DC Inverter Multi VRF System User Manual
19
7) After refrigerant is added, make sure valves of outdoor unit are completely open.
8) For the convenience of troubleshooting during debugging, unit shall be connected to a PC
with applicable debugging software. Make sure unit’s real-time data can be checked through
this computer. The installation and connection of debugging software can be found in the
Service Manual.
9) Before test operation, make sure unit is power on and compressor has been preheated for
more than 8 hours. Touch the unit to check whether it’s normally preheated. If yes, start test
operation. Otherwise, compressor might be damaged.
5.2.2 Test Operation and Debugging
Description of test operation procedures and main board display of Outdoor.
Description of each stage of debugging progress
—
Debugging code Progress code Status code
Code meaning and operation method
Progress
LED1
LED2
LED3
Code Display
status Code
Display
status Code
Display
status
01_Set master
unit
db
On
01
On
AO
On
System is not debugged.
db
On
01
On
OC
On
Hold main board’s SW7 button for 5s
to start debugging. Main
board will display as said in the left. 2s later, next step starts.
02_Allocate
addresses
db
On
02
On
Ad
Blink System is allocating addresses. 10s later, display as below:
db
On
02
On
L7
Blink
No master indoor unit. Display will be on for 1min, during
which master IDU can be set manually. If not, system will
set the unit with minimum IP address as the master IDU.
db
On
02
On
OC
On
Allocation is finished. 2s later, next step starts.
03_Confirm
the quantity of
ODU
db
On
03
On
01
Blink
System is confirming. 1s later, next step starts.
db
On
03
On
OC
On
System finishes confirmation. 2s later, next step starts.
04_Confirm the
quantity of IDU
db
On
04
On
01~80 Blink
LED3 displays the quantity of indoor unit. Confirm the
number manually.
If the number is not consistent the
display one, cut off power of IDU and ODU and check
whether communication wire of IDU is correctly
connected.
After the check, connect power and start
debugging from progress 01.
If the number is then
correct, press main board’s SW7 button to confirm.
Then the display is as below:
db
On
04
On
OC
On
System has confirmed the quantity. 2s later, next step starts.
05_Detect
ODU’s internal
communication
and capacity
ratio
db
On
05
On
C2
On
Communication between master ODU and driver has
error.
Check the communication connection of
ODU’s main board and drive board.
When the error
is eliminated, start next step. If power is off during
troubleshooting, then restart debugging from progress 01
after power is on.
db
On
05
On
OC
On
Communication of master ODU and driver is normal. Unit
will display as in the left for 2s and detect the capacity
ratio of IDU and ODU. If the ratio is within range, than
next step will start 2s later. If the ratio is out of range, unit
will display as below:
db
On
05
On
CH
On
Rated capacity ratio of IDU is too high.
Change the
combination way of IDU and ODU to make the ratio
within range.
And restart debugging from progress 01.
db
On
05
On
CL
On
Rated capacity ratio of IDU is too low.
Change the
combination way of IDU and ODU to make the ratio
within range.
And restart debugging from progress 01.
06_Detect
outdoor
components
db
On
06
On
error
code
On
Outdoor component’s error. LED3 will display the
related error code.
After errors are eliminated,
system
will start next step automatically. If power is off during
troubleshooting, then restart debugging from progress 01
after power is on.
db
On
06
On
OC
On
System detects no error on outdoor component. 10s later,
next step starts.
