GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
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follows and the unit automatically enters the next commissioning step.
09_Pre-startup
refrigerant
detection
The system detects that
refrigerants are normal and
automatically enters the next
step.
If no refrigerant exists in the system or the refrigerant volume does not meet the system startup
requirements, "U4 lack of refrigerant protection" is prompted and the main board is displayed as follows.
The unit cannot enter the next commissioning step. In this case, check for leakage or append
refrigerants till the exception disappears.
09_Pre-startup
refrigerant
detection
The system detects
insufficient
refrigerants and
stops to balance the
pressure lower than
0.3 MPa.
Step 14: Unit commissioning step 10 is pre-startup ODU valve status detection.
If the master unit is displayed as follows, it indicates that the unit is being enabled.
10_Pre-startup
ODU valve status
detection
Outdoor unit valves
are being opened.
If the master unit is displayed as follows, it is required to check again whether the ODU valves are
completely opened.
10_Pre-startup
ODU valve status
detection
It is required to
check again whether
the ODU valves are
completely opened.
After confirming that all valves are completely opened, press "SW7" to enter the next commissioning
step.
If it is detected that the unit valve status is normal, the main board is displayed as follows and the
unit automatically enters the next commissioning step.
10_Pre-startup
ODU valve status
Outdoor unit valves
have been properly