GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
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Chapter 3 Commissioning Operation
Part 1 Security Requirements
I. 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.
II. Precautions for the Use of Refrigerants
The GMV5 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.
Part 2 Introduction to Unit Functions
I. Function Settings of ODUs
Function application of ODUs consists of function DIP switch settings and function button settings,
including special engineering requirements.
(I) System Function DIP Switch Settings
Defines the rated capacity of
the unit.
Defined
based on
the model.
The factory settings cannot be
changed.
Centralized
control
address DIP
switch
Defines and differentiates
addresses of different systems
in the case of centralized
control by multiple systems.
The address DIP switch is
used only when centralized
control is required. Otherwise,
the factory settings are used
without being changed. The
address DIP switch is valid
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