 (11-1/32) / 619 (24-3/8) Dimension Width (I/D / O/D) mm (inch) 950 (37-13/32) / 824 (32-15/32) Depth (I/D / O/D) mm (inch)

  • Page 16: Location Of Controls And Components

    4. Location of Controls and Components Indoor Unit (Indicator) (White/Red) (White) (White) (White) nanoe-G Generator Dust Sensor • Do not touch during operation. Horizontal Airflow Direction Louver • Do not adjust by hand. Vertical Airflow Direction Louver • Do not adjust by hand. Indicator Flap Remote control receiver (Max.

  • Page 17: Dimensions

    5. Dimensions Indoor Unit <Top View> <Side View> <Side View> <Front View> Air inlet direction Air outlet direction Air inlet direction Left piping Right piping hole hole <Bottom View> <Remote Control> TEMP iCOMFORT SHOWER / OFF/ON TEMP DIRECT <Rear View> (41-61) <Remote Control Holder>...

  • Page 18: Outdoor Unit

    Outdoor Unit 5.2.1 CU-VU9SKQ CU-VU12SKQ <Top View> Space necessary for installation 67.6 (104.7) 104.9 60.5 100 mm 100 mm 1000 mm Anchor Bolt Pitch 320 × 570 2-way valve at Liquid side <Side View> (High Pressure) <Side View> <Front View> 3-way valve at Gas side (Low Pressure)

  • Page 19: Refrigeration Cycle Diagram

    6. Refrigeration Cycle Diagram CS-VU9SKQ CU-VU9SKQ CS-VU12SKQ CU-VU12SKQ INDOOR OUTDOOR LIQUID SIDE CAPILLARY TUBE STRAINER PIPE TEMP. 2-WAY SENSOR VALVE PIPE TEMP. SENSOR INTAKE INTAKE TEMP. TEMP. SENSOR SENSOR HEAT EXCHANGER HEAT EXCHANGER (EVAPORATOR) (CONDENSER) SIDE 3-WAY VALVE COMPRESSOR TEMP. SENSOR...

  • Page 20: Cs-Vu18Skq Cu-Vu18Skq

    CS-VU18SKQ CU-VU18SKQ INDOOR OUTDOOR LIQUID EXPANSION SIDE VALVE STRAINER PIPE TEMP. 2-WAY SENSOR VALVE PIPE TEMP. SENSOR INTAKE INTAKE TEMP. TEMP. SENSOR SENSOR HEAT EXCHANGER HEAT EXCHANGER (EVAPORATOR) (CONDENSER) SIDE 3-WAY VALVE COMPRESSOR TEMP. SENSOR COMPRESSOR COOLING...

  • Page 21: Block Diagram

    7. Block Diagram CS-VU9SKQ CU-VU9SKQ CS-VU12SKQ CU-VU12SKQ...

  • Page 22: Cs-Vu18Skq Cu-Vu18Skq

    CS-VU18SKQ CU-VU18SKQ...

  • Page 23: Wiring Connection Diagram

    8. Wiring Connection Diagram Indoor Unit...

  • Page 24: Outdoor Unit

    Outdoor Unit 8.2.1 CU-VU9SKQ CU-VU12SKQ SINGLE PHASE POWER SUPPLY TO INDOOR UNIT YELLOW (YLW) OR (C) TERMINAL BLUE (BLACK) (WHITE) (RED) BOARD REACTOR (BLU) (RED) OR (R) OR (S) TRADEMARK COMP. TERMINAL RAT2 RAT1 FUSE104 (GRY) (GRY) (15A 250V) DATA OUTDOOR AIR TEMP.
  • Page 25 8.2.2 CU-VU18SKQ YELLOW SINGLE PHASE (YLW) OR (C) POWER SUPPLY TO INDOOR UNIT BLUE (BLU) (RED) OR (R) OR (S) TERMINAL REACTOR (BLACK) (RED) (WHITE) BOARD TRADEMARK COMP. TERMINAL RAT2 RAT1 (GRY) (GRY) DATA (RED) OUTDOOR AIR TEMP. SENSOR (THERMISTOR) YLW/GRN NOISE t°...

  • Page 26: Electronic Circuit Diagram

    9. Electronic Circuit Diagram Indoor Unit...

  • Page 27: Outdoor Unit

    Outdoor Unit 9.2.1 CU-VU9SKQ CU-VU12SKQ SINGLE PHASE POWER SUPPLY TO INDOOR UNIT TERMINAL (BLACK) (WHITE) (RED) BOARD REACTOR RAT2 RAT1 (GRY) (GRY) 1/8W YLW/GRN 15.8k 1/8W 1/8W 15.0k C129 0.1μ 0.1μ 0.1μ FUSE104 (15A 250V) 1μ DATA OUTDOOR TEMP. (RED) SENSOR (15kΩ...
  • Page 28 9.2.2 CU-VU18SKQ SINGLE PHASE POWER SUPPLY TO INDOOR UNIT REACTOR TERMINAL (BLACK) (RED) (WHITE) BOARD RAT2 RAT1 (GRY) (GRY) *RY-HT1 C174 0.1μ YLW/GRN ELECTRO-MAGNETIC COIL (EXPANSION VALVE) CN-STM WHITE *RY-HT2 DATA (RED) NOISE FILTER COMMUNICATION AC-BLK 1/8W CIRCUIT CIRCUIT (BLK) FUSE3 15.8k (20A 250V)

  • Page 29: Printed Circuit Board

    10. Printed Circuit Board 10.1 Indoor Unit 10.1.1 Main Printed Circuit Board CN-DUST CN-STM1 CN-RMT CN-STM4 CN-STM6 CN-STM3 CN-RCV CN-STM5 CN-DISP CN-CLN CN-TH2 CN-SW CN-TH1 CN-FM AC303 JP1 (Random Auto Restart enable/disable)
  • Page 30 10.1.2 Indicator Printed Circuit Board CN-DISP 10.1.3 Receiver Printed Circuit Board CN-RCV 10.1.4 Connector Printed Circuit Board CN-STM601 CN-STM604 CN-STM602 CN-STM603 10.1.5 Switch Printed Circuit Board SW501 CN-501...
  • Page 31 10.1.6 High Voltage Power Supply Printed Circuit Board R6 C4 CN-1 CN-2 10.1.7 Dust Sensor Printed Circuit Board...

  • Page 32: Outdoor Unit

    10.2 Outdoor Unit 10.2.1 Main Printed Circuit Board 10.2.1.1 CU-VU9SKQ CU-VU12SKQ POWER TRANSISTOR (IPM) CN-TH CN-TANK CN-S CURRENT TRANSFORMER (CT) AC-BLK AC-WHT DATA...
  • Page 33 10.2.1.2 CU-VU18SKQ POWER TRANSISTOR (IPM) CN-TANK CN-MTR1 CN-TH1 CURRENT CN-S TRANSFORMER (CT) CN-STM AC-WHT DATA CN-MTR2 AC-BLK...

  • Page 34: Installation Instruction

    11. Installation Instruction 11.1 Select The Best Location 11.1.3 Indoor/Outdoor Unit Installation Diagram 11.1.1 Indoor Unit  Do not install the unit in excessive oil fume area Indoor/Outdoor Unit Installation Diagram such as kitchen, workshop and etc. Piping direction Attention not to bend ...

  • Page 35: Indoor Unit

    11.2 Indoor Unit 11.2.1 How to Fix Installation Plate The mounting wall shall be strong and solid enough to prevent if from the vibration. Wall Wall Wall More than More than More screw than Indoor unit 80 mm 128 mm 151 mm 127 mm Measuring...

  • Page 36: Indoor Unit Installation

    11.2.3 Indoor Unit Installation Do not turn over the unit without it’s shock absorber during pull out the piping. It may cause front panel damage. Use shock absorber during pull out the piping to protect the front panel from damage. Piping Piping Front panel...
  • Page 37 Replace the drain hose Rear view for left piping installation Connection cable PIPE HOLE CENTER 80mm TO HOLE CENTER More than 1050 mm Piping (1.0 ~ 2.0HP) Drain hose Drain hose Connection Drain hose Drain cap cable Sleeve for piping hole Adjust the piping slightly downwards •...

  • Page 38: Connect The Cable To The Indoor Unit

    11.2.4 Connect the Cable to the Indoor Unit 1. The inside and outside connection cable can be connected without removing the front grille. 5. Connection cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 4 × 1.5 flexible cord, type designation 60245 IEC 57 or heavier cord.
  • Page 39 RISK OF FIRE JOINING OF WIRES MAY CAUSE WARNING OVERHEATING AND FIRE. Do not joint wires Use complete wire without joining. Use approved socket and plug with earth pin Wire connection in this area must follow to national wiring rules. 11.2.4.2 Cutting and flaring the piping Please cut using pipe cutter and then remove the burrs.

  • Page 40: Outdoor Unit

    11.3 Outdoor Unit 11.3.1 Install the Outdoor Unit  After selecting the best location, start installation to Indoor/Outdoor Unit Installation Diagram. 1. Fix the unit on concrete or rigid frame firmly and horizontally by bolt nut (ø10 mm). 2. When installing at roof, please consider strong wind and earthquake. Please fasten the installation stand firmly with bolt, screws or nails.

  • Page 41: Evacuation Of The Equipment

    AIR PURGING METHOD IS PROHIBITED FOR R32 SYSTEM 11.3.3 Evacuation of the Equipment WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the following procedure. Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation. There is no extra refrigerant in the outdoor unit for air purging.

  • Page 42: Connect The Cable To The Outdoor Unit

    11.3.4 Connect the cable to the Outdoor Unit 1. Remove the control board cover from the unit by loosening the screw. 2. Cable connection to the power supply through Isolating Devices (Disconnecting means).  Connect approved type polychloroprene sheathed power supply cord 3 × 1.5 mm (1.0 ~ 1.5HP) or 3 ×...

  • Page 43: Piping Insulation

    11.3.5 Piping Insulation 1. Please carry out insulation at pipe connection portion as mentioned in Indoor/Outdoor Unit Installation Diagram. Please wrap the insulated piping end to prevent water from going inside the piping. 2. If drain hose or connecting piping is in the room (where dew may form), please increase the insulation by using POLY-E FOAM with thickness 6 mm or above.

  • Page 44: Installation And Servicing Air Conditioner Using R32

    12. Installation and Servicing Air Conditioner using R32 12.1 About R32 Refrigerant For air conditioning refrigerants such as R410A, the refrigerants were collected back in order to prevent their air dissipation, to curbe the global warming impact, in case they were released into the atmosphere. In the “4th Environmental Basic Plan”, 80% reduction of greenhouse gas emissions by 2050 is required, and due to this requirement, further reduction in the emission of high greenhouse effect gas, such as CFCs, is required.
  • Page 45 2. Characteristic of Pressure As shown in Table 2, R32 does not have much difference in vapor pressure at the same refrigerant temperature comparing to R410A, but comparing to R22, it is higher at 1.6 times more. Thus, the same as in case of R410A, it is necessary to do installation and service using high-pressure tools and components.

  • Page 46: Refrigerant Piping Installation • Tools Used In Services

    12.3 Refrigerant piping installation • Tools used in services 12.3.1 Required Tools R32 refrigerant air conditioners use the common parts as R410A air conditioners for two-way valves and three-way valves (diameters of service ports); thus, they maintain commonality in the maintenance of the compressive strength, the size of pipe flaring, and the size of flare nuts as R410A.
  • Page 47 3. Torque wrenches (diameters 1/2, 5/8) Manifold gauges / Charging hoses In order to strengthen the compressive strength, the diameters of wrenches change depending on the flare nut sizes. Torque wrenches Differences in charging hoses Differences in torque wrenches (common R410A) Normal 5.1 MPa 3.4 MPa...
  • Page 48 7. HFC refrigerant_Electric gas leakage tester 9. Refrigerant cylinders R32 refrigerant is often used for other mixed Refrigerant cylinders for R410A are painted in pink, refrigerant (R410A, R404A, R407C etc.). Therefore, and the ones for R32 are painted in other colors that the usage of existing HFC detectors is possible, but in might subject to change according to the international order to detect more accurately, we recommend to...
  • Page 49 11. Tools used for refrigerant piping installations and services Tools for R410A Common with R32 Possibility of usage for R22 ○ ○ Pipe cutters, reamers or scrapers ○ ○ Flare tools (clutch type) ○ ○ Torque wrench (1/4, 3/8) ○ ×...

  • Page 50: New Installation, Relocation, Repairing Of Refrigerant Cycle System The Procedures

    12.4 New installation, Relocation, Repairing of Refrigerant Cycle System The Procedures Relocation Repairing refrigerant cycle Installation Indoor / outdoor units and piping Pump down Refrigerant recovery • Displacing pipes and wires, and displacing indoor / outdoor units Prevention of impurity •...

  • Page 51: Piping Installation Of R32

    12.5 Piping installation of R32 12.5.1 Pipe materials used and flaring Copper pipes are used for refrigerant piping. Pipes Pipe thickness which comply with JIS Regulations need to be used. Room air conditioners which use R410A and R32 O and OL materials Thickness (mm) have higher pressure;...

  • Page 52: Installation, Relocation, And Service

    12.6 Installation, Relocation, and Service 12.6.1 Air purge and gas leak test for new installation (using new refrigerant pipes) using vacuum pump (From the point of view of global environment protection, do not release CFCs into the atmosphere during installation work) 1.
  • Page 53 12.6.2 Process of refrigerant recovery 1. Connect the center charging hose of manifold gauge to the in-let side of recovery device. 2. Connect the valves of the discharge side of recovery device and liquid side of refrigerant cylinder with red hose (charging hose).
  • Page 54 12.6.3 Relocation 1. Removing the air conditioning unit a) Recovery of outdoor unit refrigerant by pumping down Press “forced cooling button” (as a general rule, since 1998 the name of cooling testing button is changed, and this name is unified within the air conditioning industry), and then you are able to start cooling operation in which the room temperature is low, and you can recover the refrigerant from the outdoor unit.
  • Page 55 12.6.6 Re-insertion of refrigerant in service When re-insertion is needed, follow the procedures to ensure the insertion of new refrigerant at correct amount. 1. Attach charging hose (blue) to the service port of the outdoor unit. 2. Attach charging hose (red) to the vacuum pump. Fully open the 2-way and 3-way valves. 3.

  • Page 56: Repairing Of Refrigerant Cycle / Brazing Point

    12.7 Repairing of refrigerant cycle / Brazing point 12.7.1 Preparation for repairing of refrigerant cycle / brazing Brazing which is a technique needed for repairing refrigerant cycle requires advanced technique and experience, and this brazing procedure can only be performed by the workers who completed “Gas Welding Skill Training” regulated by the Occupational Safety and Health Act, and went through the training programs of refrigerant operations.
  • Page 57 2. Cylinder without adjustment valve side gauge pressure is adjusted by the adjuster. Check the both side valves of the torch and open the cylinder valve to check the remaining refrigerant in the cylinder. Caution: Do not attach oil component on the connection port of the adjuster. Especially, use an oxygen cylinder adjuster which is no oil substance type.
  • Page 58 12.7.5 Types of flame Types of flame change based on the proportion of propane and oxygen. [Neutral Flame] Perform brazing with this flame (This is a flame when oxygen and propane are mixed at proper proportion, and has lesser effect on the brazed metals) White core flame 10 ~ 15 mm...
  • Page 59 12.7.7 Selection of brazing material Use BAg brazing material (silver solder) to increase the welding performance. Tensile strength Composition of ingredients (%) Temperature (°C) Characteristics (Reference) Category Standard Brazing Base Number applications Solidus Liquidus Kgf•cm temp material Liquidity is good at low temperature, 49.0 14.5...
  • Page 60 12.7.10 Checking of brazing (insert) points 1. No impurity on the brazing point Gap 0.025 ~ 0.05 mm If dirt or oil is attached on the brazing point, the brazing filler metal does not reach to junction, and Inner diameter ø6.45 it may cause poor welding.
  • Page 61 (Reference) Melting temperature of copper • • • • • • • Approx. 1083°C Maximum temperature obtained in propane and oxygen • • • • • • • Approx. 1083°C The important point is to heat the bonding part uniformly within a short period of time until reaching to the brazing temperature in the following manner.

  • Page 62: Reference> Analysis Method For No Error Code, No Cooling / No Warming

    12.8 <Reference> Analysis method for no error code, no cooling / no warming 12.8.1 Preparation for appropriate diagnosis In order to obtain appropriate operation characteristics, minimum 15 minutes or more operation time [testing operation (rated operation)] is required. 1. Method of rated operation (rated operation) For the models which have two buttons of “emergency operation and forced cooling operation”, press forced cooling button once.
  • Page 63 1. Measuring temperature 1) Indoor unit suction temperature, release temperature, temperature difference, → Measure by thermometer 2) 2-way valve pipe temperature in cooling mode is low temperature (benchmark：5 ~ 10°C), in heating mode is medium temperature (benchmark：25 ~ 35°C). 3) 3-way valve pipe temperature in cooling mode is low temperature (benchmark：7 ~ 15°C) in heating mode is high temperature (benchmark：38 ~ 50°C).

  • Page 64: Operation Control

    13. Operation Control 13.1 Basic Function Inverter control, which equipped with a microcomputer in determining the most suitable operation mode as time passes, automatically adjusts output power for maximum comfort always. In order to achieve the suitable operation mode, the microcomputer maintains the set temperature by measuring the temperature of the environment and performing temperature shifting.

  • Page 65: Indoor Fan Motor Operation

    13.2 Indoor Fan Motor Operation 13.2.1 Basic Rotation Speed  Manual Fan Speed Fan motor’s number of rotation is determined according to remote control setting. Remote control ○ ○ ○ ○ ○  Auto Fan Speed According to room temperature and setting temperature, indoor fan speed is determined automatically. The indoor fan will operate according to pattern below.

  • Page 66: Airflow Direction

    13.4 Airflow Direction  There are two types of airflow, vertical airflow (directed by horizontal vane) and horizontal airflow (directed by vertical vanes).  Control of airflow direction can be automatic (angles of direction is determined by operation mode, heat exchanger temperature and intake air temperature) and manual (angles of direction can be adjusted using remote control).
  • Page 67 Cooling Zero Vane Angle SHOWER iCOMFORT/Auto (Reaches set temp.) Cooling Zero Vane Angle (Dew) * The horizontal vane angle tolerance is within +/-5 degree.

  • Page 68: Shower / Direct Operation

    13.4.2 Horizontal Airflow  Automatic airflow direction can be set using remote control; the vane swings left and right within the angles as stated below. It does not swing during fan motor stop. Operation Mode Vane Angle (°) iCOMFORT, Cooling and soft dry 65 ~ 115 ...

  • Page 69: Timer Control

    13.6 Timer Control  There are 2 sets of ON and OFF timer is available to turn the unit ON or OFF at different preset time.  If more than one timer had been set, the upcoming timer will be display and will activated in sequence. 13.6.1 ON Timer Control ON Timer 1 and ON Timer 2 can be set using remote control, where the unit with timer set will start operation earlier...

  • Page 70: Random Auto Restart Control

    13.8 Random Auto Restart Control  When the power supply is cut off during the operation of air conditioner, the compressor will re-operate within three to four minutes. There are 10 patterns to be selected randomly after power supply resumes. ...
  • Page 71  Indoor fan control During any operation mode combines with nanoe-G operation, fan speed follows respective operation mode. However, nanoe-G system enabled when fan speed ≥ 500 rpm to ensure proper negative ion distribution, nanoe-G system disabled when fan speed < 500 rpm. During nanoe-G individual operation, only Auto Fan Speed is allowed.
  • Page 72  Error detection control When nanoe-G indicator blinks, it indicates error listed below: Nanoe-G connector at main PCB open  Judgment method  During nanoe-G operation, nanoe-G connector at main PCB is opened.  Troubleshooting method  Connect the connector or stop operation to cancel the blinking. ...

  • Page 73: In-Filter Deactivation Operation

    13.11 In-filter Deactivation Operation  This operation helps to deactivate virus and bacteria on filter after the unit turned off using nanoe-G generator.  In-filter deactivation start condition nanoe-G is in ON condition before the unit is turned off either by OFF/ON button or OFF Timer. Elapsed time from previous in-filter deactivation operation is more than 24 hrs.

  • Page 74: Dust Sensor Operation

    13.12 Dust Sensor Operation  Depending on the level of particles detected by the dust sensor, nanoe-G generator is optimally controlled to purify the air, thus creating a clean room environment.  This feature is automatically turned ON when unit is operated. It is turned OFF if nanoe-G is turned ON manually. ...

  • Page 75: Protection Control

    14. Protection Control 14.1 Restart Control (Time Delay Safety Control)  The compressor will not turn on within 3 minutes from the moment operation stops, although the unit is turned on again by pressing OFF/ON button at remote control within this period. ...

  • Page 76: Compressor Overheating Prevention Control

    14.5 Compressor Overheating Prevention Control  Instructed frequency for compressor operation will be regulated by compressor temperature. The changes of frequency are as below.  If compressor temperature exceeds 107°C, compressor will be stopped, occurs 4 times per 20 minutes, timer LED will be blinking.

  • Page 77: Outdoor Air Temperature Control

    14.9 Outdoor Air Temperature Control  The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the diagram below.  This control will begin 1 minute after the compressor starts.  Compressor frequency will adjust based on outdoor air temperature. Free 38°C 37°C...

  • Page 78: Odor Cut Control

    14.14 Odor Cut Control  To reduce the odor released from the unit. Start condition  AUTO FAN Speed is selected during COOL or DRY operation.  During freeze prevention control and timer preliminary operation, this control is not applicable. Control content ...

  • Page 79: Servicing Mode

    15. Servicing Mode 15.1 Auto Off/On Button Auto OFF/ON Auto OFF/ON Button Pressed Button Pressed 5 sec Emergency operation Test Run Operation Stop (iCOMFORT Operation) (Forced Cooling Operation) Beep EMERGENCY OPERATION (iCOMFORT OPERATION) MODE The Emergency operation (iCOMFORT Operation) will be activated immediately once the Auto OFF/ON button is pressed.

  • Page 80: Remote Control Button

    15.2 Remote Control Button 15.2.1 SET Button  To check remote control transmission code and store the transmission code to EEPROM. Press “Set” button by using pointer. Press “Timer Set” button until a “beep” sound is heard as confirmation of transmission code change. LCD returns to original display if remote control does not operate for 30 seconds.
  • Page 81  To limit set temperature range for iCOMFORT, COOL & DRY mode. Press “Set” button by using pointer. Press TEMP increment or decrement button to choose No. 3. Press Timer increment or decrement button to select desired temperature low limit of set temperature for iCOMFORT, COOL &...
  • Page 82 15.2.2 RESET (RC)  To clear and restore the remote control setting to factory default. Press once to clear the memory. 15.2.3 RESET (AC)  To restore the unit’s setting to factory default. Press once to restore the unit’s setting. 15.2.4 TIMER ...

  • Page 83: Troubleshooting Guide

    16. Troubleshooting Guide 16.1 Refrigeration Cycle System In order to diagnose malfunctions, ensure the air conditioner is free Normal Pressure and Outlet Air Temperature (Standard) from electrical problems before inspecting the refrigeration cycle. Gas Pressure Outlet air Temperature Such problems include insufficient insulation, problem with the (kg/cm (°C) power source, malfunction of a compressor and a fan.
  • Page 84 16.1.1 Relationship Between the Condition of the Air Conditioner and Pressure and Electric Current Cooling Mode Condition of the air conditioner Low Pressure High Pressure Electric current during operation Insufficient refrigerant    (gas leakage) Clogged capillary tube or ...

  • Page 85: Breakdown Self Diagnosis Function

    16.2 Breakdown Self Diagnosis Function 16.2.1 Self Diagnosis Function (Three Digits Alphanumeric Code)  Once error occurred during operation, the unit will stop its operation, and Timer LED blinks.  Although Timer LED goes off when power supply is turned off, if the unit is operated under a breakdown condition, the LED will ON again.

  • Page 86: Error Code Table

    16.3 Error Code Table Diagnosis Emergency Abnormality / Protection control Abnormality Judgment Primary location to verify display Operation No abnormality detected Normal operation  Internal / external cable Indoor / Outdoor abnormal > 1 min after starting Indoor fan operation connection communication operation...

  • Page 87: Troubleshooting Flowchart

    16.4 Troubleshooting Flowchart 16.4.1 H11 (Indoor/Outdoor Abnormal Communication) Malfunction Decision Conditions  During startup and operation of cooling, the data received from outdoor unit in indoor unit signal transmission is checked whether it is normal. Malfunction Caused  Faulty indoor unit PCB. ...
  • Page 88 16.4.2 H12 (Indoor/Outdoor Capacity Rank Mismatched) Malfunction Decision Conditions  During startup, error code appears when different types of indoor and outdoor units are interconnected. Malfunction Caused  Wrong models interconnected.  Wrong indoor unit or outdoor unit PCBs mounted. ...
  • Page 89 16.4.3 H14 (Indoor Intake Air Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling, the temperatures detected by the indoor intake air temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection. ...
  • Page 90 16.4.4 H15 (Compressor Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling, the temperatures detected by the outdoor compressor temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection.  Faulty sensor. ...
  • Page 91 16.4.5 H16 (Outdoor Current Transformer Open Circuit) Malfunction Decision Conditions  A current transformer (CT) is detected by checking the compressor running frequency (≥ rated frequency) and CT detected input current (less than 1.14 A) for continuously 20 seconds. Malfunction Caused ...
  • Page 92 16.4.6 H19 (Indoor Fan Motor – DC Motor Mechanism Locked) Malfunction Decision Conditions  The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor (feedback of rotation > 2550 rpm or < 50 rpm) Malfunction Caused ...
  • Page 93 16.4.7 H23 (Indoor Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling, the temperatures detected by the indoor heat exchanger temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection.  Faulty sensor.
  • Page 94 16.4.8 H25 (nanoe-G Air Purifying System Abnormal) Malfunction Decision Conditions  During standby of cooling operation, nanoe-G breakdown occurs and air conditioner stops operation. Malfunction Caused  Faulty indoor main PCB.  Faulty indoor nanoe-G power module. Troubleshooting When abnormality indication starts again For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.
  • Page 95 16.4.9 H27 (Outdoor Air Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling, the temperatures detected by the outdoor air temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection.  Faulty sensor. ...
  • Page 96 16.4.10 H28 (Outdoor Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling, the temperatures detected by the outdoor pipe temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection.  Faulty sensor. ...
  • Page 97 16.4.11 H30 (Compressor Discharge Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling, the temperatures detected by the outdoor discharge pipe temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection.  Faulty sensor.
  • Page 98 16.4.12 H33 (Unspecified Voltage between Indoor and Outdoor) Malfunction Decision Conditions  The supply power is detected for its requirement by the indoor/outdoor transmission. Malfunction Caused  Wrong models interconnected.  Wrong indoor unit and outdoor unit PCBs used.  Indoor unit or outdoor unit PCB defective.
  • Page 99 16.4.13 H97 (Outdoor Fan Motor – DC Motor Mechanism Locked) Malfunction Decision Conditions  The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor. Malfunction Caused  Operation stops due to short circuit inside the fan motor winding. ...
  • Page 100 16.4.14 H98 (Indoor High Pressure Protection) Error Code will not display (no Timer LED blinking) but store in EEPROM Malfunction Decision Conditions  The temperature detected by the indoor pipe temperature sensor is abnormal. Malfunction Caused  Clogged air filter of the indoor unit. ...
  • Page 101 16.4.15 H99 (Indoor Freeze Prevention Protection: Cooling or Soft Dry) Malfunction Decision Conditions  Freeze prevention control takes place (when indoor pipe temperature is lower than 2°C) Malfunction Caused  Clogged air filter of the indoor unit.  Dust accumulation on the indoor unit heat exchanger. ...
  • Page 102 16.4.16 F11 (Indoor Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions  When cooling operation, when indoor pipe temperature or indoor heat exchanger temperature sensor is above 45°C. Malfunction Caused  Faulty connector connection.  Faulty indoor pipe temperature sensor.  Faulty indoor main PCB.
  • Page 103 16.4.17 F90 (Power Factor Correction Protection) Malfunction Decision Conditions  During startup and operation of cooling, when Power Factor Correction (PFC) protection circuitry at the outdoor unit main PCB senses abnormal high DC voltage level. Malfunction Caused  DC voltage peak due to power supply surge. ...
  • Page 104 16.4.18 F91 (Refrigeration Cycle Abnormality) Malfunction Decision Conditions  During cooling, compressor frequency = Fcmax.  During cooling and heating operation, running current: 0.65 A < I < 1.65 A.  During cooling, indoor intake - indoor pipe < 4°C. Malfunction Caused ...
  • Page 105 16.4.19 F93 (Compressor Rotation Failure) Malfunction Decision Conditions A compressor rotation failure is detected by checking the compressor running condition through the position detection circuit. Malfunction Caused  Compressor terminal disconnect.  Outdoor PCB malfunction. Troubleshooting When F93 indication happens For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.
  • Page 106 16.4.20 F95 (Cooling High Pressure Abnormality) Malfunction Decision Conditions During operation of cooling, when outdoor unit heat exchanger high temperature data (61°C) is detected by the outdoor pipe temperature sensor. Malfunction Caused  Outdoor pipe temperature rise due to short circuit of hot discharge air flow. ...
  • Page 107 16.4.21 F96 (IPM Overheating) Malfunction Decision Conditions During operating of cooling, when IPM temperature data (100°C) is detected by the IPM temperature sensor. Malfunction Caused  IPM overheats due to short circuit of hot discharge air flow.  IPM overheats due to defective of outdoor fan motor. ...
  • Page 108 16.4.22 F97 (Compressor Overheating) Malfunction Decision Conditions During operation of cooling, when compressor tank temperature data (112°C) is detected by the compressor tank temperature sensor. Malfunction Caused  Refrigerant shortage (refrigerant leakage).  2/3 way valve closed.  Detection error due to faulty compressor tank temperature sensor. Troubleshooting When F97 indication happens For safety reason and to prevent component...
  • Page 109 16.4.23 F98 (Input Over Current Detection) Malfunction Decision Conditions During cooling operation, when an input over-current is detected by checking the input current value being detected by current transformer (CT) with the compressor running. Malfunction Caused  Over-current due to compressor failure. ...
  • Page 110 16.4.24 F99 (DC Peak Detection) Malfunction Decision Conditions During startup and operation of cooling, when inverter DC peak data is received by the outdoor internal DC peak sensing circuitry. Malfunction Caused  DC current peak due to compressor failure.  DC current peak due to defective power transistor (IPM).

  • Page 111: Disassembly And Assembly Instructions

    17. Disassembly and Assembly Instructions Be sure to disconnect the power plug from the outlet before disassembly or repair of the unit. High Voltage is generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged sufficiently before proceeding with repair work. Failure to observe this warning could result in electric shock.
  • Page 112 17.1.2 To Remove the Air Filter 1. Perform “16.1.1 To Open Intake Grille”. 2. Put your fingers at the hook on Ensure indicator flap is closed. Detach the intake grille with fingers by pulling the intake grille louver to downwards. The intake grille hinge is firmly hang to the chassis of the unit of the air filter and pull the filter towards you to remove it.
  • Page 113 17.1.4 To Remove Dust Sensor Dust Sensor cover Dust Sensor case Screw Pull Electronic Controller 1. Pull to unhook and remove the dust sensor cover. 2. Remove the particular piece (Dust Sensor case) by remove the screw. 3. Detach the connector. 4.
  • Page 114 17.1.6 To Remove Indicator Flap and Electronic Controller (Indicator) Hook Drain Pan Indicator Flap Particular Piece Indicator Flap 1. Detach 1 connector from electronic controller (Indicator). 2. Release the tab and remove the electronic controller (Indicator) by detach the connector. Release the tab and pull the electronic controller out.
  • Page 115 17.1.8 To Remove Electronic Controller (Auto OFF/ON) Electronic Controller Particular Piece 1. Detach 1 connector from electronic controller (Auto OFF/ON). 2. Release the tab and remove.
  • Page 116 17.1.9 To Remove Electronic Controller (Main) Control Board Cover CN-DUST Control Board Casing CN-STM1 CN-RMT CN-STM4 CN-STM6 CN-STM3 CN-RCV Pull Electronic CN-STM5 Controller CN-DISP CN-CLN CN-TH2 CN-SW Earth Wire Screw CN-TH1 CN-FM Control Board Casing Terminal Wire Screw AC303 Power Supply Line 1.
  • Page 117 17.1.10 To Remove Discharge Grille and Electronic Controller (Connector) Screw Electronic Controller Screw Discharge Grille 1. Detach connectors from lead wire complete (CN-STM601). 3 connectors from electric controller (Connector). 2. Remove the discharge grille by releasing the 3 tabs. 3. Unscrew the 4 mounting screws to remove discharge grille. 17.1.11 To Remove Gear Complete Gear Complete Discharge Grille...
  • Page 118 17.1.13 To Remove Drain Pan Drain Hose Drain Pan Stepping Motor Pull Screw Screw 1. Unscrew the 4 mounting screws from the drain pan (2 screws) and stepping motor (2 screws). Pull the drain pan downward and dismantle gently. 17.1.14 To Remove Control Board Screw Control Board 1.

  • Page 119: To Remove Cross Flow Fan And Indoor Fan Motor

    17.1.15 To Remove Cross Flow Fan and Indoor Fan Motor Fan Motor Cross Flow Fan 70° Screw Pull Evaporator In line Pull Bearing Evaporator 1. Loosen the mounting screw (1 screw) which fixes the cross flow fan to indoor motor. 2.
  • Page 120 17.1.16 To Remove Evaporator Evaporator Chassis Back Cover Chassis Pull Screw 1. Unhook back cover chassis. 2. Unscrew 4 mounting screws which fixes the evaporator to chassis. Pull the evaporator out.

  • Page 121: Outdoor Electronic Controller Removal Procedure

    17.2 Outdoor Electronic Controller Removal Procedure 17.2.1 CU-VU9SKQ CU-VU12SKQ Caution! When handling electronic controller, be careful of electrostatic discharge. 1. Remove 5 screws of the Top Panel. Screws Top Panel Screw Screws Fig.1 2. Remove the 6 screws of the Front Panel. Screws Front Panel Screws...
  • Page 122 3. Remove the screw of the Terminal Board Cover. 4. Remove the Top Cover of the Control Board by 2 hooks. Hooks Top Cover Control Board Terminal Board Cover Screw Fig.3 Remove fan motor connector & 4 connectors from electronic controller Remove 1 screw Remove 2 screws Remove 2 connectors...
  • Page 123 17.2.2 CU-VU18SKQ Caution! When handling electronic controller, be careful of electrostatic discharge. 1. Remove the 5 screws of the Top Panel. 5. Remove the Control Board as follows. Fig.1 Fig.4 2. Remove the 8 screws of the Front Panel. Fig.2 3.

  • Page 124: Technical Data

    18. Technical Data 18.1 Operation Characteristics 18.1.1 CS-VU9SKQ CU-VU9SKQ  Cooling Characteristic Room temperature: 27°C (DBT), 19°C (WBT) Operation condition: High fan speed Piping length: 5.0 m Compressor Frequency = Fc 220V 230V 3.600 3.380 3.160 2.940 2.720 2.500 Outdoor Air Temperature (°C)
  • Page 125  Piping Length Characteristic Room temperature: 27°C (DBT), 19°C (WBT) Operation condition: High fan speed Outdoor temperature: 35°C (DBT), 24°C (WBT) Compressor Frequency = Fc 220V 230V 3.100 3.000 2.900 2.800 2.700 2.600 Piping Length (m) 220V 230V 1.100 1.096 1.092 1.088 1.084...
  • Page 126 18.1.2 CS-VU12SKQ CU-VU12SKQ  Cooling Characteristic Room temperature: 27°C (DBT), 19°C (WBT) Operation condition: High fan speed Piping length: 5.0 m Compressor Frequency = Fc 220V 230V 4.500 4.300 4.100 3.900 3.700 3.500 Outdoor Air Temperature (°C) 220V 230V 1.000 0.992 0.984 0.976...
  • Page 127  Piping Length Characteristic Room temperature: 27°C (DBT), 19°C (WBT) Operation condition: High fan speed Outdoor temperature: 35°C (DBT), 24°C (WBT) Compressor Frequency = Fc 220V 230V 4.100 4.020 3.940 3.860 3.780 3.700 Piping Length (m) 220V 230V 1.000 0.994 0.988 0.982 0.976...
  • Page 128 18.1.3 CS-VU18SKQ CU-VU18SKQ  Cooling Characteristic Room temperature: 27°C (DBT), 19°C (WBT) Operation condition: High fan speed Piping length: 5.0 m Compressor Frequency = Fc 220V 230V 8.100 7.680 7.260 6.840 6.420 6.000 Outdoor Air Temperature (°C) 220V 230V 0.970 0.954 0.938 0.922...
  • Page 129  Piping Length Characteristic Room temperature: 27°C (DBT), 19°C (WBT) Operation condition: High fan speed Outdoor temperature: 35°C (DBT), 24°C (WBT) Compressor Frequency = Fc 220V 230V 7.100 6.880 6.660 6.440 6.220 6.000 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Piping Length (m) 220V 230V...

  • Page 130: Exploded View And Replacement Parts List

    19. Exploded View and Replacement Parts List 19.1 Indoor Unit 26 27 TEMP iCOMFORT SHOWER / OFF/ON TEMP DIRECT Note The above exploded view is for the purpose of parts disassembly and replacement. The non-numbered parts are not kept as standard service parts.
  • Page 131 SAFETY REF. NO. PART NAME & DESCRIPTION CS-VU9SKQ CS-VU12SKQ CS-VU18SKQ REMARK CHASSIS ACXD50-00070 ← ← AIR GUIDER C.F. ASSY ACXD30K00010 ← ← EVAPORATOR COMPLETE ACXB30C00650 ACXB30C00660 ACXB30C00890 FLARE NUT (LIQUID) CWT251048 ← ← FLARE NUT (GAS) CWT251049 CWT251073 ← BACK COVER CHASSIS ACXD93-00550 ←...
  • Page 132 SAFETY REF. NO. PART NAME & DESCRIPTION CS-VU9SKQ CS-VU12SKQ CS-VU18SKQ REMARK FRONT GRILLE-COMPLETE ACXE10C00540 ← ← GRILLE DOOR - COMPLETE ACXE14C00020 ← ← SCREW - FRONT GRILLE COMPLETE XTT4+12CFJ ← ← HORIZONTAL VANE - COMPLETE ACXE24C00210 ← ← FRONT PANEL - COMPLETE ACXE13C00010 ←...

  • Page 133: Outdoor Unit

    19.2 Outdoor Unit 19.2.1 CU-VU9SKQ CU-VU12SKQ Note The above exploded view is for the purpose of parts disassembly and replacement. The non-numbered parts are not kept as standard service parts.
  • Page 134 SAFETY REF. NO. PART NAME & DESCRIPTION QTY. CU-VU9SKQ CU-VU12SKQ REMARK CHASSIS ASSY CWD52K1401 ← SOUND PROOF MATERIAL (TOP) CWG302902 ← FAN MOTOR BRACKET CWD541157 ← SCREW - FAN MOTOR BRACKET CWH551217 ← FAN MOTOR ACXA95-00130 ← SCREW - FAN MOTOR MOUNT CWH55406J ←...
  • Page 135 19.2.2 CU-VU18SKQ Note The above exploded view is for the purpose of parts disassembly and replacement. The non-numbered parts are not kept as standard service parts.
  • Page 136 SAFETY REF. NO. PART NAME & DESCRIPTION QTY. CU-VU18SKQ REMARK CHASSIS ASSY CWD52K1283 FAN MOTOR BRACKET CWD541167 SCREW - FAN MOTOR BRACKET CWH551217 FAN MOTOR L6CAYYYL0064 SCREW - FAN MOTOR MOUNT CWH55252J PROPELLER FAN ASSY CWH03K1066 NUT - PROPELLER FAN CWH56053J COMPRESSOR 9RD132XCB21...

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