GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
21
Chapter 2 Installation
Part 1 Engineering Installation
Preparation
I. Installation Safety
Personnel and property safety are highly concerned during the entire installation process.
Installation implementation must abide by relevant national safety regulations to ensure personnel and
property safety.
All personnel involved in the installation must attend safety education courses and pass
corresponding safety examinations before installation. Only qualified personnel can attend the
installation. Relevant personnel must be held responsible for any violation of the regulation.
II. Importance of Installation Engineering
VRF air conditioning systems use refrigerant, instead of other agent, to directly evaporate to carry
out the system heat. High level of pipe cleanness and dryness is required in the system. Since various
pipes need to be prepared and laid out onsite, carelessness or maloperation during installation may
leave impurities, water, or dust inside refrigerant pipes. If the design fails to meet the requirement,
various problems may occur in the system or even lead to system breakdown.
Problems that usually occur during installation are as follows:
Dust or impurities enter into the
refrigeration system.
Pipes are more likely to be blocked; air conditioning performance is
reduced; compressor wear is increased
or even hinder the normal operation of the system and burn the
compressor.
Nitrogen is not filled into the
refrigerant pipe or insufficient
Nitrogen is filled before welding.
Pipes are more likely to be blocked; air conditioning performance is
reduced; compressor wear is increased
or even hinder the normal operation of the system and burn the
compressor.
The vacuum degree in the refrigerant
pipe is insufficient.
The refrigeration performance is reduced. The system fails to keep
normal operation due to frequent protection measures. When the
problem getting serious, compressor and other major components
can be damaged.
Water enters into the refrigeration
system.
Copper plating may appear on the compressor and reduce the
compressor efficiency with abnormal noise generated; failures may
occur in the system due to ice plug.
The refrigerant pipe specifications do
not meet the configuration
requirements.
Smaller configuration specifications can increase the system pipe
resistance and affect the cooling performance; larger configuration
specifications are waste of materials and can also reduce the cooling
performance.
Refrigerant pipe is blocked.
The cooling performance is reduced; in certain cases,
it may cause long-term compressor operating under overheat
conditions; the lubricating effect can be affected and the
compressor may be burnt if impurities were mixed with the
lubricating oil.
Refrigerant pipe exceeds the limit.
The loss in pipe is considerable and the unit energy efficiency
decreases, which are harmful for long-term running of the system.
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