GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
111
If the displayed quantity is inconsistent with the number of actually connected modules, check whether
communication cables are correctly connected between modules in power-off status. Then perform
commissioning again.
Note: It is very important to correctly confirm the number of ODUs. If the confirmed quantity is
inconsistent with the actual quantity, the system may improperly run.
Step 8: When the unit runs to step 04, users need to manually confirm the number of indoor modules.
The main board of each module is displayed as follows:
04_Indoor unit
quantity
confirmation
If the displayed quantity is consistent with the number of actually connected modules, press "SW7" on
the master unit to confirm. The main board is displayed as follows and the unit automatically enters the
next commissioning step.
04_Indoor unit
quantity
confirmation
Note: It is very important to correctly confirm the number of IDUs. If the confirmed quantity is
inconsistent with the actual quantity, the system may improperly run.
Step 9: Unit commissioning step 05 is internal communication detection.
If no exception is detected, the main board is displayed as follows and the unit automatically enters the
next commissioning step.
05_Internal
communication
detection
The system
completes detection
and automatically
enters the next step.
If an exception is detected, the unit retains the current status and waits for manual troubleshooting.
Corresponding faults include:
05_Internal
communication
detection
The system detects
communication failure
between master unit
and inverter
compressor driver.
The system detects
communication failure
between master unit
and inverter fan
driver.
The rated capacity
ratio is over-high
between indoor and
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