Gree GMV-Q224WM/B-X Owner's Manual page 51

5.2.2 Trial Operation
5.2.2.1 Notices
（1）Before trial operation, make sure unit is powered on and the compressor has been preheated
for 8h. Touch the unit to check whether it's normally preheated. If yes, start test operation.
Otherwise, compressor might be damaged. Trial operation shall be performed by professional.
（2）After starting unit's debugging, the system will automatically select the operation mode
according to current ambient temperature:
1）If outdoor ambient temperature is above 20℃, the debugging mode is complete cooling mode;
2）If outdoor ambient temperature is below 20℃, the debugging mode is complete heating mode.
（3）Before debugging, please make sure the cut-off valve of each outdoor basic module is
completely open.
（4）During debugging, the front panel of outdoor unit must be closed completely. Otherwise, the
accuracy of normal debugging will be affected (as shown below).
（5）Before debugging, please make sure over 70% of additional refrigerant charge for connection
pipe has been done.
（6）During debugging,
Figure 50
Figure 51
description of each stage of debugging progress is shown as below:
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Heat Recovery DC Inverter Multi VRF Unit