GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
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the unit cannot properly run.
③
Before commissioning is completed, the main board of ODU displays "module address 0F A0"
and that of IDU displays
“A0”.
④
A module must be set to master module and only one can be set during commissioning.
⑤
An IDU must be set to master IDU and only one can be set during commissioning.
⑥
Other functions can use the factory settings if there are not special engineering requirements.
3.1 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.
3.2 Required Files and Tools for Engineering Commissioning
3.2.1 Required Tools for Engineering Commissioning of GREE VRF
Inner hexagon spanner
Digital thermometer
Shifting spanner
Noise meter
Cross screwdriver
Clamp meter
Straight screwdriver
Digital multimeter
Vacuum pump
Electricity meter
Electronic balance
Timer
System high and low pressure gauges for corresponding refrigerants
Step ladder
Wind-speed transmitter
The GMV5E 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.)
3.2.2 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.
3.3 Engineering Commissioning Procedures
3.3.1 Step 1: Pre-commissioning Preparations
3.3.1.1 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.
3.3.1.2 Composition of Commissioning Members
Commissioning members comprise aftersales commissioning personnel and installation personnel.
