Samsung AM072/096/120/144FXVAFH Service Manual page 117

Troubleshooting
Initial Tracking (Communication Check-up) - Display
1. For the display module of the outdoor unit, there are differences in the contents displayed depending on whether the relevant outdoor
unit is a master unit or a sub unit.
1) Master Unit
The outdoor unit Micom attempts communication with the indoor unit connected to the communication cable (F1/F2) when the power is turned on.
Basic segment display
Step Display content
Checking segment
At initial power input
display
While setting
communication Number of
between indoor and connected indoor
outdoor unit units
(Addressing)
After communication
Transmit/
setting
Reception address
(usual occasion)
I/U : Indoor unit
If the number of indoor units set by the outdoor unit is not in accordance with the number of indoor units that succeeded with
communication, then the four displaying parts will display
2) Sub(Slave) Unit
The two left hand displays show its own address and the two right hand displays show the outdoor unit's address.
Main address : C8, Sub1 address : C9, Sub2 address : CA, Sub3 address : CB
2. The number of the indoor Units Connected to the outdoor unit can be configured by using the indoor unit installation quantity setup switch.
Indoor Unit Installation Quantity Setup Switch
The following is an example of how to use the switch according to the number
of indoor unit installations. The maximum number of possible indoor unit con-
nections is 64.
3Units Connected 17Units Connected
10' s Digit 1' s Digit 10' s Digit
0 3 1
3. If the quantity of the indoor units configured with the indoor unit installation quantity setup switch does not match the quantity of the
indoor units found during the tracking process, E201 and U200 will be displayed in order on the display module.
4. When you install more than one MCU, set the quantity of installed MCU.
4-20
Display
SEG1 SEG2 SEG3
"8" "8" "8"
SEG1 SEG2 SEG3, 4
Number of communicated units
"A" "d" Refer to "View Mode" for
communication address
SEG1 SEG2 SEG3, 4
I/U : "A" I/U : "0" Reception address
MCU : "C" MCU : "1" (in decimal number)
31Units Connected 64Units Connected
1' s Digit 10' s Digit 1' s Digit 10' s Digit
7 3 1
for Problem
SEG4
G2
"8"
SEG3, 4
SEG3, 4
g
SEG1
.
1' s Digit
6 4
b c e d b c e d
G2
a f G1 g a f G1
SEG2 SEG3 SEG4
Outdoor Unit Display Parts
Indoor Unit MCU
Installed Installed
Quantity Quantity
10' s Digit 1' s Digit
(0~9) (0~9)
Samsung Electronics