GREE DC Inverter Multi VRF System II Service Manual
61
INSTALLATION
1 Engineering Installation Preparation and
Notice
1.1 Installation notice
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.
1.2 Installation key points and importance
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.
Incorrect amount of refrigerant is
filled.
The system cannot correctly control the flow allocation; the compressor may be
operating under over
-heating environment or running when the re
frigerant flows
back to the compressor.
The refrigerant pipe leaks.
Insufficient refrigerant circulating in the system decreases the cooling performance
of the air conditioner. Long
-
term operation under such circumstance may cause an
overheating compressor or even damage the compressor.
Water drainage from the
condensate water pipe is not
smooth.
Residual water in IDUs can affect the normal operation of the system. The
possible water leakage can damage the IDU's decoration.
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