GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
100
Part 3 Commissioning Process
Note:
! It is forbidden to directly connect the compressor with power supply and forcibly power it on
during commissioning and maintenance.
! Engineering commissioning operations must be performed on the GMV5 serial unit. Otherwise,
the unit cannot properly run.
! Before commissioning is completed, the main board of ODU displays "module address 0F A0"
and that of IDU displays “A0”.
! A module must be set to master module and only one can be set during commissioning.
! An IDU must be set to master IDU and only one can be set during commissioning.
! Other functions can use the factory settings if there are not special engineering requirements.
I. Necessity of VRF Engineering
Commissioning
Different form ordinary air conditioning units, the VRF system raises high design requirements and easily
incurs operation-affected factors such as impurities and water during engineering installation. Due to the
requirements on engineering design/installation complexity and high-precise system control,
commissioning is mandatory after engineering installation. Only a qualified unit can be delivered for use.
II. Required Files and Tools for Engineering
Commissioning
1. Required Tools for Engineering Commissioning of GREE VRF
System high and low pressure gauges
for corresponding refrigerants
The GMV5 VRF provides two commissioning methods. One is to perform commissioning by pressing
buttons on the main board of ODU. The other is to perform commissioning on a PC through professional
software. Parameters of the ODU and IDU can be simultaneously displayed with the second method.
(For details about these methods, refer to respective instructions.)
2. Commissioning Files
The following commissioning files are required to record installation and commissioning of units:
pre-commissioning scheme determination meeting minutes, commissioning personnel record tables,
commissioning system appearance check record tables, commissioning data record tables, and
commissioning reports. See attached tables for file formats.
III. Engineering Commissioning Procedures
Step 1: Pre-commissioning Preparations
1.1 Overall Commissioning Plan
Before commissioning, the person-in-charge should learn about the overall engineering progress plan,
overall workload of engineering commissioning, possible influence factors in achieving the
commissioning progress, and required labors and materials.
1.2 Composition of Commissioning Members
Commissioning members comprise aftersales commissioning personnel and installation personnel.
All commissioning participants must take part in professional training courses before unit commissioning.
All participants can be grouped as required and each group should include at least professional
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