Gree GMV-S280W/A-X

GMV5 Home DC Inverter Multi VRF Units
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3.Preparation before Installation
3.1Notices for Installation Engineering
3.1.1Safety requirements for installation engineering
Warning! 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.
Warning! 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.
3.1.2 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.
When preparing and laying out various pipes onsite, if impurities, water, or dust is still inside
refrigerant pipes or there is impurities and air inside the water system pipeline due to improper
installation, various problems may occur in the system or even lead to system breakdown.
Problems that usually occur during installation are as follows:
No.
Installation Problem
Possible Consequence
1
Dust or impurities enter into the
refrigeration system.
Pipes are blocked; air conditioning performance is reduced;
compressor wear is increased or even hinder the normal
operation of the system and burn the compressor.
2
Nitrogen is not filled into the refrigerant
pipe or insufficient nitrogen is filled
before welding.
Pipes are blocked; air conditioning performance is reduced;
compressor wear is increased or even hinder the normal
operation of the system and burn the compressor.
3
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.
4
Water enters into the refrigeration
pipe.
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.
5
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.
6
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.
7
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.
8
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 refrigerant flows back to the compressor.
9
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.
10
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.
11
The ratio of slop for condensate water
pipe is insufficient or the condensate
water pipe is incorrectly connected.
Reverse slop or inconsistent connection of condensate water
pipe can hinder the smooth drainage and cause leakage of the
IDU.
12
The air channel is improperly fixed.
The air channel will deform; vibration and noise occur during unit
operating.