Page 2 - Ceiling Cassette Air Conditioner; TABLE OF CONTENTS; Table of contents
2 Ceiling Cassette Air Conditioner TABLE OF CONTENTS Table of contents Page 1. Safety Precautions ...........................................................................................................3 2. Feature & Benefits ......................................................................
Page 3 - Service Manual 3; Safety Precautions; This symbol indicates the possibility of death or serious injury.; Installation; Be sure to follow the instruction.; Safety Presautions
Service Manual 3 Safety Precautions To prevent injury to the user or other people and property damage, the following instructions mustbe followed. ■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness isclassified by the following indications. ■ Meanings of sym...
Page 4 - Ceiling Cassette Air Conditioner; Operational
4 Ceiling Cassette Air Conditioner ■ Operational Do not install, remove, or re-install the unit by yourself(customer). • There is risk of fire, electric shock, explosion, or injury. Be cautious when unpackingand installing the product. • Sharp edges could cause injury. Be especially careful of the c...
Page 5 - Service Manual 5; Gasolin
Service Manual 5 ■ Installation Do not open the inlet grill of the product duringoperation. (Do not touch the electrostatic filter,if the unit is so equipped.) • There is risk of physical injury, electric shock, or prod- uct failure. Be cautious that water could not enter theproduct. • There is risk...
Page 6 - Ceiling Cassette Air Conditioner; Keep level even when installing the product.; Wa
6 Ceiling Cassette Air Conditioner Keep level even when installing the product. • To avoid vibration or water leakage. Use two or more people to lift and transportthe product. • Avoid personal injury. Use a soft cloth to clean. Do not use harshdetergents, solvents, etc. • There is risk of fire, elec...
Page 7 - Service Manual 7; Environment Friendly Refrigerant :; Plasma Air Purifier :
Service Manual 7 Features & Benefits Environment Friendly Refrigerant : - LG Ceiling Cassette Air Conditioners uses environ- ment friendly refrigerant, which don't do any harm tothe environment. Plasma Air Purifier : - It removes not only microscopic contaminants & dust, but also house mites...
Page 8 - Ceiling Cassette Air Conditioner; Swirl Swing; Space Control; Auto Restart Operation :
8 Ceiling Cassette Air Conditioner Swirl Swing - It is the function for comfort cooling/heating operation. - The diagonal two louvers are opened the more larger than the other louvers.After one minute, it is opposite. Space Control Vanes angle can be controlled by pair, considering itsinstallation e...
Page 9 - Service Manual 9; High Ceiling Operation; Selection Height
Service Manual 9 Features & Benefits High Ceiling Operation - According to the height of ceiling installation, it pro- vides variability of indoor fan motor rpm. If the heightof installation is low then you can adjust low rpm ofindoor fan motor. On the other hand if the height ofthe installation...
Page 10 - • Ceiling Cassette; List of Functions
10 Ceiling Cassette Air Conditioner List of Functions • Ceiling Cassette List of Functions Air supply outletAirflow direction control (left & right)Airflow direction control (up & down)Auto swing (left & right) Air flow Auto swing (up & down)Airflow steps(Fan / Cool / Heat)CHAOS swin...
Page 11 - Wireless LCD Remote Control; Function of Remote Control; Operation Mode
Service Manual 11 Function of Remote Control 1. Wireless LCD Remote Control Function of Remote Control Cooling Operation Auto Operation Healthy Dehumidification Operation Operation Mode ON OFF CANCEL SET ° C/ ° F AUTO CLEAN 1 3 5 4 9 10 12 18 16 7 2 8 13 15 11 6 Flip-up door(opened) Signal transmitt...
Page 12 - Wired LCD Remote Control
12 Ceiling Cassette Air Conditioner Function of Remote Control Timer Cancel 2ndF Program Week Hour Min Holiday Set/Clr RESET Plasma Operation unit Humidify AUTO SWING OPERATION FAN SPEED Program set SUB FUNCTION SET TEMP Room Temp HIMEDLO HeaterDefrostFilter Preheat Out door Time Timer OnSet no. Tim...
Page 13 - Specifications
Service Manual 13 Specifications Specifications Note :1. Capacities are based on the following conditions: Cooling: - Indoor Temperature 26.7°C(80°F) DB /19.4°C(67°F) WB - Outdoor Temperature 35°C(95°F) DB /23.9°C(75°F) WB Piping Length - Interconnecting Piping Length 7.5m(25ft) - Level Difference o...
Page 15 - Dimensional Drawings
Service Manual 15 225(8.9) 950(37.4) 950(37.4) 840(33.1) 7 76(3.0) 135(5.3) 4 5 225(8.9) 6 806(31.7) 840(33.1) 840(33.1) 688(27.1) 950(37.4) 30(1.18) 950(37.4) R35(1.4) 3 2 1 900(35.4) (ceiling opening) 688(27.1) (hanging bolt) 840(33.1) 900(35.4) (ceiling opening) 950(37.4) 806(31.7) (hanging bolt)...
Page 18 - Wiring Diagrams
18 Ceiling Cassette Air Conditioner Wiring Diagrams 1. Indoor Unit DMC24CA-1 / DMC36CA-1 Wiring Diagrams Connector Number Location CN-POWER AC power supply CN-MOTOR BLDC fan motor output CN-DPUMP Drain pump output CN-DISP Display CN-FLOAT Float switch input CN-REMO Remote control CN-CC Dry-contact C...
Page 20 - Cooling Only Models; Refrigerant Cycle Diagrams
20 Ceiling Cassette Air Conditioner Refrigerant Cycle Diagrams 1. Cooling Only Models INDOOR UNIT H/EX LIQUID SIDE Gas Side GAS SIDE Capillary Tube OUTDOOR UNIT Thermistor(Air) E.E.V. Accumulator Heat Exchanger Check Valve Constant Compressor 1 Constant Compressor 2 Check Valve Thermistor Thermistor...
Page 21 - Sunr; Sunr; Select the best location
Service Manual 21 Installation More than30cm(11.8inch) Fence or obstacles Sunr oof Fence or obstacles Sunr oof More than 50cm(19.7inch) (Service space) More than30cm(11.8inch) More than 50cm(19.7inch) More than 70cm(27.6inch) More than 50cm(19.7inch) More than 100cm(39.4inch) More than 50cm(19.7inch...
Page 22 - Settlement of outdoor unit; Indoor Unit Installation; CAUTION
22 Ceiling Cassette Air Conditioner Installation Bolt Tubing connection 2. Settlement of outdoor unit • Anchor the outdoor unit with a bolt and nut(ø10mm(0.39inch)) tightly and horizontally on aconcrete or rigid mount. • When installing on the wall, roof or rooftop, anchor the mounting base securely...
Page 23 - WARNING; • Cooling & Heating type
Service Manual 23 Installation 4. Wiring Connection Make sure that the screws of the terminal are free from looseness. WARNING 1. All wiring must comply with local and national electrical codes. 2. Select a power source that is capable of supplying the current as required by the air conditioner. 3. ...
Page 24 - Installation of Decoration Panel
24 Ceiling Cassette Air Conditioner Installation 5. Installation of Decoration Panel 1. Temporarily fix two decoration panel fixing screws (hexagon M5 screw) on the unit body. (Tighten by amount 10mm(0.39inch) in length.)The fixing screws (hexagon M5 screw) are included the indoor unit box. 2. Remov...
Page 25 - Heat Insulation and pipings; HEAT INSULATION; attach; FORM THE PIPINGS
Service Manual 25 Installation 6. Heat Insulation and pipings 1. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over 120°C(248°F) ). 2. Precautions in high humidity circumstance: This air conditioner has been tested according tothe "KS Standar...
Page 26 - Drain Piping of Ceiling Cassette; Tape the Piping and Connecting cable from bot-
26 Ceiling Cassette Air Conditioner Installation 7. Drain Pipe Work ■ Drain Piping of Ceiling Cassette • Drain piping must have down-slope (1/50 to 1/100): be sure not to provide up-and-down slope to prevent reversal flow. • During drain piping connection, be careful not to exert extra force on the ...
Page 27 - ) PRECAUTIONS IN TEST RUN
Service Manual 27 Installation 1) PRECAUTIONS IN TEST RUN • The initial power supply must provide at least 90% of the rated voltage. Otherwise, the air conditioner should not be operated. For test run, carry out the cooling operation first even during winter season.Carry out the test run more than 5...
Page 28 - ) Connection of power supply
28 Ceiling Cassette Air Conditioner Installation Thermometer 2) Connection of power supply 1. Connect the power supply cord to the independent power supply.• Circuit breaker is required. 2. Operate the unit for fifteen minutes or more. 3) Evaluation of the performance 1. Measure the temperature of t...
Page 29 - Optional Operation; ) Two Thermistor System
Service Manual 29 Installation 9. Optional Operation 1) Two Thermistor System (1) Open the rear cover of the wired remote-controller to set the mode.(2) Select one of three selectable modes as follows. • Position 1: The room themperature is controlled by the thermistor of the wired remote-controller...
Page 30 - ) Adjusting air volume to the height of ceiling; Procedure
30 Ceiling Cassette Air Conditioner Installation 2) Adjusting air volume to the height of ceiling You can choose the RPM(or air volume) of indoor motor according to the height of ceiling to supply the com-fortable atmosphere to consumers. Procedure 1. Choose the selectable position in the table afte...
Page 31 - Trouble analysis; Cycle Troubleshooting Guide; Troubleshooting Guide
Service Manual 31 Troubleshooting Guide Trouble analysis 1. Check temperature difference between intake and discharge air, and operating current. All amount of refrigerant leaked out. Check refrigeration cycle. Refrigerant leakageClog of refrigeration cycleDefective compressor Excessive amount of re...
Page 32 - Electronic Parts Troubleshooting Guide; The Product doesn’t operate at all.; Trouble 1
32 Ceiling Cassette Air Conditioner Troubleshooting Guide Electronic Parts Troubleshooting Guide The Product doesn’t operate at all. Turn off the main power and wait until LED on outdoor PCB is off Turn on the main power again. Does the Operating LED of indoor unit blink When Operation's ON? Refer t...
Page 33 - Product doesn't operate with the remote controller.; Trouble 2
Service Manual 33 Troubleshooting Guide Turn on main power. While the compressor has been stopped, the compressor does not operate owing to the delaying function for 3 minutes after stopped. When the compressor stopped Indoor Fan is driven by a low speed. At this point the wind speed is not controll...
Page 34 - When cooling does not operate
34 Ceiling Cassette Air Conditioner Troubleshooting Guide When cooling does not operate Trouble 3 Turn on Main Power Operate "Cooling Mode( )" by setting the desired temperature of theremote controller to at least 1°C (1.8ºF) below room temperature . When in Air Circulation Mode, Compressor/...
Page 35 - When indoor Fan does not operate
Service Manual 35 Troubleshooting Guide When indoor Fan does not operate Trouble 4 Check the SSR high speed operation by remote control. (The Indoor Fan Motor is connected) Turn off Main power Check the connection of CN-FAN or CN-MOTOR Check the Fan Motor Check the Fuse(AC250V/T2A) Turn ON Main Powe...
Page 36 - When Vertical Louver does not operate
36 Ceiling Cassette Air Conditioner Troubleshooting Guide • Confirm that the Vertical Louver is normally geared with the shaft of Stepping Motor. • If the regular torque is detected when rotating the Vertical Louver with hands Normal • Check the connecting condition of CN-U/D Connector• Check the so...
Page 37 - Error Indicator; Self-diagnosis Function; Indoor Error
Service Manual 37 Troubleshooting Guide ■ Error Indicator • The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble.• Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table.• If more than two tr...
Page 38 - Display; Check Point
38 Ceiling Cassette Air Conditioner Troubleshooting Guide Ω 10k Ω Check the resistance Check the voltage V 2.5Vdc 01 02 06 Indoor air sensor Indoor inlet pipe sensor Indoor outlet pipe sensor • Open / Short• Soldered poorly• Internal circuit error • Open / Short• Soldered poorly• Internal circuit er...
Page 39 - Troubleshooting CH03
Service Manual 39 Troubleshooting Guide Troubleshooting CH03 Check the Volt. Indoor Unit V 12Vdc 12V S GND Check the Volt. Wired R/C V 12Vdc 12V S GND 03 Communication Wired R/C • Open / Short• Wrong connection • Connection of wire • Main PCB Volt. DC12V• Noise interference Display code Title Cause ...
Page 40 - Troubleshooting CH04; Check the resistance
40 Ceiling Cassette Air Conditioner Troubleshooting Guide Troubleshooting CH04 Check the resistance Ω 0 Ω CN Float 04 Drain pump / Float switch • Float switch Open. (Normal : short) • The connection of wire(Drain pump/ Float switch) • Drain pump power input. (220V)• Drain tube installation.• Indoor ...
Page 47 - Service Manual 47
Service Manual 47 (3-way) Valve (3-way) Valve 3-way Valve (Liguid Side) 3-way Valve (Gas Side) Works Shaft position Shaft position Service port Shipping Closed Closed Closed (with valve cap) (with valve cap) (with cap) Air purging Open Closed Open (Installation) (counter-clockwise) (clockwise) (push...
Page 48 - 8 Ceiling Cassette Air Conditioner
48 Ceiling Cassette Air Conditioner (3-way) Valve • Procedure For pumping down,firstly short the Low Pressures/w at the outside and then operate below proce-dure.1. Confirm that both the gas side and liquid side valves are set to the open position. - Remove the valve stem caps and confirm that the v...
Page 49 - Service Manual 49; • Procedure; Vacuum pump
Service Manual 49 (3-way) Valve (2) Evacuation (All amount of refrigerant leaked) • Procedure 1. Confirm that both the liguid side valve and gas side valve are set to the opened position. 2. Connect the vaccum pump to the center hose of the manifold gauge. 3. Connect the service port of the gas side...
Page 50 - 0 Ceiling Cassette Air Conditioner; Connect the gauge to the charging cylinder.
50 Ceiling Cassette Air Conditioner (3-way) Valve (3) Gas Charging (After Evacuation) • Procedure 1. Connect the gauge to the charging cylinder. - Connect the charge hose which you disconnect- ed from the vacuum pump to the valve at thebottom of the cylinder. - If you are using a gas cylinder, also ...
Page 51 - Electronic Control Device
Service Manual 51 Electronic Control Device Electronic Control Device • Main P.C.B ASM <Indoor> <Outdoor>
