LG Multi V PRHR033 Installation Manual page 38

38
Between Indoor and Master Outdoor unit
SODU. B SODU. A IDU. B IDU. A CEN. B CEN. A DRY1 DRY2
A B 3(A) 4(B) 3(A) 4(B)
HR unit
SODU. B SODU. A IDU. B IDU. A CEN. B CEN. A DRY1
SODU. B SODU. A IDU. B IDU. A CEN. B CEN. A DRY1
SODU. B SODU. A IDU. B IDU. A CEN. B CEN. A DRY1
• It is not the point to make ground connection.
- Make sure that terminal number of master and slave outdoor units
are matched. (A-A,B-B)
Example) Connection of Communication Cable
[BUS type]
- Connection of communication
cable must be installed like
below figure between indoor
unit to outdoor unit.
Example) Connection of power and communication cable (UWB)
Master
GND 12 V
Outdoor Unit
3(A) 4(B) 3(A) 4(B)
Master
DRY2 GND 12 V
Outdoor Unit
Slave1
DRY2 GND 12 V
Outdoor Unit
Slave2
DRY2 GND 12V
Outdoor Unit
[STAR type]
- Abnormal operation can be
caused by communication
defect, when connection of
communication cable is installed
like below figure (STAR type).
Main power
Terminal block
Ground wire
Power/
Ground cable
Over
50 mm
(1.97 inch)
Communication
cable
Main Power Connection
Main power
Terminal block
Insulation sleeves
attachments
Fix firmly not
to be displaced
Ground wire
Communication Connection
CAUTION
!
It should be wiring power cables or communication cables to avoid
interference with the oil level sensor. Otherwise, That oil level sensor
would be operated abnormally.
Checking the setting of outdoor units
Checking according to DIP switch setting
- You can check the setting values of the Master outdoor unit from the
7 segment LED.
The Dip switch setting should be changed when the power is OFF.
Checking the initial display
The number is sequentially appeared at the 7 segment in 5 seconds
after applying the power. This number represents the setting condition.
[Main Board]
ARWM***CAS5
SW01C
(Automatic Addressing Setting)
• Communication speed setting
- Set the DIP switch 3 to "On" if all the indoor units are "ARN*******4".
- Set the DIP switch 3 to "Off" if not all the indoor units are "ARN*******4".
CAUTION
!
1. Set the DIP switch No. 3 "On" and if not all the indoor units are
"ARN*******4" connected, normal communication is impossible,
so DIP switch No. 3 must be set to "Off".
2. When changing DIP switch, all power should be off and auto
addressing must be executed.
ODU-IDU
Communication cable
ODU-ODU
Communication cable
DIP switch
7 Segment