Gree GMV-140WL/A-T User Manual page 23

necessary to perform test operation and debugging. Otherwise, unit won't be able to work.
2. Test operation and debugging must be performed by professional technicians or under the
guidance of professional technicians.
5.2.1 Prepare the test operation and debugging
(1) Do not connect power until all installation work is finished.
(2) All control circuits and wires are correctly and securely connected.
(3) Check whether the fixing loops for compressor foots are removed.
(4) All small pieces, especially metal chips, thread ends and forceps holder, must be removed
from the unit.
(5) Check whether unit's appearance and pipeline system has been damaged during
transportation.
(6) Calculate the quantity of refrigerant that needs to be added according to the pipe length.
Pre-charge the
refrigerant can't be added, record the quantity of refrigerant that still needs to add and
complement the quantity during test operation. For details of adding refrigerant during test
operation, see below.
(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 ODU
Debugging
——
code
LED1
Progress
Code
db
01_ Set master
unit
db
db
02_ Allocate
db
addresses
db
db
03_ Confirm
the quantity of
db
ODU
refrigerant. In case that the required charging quantity is not reached while
Description of each stage of debugging progress
Progress code
LED2
Display Display
Code
status status
On 01 On
On 01 On
On 02 On
On 02 On
On 02 On
On 03 On
On 03 On
DC Inverter Multi VRF System User Manual
Status code
LED3
Display
Code
status
AO On System is not debugged.
Hold main board's SW7 button for 5s to start
OC On debugging. Main board will display as said in the
left. 2s later, next step starts.
System is allocating addresses. 10s later, display
Ad Blink
as below:
No master indoor unit. Display will be on for 1min,
during which master IDU can be set manually. If
L7 Blink
not, system will set the unit with minimum IP
address as the master IDU.
OC On Allocation is finished. 2s later, next step starts.
01 Blink System is confirming. 1s later, next step starts.
System finishes confirmation. 2s later, next step
OC On
starts.
20
Code meaning and operation method