Gree Ultra Heat GMV Multi VRF Heat Recovery Series Service Manual page 119

Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial
new debugging process can be performed.
Note: During commissioning, users must listen to the operating sound of both outdoor and indoor
fans and compressors to check for exceptions.
3.3.3 Operations after commissioning
Sort and save data. Make detailed records of exceptions and troubleshooting methods during
commissioning for later maintenance and query. At last, make a commissioning report and hand it over
to users.
3.3.4 Precautions to let users know after commissioning
(1) For heat pump, let users know where the master IDU is located and stick a label to the master
IDU. Tell users that modes of other IDUs are limited by the mode of master IDU.
(2) An ODU that has been in power-off status for more than 24 hours should be preheated for more
than eight hours before startup to prevent damaging compressors.
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COMMISSIONING OPERATION