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08_Confirm preheated
compressor
If the ODU valves connecting with IDU have been opened manually, then press SW4 confirmation
button on the master unit to confirm it.
If ODU compressors have been preheated for more than 8h, system will display as below and start
next progress.
——
progress
08_Confirm preheated
compressor
If less than 8h of preheat time is detected, system will give error alarm and display as below. Then
press SW4 confirmation button and SW2 button at the same time to skip the wait time and start next
progress. But this will cause force start of the compressor, which may damage the compressor.
——
Progress
08_Confirm preheated
compressor
Step 14: Progress 09 is "Refrigerant judgments before startup".
If the refrigerant quantity inside the system meets the requirement of operation startup, system will
display as below and start next progress.
——
progress
09_Refrigerant
judgments before
startup
If there's no or not enough refrigerant in the system to meet the requirement of operation startup,
system will display U4 "refrigerant shortage protection" and fails to start next progress. Then check if
there's any leakage or add refrigerant inside until error eliminates.
——
progress
09_Refrigerant
judgments before
startup
Step 15: Progress 12 is "Confirm debugging startup".
In order to make sure all preparation work is done before startup, this step is designed for user to
confirm the startup again. Operate as below:
If master unit displays as below, system is waiting for confirmation signal.
——
db
Light
Debugging code
LED1
Code
Display status
db
Light
Debugging code
LED1
Code
Display status
db
Light
Debugging code
LED1
Code
Display status
db
Light
Debugging code
LED1
Code
Display status
U4
Light
Debugging code
08
Light
Progress code
LED2
code
Display status
08
Light
Progress code
LED2
Code
Display status
08
Light
Progress code
LED2
code
Display status
09
Light
Progress code
LED2
code
Display status
Progress code
50
Ultra Heat GMV Multi VRF
on
Light
Status code
LED3
Code
Display status
oC
Light
Status code
LED3
Code
Display status
U0/
Preheat
Blink
time
Status code
LED3
Code
Display status
oC
Light
Status code
LED3
Code
Display status
Status code
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