GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
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2.3.3 Commissioning Operation
2.3.3.1 Precautions
(1) Before starting commissioning, make sure that the unit compressor has been preheated for
more than eight hours and check whether preheating is normal by touching. Commissioning can be
started only when preheating is normal. Otherwise, the compressor may be damaged. Commissioning
must be performed or guided by professional personnel.
Before starting commissioning, the outdoor unit must be power-on for more than 8 hours.
Otherwise, compressor may be damaged.
During daily operation, please keep the outdoor unit power-on at any time.
If unit is power-off for more than 24 hours, it must be preheated for at least 8 hours before
operation.
(2) When unit commissioning is started, the system automatically selects an operation mode
according to the environment temperature:
Cooling mode when the outdoor environment temperature is higher than 20°C
（
68
℉）
.
Heating mode when the outdoor environment temperature is lower than 20°C
（
68
℉）
.
(3) Before starting commissioning, make sure again that stop valves of all basic modules of the
ODU have been completely opened.
(4) During commissioning, the front panel of ODU must be completely covered. Otherwise,
commissioning accuracy may be affected (as shown in the following figure).
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