Ultra Heat GMV Multi VRF_Heat Recovery Serial
52
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.
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.
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.
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.
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
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