Gree GMV5E Series Service Manual page 241

GREE
② Communication state check
After AP1 DIP setting and all wiring, power on the master ODU AP1 and check whether D3 and D4
LEDs are flashing. See the figure below:
Power
Power
D1
If the LEDs flash, the ODU and IDUs normally communicate; if the LEDs are steadily on,
communication is faulty. Check communication lines connecting the ODU and IDUs.
Note: After AP1 is replaced, you should power on the ODU and IDUs at the same time or power on
the ODU first; otherwise, "CC does not have module" will be prompted and a "C0 fault" alarm will be
reported by the IDUs.
③ Master ODU engineering debug setting
Debug the entire system after master module AP1 replacement.
④ System parameter setting
After system debug, reset system parameters. For details, refer to section 1 "ODU Function Setting",
in part II, chapter III.
3.1.1.3 Cautions on Replacement of Slave ODU AP1
Before replacing slave module AP1, set DIP identical to that of the faulty AP1, check wiring, and
then power on the AP1.
3.1.2 Cautions on IDU AP1 Replacement
Before replacing IDU AP1, determine the module is a master IDU or a slave IDU.
(1) AP1 DIP Setting and Jumper Cap Confirmation
Whatever the AP1 you replace is a master IDU AP1 or a slave IDU AP1, after it is replaced, check
original DIP setting and model.
Configure capacity DIP for the new AP1 and confirm its jumper cap, fan overload detect terminal,
and overflow detect terminal. They should be kept identical to those of the faulty AP1.
Their positions and corresponding silkscreen are as follows:
Capacity DIP: S1 (Capacity)
Jumper cap: U22 (Jump)
Overflow detect terminal: CN35(WATER-DTCT)
Fan overload detect terminal: CN36(OVC-FAN)
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
IDU and ODU
Running
communication
ODU ODU
Run
IDU IDU
D2 D3 D4
Inter-system
Main
communication
system
System1 System1
M a i n -
system
System2 System2
D5 D6 D7
237
Reserved
D8