Are the air outlet and air return vent of IDU connected with soft connectors? Is a plenum
chamber installed for air return?
3.3.3 Step 3: Commissioning Operation
3.3.3.1 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.
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.
Heating mode when the outdoor environment temperature is lower than 20°C.
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).
5) Before commissioning, make sure that appending refrigerants to pipes has finished completely or
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