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Internal Use Only
http://biz.lgservice.com
System
R410A
Indoor Unit
SERVICE MANUAL R410A
MODEL : ARNU Series
URNU Series
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
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Air Conditioner Service Manual TABLE OF CONTENTS Safety Precautions............................................................................................................................3 Part 1 General Information.............................................................................................................10 Model Names .............................................................................................................................11 External Appearance .........
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Part 1 General Information 1. Model Names .............................................4 2. External Appearance .................................5 3. Nomenclature .............................................6 - 3 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes
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Model Names 1. Model Names Capacity(Btu/h(kW)) Category Chassis 7k 9k 12k 15k 18k 24k 28k 36k 42k 48k 76k 96k Name (2.2) (2.8) (3.6) (4.5) (5.6) (7.1) (8.2) (10.6) (12.3) (14.1) (22.4) (28) ARNU07 ARNU09 ARNU12 ARNU15 SE Wall Mounted GSE*2 GSE*2 GSE*2 GSE*2 (General) ARNU18G ARNU24G S5 S5*2 S5*2 ARNU07 ARNU09 ARNU12 ARNU15 SE GSE*2 GSE*2 GSE*2 GSE*2 Mirror ARNU18 ARNU24 ART COOL S3 GS3*2 GS3*2 ART Cool ARNU07 ARNU09 ARNU12 SF GSF*2 GSF*2 GSF*2 Gallery ARNU07 ARNU09 ARNU12 1 Way TJ GTJ*2 GTJ*2 G
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External Appearance 2. External Appearance Ceiling Cassette- 1Way Ceiling Cassette -2Way ARNU07GTJ*2 ARNU18GTL*2 ARNU09GTJ*2 ARNU24GTL*2 ARNU12GTJ*2 * A:Basic, C:Plasma * A:Basic, C:Plasma Ceiling Cassette- 4Way Ceiling Concealed Duct - High Static ARNU07GTE*2 ARNU24GTP*2 ARNU07GBHA2 ARNU36GBGA2 ARNU09GTE*2 ARNU28GTP*2 ARNU09GBHA2 ARNU42GBGA2 ARNU12GTE*2 ARNU36GTN*2 ARNU12GBHA2 ARNU48GBRA2 ARNU15GTE*2 ARNU42GTM*2 ARNU15GBHA2 URNU76GB8A2 ARNU18GTE*2 ARNU48GTM*2 ARNU18GBHA2 URNU96GB8A2 ARNU24GBHA
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Nomenclature 3. Nomenclature ARN U 07 G TJ A 2 Serial Number Combinations of functions A:Basic function L:Neo Plasma(Wall Mounted) C:Plasma(Ceiling Cassette) G: Low Static ART COOL Type Panel Color B:Blue D:Wood M:Metal R:Mirror W:White Wood V: Silver E:Red G:Gold 1: Kiss (Photo changeable) Chassis Name Electrical Ratings 1:1Ø, 115V, 60Hz 2: 1Ø, 220V, 60Hz 6:1Ø, 220 ~ 240V, 50Hz 7: 1Ø, 100V, 50/60Hz G:1Ø, 220 ~ 240V, 50Hz / 220V 60Hz Total Cooling Capacity in Btu/
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Part 2 Indoor Units Ceiling Cassette 1 Way .................................................................................8 2 Way ...............................................................................13 4 Way(1)...........................................................................20 4 Way(2)...........................................................................23 Art Cool Series ART COOL Miror .............................................................30 ART COOL Gallery .
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Ceiling Mounted Cassette Type (1Way) 1. Functions ......................................................................................9 2. Operation Details........................................................................10 3. Dimensions .................................................................................12 - 8 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes
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Specification 1. Functions Indoor Unit Operation ON/OFF by Remote controller Sensing the Room Temperature • Room temperature sensor. (Thermistor) Room temperature control • Maintains the room temperature in accordance with the Setting Temperature. • Indoor fan is delayed for 5 seconds at the starting. Starting Current Control Indoor Fan Speed Control • Jet, High, Med, Low, Lolow • Intermittent operation of fan at low speed. Soft Dry Operation Mode Airflow Direction Control • The louver can be se
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Operation Detail 2. Operation Detail (1) The function of main control Auto Swing Control • This function is to swing the louver up and down automatically. Soft-Dry Operation • The indoor fan speed is automatically set to the low, so the shift of the indoor fan speed is impossible because of already being set to the best speed for Dry Operation by microcontroller control. Cooling Mode Operation • When selecting the Cooling( ) Mode Operation, the unit will operate according to the setting by
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Operation Detail Heating Mode Operation The unit will operate according to the setting by the remote controller and the operation diagram is shown as following. Indoor pipe Temperature 36(42)°C 33(39)°C 25°C 22(20)°C Room Temperature Thermal Off Thermal On Minimum 3min Thermal ON OFF ON OFF ON Outdoor fan ON Setting Setting Setting Indoor fan Stop Low Low Low Low Stop Stop Low fan fan fan speed speed speed 4 Way ON Thermal ON Thermal OFF Indoor Unit mode ST+2 ST+4 2TH To
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Dimensions 3. Dimensions 16.4 110 - 12 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes Ceiling Cassette 1-way ARNU07GTJ*2 ARNU09GTJ*2 ARNU12GTJ*2 961.2 19.1 860 16.5 (unit : mm) 32.8 Number Name Descripition 1 Liquid pipe connection ø6.35 flare 2 Gas pipe connection ø12.7 flare 3 Air suction grill 4 Air discharge grill Note 1. Unit should be installed in compliance with the installation manual in the product box. 1
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Ceiling Mounted Cassette Type (2Way) 1. Functions ....................................................................................14 2. Operation Details........................................................................15 3. Dimensions .................................................................................17 - 13 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes
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Functions 1. Functions Indoor Unit Operation ON/OFF by Remote controller Sensing the Room Temperature • Room temperature sensor. (Thermistor) Room temperature control • Maintains the room temperature in accordance with the Setting Temperature. • Indoor fan is delayed for 5 seconds at the starting. Starting Current Control Indoor Fan Speed Control • Jet, High, Med, Low, Lolow • Intermittent operation of fan at low speed. Soft Dry Operation Mode Airflow Direction Control • The louver can be set at
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Operation Detail 2. Operation Detail (1) The function of main control Auto Swing Control • This function is to swing the louver up and down automatically. Soft-Dry Operation • The indoor fan speed is automatically set to the low, so the shift of the indoor fan speed is impossible because of already being set to the best speed for Dry Operation by microcontroller control. Cooling Mode Operation • When selecting the Cooling( ) Mode Operation, the unit will operate according to the setting by
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Operation Detail Heating Mode Operation The unit will operate according to the setting by the remote controller and the operation diagram is shown as following. Indoor pipe Temperature 36(42)°C 33(39)°C 25°C 22(20)°C Room Temperature Thermal Off Thermal On Minimum 3min Thermal ON OFF ON OFF ON Outdoor fan ON Setting Setting Setting Indoor fan Stop Low Low fan Low fan Low Stop Stop Low fan speed speed speed 4 Way ON Thermal ON Thermal OFF Indoor Unit mode ST+2 ST+4 2TH To
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Dimensions 3. Dimensions - 17 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes Ceiling Cassette 2-way ARNU18GTL*2 ARNU24GTL*2 A 830 B 47.9 (unit : mm) Number Name Descripition 1 Liquid pipe connection (18k) ø6.35, (24k)ø9.52 2 2 Gas pipe connection (18k) ø12.7, (24k)ø15.88 3 Air suction grill 4 Air discharge grill 1 Note 1. Unit should be installed in compliance with the installation manual 889.2 in the product
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Ceiling Mounted Cassette Type (4Way) (1) 1. Functions ....................................................................................19 2. Operation Details........................................................................20 3. Dimensions .................................................................................22 - 18 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes
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Functions 1. Functions Indoor Unit Operation ON/OFF by Remote controller Sensing the Room Temperature • Room temperature sensor. (Thermistor) Room temperature control • Maintains the room temperature in accordance with the Setting Temperature. • Indoor fan is delayed for 5 seconds at the starting. Starting Current Control Indoor Fan Speed Control • Jet, High, Med, Low, Lolow • Intermittent operation of fan at low speed. Soft Dry Operation Mode Airflow Direction Control • The louver can be set at
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Operation Detail 2. Operation Detail (1) The function of main control Auto Swing Control • This function is to swing the louver up and down automatically. Soft-Dry Operation • The indoor fan speed is automatically set to the low, so the shift of the indoor fan speed is impossible because of already being set to the best speed for Dry Operation by microcontroller control. Cooling Mode Operation • When selecting the Cooling( ) Mode Operation, the unit will operate according to the setting by
