GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
113
displayed as follows and the unit automatically enters the next step.
08_Compresso
r preheating
confirmation
The system detects
that the compressor
preheating period is
more than eight hours
and automatically
enters the next step.
If it is detected that the compressor preheating period is less than eight hours, an exception is prompted
and the main board is displayed as follows. In this case, press "SW7" to skip the waiting time and
automatically enter the next commissioning step. However, the compressor may be damaged if it is
forcibly started.
08_Compresso
r preheating
confirmation
The system gives a
prompt if the
compressor preheating
period is less than eight
hours.
Step 13: Unit commissioning step 09 is pre-startup refrigerant confirmation.
If the refrigerant volume meets the system startup requirements, the main board is displayed as 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
Outdoor unit valves are
being opened.
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