GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
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Chapter 3 Commissioning Operation
1 Security Requirements
1.1 Precautions for Construction
1. All commissioning and maintenance personnel must learn and strictly comply with construction
security specifications. Security measures must be taken especially for outdoor operations.
2. Workers of special types of labor, such as refrigerating engineers, electricians, and welders, must
have professional certificates. No worker is allowed to do another type of labor.
3. The equipment must be powered off before relevant operations, and other security requirements
should be strictly complied with.
4. All installation and maintenance operations must comply with design requirements of this product
and national and local security operation requirements. Rule-breaking operations are prohibited.
1.2 Precautions for the Use of Refrigerants
The GMV5E serial unit is a refrigerating system of R410A working substances. Pay attention to the
following points:
1. The refrigerating system of R410A working substances has a higher working pressure than that of
R22 working substances. The working pressure of the former is 1.6 times than that of the latter.
2. The refrigerating system of R410A working substances uses thicker-walled copper tubes than
that of R22 working substances. Adopt copper tubes with appropriate wall thickness.
3. R410A working substances are azeotropic mixture working substances. Refrigerants must be
appended in the form of liquid.
2 Introduction to Unit Functions
Function application of ODUs consists of function DIP switch settings and function button settings,
including special engineering requirements.
2.1 System Function DIP Switch Settings
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