Heat Controller DMC24CA-1, DMC36CA-1 User Manual 2

Ceiling Cassette Type

Single-Zone

Air Conditioning

DMC24CA-1 DMC36CA-1

Before servicing the unit, read the

“safety precautions” in this manual.

Only for authorized service personnel.

2 Ceiling Cassette Air Conditioner

TABLE OF CONTENTS

Table of contents Page

1. Safety Precautions...........................................................................................................3

2. Feature & Benefits ...........................................................................................................7

3. List of Functions.............................................................................................................10

4. Function of Remote Control...........................................................................................11

5. Specifications.................................................................................................................13

6. Dimensional Drawings ...................................................................................................15

7. Wiring Diagrams.............................................................................................................18

8. Refrigerant Cycle Diagrams...........................................................................................20

9. Installation......................................................................................................................21

10. Trouble Shooting Guide................................................................................................31

11. (3-Way)Valve................................................................................................................47

12. Electronic Control Device.............................................................................................51

Service Manual 3

Safety Precautions

To prevent injury to the user or other people and property damage, the following instructions must be followed.

■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications.

■ Meanings of symbols used in this manual are as shown below.

This symbol indicates the possibility of death or serious injury. This symbol indicates the possibility of injury or damage to properties only.

■ Installation

Be sure not to do.

Be sure to follow the instruction.

Do not use a defective or underrated circuit breaker. Use this appliance on a dedicated circuit.

• There is risk of fire or electric shock.

Always ground the product.

• There is risk of fire or electric shock.

Install the panel and the cover of control box securely.

• There is risk of fire or electric shock.

Always install a dedicated circuit and breaker.

• Improper wiring or installation may cause fire or electric shock

Use the correctly rated breaker or fuse.

• There is risk of fire or electric shock.

Do not modify or extend the power cable.

• There is risk of fire or electric shock.

Safety Presautions

4 Ceiling Cassette Air Conditioner

■ Operational

Do not install, remove, or reinstall the unit by yourself (customer).

• There is risk of fire, electric shock, explosion, or injury.

Be cautious when unpacking and installing the product.

• Sharp edges could cause injury. Be especially careful of the case edges and the fins on the condenser and evaporator.

For installation, always contact the dealer or an Authorized Service Center.

• There is risk of fire, electric shock, explosion, or injury.

Do not install the product on a defective installation stand.

• It may cause injury, accident, or damage to the product.

Be sure the installation area does not deteriorate with age.

• If the base collapses, the air conditioner could fall with it, causing property damage, product failure, and personal injury.

Do not let the air conditioner run for a long time when the humidity is very high and a door or a window is left open.

• Moisture may condense and wet or damage furniture.

Do not touch(operate) the product with wet hands.

• There is risk of fire or electrical shock.

Do not place a heater or other appliances near the power cable.

• There is risk of fire or electric shock.

Do not let electric parts of the product get wet.

• There is risk of fire, failure of the product, or electric shock.

Safety Presautions

Service Manual 5

■ Installation

Do not open the inlet grill of the product during operation. (Do not touch the electrostatic filter, if the unit is so equipped.)

• There is risk of physical injury, electric shock, or product failure.

Be cautious that water could not enter the product.

• There is risk of fire, electric shock, or product damage.

Always check for gas (refrigerant) leakage after installation or repair of product.

• Low refrigerant levels may cause failure of product.

Install the drain hose to ensure that water is drained away properly.

• A bad connection may cause water leakage.

Do not store or use flammable gas or combustibles near the product.

• There is risk of fire or failure of product.

If strange sounds, or small or smoke comes from product. Turn the breaker off or disconnect the power supply cable.

• There is risk of electric shock or fire.

Safety Presautions

Gasolin

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 transport the product.

• Avoid personal injury.

Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.

• There is risk of fire, electric shock, or damage to the plastic parts of the product.

Do not touch the metal parts of the product when removing the air filter. They are very sharp!

• There is risk of personal injury.

Do not step on or put anyting on the product. (outdoor units)

• There is risk of personal injury and failure of product.

Do not insert hands or other objects through the air inlet or outlet while the product is operated.

• There are sharp and moving parts that could cause personal injury.

■ Operational

Safety Presautions

90˚

Thinner

Wax

Service Manual 7

Features & Benefits

Environment Friendly Refrigerant :

- LG Ceiling Cassette Air Conditioners uses environment friendly refrigerant, which don't do any harm to the environment.

Plasma Air Purifier :

- It removes not only microscopic contaminants & dust, but also house mites, pollen, and pet fur to help preventing allergic diseases like asthma.It provides odor free, dust free and allergy free air.

Group Control :

- It enables to control as much as 16 units with the help of one wired remote controller. All the units will follow same setting of temperature & other sub functions.

Central Control :

- It enables to control 16 x 8 = 128 units with the help of 8 controllers. All units can be put on and off from one Central Room. For Setting Temperature, Fan Speed and other sub functions, access the respective LCD wired remote controller of each unit.

Jet Cool :

-In this mode, quick and fast cooling is done. Cold and

high velocity air is supplied to the room till the indoor temperature reaches 18°C(64°F). The unit will continue to run in jet cool mode till the Indoor temperature reaches 18°C(64°F).

1216........

........

IonizerPre-filter

Dust particles

dusts

Odour

Dust electrode discharge

Odor molecule

+6.5KV discharge

aluminum coated electrode(-) (3.25KV discharge)

Generating

plasma

Dusts Collection

Polluted Air

Purified fresh Air

Main PCB

Controller

# 1

Controller

# 2

Controller

# 8

Sub

128 Sub

128

Features & Benefits

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 its installation environment.

- For example direct drafts can be annoying, leading to discomfort and reduced productivity vane control helps to eliminate this problem.

- Easily controlled by wired remote control.

- Air Flow can be controlled easily regarding any space environment.

Auto Restart Operation :

- Whenever there is electricity failure to the unit, and after resumption of the power, unit will start in the same mode prior to the power failure. Memorized condition are on / off condition, operating mode, set temperature and fan speed.The unit will memorize the above conditions and start with same memorized condition.

Two Thermistor Control :

- There may be a significant difference between the temperature taken at the installed product and indoor temperature. Two thermistor control provides option to control temperature by referring any of the two temperatures. With the help of the slide switch at the back of the LCD wired remote controller, selection of the desired thermistor for controlling the unit can be done. One thermistor is in the Indoor unit & the other one is in the LCD wired remote.

Features & Benefits

Vane 2

Swirl Swing(New)4- Open(Conventional)

2.4% 4.8%100% Improved

Comparison of Air Flow Types

Comparison of Floor Temp. Distribution(20°C)

Vane 1 Close OpenOpen

Open Open

Open

Close CloseOpen

Vane 3 Close Open Close CloseOpen

OpenOpen Close CloseOpen

Vane 2

OpenOpen

Time

Close CloseOpen

Vane 4

Vane 1

Vane 3

Vane 2

Time

Vane 4

Vane 3

Vane 4

Vane 1

Service Manual 9

Features & Benefits

High Ceiling Operation

- According to the height of ceiling installation, it provides variability of indoor fan motor rpm. If the height of installation is low then you can adjust low rpm of indoor fan motor. On the other hand if the height of the installation is high you can adjust high rpm of indoor fan motor. Selection of speed can be done by slide switch at the back of the LCD wired remote.

ex:

Water Drain Pump :

- In some of the places natural drainage is not possible. For such places drain pump is very useful. It removes condensed water from the unit.

Time Delay Safety Function :

- It delays restarting of the compressor by three minutes thereby preventing damage to the compressor.

Zero Standby Power:

- Due to SMPS (Switching Modulation Power Supply) technology, there is almost zero power consumption in the standby mode.

Child Lock Function:

-It prevents the children or others from tampering the

control buttons. Unit can be controlled by the wireless remote controller. This can be easily set by pressing timer key & Min key simultaneously. After child lock is set, pressing any key will displaye CL on the LCD for 3 seconds and all the keys will be ineffective.

Self Diagnosis Function:

- This function provides diagnosis of the unit. An error code will be displayed on the LCD wired remote controller & diagnosis can be done as per the code indication. The same is also printed on key cover of the LCD wired remote controller.

5~6W

Others LG

0.5W

CHILD LOCK

-Display

Selection Height RPM

Lower 2.4m(7.9ft) 700/600/500

Standard 2.7m(8.9ft) 750/650/550

Higher 3.0m(9.8ft) 800/700/600

10 Ceiling Cassette Air Conditioner

List of Functions

• Ceiling Cassette

List of Functions

Air supply outlet Airflow 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 swing CHAOS wind (Auto wind) Jet cool (Power wind) Swirl wind Deodorizing filter

Air purifying Plasma air purifier

Prefilter(Washable) Drain pump

Installation

E.S.P. control Electric heater (Operation) High ceiling operation Hot start

Reliability Self diagnosis

Soft dry operation Auto changeover Auto cleaning Auto operation(Artificial intelligence) Auto restart operation

Convenience

Child lock Forced operation Group control Sleep mode Timer (On/Off) Timer (weekly) Two thermistor control Standard wired remote controller Deluxe wired remote controller

Individual Control

Simple wired remote controller Wired remote controller(for hotel use) Wireless remote controller(simple) Wireless LCD remote controller General central control(Non LGAP)

CAC Network

Dry contact

Function

Simple central control(LGAP) PDI(Power Distribution Indicator) PI 485

Special Function Kit

CTIE Zone control

Others Thermistor

44 XX

Auto Auto

3/4/- 3/4/-

XX XX OO OO XX OO OO OO

-OO XX OO OO XX XX OO OO OO OO

Option Option

-OO OO OO OO

PQWRHSF0 PQWRHSF0

Option Option Option Option Option Option Option Option Option Option

XX XX

FunctionCategory

DMC24CA-1 DMC36CA-1

Note :

O : Applied, X : Not applied, – : No relation Option: Model name & price are different according to options, and assembled in factory with main unit. Accessory: Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package.

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

OFF

CANCEL

SET

°C/°F

AUTO CLEAN

18 16

13 15

Flip-up door (opened)

Signal transmitter

1. START/STOP BUTTON

Operation starts when this button is pressed and stops when the button is pressed again.

2. OPERATION MODE SELECTION BUTTON

Used to select the operation mode.

3. ROOM TEMPERATURE SETTING BUTTONS

Used to select the room temperature.

4. INDOOR FAN SPEED SELECTOR

Used to select fan speed in four steps low, medium and high.

JET COOL

Used to start or stop the speed cooling.(speed cooling operates super high fan speed in cooling mode.)

6. AUTO SWING BUTTON

Used to stop or start louver movement and set the desired up/down airflow direction.

7. ON/OFF TIMER BUTTONS

Used to set the time of starting and stopping operation.

8. TIME SETTING BUTTONS

Used to adjust the time.

9. TIMER SET/CANCEL BUTTON

Used to set the timer when the desired time is obtained and to cancel the Timer operation.

10. SLEEP MODE AUTO BUTTON

Used to set Sleep Mode Auto operation.

11. AIR CIRCULATION BUTTON

Used to circulate the room air without cooling.

12. ROOM TEMPERATURE CHECKING BUTTON

Used to check the room temperature.

13. PLASMA AIR CLEAN BUTTON

Used to start or stop the plasma-purification function.

14. HORIZONTAL AIRFLOW DIRECTION CONTROL BUTTON (OPTIONAL)

Used to set the desired horizontal airflow direction.

15. RESET BUTTON

Used prior to resetting time.

16. 2nd F Button

Used prior to using modes printed in blue at the bottom of buttons.

17. AUTO CLEAN (OPTIONAL)

Used to set Auto Clean mode.

18. °C/°F SWITCH BUTTON

Used to switch temperature reading from Centigrade to Fahrenheit.

❈ The wireless remote controller do not operate the swirl mode.❈ The wireless remote controller do not operate the swirl mode.

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

HI MED LO

Heater Defrost Filter

Preheat Out door

Time

Timer

On Set no. Time

Off

01 03 05 07 09 11 13 15 17 19 21 23

10 12 14

11 13

8 9

1234

ZONE

2ndF

No Func

AUTO JET SLo

1 Operation display

Displays the operation conditions.

2 On/Off Button

Operation starts when this button is pressed, and stops when the button is pressed again.

3 Set Temperature Button

Used to set the temperature when the desired temperature is obtained.

4 FAN Operation Button

Used to circulate room air without cooling.

5 Fan Speed & Jet Cool Button

Used to set the desired fan speed and select jet cool mode.

6 Operation Mode Selection Button

Used to select the operation mode.

• Auto Operation Mode

• Cooling Operation Mode

• Soft Dry Operation Mode

7 Auto Swing Button

Used to swing up and down.

8 Room Temperature Checking Button

Used to check the room temperature.

9 Plasma Air Clean Button

Used to start or stop the plasma-purification function.

10 Timer Cancel Button

Used to cancel the timer.

11 Timer Set Button

Used to set the timer when the desired time is obtained.

12 Week Button

Used to set a day of the week.

13 Program Button

Used to set the weekly timer.

14 Holiday Button

Used to set a holiday of the week.

15 Time Set Button

Used to set the time of the day and change the time in the weekly timer Function.

16 Set and Clear Button

Used to set and clear the weekly timer.

17 Swirl Button

Used to select swirl swing mode.

18 Reset Button

Used to set the current time and clear the setting time.

2. Wired LCD Remote Control

Service Manual 13

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 of Zero.

Conversion Formula kW = Btu/h × 0.0002931 CFM = CMM × 35.3

Power supply

Phase/Volts/Hz

Cooling capacity kW

Btu/h

Heating capacity kW

Btu/h Current Nominal running current A Fan Motor Type

Fan Type Motor Output(W) * number of units Air flow rate (H/M/L) cmm

cfm Capacitor mF/V Drive

Coil Row * stages * FPI mm Dimensions Body mm(inch) (W*D*H) Decorative Panel mm(inch) Net Weight Body kg(lbs)

Decorative Panel kg(lbs)

Gross Weight Body kg(lbs)

Decorative Panel kg(lbs)

Air filter Sound Level (H/M/L) dB(A)+3 Piping Connections Liquid mm(inch)

Gas mm(inch)

Drain OD/ID mm(inch) Dehumidification rate l/h(pts/h) Safety Devices Temperature sensor Refrigerant Refrigerant control Connectable outdoor Unit Power and Transmission interunit cable

No.* mm2 (No. AWG)

Model

DMC24CA-1 DMC36CA-1

Indoor unit type Ceilling Cassette - 4way

1 / 208-230 / 60 1 / 208-230 / 60

7.03 9.96

24,000 34,000

1.0 1.0

BLDC BLDC

Turbo Fan Turbo Fan

50.6 * 1 50.6 * 1

18.4/17.0/15.6 24.1/22.7/21.2 650/600/550 850/800/750

DC DC

2R * 9C * 18 2R * 9C * 18

840 * 840 * 225(331/

16 * 33

16 * 8

8) 840 * 840 * 225(33

16 * 33

16 * 8

950 * 950 * 30(37

/32 * 3713/32 * 13/16) 950 * 950 * 30(3713/32 * 3713/32 * 13/16)

26(57.3) 26(57.3)

3(6.61) 3(6.61)

30(66) 30(66)

4(9) 4(9)

Long Life filter Long Life filter

38/35/32 40/37/34

6.35(1/4) 6.35(1/4)

12.7(1/2) 15.88(5/8)

32/25(1.26/0.98) 32/25(1.26/0.98)

3.0(6.3) 3.7(7.8) Fuse, Thermal protector for Fan motor

Thermistor Thermistor

R410A R410A

EEV EEV

Single Single

4 * 2.1(14) 4 * 2.1(14)

14 Ceiling Cassette Air Conditioner

Specifications

Rated Capacity Cooling kW

Btu/h

Heating kW

Btu/h

Rated Input Cooling kW

Heating kW Energy Label Testing combination Running current Cooling A

Heating A Starting current (Cooling/Heating) A Power supply Phase / Volts / Hz Power supply Cable(outdoor)

No. * mm2(No. AWG)

Power and transmission cable

No. * mm2(No. AWG) Dimensions W * H * D mm(inch) Net weight kg(lbs) Gross weight kg(lbs) Maximum number of connectable unit Compressor Type (constant) Qty * model

Motor Type Oil charge volume cc Oil type

Refrigerant

Charge(at 7.5m(25ft))

g(oz) Type Control

Heat Exchanger Rows * Column * FPI

Defrosting method

Fan Capacitor mF/Vac

Drive Discharge Direction

Side / Top

Air flow rate cmm(cfm)

Noise level(H) Sound press, 1m db (A) + 3 Piping connections Liquid mm(inch)

Gas mm(inch)

Max. piping length Main piping m(ft) Max. elevation

Indoor unit - Outdoor unit

m(ft)

7.03 9.96

24,000 34,000

2.5 3.6

11.5 17

24 38

1 / 208-230 / 60 2 / 208-230 / 60

3 * 2.1(14) 3 * 3.3(12) 4 * 2.1(14) 4 * 2.1(14)

870 * 800 * 320(341/

2 * 31

2 * 12

32) 900 * 1160 * 370(35

16 * 45

16 * 14

16)

73(160) 86(190) 78(172) 93(205)

ROTARY ROTARY

2*GK120KAA GJ151KAA + GJ208KAA

Induction Induction

700 1200

PVE PVE

2100(74.1) 2500(88.2)

R410A R410A

EEV EEV

2R * 36C * 20 2R * 52C * 18

- -

6 / 370 6 / 370

Direct Drive Direct Drive

Side discharge Side discharge

51(1801) 105(3708)

55 58

6.35(1/4) 6.35(1/4)

12.7(1/2) 15.88(5/8) 30(100) 35(115)

15(50) 20(66)

DMC24CA-1 DMC36CA-1

Outdoor Unit

Note :

1. Capacities are based on the following conditions: Cooling: - Indoor Temperature 26.7°C(80°F) DB /19.4°C(66.9°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 of Zero.

Conversion Formula kW = Btu/h × 0.0002931 CFM = CMM × 35.3

Service Manual 15

225(8.9)

950(37.4)

840(33.1)

76(3.0)

135(5.3)

4 5

225(8.9)

806(31.7)

840(33.1)

840(33.1) 688(27.1)

950(37.4)

30(1.18)

950(37.4)

R35(1.4)

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)

840(33.1)

Drain pipe connection

Air suction grille

Part Name

Decoration panel

Air discharge grille

Liquid pipe connection

Gas pipe connection

No.

Remark

Power supply connection

* mm(inch)

Dimensional Drawings

1. Indoor Units

Model No.: DMC24CA-1 / DMC36CA-1

Dimensional Drawings

16 Ceiling Cassette Air Conditioner

870(34.3) 546(21.5)

54.6(2.1)

333(13.1)

Ø531(20.9)

10(0.4)

808(31.8)

782.5(30.8)

392(15.4)

25.5(1.0)

80(3.1)

50(2.0)

320(12.6)

340(13.4)

360(14.2)

160(6.3)

*mm(inch)

Dimensional Drawings

Model No.: DMC24CA-1

2. Outdoor Units

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