LG LBNG3061YL User manual

Ceiling Duct Air Conditioner
SVC MANUAL(Exploded View)
MODEL : LBNG3061YL
LBUG3061YL
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
Internal Use Only
http://biz.lgservice.com
MODEL :

Contents
Functions .................................................................................................................................3
Product Specifications (Cooling & Heating)..........................................................................6
Dimensions ..............................................................................................................................7
Refrigeration Cycle Diagram ..................................................................................................8
Wiring Diagram ........................................................................................................................9
Operation Details ...................................................................................................................10
Installation of Indoor, Outdoor Unit .....................................................................................14
Test Running...........................................................................................................................23
Optional Operation ................................................................................................................25
Cycle........................................................................................................................................27
Cycle Troubleshooting Guide ..............................................................................................30
Electronic Parts Troubleshooting Guide .............................................................................31
Electronic Control Device .....................................................................................................44
Exploded View ........................................................................................................................48
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Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only

Functions
Indoor Unit
Operation ON/OFF by Remote controller
Sensing the Room Temperature
Room temperature control
Starting Current Control
Time Delay Safety Control
Indoor Fan Speed Control
Soft Dry Operation Mode
Auto Operation(Auto Change Over)
Deice (defrost) control (Heating)
Auto Restart
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Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Hot-start Control (Heating)
High head height Drain pump(Optional)
Central Control(Optional)
Group Control(Optional Wiring)
PLASMA (Optional)
Telephone Control Operation (Optional)
Radio Frequency Control Operation(Optional)
•
Maintains the room temperature in accordance with the Setting Temp.
• Indoor fan is delayed for 5 seconds at the starting.
• High, Med, Low
• Although the air-conditioner is turned off by a power failure, it is restarted automati-
cally previous operation mode after power supply.
• The setting temperature and desired operation mode are auto-
matically set by fuzzy rule.
• Both the indoor and outdoor fan stops during defrosting.
• Hot start after defrost ends.

- 4 -
Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Outdoor Unit
Power relay control
Comp. Freq. control
Overheatng. Protection(Power module)
Freq. speed control(up/down speed)
V/F control
Total current control (over current protection)
DC peak current control
4 way valve control
Outdoor fan motor control
Discharge pipe temp. control
Overpressure protection
• If power is on, it will operate to chage capacitor on controller and power relay will operate after about
10sec.
• The final operating freq. of comp. is set the lowest freq. that limited outdoor temp., discharge pipe temp.,
target freq., owing to CT.
• It will be changed the drive voltage of comp. according to operating frequency.
• It is only operated in the heating operation mode except defrosting operation.
• High speed/Low speed

- 5 -
Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Remote Controller
Operation ON/OFF
Operation Mode Selection
Fan Speed Selection
Room Temperature Display
Temperature Setting
Setting the Timer
Weekly Program
(Cooling
model only) (Heating
model only)
(Low) (Med) (High)
Cooling Operation Mode ( )
Heating Operation Mode ( ) Auto Operation Mode ( ) : Cooling model
Soft Dry Operation Mode ( )
Fan Operation Mode
Phase Control Setting
HI AUTOMEDLO
Auto change-over ( ) : Heating model
Program Holiday
SET/CLR
MinHour
Week
Timer CancelTimer Cancel
Timer
: High:39°C ↔LOW:11°C
: Fan Operates without cooling & heating
Cooling Heating
Down to 18°C
Up to 30°C
Down to 16°C
Up to 30°C