Gree Ultra Heat GMV-V72W/A-F, Service Manual, Page: 94 / 240

Ultra Heat GMV VRF Technical Service Manual COMMISSIONING OPERATION
89
Cooling mode when the outdoor environment temperature is higher than 20°C
（
68
℉）
.
Heating mode when the outdoor environment temperature is lower than 20°C
（
68
℉）
.
(3) Before starting commissioning, make sure again that stop valves of all basic modules of the
ODU have been completely opened.
(4) During commissioning, the front panel of ODU must be completely covered. Otherwise,
commissioning accuracy may be affected (as shown in the following figure).
(5) Before commissioning, make sure that appending refrigerants to pipes has finished completely
or for more than 70%.
(6) The following table describes progress display of each phase during commissioning:
Description of each stage of debugging progress
——
Debugging code Progress code Status code
Meaning
Progress
LED1 LED2 LED3
Code
Display
status
Code
Display
status
Code
Display
status
01_ Detect unit
malfunction
db On 01 On A0 On System is not debugged.
db On 01 On
Error
code
On
Malfunction occurs when
debugging.
db On 01 On OC On
There is no malfunction. Next step
will start automatically.
02_Confirm the
quantity of
module
db On 02 On 01~04 Blink
LED3 displays the quantity of
module. In this case, please
confirm if the quantity is correct
manually.
db On 02 On OC On
System has confirmed the quantity
of module. Next step will start
automatically.
03_Confirm the
quantity of IDU
db On 03 On 01~80 Blink
LED3 displays the quantity of IDU.
In this case, please confirm if the
quantity is correct manually.
db On 03 On OC On
System has confirmed the quantity
of IDU. Next step will start
automatically.
04_Open ODU
valve
connecting with
IDU
db On 04 On On On
LED3 displays the on-off state of
ODU valves connecting with IDU.
In this case, please confirm if the
ODU valves are open manually.
db On 04 On OC On
System has confirmed the ODU
valves are open. Next step will start
automatically.
05_Confirm
preheated
compressor
db On 05 On
U0/
preheat
time
Blink
U0 means preheat time for
compressor is less than 8 hours.
db On 05 On OC On
Compressor has been preheated
for 8 hours. Next step will start
automatically.
06_Refrigerant
judgments
before startup
db On 06 On U4 On System is lack of refrigerant.
db On 06 On OC On
Refrigerant is normal. Next step will
start automatically.
07_ Confirm the
way of charging
additional
refrigerant
amount
db On 07 On AE~AL Blink
LED3 displays the way of charging
additional refrigerant amount,
please choose one way of charging
additional refrigerant amount.
db On 07 On AE On
The unit has been set in debugging
operation status of charging
refrigerant amount manually.