Gree Ultra Heat GMV Multi VRF Heat Recovery Series Service Manual page 107

Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial
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
A0
CC
CF
01_ Set master
unit malfunction
CJ
db
02_Allocate
db
addresses
db
03_Confirm the
quantity of
modules
db
db
04_ Confirm the
quantity of IDUs
db
Progress code
LED1 LED2
Display
Code
status
Light
Light
Light
Light
Light 01
Light 02
Light 03
Light 03
Light 04
Light 04
Status code
LED3
Display Display
Code
status status
Light oC Light
Light oC Light
Blink 01~03 Blink
Light oC Light
Blink 01~60 Blink
Light oC Light
103
COMMISSIONING OPERATION
Meaning
System is not debugged.
Master unit hasn't been set, please
set it.
Master unit is two or more than two.
Please reset.
Address DIP switch code of system
is shocking.
Master unit has been set
successfully. Next step will start
automatically.
Address allocation is finished. Next
step will start automatically.
LED3 displays the quantity of
module. In this case, please
confirm if the quantity is correct
manually.
System has confirmed the quantity
of module. Next step will start
automatically.
LED3 displays the quantity of IDU.
In this case, please confirm if the
quantity is correct manually.
System has confirmed the quantity
of IDU. Next step will start
automatically.