Gree GMV6 DC Inverter VRF Units Service Manual
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(4) Checking communication status
After the setting of the main board DIP switches is completed and all the cables are connected, the
ODU’s main control board is switched on. Check whether D3 and D4 indicators on the IDU sand ODU
flash. If D3 and D4 flash, the communication between the main control boards of the IDU and ODU is
normal. If not, the communication is faulty. The communication wiring between the IDUs and ODU needs
to be checked again.
Note:
After the main control is replaced, the IDUs and ODU need to be powered on concurrently or the
ODU needs to be powered on before the IDUs. Otherwise, the "No controlling unit" faulty will occur, and
the IDUs will report the C0 fault.
(5) Setting of master unit engineering commissioning status
After the main board of the master module is replaced, engineering commissioning needs to be
performed on the master unit.
(6) System parameter setting
After the engineering commissioning, system parameters need to be set to be consistent with the
previous system parameters. Read
ODU Function Setting
for the setting method.
5.3 Removing the Compressor
Step 1:
Preparations before replacing
(1) Make sure that all the spare parts for replacement are in place.
During the handling of the old and new compressors, do not place the compressor flat or place it
upside down. The compressor needs to be placed with an angle of less than ±30°. The lubricant of the
compressor must not outflow from the pipe. Make sure that the compressor air inlet, air outlet and vapor
injection tube opening are sealed. If the sealing rubber block is missing, use rubber tap to seal it to prevent
direct contact between oil in the compressor and air.
